Dimension Stone Freeze Thawing chiefly occuring in the colder place near the north.After stone pores absorbing enough water,the stone moisture begins to freeze,the volume then expands.When ice expadation is greater than stone structure,stone will produce fragmentation.And this is called freeze thawing.Generally speaking, the matter is abide by the "heat bilges cold shrink" law, while water is just the opposite.Due to the main factors of freeze-thaw is water, we just stop moisture from entering stone can prevent freeze-thaw. So, we'll just completes the protective processing line by using stone conservation agent.