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Sealant Adhesion Promoter 3-Aminopropyltrimethoxysilane CAS. 13822-56-5. Superior Adhesion Performance: Excellent adhesion promoter for RTV silicones, hybrid sealants, and difficult substrates like ABC, PVC, and Polystyrene. High Purity Options: Available in 97% minimum and 98% minimum purity levels verified by Gas Chromatography. Versatile Application: Ideal for use in primer systems for hybrid and polyurethane sealants. Flexible Packaging: Available in 200kg iron drums or 1000kg IBC containers to suit different volume needs.