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

    Silicone Rubber Sealants

    Made from silicone rubber, these sealants are RTV (room-temperature vulcanizing). 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. Sealants that are good for joining dissimilar materials also work well in environments with wide temperature fluctuation.
    Silicone Rubber
    Image of Product. Front orientation. Sealants. Silicone Rubber Sealants, Nozzle-Top Can.

    Nozzle-Top

    Can

    Cannot Be Sold Outside United States—Sealants that cannot be sold outside the United States are restricted due to chemical regulations and/or product labeling requirements.
    Begins to
    Harden, min.
    Elongation
    Joint Compression/Expansion
    Tolerance
    Hardness Rating
    Temp. Range,
    ° F
    For Joining
    Food Industry Std.
    Mil. Spec.
    Specs. Met
    Cannot Be Sold To
    Color
    (Clarity)
    Each
    6 1/2 oz. Nozzle-Top Can
     
    24 hr. Reaches Full Strength
    1400%-25% to 25%Soft (Durometer 21A)-70 to 400Glass
    Metal
    Metal to Glass
    Fed. Spec. TT-S-00230
    Fed. Spec. TT-S-001543
    MIL-A-46106 Type I
    Outside United StatesClear (Clear)75075A68000000
    10400%-25% to 25%Soft (Durometer 25A)-70 to 400Glass
    Masonry
    Metal
    Plastic
    Rubber
    Wood
    Metal to Glass
    Metal to Plastic
    Metal to Rubber
    Plastic to Glass
    Plastic to Rubber
    Rubber to Glass
    FDA Compliant 21 CFR 177.2600
    NSF/ANSI 51
    Fed. Spec. TT-S-00230
    Fed. Spec. TT-S-001543
    MIL-A-46106 Type I
    ASTM C920 Type S Grade NS Class 25Outside United StatesWhite (Opaque)75075A6900000
    10500%-25% to 25%Soft (Durometer 25A)-60 to 450Glass
    Metal
    Metal to Glass
    Fed. Spec. TT-S-00230
    Fed. Spec. TT-S-001543
    MIL-A-46106 Type I
    Outside United StatesBlue (Opaque)75075A6200000
    20560%-25% to 25%Soft (Durometer 23A)-80 to 500Glass
    Masonry
    Metal
    Plastic
    Rubber
    Wood
    Metal to Glass
    Metal to Plastic
    Metal to Rubber
    Plastic to Glass
    Plastic to Rubber
    Rubber to Glass
    Fed. Spec. TT-S-00230
    Fed. Spec. TT-S-001543
    MIL-A-46106 Type I
    Outside United StatesRed (Opaque)75075A6300000
    20560%-25% to 25%Soft (Durometer 23A)-30 to 450Glass
    Metal
    Metal to Glass
    Fed. Spec. TT-S-00230
    Fed. Spec. TT-S-001543
    MIL-A-46106 Type I
    Outside United StatesBlack (Opaque)75075A6400000
     

    All-Weather Application Sealants

    Image of Product. Front orientation. Sealants. 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.
    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
    Temp.,
    ° F
    Size, fl.
    oz.
    Type
    Begins to
    Harden, min.
    Reaches Full
    Strength, day
    Elongation
    Joint Compression/Expansion
    Tolerance
    Tensile Strength,
    psi
    Hardness Rating
    Application
    Temp. Range, ° F
    Min.
    Max.
    For Joining
    Color
    (Clarity)
    Each
    Polymer
    9Cartridge103450%-50% to 50%385Medium Soft (Durometer 44A)0 to 140-10150Glass
    Masonry
    Metal
    Wood
    Metal to Glass
    Wood to Glass
    Clear (Clear)74565A111000000
    9.5Cartridge203570%-50% to 50%230Soft (Durometer 32A)0 to 140-10150Glass
    Masonry
    Metal
    Wood
    Metal to Glass
    Wood to Glass
    Black (Opaque)74565A11300000
    9.5Cartridge203570%-50% to 50%230Soft (Durometer 32A)0 to 140-10150Glass
    Masonry
    Metal
    Wood
    Metal to Glass
    Wood to Glass
    White (Opaque)74565A11200000
     

    Mildew-Resistant Silicone Rubber Sealants

    Resistant to mold and mildew, these sealants are well suited to high-humidity environments. They’re 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. Sealants that are good for joining dissimilar materials also work well in environments with wide temperature fluctuation.
    Silicone Rubber
    Image of Product. Front orientation. Sealants. Mildew-Resistant Silicone Rubber Sealants, Cartridge.

