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BS EN 771-5-2003 pdf download.Specification for masonry units Part 5 : Manufactured stone masonry units. When manufactured stone masonry units are intended to be used with thin layer mortar, the manufacturer shall declare the maximum deviation from...

BS EN 771-6-2005 pdf download.Specification for masonry units Part 6 : Natural stone masonry units. 5.5 Apparent density The manufacturer shall declare the apparent density of six specimens sampled in accordance with Annex A and tested in...