NORME EUROPÉENNE English Version Glass in building - Basic soda-lime silicate glass products - Part 8: Supplied and final cut sizes Verre dans la construction - Produits verriers de si
Manufacturing dimensions
Supplied sizes
Supplied sizes cover glass delivered in the sizes given in Table 1
Table 1 — Dimensions of supplied sizes
< 1 650 New antique drawn sheet glass;
Drawn sheet glass for renovation
< 1 380 a Under exceptional production requirements, B may be less than 3 210 mm but never below 3 150 mm In such cases, supplied sizes are those with B < 3 150 mm.
Final cut sizes
Final cut sizes cover glass delivered in the final dimensions
The minimum final cut size shall have dimensions H or B not less than 100 mm and a minimum surface area of not less than 0,05 m².
Thickness
General
The thickness of the glass will be determined by averaging four measurements, each taken to the nearest 0.01 mm, with one measurement at the center of each side Measurements can be conducted using either a calliper micrometer type instrument suitable for float glass, polished wired glass, and drawn sheet glass, or a plate gauge type instrument with a diameter of (50 ± 5) mm, which is appropriate for patterned glass and wired patterned glass.
Tolerances
The actual thickness, rounded to the nearest 0,1 mm shall not vary from the nominal thickness by more than the tolerances shown in Tables 2 and 3
Table 2 — Nominal thicknesses, limits and tolerances for float glass, polished wired glass, patterned glass and wired patterned glass
Thickness limits and tolerances on thickness
Float glass Polished wired glass Patterned glass Wired patterned glass
Table 3 — Nominal thicknesses, and thickness tolerances for new antique drawn sheet glass, drawn sheet glass for renovation and drawn sheet glass
Tolerance on thickness New antique drawn sheet glass Drawn sheet glass for renovation Drawn sheet glass
Length, width, and squareness
Tolerances on the nominal dimensions of length (H) and width (B) for various types of glass are specified in the respective tables: Table 4 for float glass and drawn sheet glass, Table 5 for polished wired glass and wired patterned glass, and Table 6 for patterned glass.
Table 4 — Tolerance, t , on the nominal dimensions length and width —
Float glass and drawn sheet glass
Supplied size Final cut sizes
Table 5 — Tolerance, t , on the nominal dimensions length and width —
Polished wired glass and wired patterned glass
Glass type Nominal glass thickness, d Tolerance t
Supplied sizes Final cut sizes
Table 6 — Tolerance, t , on the nominal dimensions length and width — Patterned glass
Supplied sizes Final cut sizes
The squareness limits are defined by the differences between the diagonals, with specific values provided in Table 7 for float glass, Table 8 for drawn sheet glass, Table 9 for polished wired glass and wired patterned glass, and Table 10 for patterned glass.
Table 7 — Limit on the difference between diagonals for float glass
Limit on the difference between diagonals Supplied and final cut sizes ( H , B ) ≤ 1 500 1 500 < ( H , B ) ≤ 3 000 ( H , B ) > 3 000
Table 8 — Limit on the difference between diagonals for antique drawn sheet glass, drawn sheet glass for renovation and drawn sheet glass
Limit on the difference between diagonals Supplied and final cut sizes ( H , B ) ≤ 1 500 1 500 < ( H , B ) ≤ 3 000 ( H , B ) > 3 000
Table 9 — Limit on the difference between diagonals for polished wired glass and wired patterned glass
Glass type Nominal glass thickness, d
Limit on the difference between diagonals Supplied and final cut sizes ( H , B ) ≤ 1 500 1 500 < ( H , B ) ≤ 3 000 ( H , B ) > 3 000
Table 10 — Limit on the difference between diagonals for patterned glass
Limit on the difference between diagonals Supplied and final cut sizes ( H , B ) ≤ 1 500 1 500 < ( H , B ) ≤ 3 000 ( H , B ) > 3 000
General
One quality level is considered for each product in this European Standard
The quality of the following products is determined by evaluation of the optical and visual faults: a) float glass; b) polished wired glass; c) drawn sheet glass
The quality assessment of the following products relies solely on the evaluation of visual defects: new antique drawn sheet glass, drawn sheet glass for renovation, patterned glass, and wired patterned glass.
