NORME INTERNATIONALE CEI IEC INTERNATIONAL STANDARD 60544 4 Deuxième édition Second edition 2003 07 Matériaux isolants électriques – Détermination des effets des rayonnements ionisants – Partie 4 Syst[.]
Définition de l'indice de rayonnement
The radiation index should be calculated using the logarithm (base 10, rounded to two significant figures) of the absorbed dose in grays, above which the relevant critical property value meets the specified limit criterion For instance, a material that meets a specific limit criterion up to a certain dose
2 × 10 4 Gy a un indice de rayonnement atteignant 4,3 (c'est-à-dire log 10 (2 × 10 4 ) = 4,301).
Les valeurs doivent être prises dans les séries données dans le Tableau 2.
L'indice de rayonnement doit inclure le dộbit de dose (voir 3.2.1), ou la notation ôvacằ (voir
3.2.2), et doit, en cas de nécessité, inclure des qualificateurs spéciaux tels que la propriété critique (voir 3.3), la température (voir 3.4) et le milieu (voir 4.2.3) Pour une qualification supplémentaire voir Article 4.
According to IEC 60544-2 recommendations, it is advisable to use gamma rays, X-rays, or electrons for irradiation purposes in testing It is essential to specify the type of radiation to which the material has been exposed.
Débit de dose
Depending on the material and irradiation conditions, different radiation indices can be obtained when tests are conducted at varying dose rates in oxygen-containing atmospheres Additionally, the dose rate effects due to diffusion-limited oxidation may vary with the sample thickness Therefore, for irradiation under long-term exposure conditions, these factors must be considered.
According to section 3.6 of IEC 60544-2, the radiation index must be specified with qualifiers that indicate the dose rate and the thickness at which the radiation index was measured For instance, a radiation index of 4.3 (50 Gy/s, 1 mm) should be provided.
In the absence of a reactive medium, such as in a vacuum or an inert gas, it is unnecessary to account for dose rate effects In this scenario, the dose rate qualifier can be substituted with the notation (vac), for instance, radiation index.
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The classification of materials for specific applications is determined by testing their mechanical and electrical properties before and after irradiation, as outlined in IEC 60544-2 Based on these tests, materials receive a "radiation index." To achieve a specific radiation index, a material must meet an endpoint criterion after being irradiated to the designated classification dose under defined conditions.
The end-point criterion may be expressed as an absolute property value or a percentage of the initial value Either method may be used to classify materials for radiation resistance.
Table 1 provides recommendations for properties and percentages of initial values.
All measurements must be conducted after the removal from radiation exposure, unless specified otherwise in the "qualifiers of the radiation index." Additionally, the post-irradiation treatment of test specimens should follow the guidelines outlined in section 3.5 of IEC 60544-2.
The radiation index is calculated using the logarithm (base 10, rounded to two significant figures) of the absorbed dose in grays that meets the end-point criterion under specific conditions For instance, a material that meets a certain end-point criterion at a dose of 2 × 10^4 Gy has a radiation index of 4.3.
(i.e log 10 (2 × 10 4 ) = 4,301) The values shall be taken from the series given in Table 2.
The radiation index must encompass the dose rate or the notation "vac," along with any relevant qualifiers such as critical property, temperature, and medium For additional qualifications, refer to Clause 4.
According to IEC 60544-2 guidelines, it is advisable to utilize gamma-rays, X-rays, or electrons for test irradiation, and it is essential to specify the type of radiation to which the material has been exposed.
The radiation index can vary based on the material and irradiation conditions, particularly when tests are conducted at different dose rates in oxygen-rich environments Additionally, dose rate effects may arise due to diffusion-limited oxidation.
The radiation index as per IEC 61244-1 is influenced by the thickness of the sample Consequently, when assessing long-term exposure conditions, it is essential to provide qualifiers that specify both the dose rate and the sample thickness used to determine the radiation index, as outlined in section 3.6 of IEC 60544-2.
For example: radiation index 4,3 (50 Gy/s, 1 mm).
In a vacuum or inert gas, the dose-rate effect is not a concern, allowing the dose rate qualifier to be denoted as (vac) For instance, this can be represented as a radiation index of 4.3 (vac).
