 The most important component of an oil seal is the clastomer material.
To consider the environmental conditions, the following properties
are important:
- Good chemical resistance
- Good resistance to heat and low temperature
- Good resistance to ozone and weather aging
- Good elasticity
- High resistance to water
- Low compression set
- Raw material cost
In order to satisfy various sealing conditions, AAI has many compounds available for your choice.
| BASE POLYMER |
NITRILE |
POLYACRYLATE |
SILICONE |
FLUOROELASTOMER |
| 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 |
* maximum temperature limits depend on other operating conditions.
| |
Advantage |
Disadvantage |
| FLUOROELASTOMER |
Good temperature resistance.
Commonly chosen as high temperature replacement for Nitrile or Polyacrylate. |
Fair resistance to water, dry running.
Low temperature resistance is fair. |
| POLYACRYLATE |
Polymerised acrylic acidesters or PA and ACM.
Good resistance to mineral oil, hypoid gear oil E.P. additive, greases, aging and flex cracking. |
Poor cold temperature limit, dry running ability, water resistance.
Lower mechanical strength. |
| NITRILE |
Commonly referred to as Buna-N or NBR and is copolymer of Butadiene and Acryonitrile.
Good resistance to petroleum oils, water, silicone oil, greases, glycol base fluids.
Good abrasion resistance, cold flow, tear resistance. |
Poor resistance to ozone and weather aging. |
| SILICONE |
Broad temperature range.
Good ozone resistance
Resistant to compression set. |
Low resistance to hydrocarbon fluids like gasoline or paraffin fluids or steam above to 50 psi. |
- TABLE 3 Fluid Compatibility
| |
LIP MATERIAL |
| TYPE OF FLUID TO BE SEALED |
NITRILE |
POLYACRYLATE |
SILICONE |
FLUOROELASTOMER |
| 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 |
- E Excellent
G Good for most applications.
F Fair, can be used if no other materials available.
X Not recommended.
- Phosphate Easter 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 elastomars are available.
|