For final cut sizes, the quality of the cut edge is considered
Optical faults in glass, as outlined in EN 572-2:2012, EN 572-3:2012, and EN 572-4:2012, are assessed based on the dimensions of the manufactured glass Visual inspections for these faults can be conducted on all dimensions, including both supplied and final cut sizes, with acceptance levels varying according to the specific dimensions.
Methods of observation and measurement
Optical faults
The methods of measurement/determination are specified in the appropriate parts of EN 572 (Parts 2,
3, 4) and will therefore not be detailed in this European Standard
For float glass, the critical viewing angle is measured For polished wired glass and drawn sheet glass, the presence of disturbing distortions is noted.
Visual faults
The methods of examination for spot faults are given for the various glass products in Annex A These methods are identical to and copied from the appropriate parts of EN 572
The examination methods for linear and extended faults in various glass products are detailed in Annex A and are directly derived from the relevant sections of EN 572.
A reference line or straight edge is positioned on the glass, as illustrated in Figure 3, to measure the deviation, denoted as \(x\), of the pattern in relation to this reference The potential deviations include being out of square, exhibiting waviness, or displaying bowing.
NOTE The scale of these drawings has been exaggerated in order to be explicit about the types of deviation
Figure 3 — Representations of the type of pattern faults
A reference line is positioned parallel to the wires, and the deviation, denoted as \( y \), is measured in relation to this reference.
Any penetration of the glass surface by the wire is noted
Any breaks in the wire are noted a) Out of square b) Waviness c) Bow
NOTE The scale of these drawings has been exaggerated in order to be explicit about the types of deviation
Figure 4 — Representations of the types of wire faults
Edge defects for final cut sizes
Entrant and emergent faults are shown in Figures 5 and 6 The dimensions h 1, h 2 and p and the glass thickness e are measured
Figure 5 — Entrant and emergent faults — Surface view
Figure 6 — Entrant faults — Edge view
The bevel fault is shown in Figure 7 The dimension d and the glass thickness, e, are measured
Acceptance levels
Optical faults
For float glass, when examined by the method in EN 572-2:2012, the critical viewing angle, a, shall be greater than 50°
For polished wired glass and drawn sheet glass, when examined by the methods in EN 572-3:2012 and
EN 572-4:2012 respectively, the observer shall not see any disturbing distortions within the glass pane.
Visual faults
The acceptance levels for various products and fault types, including spot faults, linear/extended faults, patterned faults, wire faults, and edge defects, are determined in accordance with sections 6.2.2.1 to 6.2.3.
— 6.3.2.2 for spot faults for supplied sizes;
— 6.3.2.3 for spot faults for final cut sizes;
— 6.3.2.4 for linear/extended faults for supplied sizes;
— 6.3.2.5 for linear/extended faults for final cut sizes;
— 6.3.2.8 for edge defects for final cut sizes
6.3.2.2Spot faults for supplied sizes
The allowable levels of spot faults, in supplied sizes, are dependent on the specific product type and are detailed below
The allowable numbers for each of the categories of faults (see Table A.1), are shown in Table 11
Table 11 — Acceptance levels for spot faults in supplied sizes of float glass
Category of fault Surface area of pane ( S )
D Not allowed a The minimum distance between category B faults shall be not less than 500 mm
The acceptance levels for each size/position of spot faults in polished wired glass are shown in Table 12
Table 12 — Acceptance levels for spot faults in supplied sizes of polished wired glass
Type of fault Position relative to wire
Acceptance levels for faults of various larger dimensions
≤ 2 mm from wire Acceptable 0,5 per m² Not acceptable
> 2 mm from wire Acceptable 0,5 per m² Not acceptable
Type of fault Width of fault
Acceptance level for faults of various lengths
≤ 1,0 mm Accepted ≤ 10 per m² ≤ 3 per m² ≤ 2 per m² Not accepted
Table 13 presents the permissible numbers for each size of spot fault in new antique drawn sheet glass and drawn sheet glass used for renovation, while Table 14 outlines the allowable numbers specifically for drawn sheet glass.
