- Composition : Silica-sand, soda ash, calcium. - Fusion is obtained at approximately 1550°C. - Physical characteristics:
Density: 2.5 Strength: 10,000 da/Ncm2 under compression Expansion : between +20°C and +220°C = 9 x 10-6
Insulating Glass Blocks
Manufactured by heat fusion at more than 800°C of two hollow half bricks obtained by compression of a glass drop at about 1050°C. These bricks are annealed at 560°C to eliminate internal tensions and containe rarefied air.
- Average value = 2.9W/m2°C : Single Wall
= 1.3W/m2°C : Double Wall
- Between +20°C and 200°C = 9 x 10-6
- 12.0 N/mm - Tested using 50kg sand bag and steel ball bearings (DIN requires 6.8 N/mm)