Composition & Standards
Manufactured in accordance with BS 6073 (UK) and ASTM-C90 Type 1 (American standard).
Concrete Mix
Crushed aggregate and cement
Facing Mix
High purity silica sands and resinous binder permanently bonded on to block in a thermosetting process.
Concrete Block Density
1600kg/m3
Nominal Block Strength
7.3N/mm2
Thermal Conductivity
0.51W/mk
Drying Shrinkage
≤0.03%
Coefficient of Linear Expansion
10.5 x 10-6/K
Dimensional Tolerance
Astra-Glaze is manufactured to ±1.6mm for face dimensions.
Water Absorption
Astra-Glaze is impervious to water penetration. Therefore, when joints are grouted correctly
with waterproof mortar (supplied by others), an impervious wall finish can be achieved. Adequate ventilation should be provided in areas of particularly high humidity.
Specific Heat Capacity
1000 J/Kg/K
Modulus of Elasticity
14.5 x 10³ MN/m²
Fire Resistance
Astra-Glaze is manufactured with a class 1 fire rated aggregate.
The facing material fully complies with and exceeds the strict requirements of ASTM C90 for flame spread and smoke emission.
Cutting
All cutting must be carried out on a bench-mounted clipper saw with a continuous supply of clean
water. The blade should enter the glazed face first. All cut units should be thoroughly washed and allowed to dry before use.
NB: All standard units are provided as hollow unless otherwise displayed in our literature, or agreed with the client/specifier.