About Sealant Flexibility
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Structural Sealants


These structural sealants combine the mechanical strength of an adhesive with excellent sealing properties and high flexibility. They’re non-sagging, so they won't drip from vertical and overhead surfaces.
Elongation and joint compression/expansion tolerance indicate flexibility—the higher the values are, the more joint movement sealants can sustain. For joints between dissimilar materials and in environments with wide temperature fluctuation, choose a sealant with a higher elongation or joint compression/expansion tolerance. For high-wear applications, choose a harder sealant for the most abrasion resistance.
Container | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Mfr. Model No. | Size, fl. oz. | Type | Begins to Harden | Reaches Full Strength | Elongation | Joint Compression/ Expansion Tolerance | Hardness | Temp. Range, °F | For Joining | Choose a Color | Each | |
3M Polyurethane | ||||||||||||
540 | 20.3 | Sausage Pack | 90 min. | 24 hrs. | 600% | -25% to 25% | Medium Soft (Durometer 40A) | -40° to 190° | Metal Plastic Rubber Composites Wood | 00000000 | 000000 | |
551 | 20.3 | Sausage Pack | 180 min. | 24 hrs. | 600% | Not Rated | Medium (Durometer 45A) | -40° to 190° | Metal Metal to Plastic Metal to Rubber Metal to Composites Plastic Plastic to Rubber Plastic to Composites Rubber Rubber to Composites Composites Wood | White | 00000000 | 00000 |
560 | 20.3 | Sausage Pack | 60 min. | 24 hrs. | 300% | Not Rated | Medium Hard (Durometer 55A) | -40° to 190° | Metal Metal to Plastic Metal to Rubber Metal to Composites Plastic Plastic to Rubber Plastic to Composites Rubber Rubber to Composites Composites Wood | 00000000 | 00000 | |
Sika Sikaflex Polyurethane | ||||||||||||
1-A | 10.1 | Cartridge | 6 hrs. | 7 days | 550% | -35% to 35% | Medium Soft (Durometer 35A) | -40° to 170° | Metal Metal to Plastic Metal to Rubber Metal to Composites Plastic Plastic to Rubber Plastic to Composites Rubber Rubber to Composites Composites Masonry Wood | 0000000 | 00000 | |
1-A | 20 | Sausage Pack | 6 hrs. | 7 days | 550% | -35% to 35% | Medium Soft (Durometer 35A) | -40° to 170° | Metal Metal to Plastic Metal to Rubber Metal to Composites Plastic Plastic to Rubber Plastic to Composites Rubber Rubber to Composites Composites Masonry Wood | Limestone | 00000000 | 00000 |
15LM | 10.1 | Cartridge | 6 hrs. | 7 days | 700% | -50% to 100% | Soft (Durometer 20A) | -40° to 170° | Metal Metal to Plastic Metal to Rubber Metal to Composites Plastic Plastic to Rubber Plastic to Composites Rubber Rubber to Composites Composites Masonry Wood | 00000000 | 00000 | |
252 | 10.1 | Cartridge | 40 min. | 3 days | 400% | Not Rated | Medium (Durometer 50A) | -40° to 190° | Metal Metal to Composites Composites Wood | 000000 | 00000 |
Primer for Sika Sikaflex Sealants (3.4-oz Bottle) | 0000000 | Each | 000000 |
Sealants

