McMaster-Carr logo
    Filter by
    Environment
    Mixing Required
    For Use Outdoors
    U.S.–Mexico–Canada Agreement (USMCA) Qualifying
    Industrial Info Compare
    Export Control Classification Number (ECCN)
    Industrial Info Snippet
    DFARS Specialty Metals
    Enter e-mail addresses in the fields below
    Message
    Cancel
    Comments
    E-mail address (if you would like a response)
    41 Products

    Waterproof Epoxy Structural Adhesives

    Image of Product. Pail. Front orientation. Pail.
    Image of Product. Single-Use Packet. Front orientation. Single-Use Packet.
    Image of Product. Stick. Front orientation. Stick.

    Pail

    Single-Use Packet

    Stick

    Image of Product. Syringe. Front orientation. Syringe.
    Image of Product. Tube. Front orientation. Tube.

    Syringe

    Tube

    Even when used underwater, these adhesives maintain their strength. Epoxies are the strongest and most chemical-resistant adhesives. They bond especially well on metal.
    These epoxies come in two parts that need to be mixed. The container size listed is the combined total of the two parts.
    Paste—Thicker than liquid adhesives but still spreadable—good for filling gaps and covering surfaces.
    Putty—Slice off a chunk and mold it into the shape you need.
    Thick Liquid—Flow into narrower gaps than gels and pastes, but thick enough to stay put on uneven surfaces.
    Container
    Strength
    Mfr. Model
    No.
    Size, fl.
    oz.
    Type
    Begins to
    Harden
    Reaches Full
    Strength
    Shear,
    psi
    Peel
    Mix
    Ratio
    Consistency
    Viscosity
    Temp. Range,
    ° F
    For Joining
    Pkg.
    Qty.
    Pkg.
    J-B Weld
     
    ClearWeld
    501140.5Syringe5 min.1 hr.1,5001:1Paste9,000 cPComposite, Metal, Plastic, Rubber17605A2500000
    50240H8Tube5 min.1 hr.1,5001:1Paste9,000 cPComposite, Metal, Plastic, Rubber17605A2300000
     
    MarineWeld
    82722Tube6 hr.24 hr.1,800Not Rated1:1Paste250,000 cPComposite, Metal, Plastic, Rubber17605A150000
    501720.85Syringe5 min.1 hr.1,800Not Rated1:1Paste100,000 cP-20 to 300Composite, Glass, Masonry, Metal, Plastic, Rubber, Wood17605A700000
     
    Plastic Bonder
    501330.85Syringe6 min.1 hr.1,7001:1Paste100,000 cPPlastic17605A240000
     
    WaterWeld
    8277Stick25 min.60 min.900Not RatedPuttyNot RatedComposite, Metal, Plastic, Rubber17605A160000
     
    Devcon
    11801Pail45 min.24 hr.2,6001:1PuttyNot Rated40 to 250Composite, Metal, Plastic17605A211000000
     
    Other Structural Adhesives
    Single-Use Packet25 min.7 day2,200Not Rated2.5:1Thick Liquid40,000 cP0 to 220Composite, Masonry, Metal107538A3300000
     

    Epoxy Structural Adhesives for Harsh Environments

    Image of Product. Can. Front orientation. Can.
    Image of Product. Cartridge. Front orientation. Cartridge.

