Section 4106. Plastic Film and Insulating Covers for Curing Concrete.
Plastic film and insulating covers shall meet the following requirements for the material specified.
Plastic film used for curing concrete shall be tough, pliable, moisture proof, and sufficiently durable to retain its moisture proof properties while it is in place on the surface of the concrete. The plastic film shall be white pigmented material. The film shall be not less than 0.85 mils (21 Ám) thick, shall have not less than 70% daylight reflectance relative to magnesium oxide when tested in accordance with ASTM E 1347, and shall be opaque. If the thickness of plastic film is less than 3.4 mils (85 Ám), it shall not be used more than once for curing concrete.
Insulating covers for PCC shall be cellulosic fiber sheeting with a nominal 3/4 inch (20 mm) thickness. It shall be similar to that specified in ASTM C 208.