These sealants are non-sagging, so they won't drip from vertical and overhead surfaces.
Elongation and joint compression/expansion tolerance indicate flexibility. For joints between dissimilar materials and in environments with wide temperature fluctuation, choose a sealant with a higher elongation or joint compression/expansion tolerance. For high-wear applications, choose a harder sealant for the most abrasion resistance.
Container | ||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Mfr. Model No. | Size, fl. oz. | Type | Begins to Harden | Reaches Full Strength | Elongation | Joint Compression/ Expansion Tolerance | Tensile Strength, psi | Hardness | Temp. Range, °F | For Joining | Choose a Color | Each | ||
Sika Sikaflex Polyurethane | ||||||||||||||
201 | 10.1 | Cartridge | 4 hrs. | 3 days | 550% | -35% to 35% | 175 | Medium Soft (Durometer 45A) | -40° to 190° | Metal Wood | 000000 | 000000 | 00 | |
221 | 10.1 | Cartridge | 60 min. | 3 days | 500% | -12.5% to 12.5% | 260 | Medium Soft (Durometer 40A) | -40° to 190° | Metal Metal to Plastic Metal to Rubber Plastic Plastic to Rubber Rubber Masonry | 000000 | 00000 | 00 | |
227 | 10.1 | Cartridge | 40 min. | 3 days | 600% | -12.5% to 12.5% | 245 | Medium Soft (Durometer 40A) | -40° to 190° | Metal Metal to Plastic Metal to Rubber Plastic Rubber | 000000 | 00000 | 00 | |
Each | ||||||||||||||
1-11 | 12-Up | |||||||||||||
Polyurethane | ||||||||||||||
__ | 10.1 | Cartridge | 3 hrs. | 24 hrs. | 880% | -25% to 25% | 200 | Medium (Durometer 45A) | -20° to 150° | Metal Metal to Plastic Metal to Rubber Metal to Composites Plastic Plastic to Rubber Rubber Rubber to Composites Asphalt Composites Masonry Wood | 0000000 | 0000 | 00000 |
Primer for Sika Sikaflex Polyurethane Sealants (3.4-oz Bottle) | 0000000 | Each | 000000 |
Puncture-Resistant Sealants


Form seals that resist punctures, cuts, and abrasion to withstand heavy wear and tampering. These sealants are non-sagging, so they won't drip from vertical and overhead surfaces.
Elongation and joint compression/expansion tolerance indicate flexibility—the higher the values are, the more joint movement sealants can sustain. These sealants are best suited to joints between similar materials that aren't exposed to wide temperature fluctuation.
Container | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Size, fl. oz. | Type | Begins to Harden | Reaches Full Strength | Elongation | Joint Compression/ Expansion Tolerance | Tensile Strength, psi | Hardness | Temp. Range, °F | For Joining | Color | Each | |
Polyurethane | ||||||||||||
10.1 | Cartridge | 90 min. | 48 hrs. | 225% | -12.5% to 12.5% | 250 | Medium (Durometer 55A) | 20° to 120° | Metal, Plastic, Rubber, Asphalt, Composites, Glass, Masonry, Wood | White | 0000000 | 000000 |
20 | Sausage Pack | 90 min. | 48 hrs. | 225% | -12.5% to 12.5% | 250 | Medium (Durometer 55A) | 20° to 120° | Metal, Plastic, Rubber, Asphalt, Composites, Glass, Masonry, Wood | White | 0000000 | 00000 |
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 | 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 | 00000000 | 00000 |
Submersible Sealants


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.
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 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 | 000000 |
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 | 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 | 000000 | 00000 |
Primer for Sika Sikaflex Sealants (3.4 fl. oz Bottle) | 0000000 | Each | 000000 |
Sealant Primers

