POSISEAL PS#1 allows entrapped water vapors to escape because the vapor molecule is significantly smaller. This vapor transmission is necessary if the substrate is to survive many freeze/thaw cycles.

• 1允许蒸汽分子的溢出，因为蒸汽分子十分细小。如果混凝土处于冻融环境中，则蒸汽分子的溢出非常必要。