    Cartridge

    Cannot Be Sold to Canada—Silicone rubber sealants that cannot be sold to Canada are restricted due to product labeling requirements.
    Container
    Size, fl.
    oz.
    Type
    Begins to
    Harden, min.
    Reaches Full
    Strength, hr.
    Elongation
    Joint Compression/Expansion
    Tolerance
    Temp. Range,
    ° F
    For Joining
    Mil. Spec.
    Specs. Met
    Color
    (Clarity)
    Cannot Be
    Sold To
    Each
    10.1Cartridge2024430%-25% to 25%-80 to 350Glass
    Masonry
    Metal
    Plastic
    Rubber
    Wood
    Metal to Glass
    Metal to Plastic
    Metal to Rubber
    Plastic to Glass
    Plastic to Rubber
    Rubber to Glass
    Fed. Spec. TT-S-00230
    Fed. Spec. TT-S-001543
    ASTM C920 Type S Grade NS Class 25Clear (Clear)Canada75075A711000000

    Caulk

    Caulk is non-sagging, so it 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 a sealant can sustain. Caulk is best suited to joints between similar materials that aren't exposed to wide temperature fluctuation.
    Acrylic PlasticAbout Acrylic Plastic
    Image of Product. Front orientation. Sealants. Caulk, Cartridge.

    Cartridge

    Each
    Begins to
    Harden, min.
    Reaches Full
    Strength, day
    Elongation
    Joint Compression/Expansion
    Tolerance
    Tensile
    Strength
    Hardness
    Rating
    Temp. Range,
    ° F
    Mil. Spec.
    Specs. Met
    For Joining
    Choose a Color
    1-11
    12-Up
    10.1 fl. oz. Cartridge
    603500%-50% to 50%Not RatedNot Rated-20 to 180Fed. Spec. TT-S-00230ASTM C920 Type S Grade NS Class 25Masonry
    Metal
    Wood
    Almond, Black, Brown, Clear, Gray, White7640T50000000000
     

    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.
    Silicone Rubber
    Image of Product. Front orientation. Sealants. HVAC Sealants.
    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
    9.4Cartridge2024Not Rated-25% to 25%Not RatedSoft (Durometer 26A)-60 to 400Fed. 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)1919N1600000

    Structural Noncorrosive Silicone Rubber Sealants

    Image of Product. Front orientation. Sealants. Structural Noncorrosive Silicone Rubber Sealants, Cartridge.
    Image of Product. Front orientation. Sealants. Structural Noncorrosive Silicone Rubber Sealants, Sausage Pack.

    Cartridge

    Sausage Pack

    Also known as neutral cure, this sealant won't discolor copper, brass, and concrete. It is a structural sealant that combines the mechanical strength of an adhesive with excellent sealing properties and high flexibility. It’s non-sagging, so it won't drip from vertical and overhead surfaces. Made from silicone rubber, this sealant is RTV (room-temperature vulcanizing).
    Elongation and joint compression/expansion tolerance indicate flexibility—the higher the values are, the more joint movement a sealant can sustain. This sealant is best suited to joints between similar materials that aren't exposed to wide temperature fluctuation.
    Container
    Temp.,
    ° F
    Mfr. Model
    No.
    Size, fl.
    oz.
    Type
    Begins to
    Harden, min.
    Reaches Full
    Strength, day
    Elongation
    Joint Compression/Expansion
    Tolerance
    Tensile Strength,
    psi
    Hardness Rating
    Min.
    Max.
    For
    Joining
    Primer Req.
    for Use On
    Color
    (Clarity)
    Each
    Dow Silicone Rubber
    99510.3Cartridge6514525%-50% to 50%350Medium Soft (Durometer 40A)-40300MetalAluminum
    Black (Opaque)7436A41000000
    99520Sausage Pack6514525%-50% to 50%350Medium Soft (Durometer 40A)-40300MetalAluminum
    Black (Opaque)7436A3800000
     
    Sealant Primers
    back to top