Gasket Sealants
Verified by Mel Sykes, Industrial Supply Chain Specialist - April 2026
| Specification | Details |
|---|---|
| Types | RTV silicone, anaerobic (flange sealant), PTFE tape, liquid gasket |
| Brands | Loctite 518/574 (anaerobic), Permatex, Hylomar, Dow Corning |
| Temp range | -55C to +343C (depending on type) |
| Standards | MIL-S-46163 (some formulations) |
What are Gasket Sealants?
Gasket sealants are specialized adhesives and sealants used to create a leak-proof barrier between mating surfaces in mechanical joints. They ensure that no gases or fluids can escape from the joint, maintaining system integrity.Types and Variants
There are several types of gasket sealants, each with unique properties tailored for specific applications:- RTV Silicone: These sealants form a flexible rubber-like material after curing. Common brands include Permatex Ultra Gray RTV and Hylomar G12.
- Anaerobic Sealant (Flange Sealant): Formulations like Loctite 518/574 are designed to cure in the absence of air, bonding only where it's needed. These sealants can withstand temperatures up to +343°C and resist pressure up to 690 bar.
- PTFE Tape: This tape is wound around threads for sealing pipe connections. It's available from brands such as Hylomar PTFE White Tape.
- Liquid Gasket: Liquid gaskets are applied like paint and dry into a solid, rubbery material. Examples include Dow Corning 3179, which has dimensions of approximately 20mm thickness when fully cured.
Materials and Specifications
Gasket sealants come in various materials to suit different environmental conditions:- RTV Silicone: Made from silicone elastomers, these sealants adhere well across a range of temperatures (-55°C to +343°C) and resist chemicals.
- Anaerobic Sealant (Flange Sealant): These are typically based on acrylic chemistry. They meet military standard MIL-S-46163 for compatibility with metals and resistance to vibration and pressure fluctuations.
- PTFE Tape: PTFE tape is made from polytetrafluoroethylene, which is inert and non-stick. It's ideal for sealing pipe connections in high-pressure systems.
Selection Criteria
Choosing the right gasket sealant involves considering several factors:- Temperature Range: Ensure the sealant can withstand the operating temperature of your system. For instance, Loctite anaerobic sealants are suitable for high-temperature environments.
- Pressure Rating: Verify that the sealant will hold under the pressure conditions expected in your application. Liquid gaskets like Dow Corning 3179 have excellent load-bearing capabilities.
- Chemical Resistance: Some sealants resist specific chemicals better than others. For example, RTV silicones are great for sealing joints exposed to oils and fuels.
- Application Method: Consider the ease of application. Anaerobic sealants cure automatically in metal gaps, while liquid gaskets need to be brushed or sprayed on.
UK Suppliers
MLC lists verified suppliers from Companies House that offer high-quality Gasket Sealants:- BTMA Members: Many UK manufacturers and distributors are members of the British Technical Manufacturers Association (BTMA), ensuring quality and reliability.
- BIAFD Affiliates: Suppliers affiliated with the British Industrial Adhesives & Fixings Distributors (BIAFD) provide a wide range of sealant options, backed by industry standards.
Common Applications
Gasket sealants find use in diverse applications across various industries:- Automotive Repair: Used to seal oil pans, radiator caps, and valve covers. Loctite 518/574 is popular for automotive flange sealing.
- Piping Systems: PTFE tape seals pipe threads in plumbing and HVAC systems. It's effective at preventing leaks and ensuring a tight connection.
- Engine Rebuilds: RTV silicone sealants are important for resealing cylinder heads, intake manifolds, and oil pans after engine disassembly.
By selecting the appropriate gasket sealant based on its properties and application requirements, engineers can ensure reliable sealing performance in their projects.
References
Frequently Asked Questions
What are Gasket Sealants?
Gasket Sealants are engineering components used in industrial applications. Browse verified UK suppliers on MLC.
Where can I buy Gasket Sealants in the UK?
MLC lists verified UK gasket sealants suppliers with Companies House data. Browse by product category or search by location.
What are Gasket Sealants and why are they important?
Gasket Sealants are specialized adhesives and sealants used to create a leak-proof barrier between mating surfaces in mechanical joints. They ensure that no gases or fluids can escape, maintaining system integrity and preventing leaks.
What types of gasket sealants are available for UK engineers?
Common types include RTV silicone, anaerobic (flange) sealant like Loctite 518/574, PTFE tape, and liquid gasket formulations. Each type is suited to different applications based on their properties.
How do I choose the right gasket sealant for a specific application?
Consider factors such as temperature range, chemical resistance, and pressure requirements. For instance, RTV silicone works well in environments with fluctuating temperatures, while anaerobic sealants like Loctite 518/574 excel at high pressures and temperatures up to +343°C.
What are the standard specifications for gasket sealants used in the UK?
Gasket Sealants often adhere to standards such as MIL-S-46163, which ensures they meet specific performance criteria. Checking these standards can help ensure compliance with industry requirements.
Which brands of gasket sealant are recommended for industrial use in the UK?
Popular brands include Loctite 518/574 (anaerobic), Permatex, Hylomar, and Dow Corning. These brands provide reliable products that meet stringent performance standards.
What is the temperature range for gasket sealants typically used in the UK?
Gasket Sealants can operate within a wide temperature range from -55°C to +343°C, depending on the type of sealant. Anaerobic formulations like Loctite 518/574 are particularly strong at high temperatures.
Where can I find gasket sealants in the UK and what is their availability?
Gasket Sealants can be found at various industrial supply stores and online platforms such as mlc.org.uk. Availability varies by brand and type, but most commonly used brands like Loctite are widely available.
How much do gasket sealants cost in the UK and where can I purchase them?
Prices for Gasket Sealants vary based on type, quantity, and brand. For instance, a tube of Loctite 518 costs around £4-6 depending on suppliers like mlc.org.uk or industrial supply stores. It's best to check online platforms for the most current pricing and availability.