GB/T 36259-2018High aluminum silicate cover glass for touch panel (English PDF)

6.5 Curvature

In a batch of glass, take 3 pieces of 356mm × 356mm samples. Determine according to the bending test method specified in GB/T 18680. Take arithmetic mean as results.

6.6 Microscopic waviness

In a batch of glass, take 3 pieces of 200mm × 200mm samples. Determine according to microscopic waviness detection method specified in GB/T 18680. Take arithmetic mean as results.

6.7 Visible light transmittance

On the product glass, take 3 pieces of 50mm × 50mm samples. Test according to the method specified in GB/T 2680. Visible light transmittance measurement results shall take the arithmetic mean.

6.8 Chemical strengthening properties

6.8.1 Sample processing

Processing equipment. stainless steel chemical tempering furnace; heating range. room temperature to 550°C.

Use analytically pure potassium nitrate molten salt, glass with a thickness of not less than 0.3mm and not more than 0.7mm to perform ion exchange treatment at 430°C for 6.5h. For glass with a thickness greater than 0.7mm and not more than 1.10mm, perform ion exchange treatment at 430°C for 7h.

6.8.2 Stress layer depth and surface stress

6.8.2.1 Sample

Take 3 pieces of 100mm × 100mm glass samples produced by chemical strengthening. Wash with distilled water sample before testing, and leave it at room temperature for more than 4h.

6.8.2.2 Test equipment

Use fully automatic surface stress gauge that simultaneously measures surface stress and stress layer depth. Stress measurement circumference. 0MPa ~ 2000MPa, stress measurement accuracy. not less than 20 MPa. Stress layer depth measurement range. 0µm ~ 200µm, stress layer depth test accuracy. not less than 5µm. […]

8.1 Packaging

8.1.1 Glass shall be packed in wooden boxes or containers (racks). Boxes (racks) shall be easy to load, unload and transport. The number of packages per box (rack) shall be compatible with the strength of the box (rack). A box (rack) shall be filled with glass of same thickness, size and grade.

8.1.2 The product packaging site shall be clean and free of flying dust. The glass shall be lined with mildew-proof paper or mildew-proof powder. The paper is flat, smooth and clean, no streaks or pleats. Glass plates shall be kept clean and dry.

8.1.3 The product is packed in plastic cloth and put into a wooden box or other packaging. The plastic cloth shall be placed with a desiccant.

8.2 Marks

The glass packaging shall have a mark or label indicating the product name, manufacturer, registered trademark, site, quality grade, size, thickness, quantity, date of manufacture, direction of drawing and standard number, and printed with "handling with care, fragile, water and moisture proof" in words or marks.

The products produced in float glass process shall indicate tin surface or upper and lower surfaces of glass. […]