Physical Properties |
Item |
Instrument |
Standard |
Test Standard |
Pencil Hardness |
Pencil hardness instrument |
≥H |
GB/6739-1996 |
Impact Resistance |
Impact testing instrument |
≥50kg.cm |
GBT/1732-1993 |
Flexing Endurance |
Bending instrument |
≤3mm |
GBT/6742-1986 |
Adhesive Bonding |
Cross-cut testing instrument |
0 Grade |
GBT/9286-1998 |
Bulge |
Bulge instrument |
≥ 7 mm |
GBT/9753-1988 |
Chemical Properties |
Item |
Standard |
Result |
Test Standard |
Resistance to salt spray |
≥500 Hs |
≥9 Grade |
GBT/1771-1991 |
Resistance to heat and humidity |
≥1000 Hs |
Slight loss of gloss |
GBT/1740-1979 |