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A liquid silicone rubber sealant, DTD900/4721 is valued for being easier to work with than other two- part rubber sealants. DTD900/4721 comes as a pourable liquid; it cures at room temperature. An advantage DTD9004721 has over other rubber sealants is that it can weather temperatures between - 60Ã‚Â°C to 250Ã‚Â°C while maintaining its flexibility. It can even withstand 300Ã‚Â°C for short periods. Additionally, DTD9004721 resists oxidation with many oils and chemicals.