Fluorocarbon rubber is a fluorocarbon-based elastomer containing fluorine in the molecule, and is divided into different categories depending on the fluorine content (i.e., monomer structure).
The product’s high temperature resistance is superior to silicone
rubber, with excellent chemical resistance. It is resistant to most oils and
solvents (except ketones and esters), weather and ozone. However, the product’s
cold resistance is not satisfactory, with the regular use temperature range of
-20 ~ 250 °C.
Suitable for use in vehicles, locomotives,
diesel engines, fuel systems and seals for chemical plants.
Advantages:
- Resistant to heat up to 250 °C
- Resistant to most oils and solvents, in
particular, all acids, aliphatic hydrocarbons, aromatic hydrocarbons, animal
and vegetable oils
Disadvantages:
- Not recommended for ketones, esters with low
molecular weight and mixtures containing nitrates.
FFKM has the best capability in heat resistant, acid and alkaline resistant, and organic solvents resistant among all elsatomer materials. It can resist the corrosion of more than 1600 chemical solvents such as ether, ketone, ester, nitrogen-containing compound, hydrocarbon etc. and withstand high temperature up to 320°C.
The material is also characterized by advanced homogeneity which prevents the leakage or surface cracking.
Perfluoro elastomer series products are widely
used in the aerospace industry, nuclear, semiconductor industry and information-related industries. Its
application includes etching processes and various high vacuum sealing
processes.
Advantages:
- Optimum heat resistance
- Excellent chemical resistance
Disadvantages:
- Poor low temperature resistance
- High raw material cost
- Challenging production process
Nitrile butadiene rubber or nitrile rubber is copolymerized by acrylonitrile and butadiene with acrylonitrile content ranging from 18% to 50%. Nbr is one of the most commonly used rubbers for oil seals and O-rings.
With the containing of acrylonitrile, the higher the acrylonitrile content, the
better the resistance to petrochemical hydrocarbon fuel. However, the performance
under low temperature will be poorer. The normal temperature range for product
use is from -25 °C to 100 °C.
Used
for fuel tanks, lubricant oil tanks, and to make rubber parts used in fluid
media such as petroleum hydraulic oil, gasoline, water, silicone grease,
silicone oil, diester lubricating oil, and glycol hydraulic oil. It is the most
widely used and cost-effective rubber seal in the market.
Advantages:
- Good resistance to oil, water, solvent and high-pressure
oil.
- Low permanent compression set value, good abrasion
resistance and elongation.
Disadvantages:
- Not suitable for use in polar solvents such as
ketones, nitrohydrocarbons, MEK and chloroform. It has poor weather resistance
and needs to be protected from damage of ozone and ultraviolet rays.
Hydrogenated nitrile rubber (Hydrogenate Nitrile) is a kind of nitrile rubber that has been hydrogenated to remove part of the double chain.
After hydrogenation, its
temperature resistance and weather resistance are much higher than that of
general nitrile rubber. Oil resistance of HNBR is similar to that of general
nitrile rubber. The temperature range for product use is -45 ~ 150 °C.
Generally, it is applicable to the detergent for
washing clothes or dishes. Widely used in air conditioning and refrigeration
industry, as seals in the environment-friendly refrigerant R134a systems. Also broadly used as automotive engine system seals.
Advantages:
· Better abrasion resistance than NBR
- Excellent corrosion resistance, tensile
resistance, tear resistance and compression set
- Good resistance to ozone, sunlight and other
atmospheric conditions
Disadvantages:
- Not recommended for use in alcohol, ester or
aromatic solutions.
Ethylene propylene rubber (ethylene propylene diene monomer) is copolymerized by ethylene and propylene, double chains with main chain not bonded. It has excellent resistance to polar solvents such as alcohols, ketones, ethylene glycol and phosphate ester hydraulic fluids.
EPDM has excellent heat resistance, aging resistance, ozone
resistance and stability, and its normal use temperature range is -50 ~ 150 °C.
The product can be used in alcohol and ketone fluids. It has high temperature and steam resistance, good
impermeability to gas. Suitable to use as seals in high temperature and
steam environment, bathroom equipment seals or parts, rubber parts in the brake system and seals in the radiator (car water tank)
Advantages:
- Good weather resistance and ozone resistance
Disadvantages:
- Poor oil resistance, not recommended for food-related
use or exposure to aromatic hydrogen
The main chain of silicone rubber is composed of silicon in the form of si-o-si. It has excellent heat resistance, cold resistance, ozone resistance and atmospheric aging resistance. It also has good electrical insulation performance.
Silicone rubber is suitable for seals or rubber parts used in the household appliance industry, such as rubber parts in electric kettles, electric irons, and microwave ovens It can also apply for seals or rubber parts in the electronics industry, such as mobile phone keys, shock absorption pads in DVDs, seals in cable joints, as well as seals used in various articles which have direct contact with the human body.
Advantages:
- Good elasticity and compressibility
- Good resistance to neutral solvents - Excellent heat resistance
- Excellent cold resistance
- Excellent resistance to ozone and oxide
corrosion
- Excellent electrical insulation
- Good heat insulation and heat dissipation
Disadvantages:
- The product has low tensile strength inferior to
that of ordinary rubber and has no oil resistance. Not recommended for use in
most concentrated solvents, oils, concentrated acids and diluted sodium
hydroxide.
PTFE is a kind of engineering material. The PTFE coating is a dry film that reduces the friction on the surface of the seal and therefore no fluid lubricants are needed.
The advantages of PTFE coating include easy identification, easy assembly, low friction, and non-sticky. PTFE coating also provides advantages for the assembly lines. We are here to supply qualified and reliable sealing coating to effectively reduce the friction coefficient.
Advantages:
- Excellent temperature resistant
- Good to use as insulator
- Excellent chemical resistant performance
Disadvantages:
- Poor load capacity
- Poor mechanical properties
Polyurethane rubber has very good mechanical properties. Its hardness, elasticity, and wear resistance are far superior to other rubber products.
Meanwhile, the product also has good aging resistance, ozone resistance,
and oil resistance. The normal use temperature range is -40 ~ 90 °C.
Application areas include cylinder seal, electrical system and other high voltage and high pressure working environment.
Advantages
- Wear resistance and high-pressure resistance
- Suitable for seals with high pressure and wear
resistance
- Suitable for seals used in high voltage and high-capacity
electrical systems
Disadvantages:
- Not resistant to high temperature
Polyacrylate rubber is an elastomer with alkyl ester acrylate as the main component. It has good petrochemical oil resistance, high temperature resistance and weather resistance.
However, it is not satisfactory
in terms of mechanical tensile, compression set and water resistance, inferior
to ordinary oil-resistant rubber. The normal use temperature range is -25 ~ 170
°C.
The ACM is applicable to automotive transmission oil, automotive transmission
system, automotive steering system and power system seals.
Advantages:
- Good oxidation resistance and weather resistance
- Has properties of anti-bending and anti-deformation
- Excellent resistance to oil
Disadvantages:
- Not suitable for hot water
- Not suitable for brake oil
- Low temperature resistance
- Not suitable for phosphate ester