Prepare joints and surfaces to ensure proper sealant adhesion.
3M P592 primer cannot be sold to the listed regions due to volatile organic compound regulations.
Container | ||||||||
---|---|---|---|---|---|---|---|---|
Mfr. Model No. | Size | Type | Drying Time | For Use On | Cannot Be Sold To | Choose a Color | Each | |
3M Primers | ||||||||
P591 | 8.5 fl. oz. | Bottle | 15 min. | Aluminum, Stainless Steel, Steel, Cast Iron, Galvanized Steel, ABS Plastic, Acrylic Plastic, Polycarbonate Plastic, Polystyrene Plastic, Polyurethane Rubber, PVC Plastic, Concrete, Glass, CPVC Plastic, PETG Plastic, PVDF Plastic, Polyimide Plastic, Fiberglass, Wood, Iron, Galvanized Iron | __ | Black | 0000000 | 000000 |
P592 | 8.5 fl. oz. | Bottle | 15 min. | Aluminum, Stainless Steel, Steel, Cast Iron, Galvanized Steel, Iron, Galvanized Iron | Los Angeles County, CA; Orange County, CA; Riverside County, CA; San Bernardino County, CA; CT; DC; DE; MA; MD; ME; NJ; Northern VA; NY; PA; RI; UT; VT | Clear | 0000000 | 000000 |
Dow Corning Primers | ||||||||
P5200 | 12 fl. oz. | Bottle | 2 hrs. | Stainless Steel, Steel, Cast Iron, Galvanized Steel, ABS Plastic, Polycarbonate Plastic, Polystyrene Plastic, Polyurethane Rubber, PVC Plastic, Glass, CPVC Plastic, PETG Plastic, PVDF Plastic, Polyimide Plastic, EPDM Rubber, SBR Rubber, Ceramic, Masonry, Wood, Iron, Silicone Rubber, Galvanized Iron | __ | 00000000 | 000000 | |
PR-1200 | 10.9 fl. oz. | Bottle | 2 hrs. | Aluminum, Brass, Bronze, Copper, Stainless Steel, Steel, Titanium, Cast Iron, Galvanized Steel, ABS Plastic, Polycarbonate Plastic, Polystyrene Plastic, Polyurethane Rubber, PVC Plastic, Glass, CPVC Plastic, PETG Plastic, PVDF Plastic, Polyimide Plastic, EPDM Rubber, SBR Rubber, Ceramic, Masonry, Wood, Iron, Silicone Rubber, Galvanized Iron | __ | 00000000 | 00000 | |
Sika Primers | ||||||||
207 | 3.4 fl. oz. | Bottle | 10 min. | Aluminum, Stainless Steel, Steel, Galvanized Steel, Acrylic Plastic, PVC Plastic, Glass, Fiberglass, Ceramic | __ | Black | 0000000 | 00000 |
High-Strength Self-Leveling Concrete Joint Sealants

Seal concrete joints in high-traffic locations—these sealants stand up to heavy wear and tear, such as steel wheel traffic. Thinner than non-sagging sealants, these flow easily into cracks and have a smooth finish.
Elongation and joint compression/expansion tolerance indicate flexibility—the higher the values are, the more joint movement sealants can sustain. These sealants are best suited to joints between similar materials that aren't exposed to wide temperature fluctuation. For high-wear applications, choose a harder sealant for the most abrasion resistance.
When Sika Sikaflex Polyurethane requires a primer, for best results use Primer 260 on metal and Primer 449 on plastic and rubber.
Container | For Max. Crack | ||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Mfr. Model No. | Size, fl. oz. | Type | Begins to Harden | Reaches Full Strength | Mix Ratio | Elongation | Joint Compression/ Expansion Tolerance | Hardness | Wd. | Dp. | Temp. Range, °F | For Joining | Color | Each | |
Loctite® Polyurethane | |||||||||||||||
PC 6231 | 8.6 | Cartridge | 3 min. | 90 min. | 1:1 | 82% | -10% to 10% | Hard (Durometer 75A) | 3/4" | 2 1/4" | -40° to 120° | Metal, Plastic, Rubber, Asphalt, Composites, Glass, Masonry, Wood | Gray | 0000000 | 000000 |
Sika Sikaflex Polyurethane | |||||||||||||||
1C SL | 10.1 | Cartridge | 2 hrs. | 5 days | __ | 320% | -25% to 25% | Medium Soft (Durometer 35A) | 1/2" | 1/2" | -40° to 170° | Metal, Plastic, Rubber, Composites, Glass, Masonry, Wood | Limestone | 0000000 | 00000 |
1C SL | 29 | Cartridge | 2 hrs. | 5 days | __ | 320% | -25% to 25% | Medium Soft (Durometer 35A) | 1/2" | 1/2" | -40° to 170° | Metal, Plastic, Rubber, Composites, Glass, Masonry, Wood | Limestone | 0000000 | 00000 |
Concrete Joint Sealants