Table 13 — Acceptance levels for spot faults and linear/extended faults in new antique drawn sheet glass and drawn sheet glass for renovation
Types of faults Acceptance criteria
Acceptable 2/m² Not acceptable 1.2 Solid spot faults
Table 14 — Acceptance levels for spot and linear/extended faults in supplied sizes of drawn sheet glass
Types of faults Acceptance criteria
1.2 Gaseous inclusions > 1 mm acceptable if
1.4 Other spot faults ≤ 1 mm 1 per m²
1.5 Remark concerning all spot faults In the case of a single fault per m², the maximum dimension may be increased by 25 %
6.3.2.2.5 Patterned glass and wired patterned glass
The allowable numbers for each size/position of spot faults are shown in Table 15
Table 15 — Acceptance levels for spot faults in supplied sizes of patterned glass and wired patterned glass
Type of fault Acceptance levels for faults of various larger dimensions
Spherical and quasi-spherical Acceptable 2 per m² Not accepted
Type of fault Width of fault
Acceptance level for faults of various lengths
≤ 2,0 mm Accepted Sum of lengths
6.3.2.3Spot faults for final cut sizes
The allowable levels of spot faults, in final cut sizes, are dependent on the specific product type and are detailed below
The allowable numbers for each of the categories of faults (see Table A.1), are shown in Table 16
Table 16 — Acceptance levels for spot faults in final cut sizes of float glass
Category of fault Surface area of pane ( S )
D Not allowed a The minimum distance between category B faults shall be not less than 500 mm
The allowable numbers for each size/position of spot faults are shown in Table 17
Table 17 — Acceptance levels for spot faults in final cut sizes of polished wired glass
Type of fault Position relative to wire
Acceptance levels for faults of various larger dimensions
≤ 2 mm from wire Acceptable 0,5 per m² Not acceptable
> 2 mm from wire Acceptable 0,5 per m² Not acceptable
Type of fault Width of fault
Acceptance level for faults of various lengths
≤ 1,0 mm Accepted ≤ 8 per m² ≤ 2 per m² ≤ 2 per m² Not accepted
Tables 13 and 14 present the permissible quantities for various sizes of spot and linear/extended faults in new antique drawn sheet glass, as well as in drawn sheet glass intended for renovation.
6.3.2.3.5 Patterned glass and wired patterned glass
The allowable numbers for each size/position of spot faults are shown in Table 18
Table 18 — Acceptance levels for spot faults in final cut sizes of patterned glass and wired patterned glass
Type of fault Acceptance levels for faults of various larger dimensions
Spherical and quasi-spherical Acceptable 2 per m² Not accepted
Type of fault Width of fault
Acceptance level for faults of various lengths
Elongated spot faults ≤ 2,0 mm Accepted Sum of lengths
6.3.2.4Linear/extended faults for supplied sizes
When examined by the method in Annex A, the level of allowable linear/extended faults is an average of 0,05 faults per 20 m²
6.3.2.5 Linear/extended faults for final cut sizes
When examined by the method in Annex A, no linear/extended faults are allowed
The deviation of the pattern, x, (see Figure 3) shall not exceed 12 mm per metre
The deviation of the wire, y, (see Figure 4) shall not exceed 15 mm per metre
NOTE The deformation of the wires of each square of the mesh is not considered
No penetration of the surface is permitted
A break in the wire is acceptable only if it does not affect vision in a disturbing manner under the conditions of observation (see Annex A)
6.3.2.8 Edge defects for final cut sizes
The limitations on entrant and emergent faults and bevel are given in Table 19
Table 19 — Limitations on edge defects
Emergent fault h 2 must not surpass the positive tolerance t specified in Tables 2 and 3, which varies based on the type of glass product Additionally, the pane should stay within the rectangle defined by the nominal dimensions H and B, including the positive tolerance.
Bevel The ratio (d/e) shall be less than 0,25
Limitations are relevant only in the absence of thermal stress breakage risks In scenarios where such risks exist, it is essential to adhere to the manufacturers' guidelines regarding edge quality.
Test methods of examination for visual faults — Spot faults and linear/extended faults
Float glass (EN 572-2:2012)
Method of observation
A spot fault typically features a nucleus surrounded by a halo The classification of spot faults is based on their maximum dimension, as outlined in Annex B.
