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A sealant is a type of material, often in the form of a liquid, paste, or compound, that is used to seal gaps, joints, or surfaces to prevent the passage of air, water, dust, contaminants, or other substances. In chemical terms, they are flexible, polymeric materials that provide environmental isolation. They contain fuels, exclude moisture and maintain pressure between two surfaces. Sealants are widely used in various applications to create airtight, watertight, or dustproof seals. Used on aircraft since the 1940s, sealants are inherently resistant to fuel, with excellent resistance to common chemicals and petroleum products in the aerospace industry, as well as UV degradation.
3M's range are a low density sealant solution, are REACH approved, and many carry AMS specifications. They are compatible with PPG Semco equipment, and offer a fast turnaround with their lower tack free and cure time. 3M's sealant range would be mostly applied in integral fuel tanks, fuselage, aerodynamic smoothing and on windows and canopies.