Standards World

BS EN 902:2009 pdf free download - Chemicals used for treatment of water intended for human consumption一 Hydrogen peroxide. C.1 General principle Arsenious acid, antimonic acid and selenious acid, the As(lll). Sb(lll) and Se(IV) oxidation states of...

BS EN 899:2009 pdf free download - Chemicals used for treatment of water intended for human consumption一 Sulfuric acid. 3.1.3 Relative molecular mass 98. 3.1.4 Empirical formula H2S04. 3.1.5 Chemical formula H2S04. 3.1.6 CAS Registry Number’) 7664-93-9...

BS EN 934-4:2009 pdf free download - Admixtures for concrete, mortar and grout - Part 4: Admixtures for grout for prestressing tendons - Definitions, requirements, conformity, marking and labelling. ZA.1 Clauses of this European Standard addressing the...

BS EN 937:2009 pdf free download - Chemicals used for treatment of water intended for human consumption Chlorine. — T :Toxic N : Dangerous for the environment - nature of special risks: R 23 : Toxic by...

BS EN 938:2009 pdf free download - Chemical ls used for treatment of water intended for human consumption一Sodium chlorite. Dissolve 24,8 g of Na2S2O3.5H20 in water. Add 0,5 ml of chloroform as preservative, dilute to volume with...

BS EN 939:2009 pdf free download - Chemicals used for treatment of water intended for human consumption一 Hydrochloric acid. B.1 Rules for safe handling and use The supplier shall provide current safety instructions. B.2 Emergency procedures B.2.1...

BS-8521:2009 pdf free download - Specification for dual-tone multi-frequency (DTMF) signalling protocol for social alarm systems. 5 Communication 5.1 Session initiation Following completion of call set-up signalling, the local unit and controller shall send an enquiry tone...

BS-7079:2009 pdf free download - General introduction to standards for preparation of steel substrates before application of paints and related products. 3.13 flame cleaning process by which a reducing flame is applied to a surface, followed by...

BS 559:2009 pdf free download - Specification for the design and construction of signs for publicity, decorative and general purposes. 3.1.5 portable sign small self-contained sign which is supplied as a complete unit and is intended to...