STARPHIRE Ultra-Clear™ Soda Lime Glass

Glass Type: Soda lime


STARPHIRE Ultra-Clear™ glass is an ultra-clear soda lime float glass product. Its high visible light transmittance (>91 % at 6 mm) and its brilliant azure edge are two characteristics unique to STARPHIRE Ultra-Clear™ glass. This glass is a low iron composition with mechanical and physical properties similar to ordinary clear soda lime float glass.

Thermal PropertiesMechanical Properties
Thermal Coefficient of Expansion(0/300°C): 32.5 X 10 -7/°CDensity2.51 g/cm3 (at 20°C/68°F)
Annealing Point547°C /1017° FKnoop Hardness448 kg/m m2
Softening Point710°C /1310° FYoung’s Modulus73.1 Gpa
Strain Point513°C/ 955° FPoisson’s Ratio0.22
Chemical Properties
Hydrolytic ResistanceClass 3Dielectric ConstantE=5.7 MHz @R.T.
Acid ResistanceN/AResistivity106 -108 ohms/sq.@R.T.
Alkali ResistanceN/ADielectric Strength0.5 KV/mm
Optical Properties
Refractive Index1.5183 (589.3 nm)