The properties of polysulfide sealant and silicone sealant are exactly opposite. Polysulfide sealant is basically not resistant to ultraviolet rays. If polysulfide sealant is exposed to ultraviolet light for a long time, it will age and crack, causing the insulating glass to completely lose its sealing performance.
However, polysulfide sealant has better air tightness than silicone sealant and is also excellent in oil resistance, solvent resistance, water resistance and other properties. Therefore, polysulfide sealant should be used to seal the door and window glass installed in the open frame.
In addition, it is generally believed that the water vapor permeability of polysulfide sealant is only about 30% of that of silicone sealant, and the argon gas permeability is only about 20% of that of silicone sealant. Therefore, polysulfide sealant should also be used for argon-filled glass. It can ensure the performance advantages and service life of insulating Low-E glass.
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