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In the presence of oxygen, certain polymers may undergo decomposition due to reactive states induced by radiation This reaction is influenced by the amount of oxygen that diffuses into the material, which is affected by the polymer's permeability to gaseous oxygen, the thickness of the sample, and the rate of oxygen consumption (refer to IEC 61244-1) Additionally, the effects of radiation dose rate are commonly observed in this context.
Si une dépendance du débit de dose n'a pas été exclue lors d'expériences antérieures, il faut faire les essais le plus près possible du débit de dose rencontré en service.
For air irradiation, the dose rate and sample thickness specified in section 3.2.1 indicate that the radiation index is applicable for this dose rate or a higher one, as well as for this thickness.
3.2.4 Si le temps d'irradiation requis est excessif, il est recommandé de déterminer l'effet du débit de dose par l'une des méthodes données dans la CEI 61244-2.
Propriétés critiques
For standard applications, the most critical property is the flexural strength under maximum load for rigid plastics, while the elongation at break percentage is essential for flexible plastics and elastomers Unless stated otherwise, the radiation index must consider the application of limit point criteria related to these properties, which does not necessarily indicate a end-of-life condition.
3.3.2 Si l'application l'exige, l'utilisateur peut spécifier une autre propriété prise dans le
Tableau 1 pour déterminer l'indice de rayonnement Dans ces conditions, la propriété mise à l'essai doit être spécifiée.
Températures
3.4.1 Pour déterminer l'indice de rayonnement, la température normale des essais doit être la température ambiante (23 ± 5) °C.
3.4.2 Le service, à des températures élevées, ajoute un facteur supplémentaire à l'estima- tion de la durée de vie utile des matériaux dans des environnements sous rayonnement.
Each material reacts differently to high temperatures, generally experiencing accelerated degradation of properties However, some materials can have a longer lifespan under specific combinations of temperature and dose rate It is crucial to consider each parameter and the essential property governing service life when determining the radiation index, as degradation reaction rates vary with temperature The relative significance of these rates may depend on the physical state of the polymer at a given temperature Notably, the ratio of these rates can change dramatically at the glass transition temperature or other transition temperatures, leading to varying property changes influenced by irradiation temperature for each material.
If the operating temperature differs from the ambient temperature, the material must also be tested at one of the nearest standardized temperatures specified in IEC 60212, in accordance with section 3.4.2 of IEC 60544-2.
Autres considérations
3.5.1 Les changements se produisant dans les propriétés sont typiquement non linéaires à la dose Par conséquent, l’extrapolation des valeurs de la dose correspondant aux critères de point limite est déconseillée.
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In the presence of oxygen, decomposition reactions can occur in some polymers due to radiation-induced reactive states This phenomenon is influenced by the diffusion of oxygen into the material, which is affected by the polymer's permeability to gaseous oxygen, the sample's thickness, and the rate of oxygen consumption Additionally, a radiation dose-rate effect is often observed in these scenarios, as outlined in IEC 61244-1.
If a dose-rate dependence has not been excluded by prior experiments, it is necessary to test as closely as possible to the service dose rate.
For irradiation in air, the dose rate and sample thickness according to 3.2.1 means that the radiation index is valid for this dose rate or higher and for this thickness.
3.2.4 If the required radiation time is excessive, it is recommended that the dose-rate effect be estimated by one of the procedures given in IEC 61244-2.
In typical applications, the critical property for rigid plastics is the flexural stress at maximum load, while for flexible plastics and elastomers, it is the percentage elongation at break Unless specified otherwise, the radiation index will apply the end-point criteria linked to these properties, which does not necessarily indicate an end-of-life condition.
If necessary, the user can select a different property from Table 1 to calculate the radiation index, and in such cases, the specific property tested must be clearly indicated.
3.4.1 The normal test temperature for determining the radiation index shall be room temperature (23 ± 5) °C.
Service at elevated temperatures significantly influences the estimation of materials' useful lifetime in radiation environments Different materials respond uniquely to these conditions, but generally, they exhibit accelerated deterioration of their properties when exposed to higher temperatures.
Certain materials exhibit extended service life under specific combinations of temperature and dose rate When assessing the radiation index, it is crucial to consider each parameter and the key properties that influence longevity, as degradation rates are temperature-dependent The significance of these rates can vary based on the polymer's physical state at a given temperature, with notable shifts occurring at the glass transition temperature and other transition points Consequently, the impact of irradiation temperature on material properties differs for each type of polymer.
