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Standard Specifications for Liquid Membrane Forming Curing Compounds and Curing and Sealing Compounds.
The most common concrete curing specification in use today. States that the compound must form a membrane and have moisture retention properties equalling 0.55 Kg/M2 in 72 hours when applied at 200 Ft.2 per gallon. Compounds are classified according to type and class.
If a curing compound is said to be Class B, it is also considered to be an A.