Marine Caulk | McMaster-Carr

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20 Products

About Sealant Flexibility

These non-sagging sealants will not drip while hardening on vertical and overhead surfaces. They’re marine grade, so they stand up to water, corrosion from salt spray, mildew, and UV light.

Sika Sikaflex sealants meet NSF/ANSI 61 safety standards for use with drinking water.

Silicone sealant is FDA compliant for direct contact with food. It will not harm fish, so it's safe for use in aquariums. It's also known as RTV (room-temperature vulcanizing).

Elongation and joint compression/expansion tolerance indicate flexibility—the higher the values are, the more joint movement sealants can sustain. Sealants that are good for joining dissimilar materials also work well in environments with wide temperature fluctuation.

	Container
Mfr. Model No.	Size, fl. oz.	Type	Begins to Harden	Reaches Full Strength	Elongation	Joint Compression/ Expansion Tolerance	Hardness	Temp. Range, °F	Specifications Met	For Joining	Choose a Color		Each
3M Hybrid Polymer
4000UV	3	Tube	25 min.	24 hrs.	700%	Not Rated	Medium Soft (Durometer 40A)	-40° to 190°	__	Metal Metal to Composites Composites Wood	White	00000000	000000
4000UV	10	Cartridge	25 min.	24 hrs.	700%	Not Rated	Medium Soft (Durometer 40A)	-40° to 190°	__	Metal Metal to Composites Composites Wood	White	00000000	00000
4000UV	20.3	Sausage Pack	30 min.	24 hrs.	700%	Not Rated	Medium Soft (Durometer 40A)	-40° to 190°	__	Metal Metal to Plastic Metal to Composites Plastic Plastic to Composites Composites Wood	White	00000000	00000
3M Polyurethane
4200 FC	3	Tube	2 hrs.	24 hrs.	400%	Not Rated	Medium Soft (Durometer 40A)	-40° to 190°	__	Metal Metal to Plastic Metal to Composites Metal to Glass Plastic Plastic to Composites Plastic to Glass Composites Glass Wood Wood to Glass	White	00000000	00000
4200 FC	10	Cartridge	2 hrs.	24 hrs.	400%	Not Rated	Medium Soft (Durometer 40A)	-40° to 190°	__	Metal Metal to Plastic Metal to Composites Metal to Glass Plastic Plastic to Composites Plastic to Glass Composites Glass Wood Wood to Glass	Black, White	00000000	00000
Sika Sikaflex Polyurethane
291	10.1	Cartridge	60 min.	3 days	500%	-12.5% to 12.5%	Medium Soft (Durometer 40A)	-40° to 190°	NSF/ANSI 61	Metal	Black, White	000000	00000
Silicone
__	2.8	Tube	5 min.	48 hrs.	Not Rated	-25% to 25%	Not Rated	-40° to 400°	ASTM C920 Type S Grade NS Class 25, FDA Compliant 21 CFR 177.2600	Metal Plastic Rubber Glass	Clear	0000000	0000
__	10.3	Cartridge	20 min.	24 hrs.	500%	-25% to 25%	Soft (Durometer 26A)	-40° to 400°	ASTM C920 Type S Grade NS Class 25, FDA Compliant 21 CFR 177.2600	Metal Glass Wood	Aluminum, Black, Clear, White	0000000	0000

Primer for Sika Sikaflex Sealants (3.4 fl. oz Bottle)

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Each

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Structural Submersible Sealants

The strongest submersible sealants we offer, these combine the mechanical strength of an adhesive with excellent sealing properties and high flexibility. They’re marine grade, so they stand up to water, corrosion from salt spray, mildew, and UV light. Sealants are non-sagging, so they won't drip from vertical and overhead surfaces.

Elongation indicates flexibility—the higher the values are, the more sealants can stretch. These sealants are good for use between dissimilar materials and in environments with wide temperature fluctuation. For high-wear applications, choose a harder sealant for the most abrasion resistance.

Certificates with a traceable lot number and product shelf life are available for these products. Download certificates from ORDER HISTORY after your order ships.

	Container
Mfr. Model No.	Size, fl. oz.	Type	Begins to Harden	Reaches Full Strength	Elongation	Tensile Strength, psi	Hardness	Temp. Range, °F	For Joining	Choose a Color		Each
3M Polyurethane
5200FC	3	Tube	60 min.	24 hrs.	900%	600	Medium Hard (Durometer 60A)	-40° to 190°	Metal Metal to Composites Composites Wood	White	00000000	000000
5200	3	Tube	72 hrs.	7 days	700%	700	Hard (Durometer 68A)	-40° to 190°	Metal Metal to Composites Composites Wood	Black, White	00000000	00000
5200FC	10	Cartridge	60 min.	24 hrs.	900%	600	Medium Hard (Durometer 60A)	-40° to 190°	Metal Metal to Composites Composites Wood	White	00000000	00000
5200	10	Cartridge	72 hrs.	7 days	700%	700	Hard (Durometer 68A)	-40° to 190°	Metal Metal to Composites Composites Wood	Black, Mahogany, White	00000000	00000

All-Weather Application Sealants

Apply these sealants on wet surfaces and in cold temperatures. They’re non-sagging, so they won't drip from vertical and overhead surfaces.

Sealants with 1,000% elongation can be applied through running water.

Sealants that cannot be sold to the regions listed are restricted by local chemical regulations, including limits on VOC (volatile organic compounds).

Container
Size, fl. oz.	Type	Begins to Harden	Reaches Full Strength	Elongation	Joint Compression/ Expansion Tolerance	Hardness	Temp. Range, °F	For Joining	Choose a Color	Cannot Be Sold To		Each
Hybrid Polymer
9	Cartridge	10 min.	3 days	450%	-50% to 50%	Medium Soft (Durometer 44A)	-10° to 150°	Metal Metal to Glass Glass Masonry Wood Wood to Glass	Clear	__	000000000	000000	00
9 1/2	Cartridge	20 min.	3 days	570%	-50% to 50%	Soft (Durometer 32A)	-10° to 150°	Metal Metal to Glass Glass Masonry Wood Wood to Glass	Black	__	000000000	00000	00
9 1/2	Cartridge	20 min.	3 days	570%	-50% to 50%	Soft (Durometer 32A)	-10° to 150°	Metal Metal to Glass Glass Masonry Wood Wood to Glass	White	__	000000000	00000	00
												Each
												1-11	12-Up
10	Cartridge	1 sec.	5 days	870%	-25% to 25%	Soft (Durometer 20A)	-40° to 180°	Metal Masonry Wood	Clear	__	0000000	00000	000000
10	Cartridge	1 sec.	5 days	870%	-25% to 25%	Soft (Durometer 25A)	-40° to 180°	Metal Masonry Wood	White	CA, Canada	0000000	00000	00000
10	Cartridge	8 hrs.	14 days	550%	-25% to 25%	Soft (Durometer 22A)	-20° to 200°	Metal Metal to Plastic Metal to Composites Plastic Plastic to Composites Composites Masonry Wood	Almond, Black, Bronze, Brown, Clear, Gray, White	__	000000	00000	00000
10.3	Cartridge	45 min.	4 days	1,000%	Not Rated	Soft (Durometer 25A)	-40° to 180°	Metal Plastic Rubber Asphalt Composites Glass Masonry Wood	Black, White	CA, Canada	000000	00000	00000