If the service temperature is other than room temperature, the material shall also be tested at one of the closest standardized temperatures given in IEC 60212 and following 3.4.2 of
3.5.1 The changes in properties are typically not linear with dose Therefore, extrapolation of the values of dose to the end-point criteria is not advisable.
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3.5.2 Les valeurs initiales des propriétés du matériau non irradié doivent être indiquées.
L'indice de rayonnement des différents polymères donne une indication quant à leur résistance aux rayonnements, en comparaison avec la valeur de leurs propriétés initiales.
An approximate estimation of the service life can be derived from the environmental dose rate and the dose corresponding to the radiation index when the required properties for the application can be linked to a limit criterion However, significant dose rate effects may considerably reduce the actual service life compared to this initial estimate (refer to IEC 60544-1 and IEC 60544-2).
The determined radiation index is only applicable to the specific material tested, as variations in chemical composition (including fillers and additives), physical structure, and manufacturing methods can lead to differences in how radiation affects properties Therefore, it is not appropriate to classify a material solely based on its chemical type if another material of the same type has been classified through testing.
Le matériau connexe peut généralement entrer dans la même catégorie de résistance aux rayonnements que le matériau spécifique qui a été mis à l'essai sous certaines conditions.
For instance, if the variant is an additive that does not alter the effects of radiation, and if the concentration difference is within 10% of the weight of the element used in the compound, then this is considered acceptable.
4 Désignation de l'indice de rayonnement et qualificateurs pour services particuliers
Indice de rayonnement
The radiation index from Table 2 indicates a material suitable for specified dose rates and thicknesses in air, as detailed in section 3.2.1 Additionally, it can be applied to any dose rate in the absence of a reactive medium, as discussed in section 3.2.2, at ambient temperature, referenced in section 3.4.1 Furthermore, the radiation index was established through testing.
– la résistance à la flexion sous charge maximale des plastiques rigides, ou
– l'allongement à la rupture des plastiques souples et élastomères, conformément à 3.3.1 et aux critères de point limite appropriés du Tableau 1.
Indice de rayonnement avec qualificateur
When assessing a material's radiation endurance using a critical property not mentioned in section 4.1, it is essential to append a qualifier related to the tested property to the radiation index (refer to section 3.3.2).
4.2.2 Pour les applications à une température autre que la température ambiante, un qualificateur doit être ajouté à l'indice de rayonnement Il donnera la température maximale de service (voir 3.4.2).
4.2.3 Dans le cas d'un milieu réactif autre que l'air, un qualificateur doit être ajouté à l'indice de rayonnement pour spécifier le milieu.
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The original properties of unirradiated materials must be clearly stated, as the radiation index of specific polymers indicates their resistance to radiation relative to these original values An approximate service lifetime can be estimated based on the dose rate of the service environment and the radiation index, provided that the property requirements align with an end-point criterion However, significant dose rate effects may considerably shorten the actual service lifetime compared to this initial estimate.
The radiation index determined through testing is specific to the material tested, as variations in chemical composition, physical structure, and fabrication methods can lead to different radiation-induced property changes Consequently, it is inappropriate to classify a material solely based on its chemical type if it has not undergone the same testing as another classified material.
The related material may generally be assigned to the same category of radiation resistance as that determined for the specified material that has been tested under certain conditions.
If the additive variant is not expected to influence the radiation effect and the mass concentration difference is within 10% of the component used in the compound, it is considered acceptable.
4 Designation of radiation index and special service qualifiers
The radiation index value from Table 2 indicates the suitability of a material for specific dose rates and thicknesses in air or in a vacuum at any dose rate, all at room temperature This index is established through rigorous testing.
– flexural stress at maximum load for rigid plastics, or
– elongation at break for flexible plastics and elastomers, in accordance with 3.3.1 and the appropriate end-point criteria of Table 1.
When assessing the radiation endurance of a material using a critical property different from that specified in section 4.1, it is essential to include the tested property as a qualifier in the radiation index, as outlined in section 3.3.2.
4.2.2 For application at other than room temperature, a qualifier shall be added to the radiation index indicating the maximum service temperature (see 3.4.2).
