Dow Chemical Co.
Dow Chemical Co. DOWSIL 99180646 Silicone Sealant 10 oz Cartridge White 737
White silicone sealant in a 10 oz cartridge cures in one day, withstands -75 to 300 °F, and meets UL 94 HB
- High-temperature resistant up to 300 °F for demanding HVAC and electrical sealing
- Flexible 300 % elongation absorbs vibration and thermal movement on metal, glass and concrete
- Low 53 g/L VOC content meets strict indoor air-quality requirements
- UL 94 HB flame rating supports code-compliant duct and enclosure assemblies
- 14-minute working time and 1-day full cure accelerate installation schedules
DOWSIL 99180646 Silicone Sealant 10 oz Cartridge
This DOWSIL silicone sealant comes in a 10 oz cartridge for HVAC, duct and electrical applications. It cures to a flexible bond that withstands temperatures from -75 Degrees F to 300 Degrees F. The white sealant meets UL 94 HB standards and offers 300 percent elongation. It adheres to concrete, fiberglass, glass, masonry, metal, plastic and wood.
Suited for high-temperature sealing on multiple
Professionals sealing HVAC ductwork, electrical enclosures or exterior joints will value the wide temperature range and flexible cure. The 14 minute working time allows precise tooling before skin formation. Buyers needing a paintable sealant or a product approved for potable water contact should look elsewhere. The formula is not designed for structural glazing or continuous water immersion.
Cartridge installs with standard caulking gun
Load the 10 oz cartridge into any standard caulking gun and apply directly to clean, dry surfaces. The sealant skins over in roughly 14 minutes and reaches full cure in 1 day. Common issues include poor adhesion on dusty or oily substrates and overfilling joints beyond the recommended depth. Ensure adequate ventilation during application due to the 53 g/L VOC content.
Highlights
- High-temperature resistant up to 300 °F for demanding HVAC and electrical sealing
- Flexible 300 % elongation absorbs vibration and thermal movement on metal, glass and concrete
- Low 53 g/L VOC content meets strict indoor air-quality requirements
- UL 94 HB flame rating supports code-compliant duct and enclosure assemblies
- 14-minute working time and 1-day full cure accelerate installation schedules
Specifications
| Brand | DOWSIL |
|---|
Questions about this item
What caulking gun size do I need for the 10 oz cartridge?
Use any standard 10 oz cartridge gun; the DOWSIL 99180646 fits the common size used for HVAC and duct sealing.
Will this sealant stay flexible on my existing metal ductwork after it cures?
Yes, the silicone base remains flexible after the 1 day full cure and handles temperatures from -75 to 300 degrees F on metal surfaces.
How can I confirm the bead has cured properly on a glass or plastic surface?
After 1 day at room temperature the sealant reaches full cure; it will feel firm yet rubbery and meet the UL 94 HB rating.
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