Compound - HanFeng Rubber Products
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image  Compound

ASTM D1418 Designation: NBR
ASTM D2000 Class: BF, BG, BK, CH
HF Compound Designation: NR
Standard Color: Black
Description: Presently the seal industry's most widely used and economical elastomer, Nitrile combines excellent resistance to petroleum-based oils and fuels, silicone greases, hydraulic fluids, water and alcohols, with a good balance of such desirable working properties as low compression set, high tensile strength, and high abrasion resistance.
Key Use(s): Oil resistant applications of all types. Low temperature military uses. Off-road equipment. Automotive, marine, aircraft fuel systems. Can be compounded for FDA applications.
Temperature Range
Standard Compound: -40° to +257°F
Special Compound: -76° to +275°F
Hardness (Shore A): 40 to 90.
Features: Comprised of the copolymer butadiene and acrylonitrile, in varying proportions. Compounds can be formulated for service temperature ranging from -85°F to +275°F. Use of Carboxylated Nitrile can have superior abrasion resistance, while still having improved oil resistance.
Limitations: Nitrile compounds are attached by small amounts of Ozone. Phthalate type plasticizers are commonly used in compounding Nitrile Rubber. These plasticizers can migrate out and cause problems with certain plastics. Also, new regulations on certain phthalates have limited their use.

 

ASTM D1418 Designation: IIR
ASTM D2000: AA,BA
HF Compound Designation: BU
Standard Color: Black
Description: An all-petroleum product, Butyl is a copolymer of isobutylene and isoprene and has largely been replaced by Ethylene Propylene since its introduction.
Key Use(s): Highly effective in vacuum sealing applications. Good seal for hydraulic systems.
Temperature Range: Standard Compound: -50° to +250°F.
Hardness (Shore A): 30 to 90
Features: With outstanding low permeability to gases, Butyl is especially effective in vacuum sealing applications. It also features good to excellent resistance to ozone and sunlight aging.
Butyl further features excellent shock dampening capabilities.
Only slightly affected by oxygenated solvents and other polar liquids, Butyl is often utilized in seals for hydraulic systems using synthetic fluids. It is good with MEK, and silicone fluids and greases.
Limitations: Because it is a petroleum product, Butyl has poor resistance to hydrocarbon solvents and oils, and diester-based lubricants.

 

ASTM D1418 Designation: EPDM
ASTM D2000 Class: AA, BA, CA, DA
HF Compound Designation: EP
Standard Color: Black
Description: A copolymer of ethylene and propylene (EPR), combined with a third comonomer adiene(EPDM), Ethylene Propylene has gained wide seal industry acceptance for its excellent ozone and chemical resistance characteristics.
Key Use(s): Outdoor weather resistant uses. Automotive brake systems. Automobile cooling systems. Water applications. Low torque drive belts.
Temperature Range
Standard Compound: -40° to +275°F
Special Compound: -76° to +302°F
Hardness (Shore A): 40 to 95
Features: When compounded using peroxide curing agents high temperature service can reach +350°F. Good resistance to acids and solvents (i.e. MEK and Acetone).
Limitations: Have no resistance to hydrocarbon fluids.
ASTM D1418 Designation: FKM
ASTM D2000 Class: HK
HF Compound Designation: VT
Standard Color: Black,GREEN
Description: Combining high temperature resistance with outstanding chemical resistance, Fluorocarbon-based compounds approach the ideal for a universal O-ring material.
Key Use(s): Seals for aircraft engines. Seals for automotive fuel handling systems. High temperature/low compression set applications. Wide chemical exposure situations. Hard vacuum service.
Temperature Range
Standard Compound: -13° to +446°F
Special Compound: -40° to +446°F
Hardness (Shore A): 55 to 90.
Features:High fluorine grades offer higher resistance to swell in high octane and oxygenated fuel blends. This give superior performance in Ethanol/Methanol blended gasoline. Base resistant grades offer improved resistance to amine based oil protectants found in new transmission oils. Also, improved resistant to steam for higher temperature services. Low temperature bases can improve performance to -40°F.
New Polymers being offered have improved chemical resistance and low temperature performance.
Viton® Extreme™ ETP offers similar chemical compatibility as Kalrez™ with temperature performance with a TR(10) of -40°F and brittleness to -76°.
Limitations: Fluorocarbons (Viton®s) are not recommended for exposure to ketones, amines, low molecular weight esters and ethers, nitro hydrocarbons, hot hydrofluoric or chlorosulfonic acids, or Skydrol® fluids. They are also not recommended for situations requiring good low temperature flexibility.

 

ASTM D1418 Designation: FVMQ
ASTM D2000 Class: FK
HF Compound Designation: FS
Standard Color: Blue
Description: Fluorosilicone combines the good high and low temperature stability of Silicones with the fuel, oil, and solvent resistance of Fluorocarbons.
Key Use(s): Aerospace fuel systems. Auto fuel emission control systems. Primarily for static sealing applications.
Temperature Range: Standard Compound: -75° to +400°F.
Hardness (Shore A): 40 to 80.
Features: Fluorosilicone is most often used in aerospace applications for systems requiring fuel and/or diester-based lubricant resistance up to 400° F.
Although generally specified for aerospace use, due to its excellent fuel resistance and high temperature stability, Fluorosilicone is becoming an increasingly popular material for a wider range of sealing applications.
Featuring good compression set and resilience properties, fluorosilicone compounds are suitable for exposure to air, sunlight, ozone, chlorinated and aromatic hydrocarbons.
Limitations: Due to limited physical strength, poor abrasion resistance, and high friction characteristics, Fluorosilicone elastomers are not generally recommended for dynamic sealing. They are predominately designed for static sealing use. They are also not recommended for exposure to brake fluids, hydrazine, or ketones.

