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Q: Oil Seal Cross Reference

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Q: Rubber Material Properties



PU (Polyurethane)

The polyurethane (PU) family has excellent mechanical features, such as wear resistance and tensile strength, and has a high elasticity compared to other rubbers.

Chemical   resistanceAliphatic   hydrocarbons (propane, butane)
  Mineral oils and greases
  Silicone oils and greases
  Water (up to +50°C max)
Compatibility   issueKetones,   esters, ethers, alcohols, glycols
  Hot water and steam
  Alkalis, amines, acids
Temperature   range-30°C /   +90°C
  -30°C / +110°C with special PUs

NBR (Nitrile Butadiene Rubber)

Nitrile rubber (NBR) is the general term for acrylonitrile-butadiene copolymer. The ACN content can vary between 18% and 50%. While the acrylonitrile content is important, the resistance to oil and fuel is more so. Conversely, the elasticity and compression set are not as good. The NBR has good mechanical properties and good wear resistance. However, its resistance to atmospheric agents and the ozone is relatively low.

Chemical resistanceAliphatic hydrocarbons (propane, butane, petroleum,   diesel fuel)
  Mineral oils and greases
  Fire-resistant fluids (HFA, HFB and HFC)
  Diluted acids, alkaline and saline solutions for low temperatures
  Water (up to +100°C max)
Compatibility issueFuels with a high aromatic content
  Aromatic hydrocarbons (benzene)
  Chlorinated hydrocarbons (trichlorethylene)
  Polar solvents (ketone, acetone, acetic acid, ethylene-ester)
  Strong acids
  Glycol-based brake fluids
  Atmospheric and ozone agents
Temperature range-30°C / +100°C (short-term peak at +120°C)
  -40°C / +100°C with special NBRs

FKM (fluorinated rubber)

Depending on their structure and fluorine content, fluoroelastomers can vary in terms of chemical resistance and resistance to cold. This FKM-based rubber is very often used for high-temperature hydraulic and pneumatic systems, industrial valves, injection/fuel systems, motor seals and high-vacuum systems.

Chemical resistanceMineral oils and greases, ASTM n°1, IRM 902 and IRM 903   oils.
  Fire-resistant liquids (HFD)
  Silicone oils and greases
  Mineral and vegetable oils and greases
  Aliphatic hydrocarbons (propane, butane, petroleum)
  Aromatic hydrocarbons (benzene, toluene)
  Chlorinated hydrocarbons (trichlorethylene)
  Petrol (including high alcohol content)
  Atmospheric and ozone agents
Compatibility issueGlycol-based brake fluids
  Ammoniac gas
  Organic acids with a low molecular weight (formic and acetic acids)
Temperature range-20°C / +200°C (short-term peak at +230°C)
  -40°C / +200°C with special FKMs

EPDM (Ethylene Propylene Diene Monomer rubber)

As an Ethylene Propylene Diene Monomer copolymer, EPDM is commonly used for hot water taps, cooling systems, brake systems, dishwashers and washing machines.

Chemical resistanceHot water and steam up to +150°C
  Glycol-based brake fluids (Dot 3 & 4) and silicone-based brake fluids   (Dot 5)
  Organic and inorganic acids
  Cleaning agents, sodium and potassium alkalis
  Hydraulic fluids (HFD-R)
  Silicone oils and greases
  Polar solvents (alcohols, ketones and esters)
  Atmospheric and ozone agents
Compatibility issueMineral oils and greases
  Low impermeability to gas
Temperature range-45°C / +150°C (short-term peak at +175°C)

HNBR (Hydrogenated Nitrile Butadiene Rubber)

This HNBR-based elastomer is obtained through selective hydrogenation of the NBR's butadiene groups. It is commonly used for power-assisted steering and for air conditioning.

Chemical resistanceAliphatic hydrocarbons
  Mineral and vegetable oils and greases
  Fire-resistant fluids (HFA, HFB and HFC)
  Diluted acids, saline solutions and bases for low temperatures
  Water and steam up to +150°C
  Atmospheric and ozone agents
Compatibility issueChlorinated hydrocarbons
  Polar solvents (ketones, esters and ethers)
  Strong acids
Temperature range-30°C / +150°C (short-term peak at +160°C)
  -40°C / +150°C with special HNBRs

VMQ (silicone rubber: methyl vinyl polysiloxane)

This FVMQ-based rubber is very often used for fuel systems.

Chemical resistanceAnimal and vegetable oils and greases
  Moderate water temperature
  Diluted saline solutions
  Atmospheric and ozone agents
Compatibility issueSuperheated steam up to +120°C
  Chlorinated hydrocarbons with a low molecular weight (trichlorethylene)
  Aromatic hydrocarbons (benzene, toluene)
Temperature range-60°C / +200°C (short-term peak at +230°C)

FVMQ (fluorosilicone rubber)

The FVMQ has mechanical and physical properties that are very similar to those of VMQ. However, the FVMQ offers better resistance to fuels and mineral oils. However, resistance to hot air is not as good as that of VMQ.

