Seal substrates with high flexibility using air curing sealants As opposed to chemical-curing sealants such as high modulus sealants, low modulus mastic sealants rely on air to cure them thus they're known mainly for external sealing work. Low modulus mastic sealants are a specific type of sealant designed to have high elasticity and flexibility. The term "modulus" in this context refers to the stiffness or rigidity of the material. Low modulus mastic sealants are specifically formulated to maintain their flexibility when fully cured, making them the correct choice of sealant for applications on the outside of builidings where moderate to excessive movement, ...
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