The analysis of spot faults involves noting the quantity of these faults and the maximum size of the halo produced by the nucleus, which can be categorized into four distinct types as outlined in Table A.1.
Table A.1 — Categories of spot faults
Category Dimension of spot fault
Linear/extended faults
The glass pane to be examined is illuminated in conditions approximating to diffuse daylight and is observed in front of a matt black screen (reflection coefficient between 0,2 and 0,4)
Position the glass pane vertically in front of the screen and ensure it is parallel to it Maintain a distance of 2 meters from the glass for observation, with the line of sight perpendicular to the glass surface.
View the pane of glass, and note the presence of visually disturbing faults.
Polished wired glass (EN 572-3:2012)
Spot faults
Spot faults are often linked to the wire due to its integration within the glass These faults can be categorized based on their connection to the wire.
— distance from the wire > 2 mm;
— distance from the wire ≤ 2 mm, or in contact with the wire
Measure the dimensions of the faults using a micrometer that has graduations in tenths of a millimeter Record the number, dimensions, and concentration of the spot faults, along with their relationship to the wire.
Linear/extended faults
The glass pane to be examined is illuminated in conditions approximating to diffuse daylight and is observed in front of a matt black screen
Position the glass pane vertically in front of the screen and ensure it is parallel to it Maintain a distance of 2 meters from the glass for observation, with the line of sight perpendicular to the glass surface.
View the pane of glass, and note the presence of visually disturbing faults.
Drawn sheet glass (EN 572-4:2012)
Spot faults
Measure the largest dimension (diameter or length) of these faults with a micrometer with graduations in tenths of a millimetre
Note the number, dimensions and concentration of spot faults.
Linear/extended faults
The glass pane to be examined is illuminated in conditions approximating to diffuse daylight and is observed in front of a matt grey screen
Position the glass pane vertically in front of the screen and ensure it is parallel to it Maintain a distance of 2 meters from the glass for observation, with the line of sight perpendicular to the glass surface.
View the pane of glass, and note the presence of visually disturbing faults.
Patterned glass (EN 572-5:2012) and wired patterned glass (EN 572-6:2012) — Spot
— Spot and linear/extended faults
The glass pane to be examined is illuminated in conditions approximating to diffuse daylight and is observed in front of a matt grey screen
Position the glass pane vertically, 3 meters in front of the screen, and ensure the observation point is 1.5 meters away from the glass, with the line of sight perpendicular to the glass surface.
Examine the glass pane for visually disturbing defects, including spot faults and linear/extended faults For spot faults, measure their dimensions using a micrometer with tenths of a millimeter graduations, and record the number, size, and concentration of these faults Additionally, count the number of linear or extended faults present.
Method for measuring spot fault size (including halo)
Conditions of observation
The method for measuring the spot fault size including halo is based on the projection technique, using a point source projector and a screen (see Figure B.1)
A projector with a lamp of the type OSRAM HBO 200 W 1) is placed at (4 650 ± 100) mm from the projection screen
The glass or sample containing the spot fault is placed at (600 ± 100) mm of a projection screen, in the light beam of the projector
The sample is maintained parallel to the screen The spot fault image (core and deformation) appears on the screen
3 glass sample with spot fault
Figure B.1 — Method of observation of the sample
The OSRAM Lamp HBO 200 W is a product offered by OSRAM, and this mention is intended for user convenience within this European Standard It is important to note that this does not imply any endorsement by CEN of the specified product Users may opt for equivalent products, provided they can demonstrate comparable results.
Measurement of the size of the spot fault including the halo
Position a distortion gauge, which is a transparent plastic sheet featuring circular black spots of varying diameters from 0.6 mm to 9.0 mm (refer to Figure B.2), on the glass surface where the spot fault is identified.
Search the circular spot covering the defect which conduct to the elimination of the spot fault image on the screen
Figure B.2 — Example of distortion gauge with printed black spots
The spot fault size including halo is the diameter of this circular black spot
NOTE 1 For greater accuracy, a calliper could be used instead of the plastic distortion gauge
NOTE 2 Any other method that is better or equivalent may be used
[1] EN 572-7, Glass in building — Basic soda lime silicate glass products — Part 7: Wired or unwired channel shaped glass