OMICRON NP5-P4

OMICRON NP5-P4 is a soda lime glass (Type A) in the form of a white, non-porous, spherical powder with a refractive index of 1.51 (ISO 489/ASTM D542), a specific gravity of 2.5 g/cm³ (ISO 787/10), and a bulk density of 1.51 g/cm³ (ISO 787/11). It contains a silane-type coupling agent, has an oil absorption of 18 g/100g (ISO 787), and a Mohs hardness of 6–6.5. Its softening and annealing points are 730°C and 548°C, respectively.