D.A.P. 70798-08642 Silicone Sealant 9.8 oz Cartridge Black

Product Identity and Intended Use

D.A.P. 70798-08642 Silicone Sealant comes in a 9.8 oz cartridge and is coloured black for window, door, siding and trim applications. It meets ASTM C920 Class 25 Use G standards and provides a flexible, waterproof bond that resists mildew and mould. This sealant suits professional contractors and DIYers who need a durable exterior joint filler.

Behaviour Under Sustained Load

Once applied the material remains flexible across a service range from -40 Degrees F to 350 Degrees F, so joints absorb thermal cycling without cracking. Full cure completes in one day, after which the seal maintains its waterproof and weather-resistant properties through prolonged exposure to moisture and temperature extremes. It is not suited for structural bonding or constant immersion scenarios.

Practical Limits of the Standard

ASTM C920 Class 25 defines a movement capability of twenty-five percent, so joints wider than the design allowance may exceed the sealant's elongation capacity. The five-minute working time requires efficient tooling before skin formation begins. Surfaces must be clean, dry and compatible with silicone chemistry to achieve the rated performance.