Iec 61249 2 33 2009

Materials for printed boards and other interconnecting structures – Part 2-33: Reinforced base materials, clad and unclad – Non-halogenated modified or unmodified resin system, woven E-

Resin system

The resin system is non-halogenated, modified multifunctional epoxide, or modified epoxide, with a glass transition temperature of the laminate sheet of 150 °C minimum

The maximum total halogens contained in the resin plus reinforcement matrix is 1 500 ppm with a maximum chlorine of 900 ppm and maximum bromine being 900 ppm

LICENSED TO MECON Limited - RANCHI/BANGALORE FOR INTERNAL USE AT THIS LOCATION ONLY, SUPPLIED BY BOOK SUPPLY BUREAU.

Contrast agents may be added to assist processing such as automated optical inspection (AOI)

The resin system should be modified to satisfy the electrical properties requirement of Clause 5

The flame resistance of the materials is defined in terms of the flammability requirements of

Metal foil

The metal foil, specified in IEC 61249-5-1, is composed of copper and is essential for the production of copper-clad materials The ideal choice for these foils is electro-deposited copper, which possesses defined ductility.

Reinforcement

The reinforcement of the laminate shall be woven E-glass fabric (for the manufacture of prepreg and copper clad materials) A woven E-glass fabric exhibiting lower relative permittivity may be utilized

The electrical property requirements are given in Table 1

Resistance of foil 2E12 As specified in IEC 61249-5-1

Surface resistance after damp heat while in the humidity chamber

Surface resistance after damp heat and recovery

Volume resistivity after damp heat while in the humidity chamber

Volume resistivity after damp heat and recovery

Relative permittivity after damp heat and recovery (1 MHz)

Dissipation factor after damp heat and recovery (1 MHz)

Relative permittivity at high frequency

Dissipation factor at high frequency

Electric strength (only for material thickness less than 0,5 mm )

Dielectric breakdown (only for material thicknesses ≥ 0,5 mm)

6 Non-electrical properties of the copper-clad laminate

Appearance of the copper-clad sheet

Indentations (pits and dents)

The size of an indentation, usually the length, shall be determined and given a point value to be used as measure of the quality

Size mm Point value for each indentation

The total point count for any 300 mm × 300 mm area laminate shall be calculated to determine the class of the material

Class X To be agreed upon by user and supplier

The required class of material shall be specified in the purchase order Class A applies unless otherwise specified.

Wrinkles

There shall be no wrinkles in the copper surface.

Scratches

Scratches deeper than 20 % of the nominal thickness of the foil thickness are not allowed

Scratches with a depth less than 5 % of the nominal thickness of the foil shall not be counted unless this depth is 10 μm or more

Scratches with a depth between 5 % and 20 % of the nominal thickness of the foil are permitted to a total length of 100 mm for a 300 mm × 300 mm area.

Raised areas

Raised areas are usually impressions in the press plates used during manufacture but may also be caused by blisters or inclusions of foreign particles under the foil

Raised areas caused by blisters or inclusions are not allowed

Raised areas being impressions of defects in press plates are permitted to the following extent:

Class A and X material Maximum height of 15 μm and maximum length of 15 mm;

Class B and C material Maximum height of 8 μm and maximum length of 15 mm;

Class D material Maximum height of 5 μm and maximum length of 15 mm.

Surface waviness

When examined in accordance with test method 2M12 of IEC 61189-2, the surface waviness in both the machine and cross machine direction shall not exceed 7 μm.

Appearance of the unclad face

The unclad surface of a single side clad sheet will exhibit a natural look from the curing process, with minor color irregularities permitted The glossiness of this surface is determined by the press plate or release foil utilized, and variations in gloss caused by gas pressure during curing are acceptable.

Laminate thickness

When ordering laminate thickness, it can be specified to include or exclude the copper foil contribution Typically, laminates under 0.8 mm are measured without copper, while those 0.8 mm or thicker include it According to test method 2D01 of IEC 61189-2, the thickness of copper-clad laminates must not deviate from the nominal thickness by more than the values listed in Table 2, with fine tolerances applying unless otherwise specified.

Table 2 – Nominal thickness and tolerance of metal-clad laminate

Nominal thickness excluding metal foil (material intended for multilayer boards) mm

Nominal thickness including metal foil (material intended for single or double sided boards) l mm Coarse Fine Extra fine

The thickness and tolerances do not apply to the outer 25 mm of the trimmed master sheet or the outer 13 mm of the cut-to-size panel provided by the supplier Additionally, the thickness must not deviate from the nominal by more than 125% of the specified tolerance.