    Can

    Cartridge

    With excellent resistance to corrosive chemicals, these epoxies maintain bonds in tough conditions.
    Epoxies are the strongest and most chemical-resistant structural adhesives. They bond especially well on metal. Choose an adhesive that hardens quickly for fast repairs, or one that hardens slowly to allow more time for positioning.
    These adhesives come in two parts that need to be mixed. The container size listed is the combined total of the two parts.
    Model Number E-120HP—Resist acetone, fuel, and oil. These adhesives also bond dissimilar materials and withstand rapid changes in temperature.
    Model Number 9430—Resist fuel and hydraulic fluid.
    Cartridge—To mix and dispense these adhesives, you'll need a mixer nozzle and dispensing gun.
    Thick Liquid—Flow into narrower gaps than gels and pastes, but thick enough to stay put on uneven surfaces.
    Container
    Strength
    Mfr. Model
    No.
    Size
    Type
    Begins to
    Harden
    Reaches Full
    Strength
    Shear
    Peel
    Mix
    Ratio
    Consistency
    Viscosity,
    cP
    Temp. Range,
    ° F
    Environment
    For Joining
    Each
    Loctite®
    E-120HP1.69 fl. oz.Cartridge2 hr.24 hr.4,300 psiNot Rated2:1Thick Liquid30,000-65 to 250Corrosive, Harsh, SubmersibleCeramic, Metal, Plastic, Rubber, Metal to Plastic, Metal to Rubber, Plastic to Rubber6430A24000000
    E-120HP6.76 fl. oz.Cartridge2 hr.24 hr.4,300 psiNot Rated2:1Thick Liquid30,000-65 to 250Corrosive, Harsh, SubmersibleCeramic, Metal, Plastic, Rubber, Metal to Plastic, Metal to Rubber, Plastic to Rubber1765A4400000
    E-120HP13.5 fl. oz.Cartridge2 hr.24 hr.4,300 psiNot Rated2:1Thick Liquid30,000-65 to 250Corrosive, Harsh, SubmersibleCeramic, Metal, Plastic, Rubber, Metal to Plastic, Metal to Rubber, Plastic to Rubber1765A43000000
    943032 fl. oz.Can50 min.5 day4,230 psi60 lbf/in. wd.3.78:1Thick Liquid12,000-65 to 180Corrosive, Harsh, SubmersibleMetal, Plastic, Rubber, Metal to Plastic, Metal to Rubber, Plastic to Rubber1813A238000000
    94301.25 gal.Can50 min.5 day4,230 psi60 lbf/in. wd.3.78:1Thick Liquid12,000-65 to 180Corrosive, Harsh, SubmersibleMetal, Plastic, Rubber, Metal to Plastic, Metal to Rubber, Plastic to Rubber1813A239000000
     
    Other Structural Adhesives
    1.69 fl. oz.Cartridge30 min.24 hr.360 psiNot Rated2:1Thick Liquid7,000-50 to 350Corrosive, Harsh, SubmersibleComposite, Metal, Plastic, Rubber, Metal to Composite, Metal to Plastic, Metal to Rubber, Plastic to Composite, Plastic to Rubber, Rubber to Composite7513A300000
    1.69 fl. oz.Cartridge40 min.24 hr.Not RatedNot Rated2:1Thick Liquid10,000-65 to 350Corrosive, Harsh, SubmersibleMetal, Plastic, Metal to Plastic7513A400000
     
    Accessories for Structural Adhesives

    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.
    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.
    3M Polymer
    Image of Product. Front orientation. Sealants. Submersible Sealants, Cartridge.
    Image of Product. Front orientation. Sealants. Submersible Sealants, Tube.
    Image of Product. Front orientation. Sealants. Submersible Sealants, Sausage Pack.

    Cartridge

    Tube

    Sausage Pack

    Container
    Mfr. Model
    No.
    Size, fl.
    oz.
    Type
    Begins to
    Harden, min.
    Reaches Full
    Strength, hr.
    Elongation
    Joint Compression/Expansion
    Tolerance
    Hardness Rating
    Temp. Range,
    ° F
    For Joining
    Color
    (Clarity)
    Each
    4000UV3Tube2524700%Not RatedMedium Soft (Durometer 40A)-40 to 190Composite
    Metal
    Wood
    Metal to Composite
    White (Opaque)67015A63000000
    4000UV10Cartridge2524700%Not RatedMedium Soft (Durometer 40A)-40 to 190Composite
    Metal
    Wood
    Metal to Composite
    White (Opaque)67015A6500000
    4000UV20.3Sausage Pack3024700%Not RatedMedium Soft (Durometer 40A)-40 to 190Composite
    Metal
    Plastic
    Wood
    Metal to Composite
    Metal to Plastic
    Plastic to Composite
    White (Opaque)67015A7400000
    3M Polyurethane Rubber
    Image of Product. Front orientation. Sealants. Submersible Sealants, Cartridge.
    Image of Product. Front orientation. Sealants. Submersible Sealants, Tube.