Seal joints and gaps in concrete. These sealants are non-sagging, so they won't drip from vertical and overhead surfaces.
Elongation and joint compression/expansion tolerance indicate flexibility—the higher the values are, the more joint movement sealants can sustain. These sealants are best suited to joints between similar materials that aren't exposed to wide temperature fluctuation.
Container | For Max. Crack | ||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Mfr. Model No. | Size, fl. oz. | Type | Begins to Harden | Reaches Full Strength | Elongation | Joint Compression/ Expansion Tolerance | Hardness | Wd. | Dp. | Application Temp. Range, °F | Temp. Range, °F | For Joining | Color | Each | |
3M Polyurethane | |||||||||||||||
525 | 10.5 | Cartridge | 90 min. | 24 hrs. | 600% | Not Rated | Soft (Durometer 25A) | 1" | 1/2" | 40° to 95° | -20° to 175° | Metal, Plastic, Masonry, Wood | Gray | 0000000 | 000000 |
525 | 20.3 | Sausage Pack | 90 min. | 24 hrs. | 600% | Not Rated | Soft (Durometer 25A) | 1" | 1/2" | 40° to 95° | -20° to 175° | Metal, Plastic, Masonry, Wood | Gray | 0000000 | 00000 |
Impact-Resistant Structural Glass Sealants


Repair equipment and vehicle windows with these sealants that are rated to withstand impact within three hours of application. They’re non-sagging, so they won't drip from vertical and overhead surfaces. These sealants are good for use between dissimilar materials and in environments with wide temperature fluctuation. They’re crash tested and meet Federal Motor Vehicle Safety Standard 212 for windshield mounting.
Elongation indicates flexibility—the higher the value is, the more joint movement a sealant can sustain.
A primer is required. For best results use P591 for composites, glass, and fiberglass and P592 for aluminum, steel, and stainless steel.
Container | |||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Mfr. Model No. | Size, fl. oz. | Type | Begins to Harden | Reaches Full Strength | Elongation | Tensile Strength, psi | Hardness | Application Temp. Range, °F | Temp. Range, °F | For Joining | Color | Each | |
3M Polyurethane | |||||||||||||
590 | 10.5 | Cartridge | 40 min. | 24 hrs. | 700% | 1,200 | Medium Hard (Durometer 60A) | 40° to 95° | -40° to 200° | Metal Metal to Glass Composites Composites to Glass Glass | Black | 0000000 | 000000 |
590 | 20.3 | Sausage Pack | 40 min. | 24 hrs. | 700% | 1,200 | Medium Hard (Durometer 60A) | 40° to 95° | -40° to 200° | Metal Metal to Glass Composites Composites to Glass Glass | Black | 0000000 | 00000 |
Urethane Potting Compounds
Encase electronic assemblies in a layer of urethane for protection from dust, moisture, chemicals, mechanical shock, and vibration. Urethanes withstand a wide range of temperatures and are the best choice for cold-temperature applications. They have excellent flexibility, good chemical and moisture resistance, and provide good electrical insulation.
Cartridge potting compounds can be applied precisely through the included mixer nozzle. You’ll need a dispensing gun (sold separately). US2350™ also require a 4:1 plunger (sold separately) to dispense.
Bottle potting compounds are easier to apply in high volumes than cartridge potting compounds. Mix the compounds together and pour them over components inside potting boxes and other containers. If mixing introduces any air bubbles, put the mixture in a vacuum chamber.
Compounds that cannot be sold to the listed areas are restricted by product labeling requirements.

