Leak Lock® Pipe Joint Sealant

Leak Lock® is a thread sealant that prevents leaking of nearly all fluid substances. It’s suitable as a gasket sealing compound and can also prevent loosening of nuts, bolts, plugs, fittings, and other parts. As a sealant paste, it stays flexible after cured, adheres to surfaces, fills voids, and is potable water safe once cured. It works in temperatures from -200°F (-93°C) to 400°F (204°C), as well as full vacuums and pressures to 10,000 psi.

SKU: leak-lock-pipe-joint-sealant Category:


1.3 oz tube Item# 10001 – 12 per Canister
1.3 oz tube Retail Item#10002 – 12 per Case
4 oz Bottle w/ Brush top Item#10004 – 12 per Case
16 oz Bottle w/ Brush top Item#10016 – 12 per Case

Leak Lock® is an all-purpose, high-strength and versatile sealant used to prevent leaks, while maintaining its flexibility and adhesion under nearly all pressure and elemental forces. Suitable for use on all clean surface types.


A sealant for all surfaces, including metals, plastics, and silicones. Seals a vast range of chemicals, CFCs, HFCs, oils, gases, steam, water, air, etc. Ideal for joining dissimilar metals and other materials.*

*Note: If unsure about whether Leak Lock will work for you, please contact us.

How to Use

Clean Surface: Clean the surface with acetone or another suitable solvent.

Apply: Apply with a brush or other applicator to both sealing surfaces.

Wait: Wait 20 minutes for a tack time to develop before joints are assembled.

Cure: Cure time will vary from 20 minutes to 24 hours, depending on pipe size and temperature of application.**

For Removal: Use any denatured alcohol as a cleaning solvent to remove unwanted spills or mess.

**Actual set times are dependent on pipe size and ambient temperature, but generally are as follows: 0 to 1/2″ = 1 to 2 hours; 1/2″ to 1 1/2″ = 4 to 6 hours; 2″ to 4″ = overnight.


Product PDF

How to use it?

Leak Lock® should be applied to clean joint surfaces, either with the applicator brush or any convenient spatula. Apply Leak Lock® to both mating surfaces. A twenty-minute tack time should be allowed to develop before joints are assembled.

Typical Physical Properties

  • Viscosity …… 25,000-100,000 cps
  • Consistency …… flowable Paste
  • Color …… light Blue
  • Solvent …… ethanol and isopropanol
  • Pressure …… full vacuum to 10,000 psi
  • Temperature …… -200°F to +400°F
  • Toxicity …… non-toxic
  • Shelf Life …… Indefinite when kept Sealed
  • Material Safety Data Sheet is available from Highside or can be downloaded from our web site:
  • http://www.highsidechem.com

Leak Lock: Successes – The following is a partial list of the materials and fluids that Leak Lock has successfully sealed:


  • R-717 (ammonia)
  • R-744 (carbon dioxide)
  • R-11 (trichlorofluromethane)
  • R-12 (dichlorodifluromethane)
  • R-21 (dichlorofluromethane)
  • R-22 (chlorodifluromethane)
  • R-113 (1, 2-trichlorotrifluroethane)
  • R-114 (1,2-dichlorotetrafluroethane)
  • R-40 (methyl chloride)
  • R-30 (methylene chloride)
  • R-290 (propane)
  • R-764 (sulfur dioxide)
  • R-134a (1,1,2-tetrafluroethane)
  • R-13, R-13BL, R-500, R-502, R-503, R-123, R-124, R-401A, R-401B, R-402A, R-402B, R-403B, R-406A, R-408A, R-409A, R-23, R-236FA, R-404A, R407A,R-407B, R-407C, R-410A, R-507, R-508.


  • Natural Gas
  • LPG “Liquefied Petroleum Gas”
  • LNG “Liquefied Natural Gas”
  • Propane
  • n-Butane
  • Isobutane


  • Gasoline (petrol; motor fuel)
  • Aviation Fuels (avgas; jet fuel)
  • Fuel Oils
  • Diesel Fuel Oils
  • Gas Turbine Oils
  • Hydrazine*
  • Kerosene
  • Gas Oil


  • Mineral Oils, Napthenic
  • Mineral Oils, Paraffinic
  • Polyol Esters
  • Polyalphaolefins
  • Alkylbenzenes


  • Water (soft;hard;potable)
  • Seawater (saltwater)
  • Deionized Water
  • Pentane
  • Hexane
  • Cyclohexane
  • Heptane
  • Petroleum Napthas
  • Mineral Spirits
  • Acetone
  • Toluene
  • Xylene
  • Perchloroethylene
  • D-Limonene
  • Turpentine
  • Pine Oil
  • Lacquer Diluent
  • Rubber Solvent
  • VM&P Naptha
  • Stoddard Solvent
  • 140šF Solvent
  • Deodorized Kerosene
  • Medium-Flash Aromatic Naptha
  • High-Flash Aromatic Naptha
  • Dipentene
  • Methylene Chloride
  • 1,1,1-Trichloroethane
  • 2-Nitropropane
  • Orthodichlorobenzene
  • Monochlorobenzene
  • Chloroform
  • Ethylene Dichloride
  • Trichlorethylene
  • Propylene Dichloride
  • Aliphatic Solvents
  • Acids, Dilute
  • Caustics, Dilute
  • Aromatic Solvents
  • Glycerine
  • Chlorinated solvent


  • Acetylene
  • Chlorine, anhydrous
  • Air
  • Carbon Monoxide
  • Ammonia, anhydrous
  • Argon
  • n-Butane
  • Carbon Dioxide
  • Ethane
  • Ethylene Chloride
  • Fluorine
  • Hydrogen
  • Methane
  • Neon
  • Nitrogen
  • Nitrous Oxide
  • Oxygen (Industrial Only)
  • Propane
  • Propylene
  • Silane
  • Xenon
  • Tetrafluoromethane
  • Helium


  • Mineral Oils
  • Soybean Oil
  • Coconut Oil
  • Tall Oil
  • Peanut Oil
  • Rapeseed Oil
  • Menhaden Oil
  • Vegetable Oil
  • Animal Oil
Leak Lock is not recommended for use with alcohols.

CURE TIME: Leak lock will cure and be ready for service in as little as 20 minutes or no more than 24 hours depending on pipe size and temperature of application.

Actual set times are dependent on pipe size and ambient temperature, but generally are as follows: 0 to 1/2″ = 1 to 2 hours; 1/2″ to 1 1/2″ = 4 to 6 hours; 2″ to 4″ = overnight. Use denatured alcohol as a cleaning cleansing solvent prior to setting and for clean-up



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