Quality Requirements for Glazing

Description Items

Quality Requirements

Glazing Grade Domestic(GL)

Thickness

Tolerance

2.0mm

1.80-2.20

3.0mm

2.70-3.00

4.0mm

3.80-4.20

5.0mm

4.70-5.00

6.0mm

5.80-6.20

8-10-12mm

± 0.3

15-19mm

± 0.4

Cross

Bow

2.0-3.0

≤2.0mm/m

4.0-6.0

≤2.0mm/m

8.0-12.0

≤2.0mm/m

15.0-19.0

≤2.0mm/m

Edge

Quality

2.0-6.0

Flake; ≤4mm

Flare/Bevel; ≤3mm

Corners; ≤4mm

8.0-12.0

Flake; ≤6mm

Flare/Bevel; ≤4mm

Corners; ≤6mm

15.0-19.0

Flake; ≤12mm

Flare/Bevel; ≤6mm

Corners; ≤12mm

Over Score &Cutter Drag

None allowed

Size Tolerance

Glass Size

>2000mm

≤2000mm

<3mm

±3mm

± 2mm

3.0-6.0

± 3mm

± 3mm

8.0-12.0

± 4mm

± 4mm

15.0-19.0

± 6mm

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Squareness

For all thicknesses

Diagonal measurement difference/2 = 0.2% of the diagonal length

Linear Flaws

Scratch, Roll Scuff, Roll Mark, Stringer

No flaws visible at 1meter when viewed under normal room light

Non.

Continuous

Defects

Defect Size(d)

No.allowed per square meter

d ≤1.0mm

Allowed

1.0<d ≤1.5mm

Allowed

1.5<d ≤2.0mm

0.5

d>2.0mm

None allowed

Optical

Distortion

2.0-3.0mm

Zebra ≥40 °

4.0-19.0mm

Zebra ≥45 °