McMaster-Carr logo
    Filter by
    Mixing Required
    Environment
    Mix Ratio
    DFARS Specialty Metals
    Export Control Classification Number (ECCN)
    Industrial Info Snippet
    Flammability Rating
    Industrial Info Compare
    Enter e-mail addresses in the fields below
    Message
    Cancel
    Comments
    E-mail address (if you would like a response)
    27 Products

    Two-Part Silicone Rubber Potting Compounds

    Encase electronic assemblies in a layer of silicone rubber for protection from dust, moisture, mechanical shock, and vibration. Softer and more flexible than epoxies and urethanes with the widest temperature range, silicone rubber potting compounds are the best choice for high-temperature applications and electronics exposed to thermal cycling. They have good moisture resistance but poor chemical and abrasion resistance. Silicones provide excellent electrical insulation. They’re also known as RTV (room-temperature vulcanizing).
    Cartridges
    Image of Product. Front orientation. Potting Compounds. Two-Part Silicone Rubber Potting Compounds, Cartridges.
    Cartridge potting compounds require a gun (sold separately) to dispense; use them with the included mixer nozzle.
    Dry Time
    Container
    Size, fl. oz.
    Consistency
    Touch,
    min.
    Overall,
    hr.
    Dielectric
    Strength
    Thermal Conductivity,
    W/(m⋅°C)
    Temp. Range,
    ° F
    For Use On
    Color
    Each
    Medium Soft
    1.7Thick Liquid2548Not Rated0.18-55 to 390Aluminum, Brass, Bronze, Copper, Steel, Stainless Steel, Plastic, Ceramic, GlassClear00000000000000
     
    Guns
    Cans and Tubes
    Image of Product. Front orientation. Potting Compounds. Two-Part Silicone Rubber Potting Compounds, Cans and Tubes.
    Dry Time
    Mfr. Model
    No.
    Container
    Size, fl. oz.
    Consistency
    Touch
    Overall,
    hr.
    Dielectric Strength,
    V/mil
    Thermal Conductivity,
    W/(m⋅°C)
    Temp. Range,
    ° F
    Specs. Met
    For Use On
    Color
    Each
    Momentive Potting Compounds—Medium Soft
    RTV1116Thick Liquid90 min.245150.29-65 to 400Fed. Spec. A-A-56023Aluminum, Brass, Bronze, Copper, Steel, Stainless SteelWhite000000000000000
     
    Momentive Potting Compounds—Medium Hard
    RTV6016Thick Liquid2 hr.244500.31-65 to 500Aluminum, Brass, Bronze, Copper, Steel, Stainless SteelRed00000000000000
     

    Ready-to-Use Silicone Rubber Potting Compounds

    Image of Product. Front orientation. Potting Compounds. Ready-to-Use Silicone Rubber Potting Compounds, Tube.
    Image of Product. Front orientation. Potting Compounds. Ready-to-Use Silicone Rubber Potting Compounds, Cartridge.

    Tube

    Cartridge

    No mixing required—these potting compounds come ready to apply. 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, silicone rubber potting compounds are the best choice for high-temperature applications and electronics exposed to thermal cycling. They have good moisture resistance but poor chemical and abrasion resistance. Silicones provide excellent electrical insulation. They're also known as RTV (room-temperature vulcanizing) compounds because they don’t need heat or UV light to cure.
    UL 94 V-0—Potting compounds that meet UL 94 V-0 have passed a test for flame retardance.
    Cannot Be Sold to California—Potting compounds that cannot be sold to California exceed local regulatory limits on VOCs (volatile organic compounds).
    Cannot Be Sold to Canada—Potting compounds that cannot be sold to Canada are restricted by product labeling requirements.
    Container
    Dry Time
    Mfr. Model
    No.
    Size, fl.
    oz.
    Type
    Consistency
    Touch
    Overall,
    hr.
    Dielectric Strength,
    V/mil
    Thermal Conductivity,
    W/(m⋅°C)
    Temp. Range,
    ° F
    Certification
    Mil. Spec.
    Flammability
    Rating
    For Use On
    Color
    Clarity
    Cannot Be
    Sold To
    Each
    Dow Potting Compounds—Medium Soft
    7383TubePaste90 min.24475Not Rated-45 to 390UL Listed, UL Recognized Component, Mil. Spec.MIL-A-46146UL 94 HB
    Aluminum, Copper, Steel, Plastic, Rubber, FiberglassWhiteOpaque0000000000000
    73810.1CartridgePaste90 min.24475Not Rated-45 to 390UL Listed, UL Recognized Component, Mil. Spec.MIL-A-46146UL 94 HB
    Aluminum, Copper, Steel, Plastic, Rubber, FiberglassWhiteOpaque000000000000
     
