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Construction SEALANTS – Terminology, purpose, typical applications, Typical Sealed Building Products and Materials What’s the difference between a caulk and a sealant? A caulk is any low or intermediate performance compound. Typically being lower quality and having limited service lives. For example: Acrylic Latex, Butyl, Butyl Rubber, Co-polymers, putty etc. Life cycle: usually 3 – 5 years. A sealant typically refers to a high performance compound having more expensive ingredients, little shrinkage, excellent weathering and UV resistance and providing long service life cycles from 10 – 20 years. Construction Sealants – Terminology ASTM C 920 is t he standard specification for elastomeric joint sealants. It is made up of several ASTM test methods including: – Movement capability (ASTM C 719) – Sealant hardness (ASTM C 661) – Tack free time (ASTM C 679) – Adhesion in Peel (ASTM C 794) Sealant Hardness – ASTM C 661 Is a measure of a...