| http://www.w3.org/ns/prov#value | - Optionally, the fibre cement has a composition that includes density modifiers such as: inorganic hollow or foamed microparticles and all other additives as disclosed in WO 01/68547 the entirety of which is incorporated herein by reference; calcium silicate hydrate; entrained air and other suitable density reducing additives, or any combination thereof.
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