POSISEAL PS#2 allows a calculated 2% vapor transmission rate necessary for concrete to breathe. This vapor transmission is necessary for the substrate to survive many freeze/thaw cycles.

• 2允许大约2%25的蒸汽分子的溢出，以满足混凝土的呼吸要求。这种蒸汽分子的溢出对于处于冻融环境中的混凝土非常重要。