| http://www.w3.org/ns/prov#value | - lected from the group consisting of calcium carbonate, calcium sulfate, [clay] alumina, silica and calcium silicate, and (c) O.26% by weight of a hemi-perester of maleic acid having the formula wherein R is a saturated tertiary alkyl radical; pouring the mixture into a container to form a layer, said layer being at least 4 inch thick; and permitting said layer to cure autogenically in air at a tem
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