Description Items
|
Quality Requirements |
Mirror Quality(MQ) |
Select Quality(SQ) |
Thickness
Tolerance |
Nominal Thickness |
Tolerance |
Tolerance |
2.0 |
1.80-2.20 |
1.80-2.20 |
3.0 |
2.70-3.00 |
2.70-3.00 |
4.0 |
3.80-4.20 |
3.80-4.20 |
5.0 |
4.70-5.00 |
4.70-5.00 |
6.0 |
5.80-6.20 |
5.80-6.20 |
8.0 |
------------- |
7.70-8.30 |
10.0 |
------------- |
9.70-10.30 |
12.0 |
------------- |
11.70-12.30 |
Size Tolerance |
Nominal Thickness |
STOCK INVENTORY SHEETS |
CUT SIZE |
2.0-6.0 |
± 3mm |
± 2mm |
8.0-12.0 |
± 6mm |
± 3mm |
Bow & Dish |
2.0-3.0 |
≤1.5mm/m |
4.0-12.0 |
≤1.5mm/m |
| Edge Quality |
Flake |
≤4mm |
≤4mm |
Bevel/Flare |
≤3mm |
≤3mm |
Corner On/Off |
≤4mm |
≤4mm |
Over Score & Cutter Drag |
None allowed |
None allowed |
Squareness |
For all thicknesses |
Diagonal measurement differece/2 ≤0.2% of the diagonal length |
Optical
Distortion |
2.0-3.0mm |
Zebra Reading ≥50 ° |
4.0-12.0mm |
Zebra Reading ≥55° |
Surface Flaws |
Linear
Flaws |
When viewed under a normal fluorescent inspection light source |
Not visible viewed at 0.5 meters |
Not visible viewed at 1.0 meter |
Spot Marks |
Same as for linear flaws |
Same as for point defects |
Point
Defects |
Defect Size(d) |
Number of Defects allowed Per Square Meter of Glass |
d ≤0.5mm |
Allowed |
Allowed |
0.5<d ≤1.0 |
0.3 |
Allowed |
1.0<d ≤1.5 |
0.1 |
0.2 |
d>1.5 |
None |
None |