    Cartridge

    Tube

    Container
    Mfr. Model
    No.
    Size, fl.
    oz.
    Type
    Begins to
    Harden, hr.
    Reaches Full
    Strength, hr.
    Elongation
    Joint Compression/Expansion
    Tolerance
    Hardness Rating
    Temp. Range,
    ° F
    For Joining
    Choose a Color (Clarity)
    Each
    4200 FC3Tube224400%Not RatedMedium Soft (Durometer 40A)-40 to 190Composite
    Glass
    Metal
    Plastic
    Wood
    Metal to Composite
    Metal to Glass
    Metal to Plastic
    Plastic to Composite
    Plastic to Glass
    Wood to Glass
    White (Opaque)67015A71000000
    4200 FC10Cartridge224400%Not RatedMedium Soft (Durometer 40A)-40 to 190Composite
    Glass
    Metal
    Plastic
    Wood
    Metal to Composite
    Metal to Glass
    Metal to Plastic
    Plastic to Composite
    Plastic to Glass
    Wood to Glass
    Black (Opaque), White (Opaque)67015A7500000
    Sika Sikaflex Polyurethane Rubber
    Image of Product. Front orientation. Sealants. Submersible Sealants, Cartridge.

    Cartridge

    Sika Sikaflex sealants meet NSF/ANSI 61 safety standards for use with drinking water.
    Container
    Mfr. Model
    No.
    Size, fl.
    oz.
    Type
    Begins to
    Harden, min.
    Reaches Full
    Strength, day
    Elongation
    Joint Compression/Expansion
    Tolerance
    Hardness Rating
    Temp. Range,
    ° F
    Food Industry
    Std.
    For
    Joining
    Choose a Color (Clarity)
    Each
    29110.1Cartridge603500%-12.5% to 12.5%Medium Soft (Durometer 40A)-40 to 190NSF/ANSI 61
    MetalBlack (Opaque), White (Opaque)6937T7000000
    Sealant Primers
    Silicone Rubber
    Image of Product. Front orientation. Sealants. Submersible Sealants, Cartridge.
    Image of Product. Front orientation. Sealants. Submersible Sealants, Tube.

    Cartridge

    Tube

    Silicone rubber 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).
    Container
    Size, fl.
    oz.
    Type
    Begins to
    Harden, min.
    Reaches Full
    Strength, hr.
    Elongation
    Joint Compression/Expansion
    Tolerance
    Hardness Rating
    Temp. Range,
    ° F
    Food Industry Std.
    Specs. Met
    For Joining
    Choose a Color (Clarity)
    Each
    2.8Tube548Not Rated-25% to 25%Not Rated-40 to 400FDA Compliant 21 CFR 177.2600
    ASTM C920 Type S Grade NS Class 25Glass
    Metal
    Plastic
    Rubber
    Clear (Clear)7327A2100000
    10.3Cartridge2024500%-25% to 25%Soft (Durometer 26A)-40 to 400FDA Compliant 21 CFR 177.2600
    ASTM C920 Type S Grade NS Class 25Glass
    Metal
    Wood
    Aluminum (Opaque), Black (Opaque), Clear (Clear), White (Opaque)7327A150000

    Structural Submersible Sealants

    Image of Product. Front orientation. Sealants. Structural Submersible Sealants, Cartridge.
    Image of Product. Front orientation. Sealants. Structural Submersible Sealants, Tube.

