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JB Weld Silicones

Silicone sealant shortages are addressed by JB Weld products as companies experience difficulties in the supply of silicone, especially businesses relying on Chinese suppliers

Supply issues will continue for some time in the manufacture of silicones and epoxies due to increased demand and the availability of raw materials.

However, US-based JB Weld does not have supply problems and the company's strong ties with its Australian distributor, HPP Lunds means the large range of JB Weld Silicones can remain on shelves now and into the future.

JB Weld does all its own blending, packaging and logistics so it has been able to maintain an exceptional supply rate. Additionally, the company has its own R&D department that quality checks every product batch to ensure its high level of quality is consistent and maintained.

JB Weld also recently competed a major expansion of its Texas manufacturing facility, an investment made to ensure it continues to meet the demand for products locally and internationally.

With confirmed factory support from JB Weld, HPP Lunds has been able to realise excellent fill rates on orders. At the same time, it has substantially increased inventory levels with many more containers ordered to ensure best possible supply rates for its customers.


JB Weld uses 100% silicone for its product range which is ideal for gaskets because it has very low shrinkage when cured, and the material remains compliant without being hard or brittle. It is also resistant to gas, diesel, oil and other automotive fluids, so it won't disintegrate over time.

Each type of RTV (Room Temperature Vulcanized) silicone - denoted by the differing colours - has its own characteristics that make one more suitable than another, depending on the application.

Ultimate Black RTV

Ultimate Black RTV is commonly used in OEM applications and has a higher resistance to heat with maximum oil resistance, high flexibility and it is sensor safe. Some items suited to Ultimate Black include sumps, valve covers, timing gear covers and transmission pans. Ultimate Black RTV is available in 85g tubes or 280ml cartridges.

Ultimate Grey RTV

Ultimate Grey RTV is for high torque uses like intake manifolds where high torque loads are applied to the sealant. This sealant is more flexible when cured and remains oil resistant. It is temperature resistant to 260ºC and is sensor safe. Ultimate Grey RTV is available in 85g tubes or 280ml cartridge.

Hi Temp Red RTV

Hi Temp Red RTV is designed for use in mechanical assemblies where the existence of higher, continuous temperatures up to 288ºC or 343ºC intermittent might exist. Upon curing, which occurs when the product is exposed to the moisture in air, the silicone forms a tough, waterproof seal on most surfaces. It will not shrink or crack, resists weathering, is sensor safe and ideal for many automotive applications. Hi Temp Red RTV is available in 85g tubes or 280ml cartridges.

Copper RTV

Copper RTV is three times more oil resistant than conventional silicones and designed to resist the high operating temperatures of turbocharged or high-performance engines. It is also designed for use in mechanical assemblies where high torque or closely spaced bolt profiles can lead to higher loads and cause gasket and sealing failures for average silicones. It is available in 85g tubes.

Blue RTV

Blue RTV is a general-purpose silicone. This product is not designed for high temperatures with uses including sumps and water pumps as it is waterproof, flexible and does not shrink. It is also very useful for mechanical assembly bonding of uneven surfaces. It is available in 85g tubes.

Black RTV

Black RTV is a general-purpose product used for sealing a variety of metals, rubber and glass. It has high flexibility and is waterproof and is also very useful for mechanical assembly bonding of uneven surfaces. It is available in 85g tubes.

White RTV

White RTV is a general-purpose silicone for use in mechanical assembly applications and forms a tough, waterproof, mildew and mould resistant seal. It is available in 85g tubes.

Clear RTV

Clear RTV is good to use where you don't want the product to be easily seen such as sealing windscreens. It works on ceramics, cloth, carpet, glass, rubber and metals. It is available in 85g tubes.

While JB Weld RTV silicone is ideal for permanent seals, it can also be used in applications where repeated removal is necessary such as valve covers. The trick is to apply the silicone and allow it to cure before installing the part. This makes a flexible seal that does not bond to the other surface; however, the right amount of silicone build-up must be used to make sure there is a proper seal in place.

For more information, visit the HPP Lunds website below or call (07) 3722 1111.

HPP Lunds, a leading independent wholesaler of automotive parts and accessories in Australia