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FAIRCHILD OIL SEAL MATERIALS & SPECIFICATIONS
Oil Seals provide the best seal for dynamic, high temperature and caustic environments, and have become the most durable, dependable and robust solution to many applications in the automotive and manufacturing industries.
Oil Seals are made from various elastomers, and the most commonly used are Nitrile (NBR), Polyacrylate (ACM), and Fluorocarbon (FKM)*. There are a variety of other compounds available depending on your application requirements, so call us if you do not see the compound here.
One of the most important components of an Oil Seal is the elastomer material being used. When determining what elastomer is best suited for the environmental conditions in which the seal will be placed, the following properties are important to consider:
- Good chemical resistance
- Good elasticity
- High resistance to water
- Good resistance to heat and low temperature
- Good resistance to ozone (UV) and weather aging
- Low compression set
Fairchild Industries will provide the proper compound and profile to satisfy the sealing conditions your oil seals are in contact with. We can meet your requirements based on prints & specifications or samples, and work closely with engineering and purchasing to assure your specifications are met.
Please refer to the tables when making your application decision. These tables are based on historical and test data and industry standards, and are of great help for any general applications related question you may have.
* Flourocarbon is also known by its trade name “Viton”.
ASTM TEST TABLE:
|
BASE POLYMER |
NITRILE |
POLYACRYLATE |
SILICONE |
FLUORO-ELASTOMER |
|
Material Code |
N |
P |
S |
V |
|
Temperature Range * |
-40 F ~ 250 F
(-35 C ~ 120 C) |
-20 F ~ 300 F
(-30 C ~ 150 C) |
-80 F ~ 400 F
(-60 C ~ 200 C) |
-30 F ~ 400 F
(-35 C ~ 200 C) |
|
Oil Resistance |
E |
E |
G |
E |
|
Acid Resistance |
G |
F |
F |
E |
|
Alkali Resisitance |
G |
X |
X |
F |
|
Water Resisitance |
G |
F |
G |
G |
|
Heat Resistance |
G |
E |
E |
E |
|
Cold Resistance |
G |
F |
E |
F |
|
Wear Resistance |
E |
E |
G |
E |
|
Ozone Resistance |
G |
E |
E |
E |
|
ASTM D2000 Spec. |
2BG715B14B34E014
EO34EF11EF21 |
SDH710A26B16
B36EO16EO36 |
2GE8O7A19B37
EO16EO36G11 |
2HK710A110B38 |
Partial Fluid Compatibility Table:
| |
LIP MATERIAL |
|
|
TYPE OF FLUID TO BE SEALED |
NITRILE |
POLYACRYLATE |
SILICONE |
FLUORO-ELASTOMER |
|
Engine Oil |
E |
E |
G |
E |
|
Gear Oil |
G |
G |
X |
E |
|
Turbine Oil No.2 |
G |
G |
G |
E |
|
Machine Oil No.2 |
G |
G |
F |
E |
|
Automatic Transmission Fluid |
E |
E |
F |
E |
|
Petroleum Base Lubricating Oil |
E |
E |
F |
E |
|
Gasoline |
F |
X |
X |
E |
|
Light Oil / Kerosene |
F |
X |
X |
G |
|
Cutting Oil |
E |
G |
F |
E |
|
Grease |
E |
E |
E |
E |
|
E.P. Lubricants |
G |
E |
X |
E |
|
Water - Glycol |
E |
X |
G |
G |
|
Alcohol |
E |
X |
G |
F |
|
20 % Hydrochloric Acid Solution |
F |
F |
F |
E |
|
30% Sulfuric Acid Solution |
F |
F |
X |
E |
TABLE NOTES:
E = Excellent
G = Good for most applications.
F = Fair, can be used if no other materials available.
X = Not recommended.
- Phosphate Ester and Water Glycol hydraulic fluids are not included in the table.
Water resistance includes steam. No material is ideally compatible as lubricity of water is very poor.
PTFE, Ethylane Acrylate, and other elastomers are available.