    Dow Potting Compounds—Soft
    316510.3CartridgePaste4 min.24500Not Rated-45 to 390UL 94 V-0
    Aluminum, Brass, Bronze, Copper, Steel, Stainless Steel, GlassGrayOpaque000000000000
    7483TubePaste30 min.24475Not Rated-65 to 350UL 94 HB
    Aluminum, Brass, Bronze, Copper, Steel, Stainless Steel, Titanium, Plastic, Rubber, Composite, Fiberglass, GlassOff-WhiteOpaque00000000000000
    74810.1CartridgePaste30 min.24475Not Rated-65 to 350UL 94 HB
    Aluminum, Brass, Bronze, Copper, Steel, Stainless Steel, Titanium, Plastic, Rubber, Composite, Fiberglass, GlassOff-WhiteOpaque00000000000000
    8383TubePaste45 min.24Not RatedNot Rated-45 to 390UL Listed, UL Recognized Component
    UL 94 HB
    Aluminum, Brass, Bronze, Copper, Steel, Stainless Steel, Titanium, Plastic, Rubber, Composite, Fiberglass, Ceramic, GlassWhiteOpaque000000000000
    83910.3CartridgePaste35 min.24Not RatedNot Rated-45 to 390Aluminum, Brass, Bronze, Copper, Steel, Stainless Steel, Titanium, Plastic, Rubber, Composite, Fiberglass, Ceramic, GlassBlueSemi-Clear000000000000
     
    Loctite® Potting Compounds—Soft
    51453TubeThick Liquid2 min.724500.2-45 to 390Mil. Spec.MIL-A-46146Aluminum, Brass, Bronze, Copper, Steel, Stainless Steel, Plastic, Ceramic, GlassWhiteSemi-Clear000000000000
    514510.1CartridgeThick Liquid2 min.724500.2-45 to 390Mil. Spec.MIL-A-46146Aluminum, Brass, Bronze, Copper, Steel, Stainless Steel, Plastic, Ceramic, GlassWhiteSemi-Clear0000000000000
     
    Momentive Potting Compounds—Soft
    RTV1622.8TubePaste4 hr.484500.2-75 to 400UL Recognized Component, Mil. Spec.MIL-A-46146Aluminum, Brass, Bronze, Copper, Steel, Stainless Steel, Plastic, Rubber, Ceramic, GlassWhiteOpaqueCalifornia0000000000000
    RTV16210.1CartridgePaste4 hr.484500.2-75 to 400UL Recognized Component, Mil. Spec.MIL-A-46146Aluminum, Brass, Bronze, Copper, Steel, Stainless Steel, Plastic, Rubber, Ceramic, GlassWhiteOpaqueCalifornia0000000000000
     
    Compounds—Soft
    3TubePaste15 min.244250.06-75 to 400UL 94 HB
    Aluminum, Brass, Bronze, Copper, Steel, Stainless Steel, Plastic, Ceramic, GlassClearClearCanada0000000000000
    10.1CartridgePaste10 min.24450Not Rated-70 to 400Mil. Spec.MIL-A-46106Aluminum, Brass, Bronze, Copper, Steel, Stainless Steel, Silver, Plastic, Rubber, GlassBlackOpaque0000000000000
     

    Optically Clear Two-Part Silicone Rubber Potting Compounds

    Image of Product. Front orientation. Potting Compounds. Optically Clear Two-Part Silicone Rubber Potting Compounds, Cartridge, Loctite®.
    Image of Product. Front orientation. Potting Compounds. Optically Clear Two-Part Silicone Rubber Potting Compounds, Bottle.

    Loctite®

    Cartridge

    Bottle

    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).
    Cartridge—Compounds in a cartridge come with a mixer nozzle for precise application. You need a gun (sold separately) to dispense.
    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.
    Thick Liquid and Thin Liquid—Liquid compounds harden around your component to form a strong, durable, and permanent layer of protection.
    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.
    Mfr. Model
    No.
    Container
    Size
    Consistency
    Touch
    Overall
    Mixer Nozzle
    Included
    Mix
    Ratio
    Dielectric Strength,
    V/mil
    Thermal Conductivity,
    W/(m⋅°C)
    Temp. Range,
    ° F
    Enclosure
    Rating
    Certificate Type
    Environment
    For Use On
    Color
    Clarity
    Each
    Loctite® Cartridge Potting Compounds—Soft
    562013.5 fl. oz.Thin Liquid2030Yes1:15300.16-65 to 390Material Certificate with Traceable Lot Number and Product Shelf Life
    Aluminum, Brass, Bronze, Copper, Steel, Stainless Steel, Silver, Titanium, Plastic, Composite, FiberglassClearClear000000000000000
     
