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Sealants for Construction - Part II Technical Characteristics of Sealants

SpecialChem / Philippe Cognard – Mar 17, 2004

Before we study the different types of construction sealants and their formulation, we must explain what are their technical characteristics and properties. A sealant when it is delivered in the original packaging (cartridges or sometimes drums) is a paste. This paste is applied into the gap between 2 parts of the construction, then it must be leveled, then it will dry or cure at ambient temperature and it will become a plastic or elastomeric joint having the required properties: gap filling, elasticity, adhesion to the substrates, water resistance, etc… We will study these properties in the chronological order as they appear on site during the installation. Characteristics of use: Temperature and humidity during application: Construction Sealants are applied on site, at various temperature, according to the climate and the time of the year. Most sealants will not cure properly if the outside temperature is too cold (less than 5 to 10°C) and they will dry or set to fast if the temperature is too high (more than 40°C).

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