Yuanyu Rubber Enterprise Co. Ltd. - Professional manufacturer of rubber products

NR (Natural Rubber)

A general purpose rubber with the optimum balance of physical properties essential for high performance engineering applications.
The working temperature range is considered to be -50°C/ -70°C to +120°C.
Long fatigue life, first choice for spring applications.
Has high strength without the need for reinforcing fillers.
Can be compounded to give a wide range of hardness.
Good low temperature flexibility.
Poor resistance to oils and solvents.
Requires protection against oxidisation, ozone and heat.

NBR (Nitrile-butadiene Rubber)

NBR is the most widely used elastomer in the seal industry today.
Good resistance to low temperature.
NBR is often necessary to sacrifice some high temperature resistance.
The working temperature range is considered to be -35°C to +120°C (-30°F to +250°F).
Good tear, and abrasion resistance.
NBR resists oil-based hydraulic fluids, fats, animal and vegetable oils, flame retardant liquids, grease, water, and air.
Special low-temperature compounds are available for mineral oil-based fluids.
Poor resistance to ozone, sunlight, or weather. They should not be stored near electric motors or other ozone generating equipment.
By CR, Hypalon, or PVC blending, the NBR can meet a more specified range of physical or chemical requirements.

NBR+PVC

PVC resins are blended with NBR to provide increased resistance to ozone and abrasion.
The PVC also provides a significant improvement in solvent resistance, yet maintains similar chemical and physical properties of NBR.

HNBR (Hydrogenated Nitrile Butadiene Rubber)

HNBR has excellent resistance to common automotive fluids (e.g., engine oil, coolant, fuel, etc.) and many industrial chemicals.
The working temperature range is considered to be -40°C to +165°C.
Good resistance to long-term exposure to heat, oil, and chemicals. Also good with aging resistance and low temperature resistance.
The automotive market is the largest consumer, using HNBR for a host of dynamic and static seals, hoses, and belts.
Disadvantage: expensive.

CR (Chloroprene Rubber, Neoprene)

CR was the earliest synthetic rubbers used to produce seals.
CR has good aging characteristics in ozone and weather environments, along with abrasion and flex cracking resistance.
CR is not effective in aromatic and oxygenated solvent environments.
The working temperature range is considered to be -40°C to +110°C.(-40°F to +230°F) But for short working periods it will take even 120°C.
Good gasoline resistance.

EPM, EPDM (Ethylene Propylene Rubber)

EPM/EPDM has a temperature range of -50°C to +120°/150°C (-60°F to +250°/300°F), depending on the curing system.
It has a great acceptance in the sealing world because of its excellent resistance to heat, water and steam, alkali, mild acidic and oxygenated solvents, ozone, and sunlight.
EPM/EPDM compounds are not recommended for gasoline, petroleum oil and grease, and hydrocarbon environments.
Good resistance to brake fluid.

IR (Isoprene Rubber)

IIR (Butyl)

Butyl has excellent resistance to phosphate ester fluids.
It has an inferior high temperature limit when compared to EPM.
The temperature service range for this material is -55°C to +105°C (-65°F to +225°F).
Good ozone, weather environments, abrasion, chemical, and cracking resistance.
Excellent air Impermeability.
Poor gasoline and hydrocarbon resistance.

SBR (Styrene-butadiene Rubber)

SBR must be compounded with reinforcing fillers for high strength and then has physical and chemical properties similar to NR.
It is not suitable for springs but has used widely for vehicle tyres where it is generally oil extended.
Excellent abrasion resistance.
The working temperature range is considered to be -50°C to +110°C (-65°F to +225°F).

BR (Butadiene Rubber)

Good temperature flexibility and high abrasion resistance under severe weather conditions.
Main use in in manufacture of tyres.
The working temperature range is considered to be -73°C to +120°C.
Used in blends with SBR and NR.
Poor processing properties and poor tear properties.

VQM (Silicone)

Moderate physical properties but are retained at high or low temperatures.
Good electrical properties and good ozone resistance.
The working temperature range is considered to be -50°C (-58°F) to +232°C (+450°F).
PMQ, PVMQ have even lower low-temperature resistance (-73°C~-90°C).
low tear strength and poor abrasion resistance.
Poor oil , and poor chemical resistance.

FVMQ (Fluoro-silicone)

Fluorosilicone combines the good high- and low-temperature properties of silicone with limited fuel and oil resistance.
FVMQ provide a much wider operational temperature range than Fluorocarbon rubbers.
The working temperature range is considered to be -73°C (-100°F) to 200°C (390°F).
FVMQ O-rings may also be exposed to petroleum based oils and/or hydrocarbon fuels.
Due to relatively low tear strength, high friction and limited abrasion resistance of these materials, they are generally recommended for static applications only.
FVMQ with high tear strength are also available. Some of these compounds exhibit improved resistance to compression set.
Disadvantage: too expensive.

FKM (FPM, Viton, Fluorel)

FKM O-rings should be considered for use in aircraft, automobile and other mechanical devices requiring maximum resistance to elevated temperatures and to many fluids.
FKM used in applications to resist harsh chemical and ozone attack.
The working temperature range is considered to be -26°C to +205°/230°C (-15°F to +400°/440°F). But for short working periods it will take even higher temperatures.
FKM resist mineral oils and greases, aliphatic, aromatic and also special chlorinated hydrocarbons, petrol, diesel fuels, silicone oils and greases.
Disadvantage: too expensive. Especially perfluoroelastomer(FFKM).

ACM, ANM (Alkyl Acrylate Coplolymer)

Good resistance at normal and elevated temperatures to oil and oxygen.
Excellent ozone and and weathering resistance.
The working temperature range is considered to be -0°C to +150°C. But for short working periods it will take even to 180°C.
Poor water, moist heat, and low-temperature resistance.

ECO, CO (Epichlorohydrin)

ECO compounds are noted for their superior gas impermeability and physical properties over a wide temperature range while maintaining excellent resistance to petroleum oils.
It has a stable cycling capability from low to high temperature.
Service temperatures are -51°C to150°C (-60°F to +300°F).
Resistance to ozone, oxidation, weathering, and sunlight.
Disadvantage: expensive.

CSM (Hypalon)