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Siway Sv-119 310ml Cartridge One Part Neutral Curing Firestop Silicone Sealant for Construction Joints. 100% Silicone Composition: Made with pure organic silicone for superior durability and performance. Neutral Curing Technology: One-part neutral cure formula safe for most construction materials. Fireproof & Waterproof: Excellent weatherproofing and waterproofing for firestop applications. High Elasticity: Elongation at break up to 550% for flexible joint sealing. Multi-Color Options: Available in Clear, Black, White, Gray, and other custom colors. ISO Certified Quality: Products comply with ISO9001, ISO14001, and ASTM standards. Free Sample Available: Free silicone sealant samples provided for testing and evaluation.