1. 1. The shrinkage of the resin should be small, with high transparency, high strength, relatively low viscosity, and no strange color.
2. The particles of glass and other decorative materials should be uniform, free of impurities, variegated colors (except for special effects), and tempered glass.
3. Quartz sand and powder should have high purity, uniform particles, and a hardness of about 7 on the Mohs scale, without associated mica and other miscellaneous minerals (otherwise it will affect the strength). No variegation etc.
4. Additives, no peculiar smell after curing, non-toxic, to achieve satisfactory plate effect. The effect in production is satisfactory.