    Cartridge

    Tube

    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.
    Material Certificate Icon
    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
    Temp.,
    ° F
    Mfr. Model
    No.
    Size, fl.
    oz.
    Type
    Begins to
    Harden
    Reaches Full
    Strength
    Elongation
    Joint Compression/Expansion
    Tolerance
    Tensile Strength,
    psi
    Hardness Rating
    Min.
    Max.
    For Joining
    Choose a Color (Clarity)
    Each
    3M Polyurethane Rubber
    5200FC3Tube60 min.24 hr.900%Not Rated600Medium Hard (Durometer 60A)-40190Composite
    Metal
    Wood
    Metal to Composite
    White (Opaque)67015A42000000
    5200FC10Cartridge60 min.24 hr.900%Not Rated600Medium Hard (Durometer 60A)-40190Composite
    Metal
    Wood
    Metal to Composite
    White (Opaque)67015A4400000
    52003Tube72 hr.7 day700%Not Rated700Hard (Durometer 68A)-40190Composite
    Metal
    Wood
    Metal to Composite
    Black (Opaque), White (Opaque)67015A7600000
    520010Cartridge72 hr.7 day700%Not Rated700Hard (Durometer 68A)-40190Composite
    Metal
    Wood
    Metal to Composite
    Black (Opaque), Mahogany (Opaque), White (Opaque)67015A7700000
     

    Epoxy Potting Compounds for Harsh Environments

    Image of Product. Front orientation. Potting Compounds. Epoxy Potting Compounds for Harsh Environments.
    Tough enough to be permanently submersed in seawater, these compounds protect sensitive electronics, such as circuit boards, semiconductors, and sensors in harsh environments. They resist moisture, salt, and chemicals, so you can use them in corrosive oil, marine, and mining applications. These compounds can also be used within autoclaves. Because they are epoxies, they are rigid, resist wear, and create excellent electrical insulation. They withstand a wide range of temperatures, and this formulation won’t crack or split as components heat up and cool down.
    They come in a cartridge, so you can apply them precisely. To dispense, they require a mixer nozzle and gun (both sold separately).
    Dry
    Time, hr.
    Container
    Size, fl. oz.
    Consistency
    Touch
    Overall
    Mixer Nozzle
    Included
    Mix
    Ratio
    Dielectric Strength,
    V/mil
    Thermal
    Conductivity
    Temp. Range,
    ° F
    Environment
    For Use On
    Autoclavable
    Each
    Cartridge Potting Compounds—Extra Hard
    1.69Thick Liquid1224No2:1500Not Rated-50 to 350Corrosive, Harsh, SubmersibleBrass, Bronze, Cast Iron, Copper, Steel, Stainless Steel, Titanium, Polycarbonate, Polyurethane Rubber, Glass, ABS, CPVC, HDPE, Nylon, PEEK, Polyethylene, Polyimide, Polypropylene, Polystyrene, PVC, PVDF, UHMW PolyethyleneYes5872N11000000
     
    Accessories for Compounds

    Urethane Potting Compounds for Harsh Environments

    Image of Product. Front orientation. Potting Compounds. 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,
    hr.
    Mix
    Ratio
    Dielectric Strength,
    V/mil
    Thermal Conductivity,
    W/(m⋅°C)
    Temp. Range,
    ° F
    Environment
    For Use On
    Color
    Clarity
    Cannot Be
    Sold To
    Each
    Bottle Potting Compounds—Hard
    12.6Thin Liquid10242:13700.3-55 to 245Corrosive, Harsh, SubmersibleAluminum, Brass, Bronze, Copper, Steel, Stainless Steel, Polycarbonate, Polyurethane Rubber, Ceramic, Glass, ABS, Garolite, Polyimide, PVCBlackOpaqueCanada6094N11000000
     

