Duct Mastic | McMaster-Carr

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17 Products

Condensation-Reducing Protective Coatings

Pail

An alternative to jacketing, these coatings prevent condensation from forming on refrigeration, air conditioning lines, and cold-water piping. They are often used on irregularly shaped surfaces, such as fittings, flanges, and valves. All coatings adhere to metal.

Mastics—These coatings adhere to PVC and CPVC in addition to metal.

For Use Outdoors—These coatings create a vapor barrier and protect from conditions outdoors.

Container
Size, gal.	Type	Temp., ° F	Form	Approx. Coverage, ft²	Density, lb/gal	Begins to Harden, hr.	Color	For Use Outdoors		Each
1	Pail	-40 to 180	Mastic	16.5	11.3	2	White	Yes	2965N11	000000
1	Pail	-20 to 190	Mastic	16.5	12.1	2	White	Yes	2965N12	00000
5	Pail	0 to 150	Mastic	29	7.8	24	Black	No	4588K3	000000

Non-Hardening Caulk

Also known as thumb-grade caulk, this forms a non-hardening, moisture-resistant seal that remains pliable.

Butyl Mastic Strip

Image of Product. Front orientation. Butyl Mastic. Non-Hardening Caulk.

Butyl mastic has a clay-like consistency.

							Brown		Gray
Dia.	Lg., ft.	Tensile Strength	Hardness Rating	Temp. Range, ° F	For Joining	No. of Pieces		Each		Each
1/8"	30	Not Rated	Not Rated	-30 to 150	Glass Masonry Metal Plastic Rubber Wood Metal to Glass Metal to Plastic Metal to Rubber Plastic to Glass Plastic to Rubber Rubber to Glass	8	———	0	9408T146	00000
1/8"	45	Not Rated	Not Rated	-30 to 150	Glass Masonry Metal Plastic Rubber Wood Metal to Glass Metal to Plastic Metal to Rubber Plastic to Glass Plastic to Rubber Rubber to Glass	8	9408T144	00000	9408T17	0000
1/8"	90	Not Rated	Not Rated	-30 to 150	Glass Masonry Metal Plastic Rubber Wood Metal to Glass Metal to Plastic Metal to Rubber Plastic to Glass Plastic to Rubber Rubber to Glass	8	9408T145	0000	9408T14	0000

Moisture-Resistant Electrical Tape


No Spool	Cardboard Spool

Also known as mastic tape, this tape is thicker than other electrical tape to cushion, insulate, and seal out moisture and environmental contaminants in electrical connections.

3M Scotch 2200—Scotch 2200 tape has an all-weather-grade PVC facing.

3M Scotch 2210—Scotch 2210 tape offers excellent resistance to abrasion, chemicals, corrosion, and UV light.

3M Scotch 2228—Scotch 2228 tape is suitable for use with motor lead connections up to 1,000 volts and bus bar connections up to 35,000 volts.

3M Scotch 2229—Scotch 2229 tape conforms to and molds around irregular shapes for sealing applications.

							Temp., ° F
	Wd.	Lg.	Overall Thk.	Material	Facing Material	Performance	Min.	Max.	Spool Material	Dielectric Strength, V/mil	Voltage Rating, V	Color		Each
3M Scotch 2200



		3 1/4"	4 1/2"	0.125"	Mastic Rubber	PVC	Electrically Insulating, Moisture Resistant, Self-Fusing	0	175	—	300	600	Black	75735A67	00000


		4 1/2"	6 1/2"	0.125"	Mastic Rubber	PVC	Electrically Insulating, Moisture Resistant, Self-Fusing	0	175	—	300	600	Black	75735A68	0000


		3M Scotch 2210



				4"	10 ft.	0.09"	Mastic Rubber	Vinyl Plastic	Electrically Insulating, Moisture Resistant, Self-Fusing	0	175	Cardboard	300	600	Black	75735A66	00000


				3M Scotch 2228



						1"	10 ft.	0.065"	Mastic Rubber	—	Electrically Insulating, Moisture Resistant, Self-Fusing	Not Rated	190	Cardboard	500	600	Black	75735A71	00000


						2"	10 ft.	0.065"	Mastic Rubber	—	Electrically Insulating, Moisture Resistant, Self-Fusing	Not Rated	190	Cardboard	500	600	Black	75735A65	00000


						3M Scotch 2229



								1"	10 ft.	0.125"	Mastic Rubber	—	Electrically Insulating, Moisture Resistant, Self-Fusing	32	190	Cardboard	370	600	Black	75735A72	00000


								2 1/2"	3 3/4"	0.125"	Mastic Rubber	—	Electrically Insulating, Moisture Resistant, Self-Fusing	32	190	—	370	600	Black	75735A73	0000
								3 3/4"	6 1/2"	0.125"	Mastic Rubber	—	Electrically Insulating, Moisture Resistant, Self-Fusing	32	190	—	370	600	Black	75735A74	0000

Electrical Putty Tape

Also known as Scotchfil, this noncorrosive putty tape wraps, stretches, and molds around irregular shapes for insulation buildup.

	Material	Temp. Range, ° F	Dielectric Strength, V/mil	Voltage Rating, V	Certification	Color		Each
3M Scotchfil







	Self-Fusing

	1 1/2"	5	0.125"	Mastic Rubber	-40 to 175	22,000	600	UL Listed	Black	75695A67	000000