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Imperial Blue
Chinese Roofing Slate |
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| Imperial Blue slate have been tested and fully comply
to BS 680: Part 2: 1971 clause 6.2. standard. (Test date 16/12/03.) |
| The Imperial Blue slates are 6 - 8 mm in thickness
and pre-holed. |
| The slates are from a very hard rock, and are also classed as a weathering slate. The slates are delivered in secure
wooden crates, with the amount and crate number printed on the crates. |
We can have up to 4% breakage in the crates due to
transport and shipping anything in excess of this amount will be replaced
free of charge. |
| The slates come in various sizes please ring for more
details. |
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| Testing |
There are several international standards against
which
natural slate can be tested. |
In the UK, the standard for roofing slate is the
BS 680
Part 2: 1971. This standard requires that slate meets with the accepted
levels of three basic criteria - acid resistance, wetting and drying
cycles and water absorption. |
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| BS 680 Pt II 6.2.1 |
Water Absorption |
- 0.27% |
| BS 680 Pt II 6.2.2 |
Wetting & Drying |
- PASS |
| BS 680 Pt II 6.2.3 |
Acid Immersion |
- PASS |
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| Size (mm) |
Size (inches) |
Thickness (mm) |
| 400 x 250 mm |
Approx 16’’ x 10’’’ |
6 - 8 mm |
| 500 x 250 mm |
Approx 20’’ x 10’’ |
6 - 8 mm |
| 500 x 300 mm |
Approx 20’’ x 12’’ |
6 - 8 mm |
| 600 x 300 mm |
Approx 24’’ x 12’’ |
6 - 8 mm |
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