    Optically Clear Two-Part Silicone Rubber Potting Compounds

    Clear enough to read through, these UV-resistant potting compounds allow optimal light transmission for use with LEDs, solar cells, and fiber optics. Use them to encase electronic assemblies for protection from dust, moisture, mechanical shock, and vibration. Softer and more flexible than epoxies and urethanes with the widest temperature range, these silicone rubber compounds are the best choice for high-temperature applications and electronics exposed to thermal cycling. They have excellent electrical insulation and good moisture resistance but poor chemical and abrasion resistance. Also known as RTV (room-temperature vulcanizing).
    Bottle—Compounds in a bottle are easy to apply in high volumes. Just mix and pour them over components inside containers, such as potting boxes.
    Gel—Gel compounds form a soft and flexible layer of protection. You can also remove them if you need to re-access your components. They are rated IP68 once potted, so they seal out water even if submersed.
    Dry
    Time, min.
    Container
    Size, fl. oz.
    Consistency
    Touch
    Overall
    Mix
    Ratio
    Dielectric Strength,
    V/mil
    Thermal Conductivity,
    W/(m⋅°C)
    Temp. Range,
    ° F
    Enclosure
    Rating
    Environment
    For Use On
    Color
    Clarity
    Each
    Bottle Potting Compounds
    10.1Gel15151:15000.2-75 to 355IP68
    Dusty, SubmersibleAluminum, Brass, Bronze, Copper, Steel, Stainless Steel, Silver, Titanium, Plastic, Composite, FiberglassClearClear74965A52000000
     

    Reusable Silicone Rubber Potting Compounds

    Image of ProductInUse. Front orientation. Potting Compounds. Reusable Silicone Rubber Potting Compounds.
    Image of Product. Front orientation. Potting Compounds. Reusable Silicone Rubber Potting Compounds, Bottle Potting Compounds.
    Image of Product. Front orientation. Potting Compounds. Reusable Silicone Rubber Potting Compounds, Cartridge Potting Compounds.

    Bottle

    Potting

    Compounds

    Cartridge Potting Compounds

    Make repairs or changes to electrical components after they’ve been potted. While most compounds are permanent, these form a gel that bonds to itself, so you can peel it off without damaging your equipment. Often used in junction boxes, they form a water- and dust-proof seal that’s rated IP68 while also providing excellent electrical insulation. Made of silicone rubber, they withstand a wide range of temperatures and are soft and flexible enough to resist shock and vibration. However, they’re not as strong as permanent potting compounds, so they don’t resist scrapes as well as those made of epoxy and urethane. They’re also not as chemical resistant as epoxy and urethane compounds.
    These compounds won’t solidify once you open the container, so you have time to make adjustments when applying them. When removing them from your components, they mostly come off in one piece but there might be some residue left over.
    Bottle Potting Compounds—Bottle compounds are a better choice for filling up new enclosures than cartridge compounds because you can pour more in at a time. They have a compartment for each component and require mixing.
    Cartridge Potting Compounds—Cartridge compounds have a nozzle for precise application. The nozzle can also fit into junction box knockouts, so it’s easier to fill up installed enclosures than it is with bottle compounds. They come ready to use with no mixing required and no waiting time.
    Dry
    Time, min.
    Container
    Size, fl. oz.
    Consistency
    Touch
    Overall
    Mix
    Ratio
    Dielectric Strength,
    V/mil
    Thermal Conductivity,
    W/(m⋅°C)
    Temp. Range,
    ° F
    Enclosure
    Rating
    Environment
    For Use On
    Color
    Clarity
    Each
    Bottle Potting Compounds
    8.4Gel15151:15000.2-75 to 390IP68
    Dusty, SubmersibleAluminum, Brass, Bronze, Copper, Steel, Stainless Steel, Titanium, Plastic, Rubber, Composite, Fiberglass, Ceramic, GlassBlueSemi-Clear6355N11000000
    33.8Gel15151:15000.2-75 to 390IP68
    Dusty, SubmersibleAluminum, Brass, Bronze, Copper, Steel, Stainless Steel, Titanium, Plastic, Rubber, Composite, Fiberglass, Ceramic, GlassBlueSemi-Clear6355N1200000
     
    Cartridge Potting Compounds
    9.4Gel5000.2-75 to 390IP68
    Dusty, SubmersibleAluminum, Brass, Bronze, Copper, Steel, Stainless Steel, Titanium, Plastic, Rubber, Composite, Fiberglass, Ceramic, GlassClearClear6355N1300000
     
    back to top