198152, St. Petersburg,
st. Krasnoputilovskaya,
5 letter A, pom. 15Н, office 510

+7 (812) 922-49-19
Сompany presentation 1,4 mb

Сountry of origin Great Britain
Brand Hylomar
Use A Room Temperature Vulcanising (RTV) general purpose silicone sealant
Appearance Non-setting paste
Colour Clear
Temperature range From -40° C to + 240° C
Product Sizes 40 ml Blister Card, 40 ml carton
Instructions for use Surface should be clean, dry and free from contamination such as oil or grease. Once applied in Gasket applications, the joint should be assembled without delay

Hylomar Ltd manufactures a wide range of high performance sealants and adhesives used by many of the leading OEM’s in the world of automotive, aerospace, white goods, power generation/distribution, electronics/photonics and general engineering. Hylomar products are also widely used and respected in the automotive, aerospace and industrial aftermarkets with Hylomar Universal Blue and Hylomar M (Light, Medium, Heavy) being the leading non-setting gasket & jointing compounds in the world. Hylomar Aerograde, Aerograde Ultra and Advanced Formulation are specified by various aero-engine manufacturers; including Rolls-Royce and Pratt & Whitney. Hylomar Aerograde is also specified by NATO.

Hylosil Instant Gasket is a Room Temperature Vulcanising (RTV) general purpose silicone sealant. Once applied the compound reacts with atmospheric moisture, to form a tough, durable rubber seal. It has excellent adhesion to metals, glass, ceramics and plastics. The compound has large gap filling properties which makes it ideal for application to non-machined surfaces and even as cast surfaces.

Hylosil Instant Gasket is resistant to oil, water and lubricants. It will remain flexible to withstand vibration. 


  • Room temperature vulcanising (RTV) silicone compounds
  • High-performance engineering grade sealants
  • Used in the automotive industry and for original equipment manufacturing
  • Can also be used for a variety of applications
  • Particularly suitable for high strength applications
  • Good resistance to oils and aqueous anti-freeze agents.

Typical Physical Properties

Product Colour Cure System Skin Time (Mins) @
23°C & 60% RH
Temp Range Extrusion Rate
3mm orifice @60PSI
Elongation at
Instant Gasket Clear Acetoxy 6 -40°C to +240°C 78g/min 1.9N/mm² 460% 22°

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