Properties of a Good Sealant for Joints

Properties of a good sealant
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A good sealant must be able to be overpainted.
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It should be chemically inert, non-corrosive in nature and provide protection to the underlying surface from environmental and biological effects.
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A good joint sealant should be durable and long-lasting.
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It's co-efficient of volumetric expansion must be less so that it does not expand a lot when exposed to heat.
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A good sealant should have a very good adhesion to most construction materials.
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It should provide air tightness and sound insulation.
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Must be flexible, elastic and of softer grade and not stiff.
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Good wetting behavior
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Must be able to absorb thermal as well as vibrational stresses