GENERAL ADVANTAGES & COMPOUND INFORMATION:
|
Material |
Hardness
(Shore A) |
Temperature
Range |
Comments |
|
Nitrile
(Buna N)
(NBR) |
40 to 90
|
- 40 °F to 250 °F
|
Excellent general purpose material. A low cost compound, with good physical strength and good compression set. Good resistance to oil, fuel, water, and air. |
|
Chloroprene
(Neoprene)
(CR) |
30 to 90
|
- 40 °F to 250 °F
|
Good general purpose, low cost compound, with good resistance to flex cracking, ozone impermeability, abrasion, and compression set Good in oil, fuel, refrigerants and fair in water. Poor in aromatics. |
|
Butyl
(IIR) |
50 to 80
|
- 75 °F to 225 °F
|
Excellent impermeability for vacuum service, non flammable phosphate ester fluid resistance, and good weathering, water swell, ozone, and chemical resistance, except with petroleum base derivitaves. Poor compression set. |
|
Natural Rubber
(Poly-isoprene)
(NR) |
40 to 90
|
- 75 °F to 180 °F
|
Excellent resilience, cold temperature, and good abrasion resistance, compression set, tensile and low water swell. Good for steam if no oil present. Poor in heat, oil, fuel, ozone, and solvent resistance. |
|
Styrene- Butadiene
(Buna S)
(GR-S) (SBR) |
40 to 90
|
- 70 °F to 225 °F
|
Similar to natural rubber. (See above for details) |
|
Hydrin
(CO)
(ECO) |
60 to 90
|
- 65 °F to 300 °F
|
Excellent impermeability, oil and fuel resistance, and low temperature flexibility. Good solvent, and refrigerant resistance, compression set, and ozone resistance. Poor abrasion resistance. |
|
Hypalon
Chlorinated
Polyethylene
(CSM) |
50 to 85
|
- 65 °F to 250 °F
|
Excellent ozone, weather, chemical (except for fuels and solvents), and good abrasion resistance, impermeability for vacuum service, but poor compression set. |
|
Fluoro-Carbon Elastomers
(Viton) (Kel-F)
(Fluorel) (FPM)
(CPM) |
60 to 90
|
- 20 °F to 400 °F
|
Standard high cost material for excellent high temperature and chemical resistance. Poor only in caustics and ketones. Good mechanical properties and good in Di ester and Silicate ester fluids. |
|
Silicones
(Si) (PSi)
(VSi) (PVSi) |
30 to 80
|
- 80 °F to 450 °F
|
Standard high cost compounds, excellent water and dry heat resistance. Poor tensile, and abrasion, and poor oil, fuel and solvent resistance. |
|
Fluoro-Silicones
(LS 53)
(FSi) |
40 to 70
|
- 80 °F to 350 °F
|
Same as Silicones except good oil, fuel, and solvent resistance. |
|
Ethylene Propylene
(EP)
(EPM)
(EPT)
(EPDM) |
40 to 80
|
- 65 °F to 300 °F
|
Excellent resistance to steam, aging, abrasion, and phosphate ester fluids. Good compression set, ozone, ketone and weather resistance. Poor petroleum base resistance. |
|
Polyurethane
Cast
Millable
Injection
(AU)
(EU) |
60 SHORE A
TO
80 SHORE D
|
- 40 °F to 200 °F
|
Excellent elasticity, abrasion and flex cracking resistance. Good compression set, elongation and solvent resistance (except ketones). Extremely high tensile strength, but poor temperature range and hot water resistance, and poor with acids, and alkali. |
|
Polyacrylates
(ACM)
(ANM) |
40 to 90
|
- 20 °F to 300 °F
|
Excellent aging and high temperature resistance. Good with oils and solvents and phosphate ester fluids. Poor abrasion and water resistance. |
|
Thiokol
Polysulfide |
40 to 80
|
- 65 °F to 225 °F
|
Excellent solvent and petroleum based fuel and oil resistance. Good resilience, weather, ozone resistance, vacuum service and poor tensile, abrasion and compression set properties. |
|
Teflon |
Not an Elastomer
|
- 300 °F to 500 °F
|
Excellent lubricity, chemical and temperature resistance. Because of cold flow and high mechanical strength, Teflon does not seal well unless very carefully designed. Can be used as static seal readily, but as dynamic seal needs mechanical loading. |
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