4.2.3 In the case of a reactive medium other than air, this specific medium shall be added to the radiation index as a qualifier.
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Definition of radiation index
The radiation index is calculated using the logarithm (base 10, rounded to two significant figures) of the absorbed dose in grays that meets the end-point criterion under specific conditions For instance, a material that meets a certain end-point criterion at a dose of \$2 \times 10^4\$ Gy has a radiation index of 4.3.
(i.e log 10 (2 × 10 4 ) = 4,301) The values shall be taken from the series given in Table 2.
The radiation index must encompass the dose rate or the notation "vac," along with any relevant special qualifiers, including critical properties, temperature, and the medium For additional qualifications, refer to Clause 4.
According to IEC 60544-2 guidelines, it is advisable to utilize gamma-rays, X-rays, or electrons for test irradiation, and it is essential to specify the type of radiation to which the material has been exposed.
Dose rate
The radiation index can vary based on the material and irradiation conditions, particularly when tests are conducted at different dose rates in oxygen-rich environments Additionally, dose rate effects are influenced by diffusion-limited oxidation.
The radiation index in IEC 61244-1 is influenced by the thickness of the sample Consequently, when assessing long-term exposure conditions as outlined in section 3.6 of IEC 60544-2, it is essential to provide qualifiers that specify both the dose rate and the sample thickness used to determine the radiation index.
For example: radiation index 4,3 (50 Gy/s, 1 mm).
In a vacuum or inert gas, the dose-rate effect is not a concern, allowing the dose rate qualifier to be denoted as (vac) For instance, this can be represented as a radiation index of 4.3 (vac).
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In the presence of oxygen, certain polymers may undergo decomposition due to reactive states induced by radiation This reaction is influenced by the amount of oxygen that diffuses into the material, which is affected by the polymer's permeability to gaseous oxygen, the thickness of the sample, and the rate of oxygen consumption (refer to IEC 61244-1) Additionally, the effects of radiation dose rate are commonly observed in this context.
Si une dépendance du débit de dose n'a pas été exclue lors d'expériences antérieures, il faut faire les essais le plus près possible du débit de dose rencontré en service.
For air irradiation, the dose rate and sample thickness specified in section 3.2.1 indicate that the radiation index is applicable for this dose rate or a higher one, as well as for the given thickness.
3.2.4 Si le temps d'irradiation requis est excessif, il est recommandé de déterminer l'effet du débit de dose par l'une des méthodes données dans la CEI 61244-2.
For standard applications, the most critical property is the flexural strength under maximum load for rigid plastics, while the elongation at break percentage is essential for flexible plastics and elastomers Unless stated otherwise, the radiation index must consider the application of limit point criteria related to these properties, which does not necessarily indicate a end-of-life condition.
3.3.2 Si l'application l'exige, l'utilisateur peut spécifier une autre propriété prise dans le
Tableau 1 pour déterminer l'indice de rayonnement Dans ces conditions, la propriété mise à l'essai doit être spécifiée.
3.4.1 Pour déterminer l'indice de rayonnement, la température normale des essais doit être la température ambiante (23 ± 5) °C.
3.4.2 Le service, à des températures élevées, ajoute un facteur supplémentaire à l'estima- tion de la durée de vie utile des matériaux dans des environnements sous rayonnement.
Each material is affected differently by high temperatures, generally exhibiting accelerated degradation of properties However, some materials can have a longer lifespan under specific combinations of temperature and dose rate It is essential to consider each parameter and the key property governing service life when determining the radiation index, as degradation reaction rates vary with temperature The relative significance of these rates may depend on the physical state of the polymer at a given temperature Notably, the ratio of these rates can change abruptly at the glass transition temperature or other transition temperatures, leading to varying property changes influenced by the irradiation temperature for each material.
If the operating temperature differs from the ambient temperature, the material must also be tested at one of the nearest standardized temperatures specified in IEC 60212, in accordance with section 3.4.2 of IEC 60544-2.
3.5.1 Les changements se produisant dans les propriétés sont typiquement non linéaires à la dose Par conséquent, l’extrapolation des valeurs de la dose correspondant aux critères de point limite est déconseillée.
