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ASTM C309 – Standard Specification for Liquid Membrane-Forming Compounds for Curing Concrete


This specification covers liquid membrane-forming compounds suitable for application to concrete surfaces to reduce the loss of water during the early-hardening period.

White-pigmented membrane-forming compounds serve the additional purpose of reducing the temperature rise in concrete exposed to radiation from the sun.

The membrane-forming compounds covered by this specification are suitable for use as curing media for fresh concrete, and may also be used for further curing of concrete after removal of forms or after initial moist curing.


concrete curing; liquid membrane-forming compounds for curing concrete