BS680 certificate of test for the acid immersion
--- Most Westone slates comply with BS680 UK standard of roofing slates
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To view Certificate of determination of water absorption and Certificate of test for the wetting and drying test
The serial-number WEI-806 dark grey, WEI-807 grey, WEI-408B black, WEI-408B2 black, WEI-408D rough black, WEI-090 green, WEI-808 green slates comply with BS680 UK standard and ASTM American standard of roofing slates.
WEI-408A charcoal grey slate also is good quality slate with cheapest prices, but it is fading after years, which has been hot sold in UK slate market with economic cost since 1984. It is a little failed for Acid Immersion test, but UK people very like it because cheapest prices.
