Glass Surface Quality Standard-Scratch & Dig Standard
Scratch/Dig regards as cosmetic defects found on glass during deep processing. The lower the ratio, the stricter the standard. The specific application determine the quality level and necessary test procedures. Especially, defines the status of polish, area of scratches and digs.
Scratches – A scratch is defined as any linear “tearing” of the surface of the glass. The scratch grade refers to the scratch width and check by visual inspection. The glass material, coating and lighting condition also affect the appearance of a scratch in some degree.
Digs – A dig is defined as a pit or small crater on the surface of the glass. The dig degree represents the actual size of the dig in hundredths of a millimetre and inspected by diameter. The diameter of an irregularly shaped dig is ½ x (Length + Width).
Scratch/Dig Standards Table:
| Scratch/Dig Grade | Scratch Max. Width | Dig Max. Diameter |
| 120/80 | 0.0047” or (0.12mm) | 0.0315” or (0.80mm) |
| 80/50 | 0.0032” or (0.08mm) | 0.0197” or (0.50mm) |
| 60/40 | 0.0024” or (0.06mm) | 0.0157” or (0.40mm) |
- 120/80 is considered as commercial quality standard
- 80/50 is a common acceptable standard for cosmetic standard
- 60/40 is applied on most scientific research applications
- 40/20 is laser quality standard
- 20/10 is optics precision quality standard
Saida Glass is a recognized global glass deep processing supplier of high quality, competitive price and punctual delivery time. With customizing glass in a wide variety of areas and specializing in touch panel, tempered glass, AG/AR/AF glass and indoor & outdoor touch screen.
