What are the materials of skeleton oil seals? How to choose?

1、 What are the common materials for skeleton oil seals?

NBR nitrile rubber

Commonly used and cost-effective

Good resistance to mineral oil, gasoline, and hydraulic oil

Temperature: -40 ℃~120 ℃

FKM Fluororubber/Fluororubber

Strong resistance to high temperature (based on actual reports), oil, and chemical corrosion

Suitable for high temperature, heavy oil pollution, and construction machinery

Temperature: -20 ℃~220 ℃

ACM acrylic rubber

Heat resistant, oil resistant, and good aging resistance

Mostly used for automotive engines and transmissions

Temperature: -25 ℃~180 ℃

Silicone Silicone

High temperature resistance (based on actual reports), good low temperature resistance

Generally oil resistant, mostly used for non oil seals

Temperature: -60 ℃~230 ℃

EPDM (Ethylene Propylene Diene Monomer) rubber

Good water resistance, steam resistance, and aging resistance

Not resistant to mineral oil, mostly used for water seals and air conditioning systems

Temperature: -50 ℃~150 ℃

PU polyurethane

Wear resistant (based on actual reports), pressure resistant, tear resistant

Mostly used for hydraulic and heavy-duty working conditions

Temperature: -30 ℃~100 ℃

PTFE polytetrafluoroethylene (PTFE)

Self lubrication, corrosion resistance (based on actual reports), high temperature resistance (based on actual reports)

Do more combination oil seals and high-speed rotating working conditions

Temperature: -200 ℃~260 ℃

2、 How to choose materials? (One sentence judgment method)

Ordinary hydraulic, gear oil, room temperature

→ Choose NBR nitrile (most universal)

Engine, gearbox, high temperature environment

→ Select ACM acrylic ester or FKM fluororubber

High temperature+strong corrosion+heavy load

→ Directly apply FKM fluorine glue

Water, hot water, steam, not in contact with engine oil

→ Select EPDM (Ethylene Propylene Diene Monomer)

Low temperature, severe cold or high temperature ovens

→ Select silicone

High speed, wear-resistant (based on actual reports), high-pressure rotating shaft

→ Select PTFE PTFE oil seal

3、 Simple selection formula

Normal temperature oil → Nitrile NBR

Automotive engine → ACM/FKM fluorine rubber

Water medium → EPDM

Extreme high temperature corrosion → FKM fluorine adhesive

High speed wear-resistant (based on actual reports) → PTFE tetrafluoroethylene