Technical Information

Standards:
Thorpestone Architectural Cast Stone is manufactured to BS 1217: 1997.

Cement Efflorescence:
As with all reconstructed stone cement-based products, the temporary phenomenon known as efflorescence is likely to occur. This causes a lightening of colour and is in no way detrimental to the product. This effect reduces over a period of time with natural weathering.

Manufacturing Tolerances:
Dimensional tolerances permitted by BS 1217: 1997

Dimension (mm)	Tolerance (mm)
Up to 600 601 - 1000 1001 - 2500 2501 - 4000 Over 4000	±2 ±3 ±4 ±5 ±6

NB: Normally units of over 1500 in length will be supplied in two or more pieces for ease of handling.

Technical Information

Mean Compression Strength (typical)	>35 N/mm²
Mean Density	2100 Kg/m³
Water Absorption	<1.0 mg/mm2 (Capillary Absorption Tested)
Drying Shrinkage	<0.04%
Thermal Conductivity ’K’	1.40 W/m °C - exposed 1.28 W/m °C - protected
Thermal Resistance ’R’	0.071 m² °C/W - exposed 0.078 m² °C/W- protected

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