Dow Corning
Dow Corning DOWSIL 99180561 Silicone Sealant 10 oz Cartridge White
A mildew- and mould-resistant white silicone sealant for HVAC, duct and electrical use, meeting FDA 21 CFR 177.2600, NSF 51, NSF 61 and UL 94 HB standards
- Food-grade sealant meets FDA 21 CFR 177.2600, NSF 51 and NSF 61 standards
- Mildew- and mould-resistant formula protects HVAC, duct and electrical joints
- Flexible silicone handles movement with 350 % elongation at full cure
- Wide service range from -67 °F to 350 °F suits extreme environments
- UL 94 HB rating confirms flame-retardant performance for safety-critical installs
What it is and who it is for
DOWSIL 99180561 is a white silicone sealant supplied in a 10 oz cartridge. It is formulated for HVAC, duct and electrical applications and meets FDA 21 CFR 177.2600, NSF 51, NSF 61 and UL 94 HB standards. The product is mildew resistant, mold resistant, flexible and food grade, making it suitable for professionals who need a compliant sealant for these specific uses. It is not for buyers who require a different container format or a sealant without these certifications.
The specification that decides fit
The decisive factor is the combination of certifications: FDA 21 CFR 177.2600 for food contact, NSF 51 and NSF 61 for water system components, and UL 94 HB for flammability. If your project demands one or more of these exact approvals, this cartridge matches; if your specification calls for a different standard or a higher temperature limit, this is not the correct product.
Installation and common issues
Apply with a standard caulking gun; the working time is 30 minutes before skinning begins. Full cure requires 7 days, during which the joint must remain undisturbed. The service range spans -67 °F to 350 °F. Common problems arise when the sealant is stressed before full cure or when surfaces are not clean and dry, leading to adhesion loss.
Highlights
- Food-grade sealant meets FDA 21 CFR 177.2600, NSF 51 and NSF 61 standards
- Mildew- and mould-resistant formula protects HVAC, duct and electrical joints
- Flexible silicone handles movement with 350 % elongation at full cure
- Wide service range from -67 °F to 350 °F suits extreme environments
- UL 94 HB rating confirms flame-retardant performance for safety-critical installs
Specifications
| Brand | DOWSIL |
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Questions about this item
What does the 350-percent elongation mean once the sealant is cured in a joint?
It means the cured bead can stretch to 3.5 times its original length before breaking, so normal building movement or vibration will not open the seal.
Which standards does the FDA 21 CFR 177.2600 and NSF 51/61 listing actually permit for food-zone and potable-water contact?
FDA 21 CFR 177.2600 clears it for repeated food contact, while NSF 51 and NSF 61 certify it for food-equipment surfaces and drinking-water system components respectively.
What size cartridge gun or opening is needed for the 10 oz cartridge?
The 10 oz cartridge fits any standard caulking gun designed for tenth-gallon cartridges; cut the nozzle to the bead width the joint requires.
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