Bow and twist

When the copper-clad laminate is tested in accordance with test method 2M01 of IEC 61189-2, the bow and twist shall not exceed the values given in Table 3

Panel dimension longest side mm Copper foil on one side

Copper foil on both sides

The bow and twist requirements are applicable solely to one-sided copper-clad laminates with a maximum foil thickness of 105 μm (915 g/m²) and to double-sided copper-clad laminates that have a maximum foil thickness difference.

Requirements for laminates with copper foil configurations beyond these limits are subject to agreement between purchaser and supplier

Properties related to the copper foil bond

Table 4 outlines the pull-off and peel strength requirements for copper foil with a standard profile depth For low or very low profile copper foil, the minimum strength requirements must be at least 50% of the values specified in Table 4.

Table 4 – Pull-off and peel strength

Thickness of the copper foil

Peel strength after heat shock of 20 s

In situations where foil breakage or limited reading range of the force measuring device occurs, it is advisable to measure peel strength at elevated temperatures using conductor widths greater than 3 mm.

Punching and machining

Punching is not allowed; instead, the laminate must be sheared or drilled as per the manufacturer's guidelines Delamination at the edges from shearing is acceptable, provided it does not exceed the thickness of the base material However, delamination around drilled holes is not permitted, and drilled holes must be suitable for through-plating without any obstruction from exudations.

Dimensional stability

The dimensional stability requirements are given in Table 5 When specimens are tested in accordance with IEC 61189-2 2X02 the observed tolerance shall be as specified in Table 5

The nominal dimensional stability value shall be as agreed upon between user and supplier

The tolerance range agreed upon between user and supplier shall be class A, unless otherwise specified on the purchase order

The selection of glass fabrics plays a crucial role in ensuring the dimensional stability of laminates For detailed examples of standard constructions utilized in printed board applications, please refer to Annex B.

Class A performance shall be in effect unless othewise noted on the purchase order

X As agreed upon between user and supplier

Sheet sizes

Typical sheet sizes

Sheet size is a subject of agreement between user and supplier However, the recommended sizes are listed below:

Tolerances for sheet sizes

The size of sheet delivered by the supplier shall not deviate more than

+ 20 mm from the ordered size.

Cut panels

Cut panel sizes

Cut panel sizes shall be, when delivered, in accordance with the purchaser’s specification given by the purchaser.

Size tolerances for cut panels

For custom-sized panels, the tolerances for length and width will adhere to the specifications outlined in Table 6 Normal tolerances will apply unless the purchaser specifies otherwise in their purchasing specifications.

Table 6 – Size tolerances for cut panel

NOTE The specified tolerances include all deviations caused by cutting the panels.

Rectangularity of cut panels

For custom-sized panels, the rectangularity requirements outlined in Table 7 must be adhered to The standard tolerances will apply unless the purchasing specification states otherwise.

Table 7 – Rectangularity of cut panel

7 Non-electrical properties of the base material after complete removal of the copper foil

Appearance of the dielectric base material

The etched specimen must be examined to ensure that surface and subsurface imperfections in the dielectric material do not exceed specified limits This inspection should be conducted using optical aid equipment that offers a minimum magnification of 4X.

Referee inspection shall be conducted at 10X magnification Lighting conditions of inspection shall be appropriate to the material under inspection or as agreed upon between user and supplier

Surface and subsurface imperfections (such as weave texture, resin starvation, voids, foreign inclusions) shall be acceptable provided that the imperfections meet the following:

• the reinforcement fibres are not cut or exposed;

• the foreign inclusions are not conductive;

• the imperfections do not propagate as a result of thermal stress;

• the foreign inclusions are translucent;

• opaque foreign fibres are less than 15 mm in length and an average number of no more than 1,0 per 300 mm × 300 mm area;

Opaque foreign inclusions, excluding fibers, must not exceed 0.50 mm in size, while those smaller than 0.15 mm are not counted Additionally, the permissible number of opaque foreign inclusions ranging from 0.15 mm to 0.50 mm is limited to a maximum of two spots per 300 mm × 300 mm area.

• voids (sealed voids or surface void) have a longest dimension less than 0,075 mm and there should not be more than three voids in a 3,5 mm diameter circle.

