D.A.P.
D.A.P. 70798-08642 Silicone Sealant 9.8 oz Cartridge Black
Black silicone sealant in a 9.8 oz cartridge resists mildew, mould and water while staying flexible from -40 to 350 °F and meets ASTM C920 Class 25
- Waterproof seal protects windows and doors
- Flexible bond handles movement without cracking
- Mildew and mold resistance keeps joints clean
- Withstands -40 to 350 °F temperature extremes
- Meets ASTM C920 Class 25 standard
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.
Highlights
- Waterproof seal protects windows and doors
- Flexible bond handles movement without cracking
- Mildew and mold resistance keeps joints clean
- Withstands -40 to 350 °F temperature extremes
- Meets ASTM C920 Class 25 standard
Specifications
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Questions about this item
How does the sealant handle heat and cold once it has cured on an exterior joint?
The cured bead stays flexible from -40 °F up to 350 °F, so daily temperature swings will not cause cracking or loss of adhesion.
What tool is required to apply the 9.8 oz cartridge?
A standard caulking gun that accepts 9.8 oz cartridges is needed to dispense the sealant.
Will this silicone bond to the painted wood trim and vinyl siding I already have?
Yes, it adheres to wood, vinyl, metal and most common building substrates without a primer.
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