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In the presence of oxygen, decomposition reactions can occur in some polymers due to radiation-induced reactive states This phenomenon is influenced by the diffusion of oxygen into the material, which is affected by the polymer's permeability to gaseous oxygen, the sample's thickness, and the rate of oxygen consumption Additionally, a radiation dose-rate effect is often observed in these scenarios, as outlined in IEC 61244-1.
If a dose-rate dependence has not been excluded by prior experiments, it is necessary to test as closely as possible to the service dose rate.
For irradiation in air, the dose rate and sample thickness according to 3.2.1 means that the radiation index is valid for this dose rate or higher and for this thickness.
3.2.4 If the required radiation time is excessive, it is recommended that the dose-rate effect be estimated by one of the procedures given in IEC 61244-2.
Critical properties
In typical applications, the critical property for rigid plastics is the flexural stress at maximum load, while for flexible plastics and elastomers, it is the percentage elongation at break Unless specified otherwise, the radiation index will apply the end-point criteria linked to these properties, which does not necessarily indicate a condition at the end of the material's life.
If necessary, the user can select a different property from Table 1 to calculate the radiation index, and in such cases, the specific property tested must be clearly stated.
Temperatures
3.4.1 The normal test temperature for determining the radiation index shall be room temperature (23 ± 5) °C.
Service at elevated temperatures significantly influences the estimation of materials' useful lifetime in radiation environments Different materials respond uniquely to these conditions, but generally, they exhibit accelerated deterioration of their properties when exposed to higher temperatures.
Certain materials exhibit extended service life under specific combinations of temperature and dose rate When assessing the radiation index, it is crucial to consider each parameter and the key properties that influence longevity, as degradation rates are temperature-dependent The significance of these rates can vary based on the polymer's physical state at a given temperature Notably, the ratio of degradation rates can shift dramatically at the glass transition temperature and other transition points, leading to property changes that are uniquely affected by irradiation temperature for each material.
If the service temperature is other than room temperature, the material shall also be tested at one of the closest standardized temperatures given in IEC 60212 and following 3.4.2 of
Additional considerations
3.5.1 The changes in properties are typically not linear with dose Therefore, extrapolation of the values of dose to the end-point criteria is not advisable.
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3.5.2 Les valeurs initiales des propriétés du matériau non irradié doivent être indiquées.
L'indice de rayonnement des différents polymères donne une indication quant à leur résistance aux rayonnements, en comparaison avec la valeur de leurs propriétés initiales.
An approximate estimation of the service life can be derived from the environmental dose rate and the dose corresponding to the radiation index when the required properties for the application can be linked to a limit criterion However, significant dose rate effects may considerably reduce the actual service life compared to this initial estimate (refer to IEC 60544-1 and IEC 60544-2).
The determined radiation index is only applicable to the specific material tested, as variations in chemical composition, including fillers and additives, physical structure, and manufacturing methods can lead to differences in how radiation affects properties Therefore, it is not appropriate to classify a material solely based on its chemical type if another material of the same type has been classified through testing.
Le matériau connexe peut généralement entrer dans la même catégorie de résistance aux rayonnements que le matériau spécifique qui a été mis à l'essai sous certaines conditions.
For instance, if the variant is an additive that does not alter the effects of radiation, and if the concentration difference is within 10% of the weight of the element used in the compound, then this is considered acceptable.
4 Désignation de l'indice de rayonnement et qualificateurs pour services particuliers
The radiation index from Table 2 indicates a material suitable for specified dose rates and thicknesses in air, as detailed in section 3.2.1 Additionally, it can be applied to any dose rate in the absence of a reactive medium, as discussed in section 3.2.2, at ambient temperature (refer to section 3.4.1) Furthermore, the radiation index was established through testing.
– la résistance à la flexion sous charge maximale des plastiques rigides, ou
– l'allongement à la rupture des plastiques souples et élastomères, conformément à 3.3.1 et aux critères de point limite appropriés du Tableau 1.
4.2 Indice de rayonnement avec qualificateur
When assessing a material's radiation endurance using a critical property not specified in section 4.1, it is essential to append a qualifier related to the tested property to the radiation index (refer to section 3.3.2).
4.2.2 Pour les applications à une température autre que la température ambiante, un qualificateur doit être ajouté à l'indice de rayonnement Il donnera la température maximale de service (voir 3.4.2).