Flexural strength

When the laminate is tested in accordance with test method 2M20 of IEC 61189-2, the flexural strength shall be as given in Table 8

Cross direction (applicable to sheets ≥ 1,0 mm in thickness)

≥ 250 N/mm 2 Not specified Flexural strength

Elevated temperature (applicable to sheets ≥ 1,0 mm in thickness)

Flammability

When the laminate is tested in accordance with test method 2C08 (thickness ≥0,05 mm

≤0,3 mm) or 2C06 (thickness >0,3 mm ≤3,2 mm) of IEC 61189-2, the flammability shall be as given in Table 9

The performance class of V-0 shall be in effect unless otherwise stated in noted on the purchase order

Flaming combustion time after each application of the flame for each test specimen

Total flaming combustion time for the 10 flame applications for each set of five specimens

Glowing combustion time after the second removal of the test flame

Flaming or glowing combustion up to the holding clamp

Dripping flaming particles that ignite the tissue paper

Water absorption

When the laminate is tested in accordance with test method 2N02 of IEC 61189-2, the maximum water absorption shall be as given in Table 10

Measling

When the laminate is tested in accordance with test method 2N01 of IEC 61189-2, the presence of measles allowed shall be as given in Table 11

Measling 2N01 No measling on three specimens If one out of three specimens fails, the test has to be repeated

No measling on three specimens of the second test is permitted

No blistering or delamination on any of the three specimens is permitted

Glass transition temperature and cure factor

The requirements for glass transition temperature and cure factor are found in Table 12

Table 12 – Glass transition temperature and cure factor

Quality system

The supplier shall maintain a quality system in compliance with ISO 9000 or similar to support quality conformance inspection

The supplier shall maintain a management system for environmental control in compliance with

ISO 14001 or similar, to support environmental considerations.

Responsibility for inspection

The supplier is responsible for all inspections of the manufactured material The purchaser or an appointed third party may audit these inspections.

Qualification inspection

Laminates produced according to this standard must undergo qualification testing to verify the manufacturer's compliance with the specification requirements This testing will be carried out in a laboratory that adheres to the necessary compliance standards.

IEC laboratory requirements A list of the normal qualification tests can be found in Annex C

The manufacturer shall retain on file the data which supports that the materials meet this standard and shall be readily available for review upon request.

Quality conformance inspection

The supplier is required to implement a quality plan to ensure product compliance with the standard, preferably using statistical methods instead of lot-by-lot inspections It is the supplier's responsibility to establish the testing frequency based on the quality plan to guarantee product conformity If a quality plan or supporting data is not available, the testing procedures must follow the guidelines specified in Annex C.

To demonstrate compliance with the requirements and potentially reduce testing frequency, a combination of specific techniques may be employed Data justifying the reduced testing frequency will be available for review upon request.

Certificate of conformance

The supplier shall, on request from the purchaser, issue a certificate of conformance in electronic or paper format.

Safety data sheet

A safety data sheet in accordance with ISO 11014-1 shall be available for products manufactured and delivered in compliance with this standard

Laminate sheets must be clearly marked with the manufacturer's designation and lot number unless specified otherwise in the purchase order The markings should remain legible during normal handling and be easily removable before the material is used.

Cut-to-size panels shall be identified by marking/labelling on the package

Laminates comprised of asymmetric copper configurations shall be marked on the side of heaviest copper weight

Sheets and panels shall be packaged in a manner which will provide adequate protection against corrosion, deterioration and physical damages during shipment and storage

The package shall be marked in a manner to clearly identify the content

When placing an order, it is essential to include specific details such as a reference to the applicable standard, the type of material, and the size, thickness, and copper cladding Additionally, specify the class of indentation, raised area, thickness tolerance, dimensional stability, panel size tolerance, and flammability if they differ from the standard classifications Lastly, if certification is required, it should be explicitly requested.

This annex provides guidelines for design and engineering purposes but does not specify material property requirements Users are encouraged to contribute information for inclusion in the annex.

Materials according to this standard show the properties and data as listed in Clause A.2 to

• Hardness at room temperature 200 (Rockwell M)

• Modulus of elasticity, flexural (warp) 1,9 × 104 N/mm 2

• Modulus of elasticity, flexural (weft) 1,5 × 104 N/mm 2

• Modulus of elasticity, tensile (warp) 1,7 × 104 N/mm 2

• Modulus of elasticity, tensile (weft) 1,4 × 104 N/mm 2

• Coefficient of thermal expansion (

Tiêu đề	Materials for Printed Boards and Other Interconnection Structures – Part 2-33: Reinforced Base Materials, Clad and Unclad
Trường học	International Electrotechnical Commission
Chuyên ngành	Electrical and Electronic Technologies
Thể loại	international standard
Năm xuất bản	2009
Thành phố	Geneva

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Số trang	46
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