Sikaflex -444 Rapid is a one component, polyurethanebased sealant that when mixed with Sikaflex-444 Rapid Booster cures to become a complete bead of rubber that can be opened to vehicular traffic in approximately 4 hours. Sikaflex -444 Rapid will cure without Sikaflex-444 Rapid Booster, but the cure speed will be significantly reduced. Sikaflex -444 Rapid is principally a moisture cured sealant with a semi-self-leveling consistency that can be applied to slopes as great as 20%. Uses include: Ideal for cracks and expansion joints in parking decks, sidewalks and other concrete traffic surfaces. Also intended for use in properly designed, working, nontraffic joints with a minimum depth of 1/4 inch (6 mm). For horizontal applications only with slopes equal to or less than 20%. Adheres to most substrates commonly found in construction. Placeable at temperatures as low as 40 F (4 C). Applicable Standards: Meets ASTM C920 Type S, Grade NS, Class 35, Use T, NT, M, G, A & O, and Federal Specification TT-S-00230C Type II, Class A.