Dry Time | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
Mfr. Model No. | Container Size, fl. oz. | Consistency | Touch, min. | Overall, hrs. | Dielectric Strength, V/mil | Thermal Conductivity, W/m-K | Temp. Range, °F | For Use On | Color | Each | |
Loctite® Compounds—Medium Hard | |||||||||||
US2350 | 1.69 | Thick Liquid | 90 | 24 | 950 | 0.51 | -40° to 250° | Aluminum, Brass, Bronze, Copper, Steel, Stainless Steel, Ceramic, Glass, Polycarbonate Plastic, Polyurethane Rubber, ABS Plastic, PVC Plastic, Polyimide Plastic, Garolite | Black | 0000000 | 000000 |
Loctite® Compounds—Soft | |||||||||||
US2651 | 6.76 | Thin Liquid | 10 | 16 | 1,050 | Not Rated | -85° to 250° | Aluminum, Brass, Bronze, Copper, Steel, Stainless Steel, Ceramic, Glass, Polycarbonate Plastic, Polyurethane Rubber, ABS Plastic, PVC Plastic, Polyimide Plastic, Garolite | Amber | 0000000 | 00000 |

Dry Time | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
Container Size, fl. oz. | Consistency | Touch, min. | Overall, hrs. | Dielectric Strength, V/mil | Thermal Conductivity, W/m-K | Temp. Range, °F | For Use On | Color | Cannot Be Sold To | Each | |
Extra Hard | |||||||||||
12.6 | Thin Liquid | 45 | 24 | 400 | 0.3 | -55° to 245° | Aluminum, Brass, Bronze, Copper, Steel, Stainless Steel, Ceramic, Glass, Polycarbonate Plastic, Polyurethane Rubber, ABS Plastic, PVC Plastic, Polyimide Plastic, Garolite | Black | Canada | 00000000 | 000000 |
Light-Activated Urethane Potting Compounds

In just 20 seconds under a UV light, these urethane compounds form into a strong protective layer on electrical components. They withstand a wide range of temperatures and are good electrical insulators. They also stop chemicals, moisture, and dust from damaging your device. With excellent flexibility, they protect against vibration and impact. Since they also work as an adhesive, you can use them to bond and insulate components such as electrical connectors and thermal switches. No mixing required.
Dry Time | |||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Container Size, fl. oz. | Consistency | Touch, sec. | Overall, sec. | Light Intensity Requirements to Reach Full Strength | Cure Type | Hardness Rating | Dielectric Strength, V/mil | Thermal Conductivity | Temp. Range, °F | For Use On | Color | Each | |
1.69 | Thin Liquid | 20 | 20 | 20 sec. @ 100 mW/cm2 | UV Light | Extra Hard | 1,800 | Not Rated | -40° to 250° | Aluminum, Brass, Bronze, Copper, Steel, Stainless Steel, Polycarbonate Plastic, ABS Plastic, PVC Plastic, Polyimide Plastic, Garolite, Ceramic, Glass, Plastic | Clear | 0000000 | 000000 |
Urethane Potting Compounds for Harsh Environments

From shore to sea floor, these potting compounds are formulated for permanent submersion in water—even salt water. Use them to protect circuits and splices in pumps, underwater lighting, and other underwater electronics from corrosion and chemicals. Made of urethane, they withstand a wide range of temperatures, especially cold underwater conditions. They provide good electrical insulation and have excellent flexibility. Since they’re more flexible than epoxy compounds, they’re often used to protect against vibration and impact.
Mix the two parts of these compounds together and pour them over components inside a potting box or other container. If mixing causes air bubbles, put the mixture in a vacuum chamber to remove them.
Dry Time | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Container Size, fl. oz. | Consistency | Touch, min. | Overall, hrs. | Hardness Rating | Dielectric Strength, V/mil | Thermal Conductivity, W/m-K | Temp. Range, °F | For Use On | Color | Cannot Be Sold To | Each | |
12.6 | Thin Liquid | 10 | 24 | Hard | 370 | 0.3 | -55° to 245° | Aluminum, Brass, Bronze, Copper, Steel, Stainless Steel, Ceramic, Glass, Polycarbonate Plastic, Polyurethane Rubber, ABS Plastic, PVC Plastic, Polyimide Plastic, Garolite | Black | Canada | 0000000 | 000000 |