Power transmission and transformation equipments Sealings solution

Oil leakage & Air leakage Solution

electricity ransformers, Capacitors, hollow Insulators, Open Circuit Breakers, GIS Tank Circuit Breakers

O rings/seals/gaskets manufacturer - Prevents oil & air leakage

O rings/Seals supplier, SEALS Material：EPDM、NBR、HNBR、CR、FKM,VMQ、FVMQ、FPM、FEPM、FFKM...

Questions for Electricity Equipments SEALS

Technical Support：lilychin@vip.163.com

what material use for transformer seals manufacturing?

Common materials used for transformer seals/gaskets manufacturing include:

Rubber - Rubber is a widely used seal material in transformers. It has good elasticity, durability and heat resistance. Common types include EPDM rubber, silicone rubber, neoprene rubber, etc.

Paper - Paper gaskets are used in some transformers, especially for low-pressure seals. Crepe paper and vulcanized paper gaskets are commonly used. They are non-conductive and inexpensive.

Cork - Cork is also used to make gaskets in some transformers. It is elastic, compressible and helps absorb vibration. Cork gaskets have good chemical resistance and electrical insulation.

Fabric - Fabric materials like fiberglass, Nomex, Dacron, etc. are used as seal fabrics and to make gasket sheets for transformers. They have good strength and electrical properties. Often impregnated with rubber or resins.

Mica - Mica is used in gaskets for high-temperature areas in transformers like bushings. It can withstand over 1000°C and has excellent electrical insulation.

Compressed fiber - Compressed fiber gasket sheets made of plant fibers like kraft paper are used in transformers. They are rigid, non-conductive and chemically resistant.

PTFE - Polytetrafluoroethylene (PTFE) materials are often used in gaskets for transformer valves and some special areas. PTFE has the highest chemical and temperature resistance.

Ceramic - Ceramic materials are used in some high-voltage transformer bushings and other areas subjected to extreme conditions. Alumina ceramics can withstand over 2000°C.

Composite - Composite gaskets made of a combination of above materials, such as rubber-fiber, rubber-cork are also commonly used in transformers. They have combined properties of multiple materials.

Metals like copper, steel and aluminum are rarely used in seals directly facing transformer oil due to corrosion concerns. They may be used as metal mesh in composite gaskets or in other less corrosive areas.

Could you tell me about the types of transformer rubber？

Sure, here are some common types of rubber used for transformer seals/gaskets:

EPDM (Ethylene Propylene Diene Monomer) rubber - EPDM is a popular seal material for transformers. It has good heat, chemical and weather resistance. Can withstand up to 150°C. It is often used for manhole gaskets, handhole gaskets, etc.

Silicone rubber - Silicone rubber has high temperature resistance, up to 200-300°C. It is mainly used in high-temperature areas like radiator seals, valve seals, bushing seals, etc. Silicone can also resist aging and weathering.

Neoprene rubber - Neoprene is a synthetic chlorinated rubber with moderate oil/solvent resistance and durability. It can withstand up to 100°C. Used for gaskets like tank covers, cabinet door seals, etc.

Fluorocarbon rubber (FKM) - FKM or Viton has the best chemical resistance and can withstand over 200°C. It is typically used for transformer valve seals, drain plug seals, and in other corrosive or high-temperature environments.

Butadiene rubber (BR) - BR or nitrile rubber has good oil resistance and durability. Maximum temperature is around 110°C. It is often used for tank cover gaskets, manhole gaskets, and seals in less harsh areas.

Chlorosulfonated polyethylene (CSM) - CSM is a synthetic rubber with high weather and chemical resistance. Can withstand up to 120°C. Used mainly for outdoor cabinet seals, manhole/handhole seals, etc.

Polyurethane (PU) rubber - PU rubber has various hardness and good oil/solvent resistance. Maximum temperature depends on type, around 90-130°C. Used for cabinet seals, terminal box seals, etc.

Other specialty materials - Specialty rubbers like chloroprene (CR), urethane rubber (U), polyacrylate rubber (ACM), etc. are used for some specific and demanding transformer seal applications.

Rubber material selection depends on the transformer area, exposure temperature, weather conditions, chemical environment and other factors. Proper rubber type helps maximize the seal performance and service life.

can you tell me the sealing parts keywords used for electrical equipments？

Gaskets - Gaskets are used to seal two surfaces, like covers and housings. Common types for electrical equipment include rubber gaskets, fiber gaskets, sheet gaskets, etc.

O-rings - O-rings are circular seals used in grooves to prevent leakage. They are widely used in electrical connectors, cable glands, etc.

Sealing washers - Sealing washers or bonded washers are used under bolt heads and nuts to seal in fluids and prevent leakage. Common materials are rubber, silicone, etc.

Diaphragms - Diaphragms are flexible sealing parts usually used in actuating elements. Rubber or plastic diaphragms are used in some electrical switches and valves.

Bushings - Bushings are used to seal around shafts while allowing rotation. They are used in some electrical motors, pumps, etc. Common materials are carbon, rubber, etc.

Cord/braided seals - Flexible cord or braided seals are used where sealing and easy installation/removal are important. Used in some electric cables, wires, etc.

Tabs - Sealing tabs or tabs are flexible projections used to seal irregular surfaces or holes. Used in some electrical enclosures, boxes, etc.

Boots - Protective sealing boots are used to seal and protect flexible elements like rod ends, ball joints, cables, etc. Made of rubber, plastics, etc. Used in various electric equipment.

Bellows - Bellows are flexible seals used where sealing is required along with relative motion between two parts. Used in some electrical switches, motors, instruments, etc.

Packing - Seal packing refers to soft sealing materials used in stuffing boxes to seal around moving shafts. Used in some older generators, pumps, valves, etc.

These are some of the common keywords used for sealing parts and components in electrical and electric equipment.