What is the material of ASBESTOS FREE GASKET (NON ASBESTOS GASKET)? How many degrees of heat resistance?
ASBESTOS FREE GASKET or NON ASBESTOS GASKET in Europe and America generally refers to 100% asbestos free gaskets. Translated into Chinese, it can be said as “non-asbestos gasket” or “non-asbestos gasket”, but some companies in the Chinese market will contain a certain amount of asbestos (5-20%) gaskets called non-asbestos gaskets, while 100% asbestos-free gaskets called non-asbestos gaskets. In view of this special situation, we hereby reiterate that all gaskets handled by SealTex are non-asbestos gaskets without any asbestos content.
What are the main materials of asbestos gaskets?
Asbestos-free gasket is a kind of sealing gasket made of environmentally friendly stone-free gasket material as profile stamping, which can replace the traditional asbestos gasket products. The main materials of environmentally friendly non-asbestos gasket materials are reinforcing fibers (plant fibers, cork, inorganic fibers, etc.), binders and fillers, etc., which play different roles inside the gasket, and different combinations of reinforcing fibers, binders and fillers can be combined with each other to form different gasket materials.
1. Reinforcing fibers: commonly used inorganic fibers are aramid fibers, carbon fibers, glass fibers, etc., which can provide tensile strength and structural stability.
Commonly used aramid fiber as a reinforcing fiber gasket material model ST-2058, AFM34, CSA-90
Carbon fiber reinforced: NA-1100, ST-2062
Glass fiber reinforced models: ST-2063, C4430, etc.
2. Fillers: graphite, mica, mineral powder, etc., fillers can enhance the sealing and temperature and corrosion resistance; commonly used graphite-filled non-asbestos gasket material models are ST-2060, novatec HPN, ST-2067, etc.
3. Binder (elastomer base material) Commonly used binders are: nitrile rubber (NBR), EPDM, chloroprene rubber (CR), styrene-butadiene rubber (SBR), and fluoroelastomer (FKM), etc., which can give the gasket elasticity and sealing adaptability;
Models of asbestos-free gasket materials with nitrile rubber as binder are ST-2046, ST-2058, ST-2052, etc.
Asbestos-free gasket materials with neoprene rubber as binder are MP-15.
Asbestos-free gaskets with styrene-butadiene rubber as binder include TS-9006, S-8091, TS-9013, NA-1035, AFM33/2, etc.
By adjusting the material ratio and process, non-asbestos gaskets can be adapted to different working conditions, such as oil resistance, acid and alkali resistance or high temperature resistance.
What is the heat resistance of asbestos-free gaskets?
The heat resistance of asbestos-free gaskets depends on the formulation and type of adhesive, with typical temperature ranges as follows:
1. Normal temperature type (cork rubber gasket, oil-resistant paper gasket, non-asbestos fiber paper gasket, etc.): the applicable temperature -29 ℃ to 180 ℃, suitable for general industrial pipelines, small through the machine, gearboxes, transmission equipment, etc.; commonly used models are: Flexoid, Fibreflex, TS1521, TD1049, ST-2136, N-8092, S-8091 and so on.
2. Medium and high temperature type (non-asbestos fiber rubber sheet, PTFE/modified PTFE sheet): usually used at a temperature of <250℃, commonly used models are ST-2028-39, ST-2058, AFM34, TF1570 modified PTFE sheet, 24SH expanded PTFE sheet and so on, suitable for gasoline engines, diesel engines, industrial pumps and valves, petrochemicals, compressors, heat exchangers, food, pharmaceuticals and other industries.
High-temperature type: with the help of graphite's high temperature resistance (oxygen-free environment can be resistant to 1600 ℃), the short-term temperature resistance of specially formulated gaskets even exceeded 500 ℃, but long-term use is recommended to be controlled at 400 ℃ or less; the middle of the metal lining can also be enhanced to enhance its performance, the process is divided into punching and bonding, corresponding to the Department of the model ST-9926, ST-9916, ST-2067, novaform SK, etc. They are suitable for exhaust ports, ships, superchargers, and all kinds of special equipments.
Ultra-high temperature type: ceramic fiberboard: BARLON 850,1200,1100bio, ISOPLAN750, temperature resistant 750~1250℃. Commonly used in steel, boiler, burner and other industries
Mica composite plate ST-4376,ST-4976, high temperature resistance 700-1000℃, commonly used in turbocharger, aviation engines and other high temperature and high pressure occasions.