ASTM D1418 Designation: MQ, PMQ, VMQ, PVMQ
ASTM D2000 Class: FC, FE, GE
HF Compound Designation: SL
Standard Color: Red,Translucent
Description: A group of elastomers, made from silicon, oxygen, and hydrogen, Silicones are renowned for their retention of flexibility and low compression set characteristics, within one of the widest working temperature ranges for elastomers.
Key Use(s): Static seals in extreme temperature situations. Seals for medical devices, compatible with FDA regulations.
Temperature Range:
Standard Compound: -85° to +400°F
Special Compound: -148° to +400°F
Hardness (Shore A): 30to 80
Features: Phenyl (PVMQ) based silicones can perform to -155°F. New polymers can take short term to 600°F.
Limitations: Generally, low abrasion and tear resistance, and high friction characteristics preclude silicones from effectively sealing some dynamic applications. Silicones are also highly permeable to gases and are generally not recommended for exposure to ketones (MEK,acetone) or concentrated acids.

 ASTM D1418 Designation: CR
ASTM D2000 Class: BC, BE
HF Compound Designation: CR
Standard Color: Black
Description: One of the earliest of the synthetic materials to be developed as an oil-resistant substitute for Natural Rubber, Neoprene is a homopolymer of chloroprene (chlorobutadiene).
Key Use(s): Numerous component uses in the transportation field. Recommended for exposure to weathering. Preferred sealing material for refrigeration industry. FDA approved for food & beverage industry use.
Temperature Range:
Standard Compound: -40° to +250°F (Dry Heat Only)
Special Compound: -67° to +250°F
Hardness (Shore A): 40 to 90.
Features: Neoprene can be used in innumerable sealing applications due to its broad base of such desirable working properties as: good resistance to petroleum oils; good resistance to ozone, sunlight and oxygen aging; relatively low compression set; good resilience; outstanding physical toughness; and reasonable production cost.
Due to its excellent resistance to Freon® and ammonia, Neoprene is also widely accepted as a preferred material for refrigeration seals.
Limitations: Neoprene is generally attacked by strong oxidizing acids, esters, ketones, chlorinated, aromatic and nitro hydrocarbons. Because Nitrile is economically competitive with Neoprene, and generally has superior performance characteristics in most situations, it has largely replaced Neoprene in the O-rings of today.
ASTM D1418 Designation: SBR
ASTM D2000 Class: AA, BA
HF Compound Designation: SB
Standard Color: Black
Description: Also known as Buna S, or GR-S (Government Rubber-Styrene), Styrene Butadiene was the elastomer substituted for Natural Rubber during World War II. Compounded properties are similar to those of Natural Rubber.

Key Use(s): Isolation Dampeners, conveyor belts.
Temperature Range: Standard Compound: -50° to +212°F. (Dry Heat Only)
Hardness (Shore A): 40 to 90.
Features: The main use for Styrene Butadiene today is in the manufacturing of automobile tires and conveyor belts.
Limitations: SBR is not recommended for exposure to petroleum oils, most hydrocarbons, strong acids, or ozone.
This material is seldom used in modern sealing applications. It has been replaced by better performing materials.
ASTM D1418 Designation: NR
ASTM D2000 Class: AA
HF Compound Designation: NR
Standard Color: Black
Description: Natural Rubber is the vulcanized product of the juice of the Hevea tree (latex).
Key Use(s): Mainly used for dampeners due to its ability to absorb vibration. Used for stoppers for cost and chemical compatibility. Most natural rubber still used for tires.
Temperature Range: Standard Compound: -58° to +158°F. (Dry Heat Only)
Hardness (Shore A): 40 to 90.
Features: Natural Rubber features high tensile strength; high resilience, high abrasion and high tear resistance properties, with a good friction surface and excellent adhesion to metals. Natural Rubber features good resistance to organic acids and alcohols, with moderate resistance to aldehydes.
Limitations: Not widely used in sealing industry due to poor compression set performance at elevated temperature and lack to resistance to petroleum based fluids. Medical industry has moved away from the use of Natural Rubber because of its allergic reactions after repeated contact.

ASTM D1418 Designation: PA,ACM
ASTM D2000 Class: DF,DH
HF Compound Designation: PA
Standard Color: Black
Description: Ethylene-acrylic(vamac)is a terpolymer of ethylene,methyl acrylate,and an acid-containing monomer as a cure site,it exhibits properties similar to those of polyacrylate,but with extended low temperature range and with enhanced mechanical properties.
Ethylene-acrylic offers a high degree of oil,ozone,uv and weather resistance.
Key Use(s): o-rings,rubber seals and custom molded rubber components for automotive sealing applications,automotive transmissions and power steering seals.
Temperature Range: Standard Compound: -40° to +300°F. (Dry Heat Only)
Hardness (Shore A): 40 to 90.
Features: Ethylene-acrylic features excellent vibration dampening,excellent heat aging characteristics,good dynamic property retention over a wide temperature range,resisitance to transmission fluids ,water,glycol,mixtures,and alkalies.
Limitations: not recommended for exposure to fuel,brake fluid,aromatic hydrocarbons or phosphate esters.