4.2.3 Dans le cas d'un milieu réactif autre que l'air, un qualificateur doit être ajouté à l'indice de rayonnement pour spécifier le milieu.
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The original properties of unirradiated materials must be clearly stated, as the radiation index of specific polymers indicates their resistance to radiation relative to these original values By correlating the dose rate of the service environment with the radiation index, one can approximate the service lifetime, provided that the property requirements align with an end-point criterion However, significant dose rate effects may considerably shorten the actual service lifetime compared to initial estimates.
The radiation index determined through testing is specific to the material tested, as variations in chemical composition, physical structure, and fabrication methods can lead to different radiation-induced property changes Consequently, it is inappropriate to classify a material solely based on its chemical type if it has not undergone similar testing as another classified material.
The related material may generally be assigned to the same category of radiation resistance as that determined for the specified material that has been tested under certain conditions.
If the additive variant is not expected to influence the radiation effect and the mass concentration difference is within 10% of the component used in the compound, it is considered acceptable.
4 Designation of radiation index and special service qualifiers
Radiation index
The radiation index value from Table 2 indicates the suitability of a material for specific dose rates and thicknesses in air, or under “vac” conditions without a reactive medium, at room temperature This index is established through rigorous testing.
– flexural stress at maximum load for rigid plastics, or
– elongation at break for flexible plastics and elastomers, in accordance with 3.3.1 and the appropriate end-point criteria of Table 1.
Radiation index with qualifications
When assessing the radiation endurance of a material using a critical property different from that specified in section 4.1, it is essential to include the tested property as a qualifier in the radiation index.
4.2.2 For application at other than room temperature, a qualifier shall be added to the radiation index indicating the maximum service temperature (see 3.4.2).
4.2.3 In the case of a reactive medium other than air, this specific medium shall be added to the radiation index as a qualifier.
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Voici trois exemples de l'utilisation de cette classification et du barème des indices:
• l'appellation ôPVC, type XY, indice de rayonnement 6,0 (50 Gy/s, 1 mm)ằ
This designation indicates that PVC type XY, with a thickness of 1 mm or less, retains a 50% elongation at break of its initial value after being irradiated to an absorbed dose of 1 × 10^6 Gy at 23 °C and a dose rate of 50 Gy/s or higher in air.
• l'appellation ôrộsine ộpoxyde, type XY, indice de rayonnement 7,0 (vac, rộsistance d'isolement)ằ
The term refers to epoxy resin type XY, which retains 10% of its initial strength after being irradiated to an absorbed dose of 1 × 10^7 Gy at an ambient temperature of (23 ± 5) °C in a vacuum.
• l'appellation ôcaoutchouc de silicone, type XY, indice de rayonnement 5,3 (0,1 Gy/s,
The term refers to silicone rubber, type XY, with a thickness of 1 mm or less, which maintains a surface resistivity of at least 0.1 times its initial value after being irradiated to an absorbed dose of 2 × 10^5 Gy at a specified service temperature.
80 °C ou moins et à des débits de dose de 0,1 Gy/s ou plus dans l’air.
Tableau 1 – Propriétés critiques et critères de point limite à considérer dans l'évaluation de la classification des matériaux isolants placés dans des environnements sous rayonnement
Type de matériaux Propriétés à mettre à l'essai Méthodes d'essai Critères de point limite a
Contrainte de traction au seuil d'écoulement ISO 527 50 % Contrainte de traction à la rupture ISO 527 50 %
Résistivité transversale et superficielle CEI 60093 10 %
Contrainte de traction au seuil d'écoulement ISO 527 50 % Contrainte de traction à la rupture ISO 527 50 %
Résistivité transversale et superficielle CEI 60093 10 %
Contrainte de traction à la rupture ISO 37 50 %
Dureté D.I.D.C ISO 48 Changement de 10 unités
Dureté Shore A ISO 868 Changement de 10 unités
Déformation rémanente après compression ISO 815 50 % Résistivité transversale et superficielle CEI 60093 10 %
Rigidité diélectrique CEI 60243 50 % a Les valeurs données en pourcentage sont exprimées en pourcentage de la valeur initiale
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Examples
Three examples of the use of this classification and index scheme are given below:
• designation “PVC, Type XY, radiation index 6,0 (50 Gy/s, 1 mm)”
The PVC, Type XY, with a thickness of 1 mm or less, has achieved 50% of its initial elongation at break after being irradiated with an absorbed dose of 1 × 10^6 Gy at 23 °C and a dose rate of 50 Gy/s or higher in air.