    Momentive Bottle Potting Compounds—Medium Soft
    RTV6151 lb.Thick Liquid606010:15000.19-75 to 400Aluminum, Brass, Bronze, Copper, Steel, Stainless Steel, Silver, Titanium, Plastic, Composite, FiberglassClearClear00000000000000
     
    Bottle Potting Compounds
    10.1 fl. oz.Gel15151:15000.2-75 to 355IP68
    Dusty, SubmersibleAluminum, Brass, Bronze, Copper, Steel, Stainless Steel, Silver, Titanium, Plastic, Composite, FiberglassClearClear0000000000000
     
    Accessories for Potting Compounds

    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-Clear0000000000000
    33.8Gel15151:15000.2-75 to 390IP68
    Dusty, SubmersibleAluminum, Brass, Bronze, Copper, Steel, Stainless Steel, Titanium, Plastic, Rubber, Composite, Fiberglass, Ceramic, GlassBlueSemi-Clear000000000000
     
    Cartridge Potting Compounds
    9.4Gel5000.2-75 to 390IP68
    Dusty, SubmersibleAluminum, Brass, Bronze, Copper, Steel, Stainless Steel, Titanium, Plastic, Rubber, Composite, Fiberglass, Ceramic, GlassClearClear000000000000
     

    Light-Activated Silicone Rubber Potting Compounds

    Image of Product. Front orientation. Potting Compounds. Light-Activated Silicone Rubber Potting Compounds.
    These compounds dry quickly when exposed to UV light allowing you to handle the potted items sooner. Made of silicone rubber, they’re softer and more flexible than epoxy or urethane compounds, so they’re better at protecting against shocks and vibration. They also withstand a wider range of temperatures, so they’re often used with electronics that heat and cool rapidly. These compounds are excellent electrical insulators, and they’ll shield your components from moisture and dust. However, they don’t hold up well to abrasion or chemicals. The tapered nozzle lets you apply them precisely.
    Dry Time
    Mfr. Model
    No.
    Container
    Size, fl. oz.
    Consistency
    Touch,
    sec.
    Overall,
    hr.
    Light Intensity Req.
    to Reach Full Strength
    Cure
    Type
    Dielectric Strength,
    V/mil
    Thermal
    Conductivity
    Temp. Range,
    ° F
    Certification
    For Use On
    Color
    Clarity
    Each
    Loctite® Cartridge Potting Compounds—Soft
    509110 1/10Thick Liquid202460 sec. @ 40 mW/cm²UV Light450Not Rated-65 to 350UL Recognized Component
    Aluminum, Brass, Bronze, Copper, Steel, Stainless Steel, Silver, Titanium, Plastic, Composite, FiberglassWhiteSemi-Clear00000000000000
     

    Low-Outgassing Optically Clear Two-Part Silicone Rubber Potting Compounds

    Image of Product. Front orientation. Potting Compounds. Low-Outgassing Optically Clear Two-Part Silicone Rubber Potting Compounds.
    Tested to meet ASTM E595, a standard used by NASA, these compounds produce almost no volatile emissions that could damage sensitive electronics, even in a vacuum. Light passes through them easily, so they’re ideal for protecting solar cells and fiber optics. Made of silicone rubber, these compounds are softer and more flexible than epoxy and urethane compounds. That means they’re better at protecting against shocks and vibration. They also withstand a wider range of temperatures, so you can use them with electronics that heat and cool rapidly. These compounds are excellent electrical insulators, and they’ll shield your components from moisture and dust. However, they don’t hold up well to chemicals or scrapes. They’re also known as RTV (room-temperature vulcanizing).
    These compounds are easy to apply in high volumes. Just mix the two parts together and pour them over components inside a container, such as a potting box.
    Dry
    Time, hr.
    Container
    Size, fl. oz.
    Consistency
    Touch
    Overall
    Mix
    Ratio
    Dielectric Strength,
    V/mil
    Thermal Conductivity,
    W/(m⋅°C)
    Temp. Range,
    ° F
    Specs.
    Met
    For Use On
    Color
    Clarity
    Each
    Bottle Potting Compounds—Medium Soft
    4.1Thick Liquid32410:14750.2-45 to 390ASTM E595Aluminum, Brass, Bronze, Copper, Iron, Steel, Silver, Fiberglass, GlassClearClear0000000000000000
     
    back to top