| http://www.w3.org/ns/prov#value | - A retarder for use in well cementing slurries, comprising a mixture of a set retarder and one or more silicates or silica comprising an alkali metal silicate of the general formula (SiO2)x(M2O) having a molar ratio falling in the range 1.68-3.37, wherein M is an alkali metal, the relative amounts of set retarder and silicates or silica are such that the retarding effect of the set retarder under d
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