Chemical resistanceAromatic mineral oils (IRM 903 oil)
  Aromatic hydrocarbons with a low molecular weight (benzene, toluene)
Temperature range-70°C / +175°C

ACM (Polyacrylate)

Polymers containing ethyl acrylate (or butyl acrylate) have a small amount of monomer, which is necessary for cross-linking; ACM is a material with better heat resistance than NBR. It is often used for automatic gearboxes.

Chemical resistanceMineral oils (motor oils, gear box oils, ATF oils)
  Atmospheric and ozone agents
Compatibility issueGlycol-based brake fluids (Dot 3 & 4)
  Aromatic and chlorinated hydrocarbons
  Water and steam
  Acids, alkalis and amines
Temperature range-25°C to + 150°C (short-term peak at +160°C)
  -35°C / +150°C with special ACMs

AEM (ethylene acrylate rubber)

As a methyl acrylate and ethylene copolymer, AEM is considered to be better resistant to heat than ACM. Its characteristics make it an intermediary between ACM and FKM.

Chemical resistanceCoolants
  Aggressive mineral oils
  Atmospheric agents
Compatibility issueAromatic solvents
  Strong acids
  Brake fluids
  Gearbox oils
  ATF oils
Temperature range - 40°C à + 150°C

CR (Polychloroprene)

This CR-based elastomer is used in the refrigeration industry and for ventilation systems. This chloroprene was the first synthetic rubber to be developed and marketed.

Chemical resistanceParaffinic mineral oils
  Silicone oils and greases
  Water and water-based solvents for use at low temperatures
  Refrigerant fluids
  Carbon dioxide
  Atmospheric and ozone agents
Limited chemical resistanceNaphthenic mineral oils
  Aliphatic hydrocarbons (propane, butane, petroleum)
  Glycol-based brake fluids
Compatibility issueAromatic hydrocarbons (benzene)
  Chlorinated hydrocarbons (trichlorethylene)
  Polar solvents (ketone, acetone, acetic acid and ethylene-ester)
Temperature range-40°C / +100°C (short-term peak at +120°C)

FFKM (perfluorinated rubber)

FFKM has the best resistance to high temperatures and an excellent chemical inertia. This FKM-based rubber is very often used for high-temperature hydraulic and pneumatic systems, industrial valves, injection/fuel systems, motor seals and high-vacuum systems.

Chemical resistanceAliphatic and aromatic hydrocarbons
  Polar solvents (ketones, esters, ethers)
  Organic and inorganic acids
  Water and steam
  High-vacuum systems
Problème de compatibilitéCoolants (R11, R12, R13, R113, R114, etc.)
Temperature range-15°C / +320°C

The table below gives an overview of the physical, chemical and mechanical characteristics for each of the materials.

Resistance to abrasion2322424224
Acid resistant4322113133
Resistance to chemicals4221111222
Resistance to cold4222342222
Dynamic properties3332324124
Electrical properties3332141331
Resistance to fire4424112443
Resistance to heat1122111121
Sealing water1122224224
Resistance to oil1324112112
Resistance to ozone1121111241
Resistance to tearing2331434224
Tensile strength3221213124
Resistance to water / steam4431233123
Resistance to atmospheric agents1111111231

1. excellent properties    2. Good properties    3. Average properties    4. Poor properties

Q: Several factors affect the sealing performance
  1. Temperature
    Low-temperature polyurethane or rubber seals will reduce flexibility, causing leakage and even entire seal becomes stiff brittle. A high temperature will seal volume expansion, soften, resulting in a rapid increase in seal friction and reduce pressure capacity during exercise. Polyurethane or rubber seal is recommended continuous operating temperature range of -10 ℃ ~ + 80 ℃.

  2. velocity
    Movement speed is very low (<0.03m / s), we should consider the stability of equipment operation and whether a "crawling" phenomenon. High velocity (> 0.8m / s), the lubricating oil film may be damaged, due to lack of a good seal lubrication and friction heat, resulting in greatly reduced life expectancy.
    Recommend polyurethane or rubber seals within 0.03m / s ~ 0.8m / s speed range of work is more appropriate.

  3. The working medium
    Except in strict accordance with the manufacturer's recommendations for selecting the working medium, the working medium is essential to keep clean. Oil aging or pollution not only causes the system components fails, the seal accelerate aging and wear, and which may scratch or embedded dirt seal, seal failure. Therefore, we must regularly check the oil quality and cleanliness, according to standardized equipment maintenance or replacement of the oil filter. In the remaining oil in the cylinder by high pressure compressed air so it will generate heat seal burn, even charring. To avoid this from happening, in the hydraulic system when the initial run, the exhaust gas treatment should be carried out. Hydraulic cylinders should run slowly for several minutes at low pressure, confirm that drained the oil remaining in the air, before it can function.

