![]() The reaction takes place in a matrix formed by the molten binder which is typically based on vinyl acetate copolymers or styrene acrylates.Īblative coatings contain a significant amount of hydrates. ![]() Typically the light char consist of microporous carbonaceous foam formed by a chemical reaction of three main components: ammonium polyphosphate, pentaerythritol tetranitrate, and melamine. These intumescent materials produce a light char which is a poor conductor of heat, thus retarding heat transfer. Intumescent coatings for steel constructions must be approved in standardized fire tests. ![]() The details for individual building parts are specified in technical standards which are compiled and published by national or international standardization bodies like the British Standards Institute (BSI), the German Institute for Standardization (DIN), the American Society for Testing and Materials (ASTM) or the International Organization for Standardization (ISO). Intumescent materials are typically used in passive fire protection and require listing, approval, and compliance in their installed configurations in order to comply with the national building codes and laws. ![]() Intumescence refers to the process of swelling. A charred marshmallow is a familiar example of intumescenceĪn intumescent is a substance that swells as a result of heat exposure, leading to an increase in volume and decrease in density. ![]()
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