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The refractive index of aluminosilicate glass filler matches that of bisGMA and is very close to our X-970-0000. It has a negative coefficient of thermal expansion, which means it contracts slightly upon heating. This glass contains no barium and therefore has no x-ray opacity making it ideal to blend with our other glass fillers. CAS # 65997-17-3. 
Unit of Measure

Typical Properties


N/A E 1000

Median Particle Size (Microns)

N/A 10.4

Coefficient of Thermal Expansion

N/A -2.3 ppm/ºC

Index of Refraction

N/A 1.540


N/A 2.50 g/mL

CAS Registration Number

N/A 65997-17-3


Silicon Dioxide

N/A 71.0 %

Aluminum Trioxide

N/A 20.0 %