It should be noted that sustained high temperature will lead to elastomer aging, and long-term over-temperature may cause gasket hardening, shrinkage or failure, so it needs to be knotted.
Translated with DeepL.com (free version)
What are the main materials of asbestos gaskets?
Asbestos-free gasket is a kind of sealing gasket made of environmentally friendly stone-free gasket material as profile stamping, which can replace the traditional asbestos gasket products. The main materials of environmentally friendly non-asbestos gasket materials are reinforcing fibers (plant fibers, cork, inorganic fibers, etc.), binders and fillers, etc., which play different roles inside the gasket, and different combinations of reinforcing fibers, binders and fillers can be combined with each other to form different gasket materials.
1. Reinforcing fibers: commonly used inorganic fibers are aramid fibers, carbon fibers, glass fibers, etc., which can provide tensile strength and structural stability.
Commonly used aramid fiber as a reinforcing fiber gasket material model ST-2058, AFM34, CSA-90
Carbon fiber reinforced: NA-1100, ST-2062
Glass fiber reinforced models: ST-2063, C4430, etc.
2. Fillers: graphite, mica, mineral powder, etc., fillers can enhance the sealing and temperature and corrosion resistance; commonly used graphite-filled non-asbestos gasket material models are ST-2060, novatec HPN, ST-2067, etc.
3. Binder (elastomer base material) Commonly used binders are: nitrile rubber (NBR), EPDM, chloroprene rubber (CR), styrene-butadiene rubber (SBR), and fluoroelastomer (FKM), etc., which can give the gasket elasticity and sealing adaptability;
Models of asbestos-free gasket materials with nitrile rubber as binder are ST-2046, ST-2058, ST-2052, etc.
Asbestos-free gasket materials with neoprene rubber as binder are MP-15.
Asbestos-free gaskets with styrene-butadiene rubber as binder include TS-9006, S-8091, TS-9013, NA-1035, AFM33/2, etc.
By adjusting the material ratio and process, non-asbestos gaskets can be adapted to different working conditions, such as oil resistance, acid and alkali resistance or high temperature resistance.
What is the heat resistance of asbestos-free gaskets?
The heat resistance of asbestos-free gaskets depends on the formulation and type of adhesive, with typical temperature ranges as follows:
1. Normal temperature type (cork rubber gasket, oil-resistant paper gasket, non-asbestos fiber paper gasket, etc.): the applicable temperature -29 ℃ to 180 ℃, suitable for general industrial pipelines, small through the machine, gearboxes, transmission equipment, etc.; commonly used models are: Flexoid, Fibreflex, TS1521, TD1049, ST-2136, N-8092, S-8091 and so on.
2. Medium and high temperature type (non-asbestos fiber rubber sheet, PTFE/modified PTFE sheet): usually used at a temperature of <250℃, commonly used models are ST-2028-39, ST-2058, AFM34, TF1570 modified PTFE sheet, 24SH expanded PTFE sheet and so on, suitable for gasoline engines, diesel engines, industrial pumps and valves, petrochemicals, compressors, heat exchangers, food, pharmaceuticals and other industries.
High-temperature type: with the help of graphite's high temperature resistance (oxygen-free environment can be resistant to 1600 ℃), the short-term temperature resistance of specially formulated gaskets even exceeded 500 ℃, but long-term use is recommended to be controlled at 400 ℃ or less; the middle of the metal lining can also be enhanced to enhance its performance, the process is divided into punching and bonding, corresponding to the Department of the model ST-9926, ST-9916, ST-2067, novaform SK, etc. They are suitable for exhaust ports, ships, superchargers, and all kinds of special equipments.
Ultra-high temperature type: ceramic fiberboard: BARLON 850,1200,1100bio, ISOPLAN750, temperature resistant 750~1250℃. Commonly used in steel, boiler, burner and other industries
Mica composite plate ST-4376,ST-4976, high temperature resistance 700-1000℃, commonly used in turbocharger, aviation engines and other high temperature and high pressure occasions.
It should be noted that sustained high temperature will lead to elastomer aging, and long-term over-temperature may cause gasket hardening, shrinkage or failure, so it needs to be knotted.
Translated with DeepL.com (free version)
