Metal-Duct Sealants | McMaster-Carr

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Fed. Spec. TT-S-00230

Fed. Spec. TT-S-001543 Class A

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5 Products

Metal Duct HVAC Sealants


Cartridge	Pail

Seal metal-to-metal joints in ductwork. These sealants are non-sagging, so they won't drip from vertical and overhead surfaces.

	Container								Temp., ° F
	Size	Type	Begins to Harden, min.	Reaches Full Strength, hr.	Elongation	Joint Compression/Expansion Tolerance	Tensile Strength	Hardness Rating	Min.	Max.	For Joining	Color (Clarity)		Each
Acrylic Plastic



		10.1 fl. oz.	Cartridge	15	48	Not Rated	Not Rated	Not Rated	Soft (Durometer 20A)	-40	200	Metal	Gray (Opaque)	73335A65	00000


		1 gal.	Pail	15	48	Not Rated	Not Rated	Not Rated	Soft (Durometer 20A)	-40	200	Metal	Gray (Opaque)	73335A66	00000

HVAC Sealants

Form flexible water-resistant seals on metal, plastic, and rubber joints in heating, ventilation, air conditioning, and refrigeration applications. These sealants are non-sagging, so they won't drip from vertical and overhead surfaces. Made from silicone rubber, sealants are RTV (room-temperature vulcanizing).

Elongation and joint compression/expansion tolerance indicate flexibility—the higher the values are, the more joint movement sealants can sustain.

Dow Silicone Rubber

Container
Size, fl. oz.	Type	Begins to Harden, min.	Reaches Full Strength, hr.	Elongation	Joint Compression/Expansion Tolerance	Tensile Strength, psi	Hardness Rating	Temp. Range, ° F	Certification	Food Industry Std.	Flammability Rating	For Joining	Choose a Color (Clarity)		Each
10.3	Cartridge	5	24	600%	-25% to 25%	325	Soft (Durometer 27A)	-40 to 350	UL Listed	FDA Compliant 21 CFR 177.2600	UL 94 HB	Composite Metal Plastic Rubber Metal to Composite Metal to Plastic Metal to Rubber	Aluminum, Clear, White (Semi-Clear)	1919N3	000000

Sealant Primers

		Each
PR-1200 Primer for Dow 700, 732, 733, 734, 736, 737, 739, 786, 995, Loctite®, 76435T21, 76435T11, 7545A611 and 1919N3 Sealants (10.9 fl. oz. Bottle)	7442A23	000000

Silicone Rubber

Container
Size, fl. oz.	Type	Begins to Harden, min.	Reaches Full Strength, hr.	Elongation	Joint Compression/Expansion Tolerance	Tensile Strength	Hardness Rating	Temp. Range, ° F	Mil. Spec.	For Joining	Choose a Color (Clarity)		Each
9.4	Cartridge	20	24	Not Rated	-25% to 25%	Not Rated	Soft (Durometer 26A)	-60 to 400	Fed. Spec. TT-S-00230 Fed. Spec. TT-S-001543 Class A	Composite Metal Plastic Rubber Metal to Composite Metal to Plastic Metal to Rubber	Clear (Clear), Gray (Opaque), White (Opaque)	1919N16	00000