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Borosilicate GlassThickness 4-12mm Size 3660*2440mm, etc. Description Borosilicate 4.0 fireproof glass has super strong fire resistance, excellent heat shock resistance, no need for homogenization treatment, and low self-explosion rate. Technical parameters Density (at 25℃) : 2.28±0.02g/cm 3 Coefficient of expansion (20-300℃) : 4.0±0.1×10-6 k-1 Softening point: 840℃±5℃ Fire resistance rating: C grade | Class (≥120 minutes) 
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