• designation “epoxy resin, Type XY, radiation index 7,0 (vac, insulation resistance)”
The epoxy resin, Type XY, has achieved an insulation resistance of 10% of its initial value after being irradiated with an absorbed dose of 1 × 10^7 Gy at room temperature (23 ± 5) °C in a vacuum.
• designation “silicon rubber, Type XY, radiation index 5,3 (0,1 Gy/s, 1 mm, surface resistivity, 80 °C)”
This designation means that the silicon rubber, Type XY, of thickness less than or equal to
A material with a thickness of 1 mm retains a surface resistivity of at least 0.1 times its initial value after being irradiated with an absorbed dose of up to 2 × 10^5 Gy This stability is observed at service temperatures of 80 °C and below, and at dose rates of 0.1 Gy/s and higher in air.
Table 1 – Critical properties and end-point criteria to be considered in evaluating the classification of insulating materials in radiation environments
Type of material Properties to be tested Test procedures End-point criteria a
Tensile strength at yield ISO 527 50 %
Tensile strength at break ISO 527 50 %
Volume and surface resistivity IEC 60093 10 %
Tensile strength at yield ISO 527 50 %
Flexible plastics Tensile strength at break ISO 527 50 %
Volume and surface resistivity IEC 60093 10 %
Tensile strength at break ISO 37 50 %
Hardness/IRHD ISO 48 Change of 10 units
Hardness/Shore A ISO 868 Change of 10 units
Volume and surface resistivity IEC 60093 10 %
Electric strength IEC 60243 50 % a The values given in per cent are expressed as a percentage of the initial value.
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Tableau 2 – Dose absorbée correspondant à l'indice de rayonnement
Indice de rayonnement Dose absorbée (Gy) maximale satisfaisant aux critères de point limite
NOTE Pour les qualificateurs de l'indice de rayonnement, voir 4.2.
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Table 2 – Values for radiation index
Radiation index values Absorbed dose (Gy) up to which the end-point criteria are satisfied
NOTE For radiation index qualifiers, see 4.2.
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CEI 60093, Méthodes pour la mesure de la résistivité transversale et de la résistivité superficielle des matériaux isolants électriques solides
CEI 60167, Méthodes d'essai pour la détermination de la résistance d'isolement des isolants solides
CEI 60243 (toutes les parties), Rigidité diélectrique des matériaux isolants − Méthodes d’essai
ISO 37, Caoutchouc vulcanisé ou thermoplastique − Détermination des caractéristiques de contrainte-déformation en traction
ISO 48, Caoutchouc vulcanisé ou thermoplastique − Détermination de la dureté (dureté comprise entre 10 DIDC et 100 DIDC)
ISO 178, Plastiques − Détermination des propriétés en flexion
ISO 179 (toutes les parties), Plastiques − Détermination des caractéristiques au choc Charpy
ISO 527 (toutes les parties), Plastiques − Détermination des propriétés en traction
ISO 815, Caoutchouc vulcanisé ou thermoplastique − Détermination de la déformation rémanente après compression aux températures ambiantes, élevées ou basses
ISO 868, Plastiques et ébonite − Détermination de la dureté par pénétration au moyen d'un duromètre (dureté Shore)
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IEC 60093, Methods of test for volume resistivity and surface resistivity of solid electrical insulating materials
IEC 60167, Methods of test for the determination of the insulation resistance of solid insulating materials
IEC 60243 (all parts), Electrical strength of insulating materials – Test methods
ISO 37, Rubber, vulcanized or thermoplastic – Determination of tensile stress-strain properties
ISO 48, Rubber, vulcanized or thermoplastic – Determination of hardness (hardness between
ISO 178, Plastics – Determination of flexural properties
ISO 179 (all parts), Plastics – Determination of Charpy impact properties
ISO 527 (all parts), Plastics – Determination of tensile properties
ISO 815, Rubber, vulcanized or thermoplastic – Determination of compression set at ambient, elevated or low temperatures
ISO 868, Plastics and ebonite – Determination of indentation hardness by means of a duro- meter (Shore hardness)
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