  4. Working Pressure
    Seal has the lowest starting pressure (minimum service pressure) requirements. Low-voltage operation are required to use low friction properties, start small resistance seal. In the following 2.5MPa, polyurethane seal is not suitable; to consider the case when the high pressure seal compression deformation, the required anti-extrusion ring, grooving also has special requirements.
    In addition, different materials have different optimal seal working pressure range. For optimal operating pressure range of polyurethane seal is 2.5 ~ 31.5MPa.
    Temperature, pressure on the sealing performance are interrelated, so do consider. Table:
    Imported polyurethane material PU
     Maximum operating pressure
    Maximum Temperature Range Temperature Range
    Velocity of -25 to +80 -25 to +110
    0.5m / s 28MPa 25MPa
    0.15m / s 40MPa 35MPa

  5. lateral load
    Piston support ring must be installed on ships to ensure that the fuel tank can withstand a greater load. Seal and support ring from a completely different role, the seal can not replace the support ring load. Side force hydraulic cylinder, must be added to the carrying capacity of strong support ring (available when overloaded metal ring) to prevent the seals under conditions eccentric work causes leaks and abnormal wear.

  6. The hydraulic shock
    Many factors have hydraulic shocks, such as sudden excavator bucket against a stone, crane or lifting heavy objects down instantly. Except outside factors for the high-pressure flow of the hydraulic system when the actuator (hydraulic cylinder or a hydraulic motor, etc.) to change, if the valve performance is not very good, it is easy to produce hydraulic shock. Instant high-pressure hydraulic shocks generated by the system may be several times the working pressure, this high pressure in a very short period of time it will seal the tear or partial squeeze into the gap, causing serious damage. Generally should be installed hydraulic impact cylinder cushion ring and retaining ring on the piston rod. Cushion ring mounted in the front oil seal absorbs most of the shock pressure, ring seal to prevent squeeze gap under high pressure, the roots bitten bad.

Q: O-ring international standards

Now standard at home and abroad O-rings are the following, to understand these standards and can help you better choice seals.

International Standard ISO 3601-1 German standard DIN 3771 Chinese standard GB 3452.1-92 sectional diameter of 1.80 / 2.65 / 3.55 / 5.30 / 7.00 above are MM

American Standard AS 568A British Standard BS1806 cross-sectional diameter of 1.78 / 2.62 / 3.53 / 5.33 / 6.99

British Standard BS 4518 Swedish standard SMS 1586 cross-sectional diameter of 1.6 / 2.4 / 3.0 / 57 / 8.4

French standard R sectional diameter of 1.90 / 2.70 / 3.60 / 5.33 / 6.99

Japanese standard JIS B2401 P cross-sectional diameter of 1.9 / 2.4 / 3.5 / 5.7 / 8.4 G cross-sectional diameter of 3.1 / 5.7

Priority Metric size sectional diameter 1.0 / 1.5 / 2.0 / 2.5 / 3.0 / 3.5 / 4.0 / 4.5 / 5.0 / 5.5 / 6.0 / 7.0 / 8.0 / 10.0 / 12.0

American Standard AS 568A cross-sectional diameter of 1.02 / 1.42 / 1.63 / 1.83 / 1.98 / 2.08 / 2.20 / 2.46 / 2.95 / 3.00

Chinese standard GB 1235-76 (the outer diameter of this standard is the standard, apart from the above are the inner diameter) cut diameter 1.9 / 2.4 / 3.1 / 3.5 / 5.7 / 8.6

Q: What is the mode of transportation?

A: According to the transport time and price, we will advise the best way of transportation for you.

By Express: DHL, FedEx, UPS, TNT, EMS and other good express companies.

By Air: from Guangzhou to your nearest airport.

By Sea: from Guangzhou to your nearest seaport.

Q: How to order custom products?


1. Send your drawings or prototypes to us

2. Make the mould as per your drawings or prototypes

3. Send you the samples to test

4. Quantity production if the samples are confirmed

Q: Where are morgan seals company located?

Morgan seals research and development department is located at No. 2, Xinrui Road, Science City, Huangpu District, Guangzhou. Morgan seals old site( still in use) is located at Building 18, No. 828, Maogang Road, Huangpu District, Guangzhou, China.   Morgan seals  new site is located at No. 97, Tianyuan Road, Yonghe Economic Development Zone, Huangpu District, Guangzhou.Please visit our locations & directions page for our mailing address, phone number, map, and more.

Q: Can I come look at your seals factory?

Yes, please contact with us to set up an appointment to visit or audit us. While you are here, we will be happy to show you our research and development department, production facility and our Quality Control department.

Q: What are morgan seals' minimum order requirements?

Usually our minimum order amount is 5000USD. For the order below 5000USD, the deal can be made based on EXW works and we will need 100USD operating cost. For anything we have in stock, we do not need any minimun order quantity. If we have to manufacture the part, there is a $400 per item minimum.

Q: Can I get samples from Morgan Seals?

Yes, if we have your size in stock, we will send you the totally the same dimension sample to you. If we do not have your size in stock, we will send the similiar one if needed. Just simply provide your air courier account number, for example, DHL, UPS, Fedex, TNT, and we will arrange the sample sending ASAP.

If they are not in stock or the amount is large, sample cost and delivery freight need to be paid. We will deduct the sample fee after the bulk orders are placed.   Please send us the email for a free Sample Request form today.

Q: If I am having a design problem, what can Morgan Seals do for me?

Don't hesitate to call our knowledgeable sales or engineering department. If you need design assistance from our engineers, simply email us your detail of requirement.