Sealing Lip Materials-English

FYC are good at elastomer that is commercially available. This allows us to optimum material for each customer’s application. The rubber materials are as below.

Rubber Materials

Nitrile （NBR）
Hydrogenated Nitrile （HNBR）
Polyurethane （PU）
Silicone （SIL）
Polyacrylate （ACM）
Fluoro Carbon（Viton）（FPM）
Fluorinated Silicone （FLS）
Ethylene Propylene （EPDM）
Polychloroprene （CR）
PTFE （PTFE）

Rubber Materials Properities

	CR	NBR	ACM	SIL	FPM	EPDM
Temperature Range	-45℃～100℃	-30℃～110℃	-20℃～150℃	-50℃～200℃	-20℃～200℃	-45℃～150℃
Tensile Strength	●	●	▼	▼	●	△
Elongation	●	●	▼	◎	▼	●
Rebound Resistance	◎	●	△	△	△	●
Tear Resistance	●	●	▼	▼	△	△
Abrasion Resistance	●	◎	△	▼	△	●
Impact Strength Resistance	◎	●	▼	▼	△	●
Gas Impermeability Resistance	◎	●	△	▼	●	△
Oxygen Resistance	●	△	●	◎	◎	●
Ozone Resistance	●	▼	●	◎	◎	◎
Weathering Resistance	●	△	●	◎	◎	◎
Flame Resistance	●	▼	●	◎	◎	◎
Heat Resistance	●	△	●	◎	◎	◎
Low Temperature Resistance	△	△	▼	◎	●	●
Oil & Fuel Resistance	■	●	●	△	◎	▼
Animal & Vegetable Oil Resistance	●	◎	◎	■	◎	●
Alcohol Resistance	◎	●	●	●	●	■
Alkaline Resistance	◎	●	▼	▼	■	●
Acid Resistance	●	●	△	△	●	●
Aliphatic-Solvent Resistance -Aliphatic -Aromatic	● △	◎ ■	◎ △	▼ ▼	◎ ◎	▼ ▼
Oxygenated-Solvent Resistance	▼	▼	▼	△	▼	◎
Water Oxygenated	●	●	▼	●	●	◎

◎－Excellent ●－Good ■－Suitable △－Limited ▼－Poor

Rubber Materials Comparison

	ADVANTAGES	LIMITATIONS
Nitrile（NBR）	Most commonly used material. Low cost. Good resistance to petroleum oils, water, silicone oils, greases, glycol base fluids. Good abrasion resistance, cold flow, tear resistance.	Poor resistance to ozone and weather aging. Poor resistance against aromatic and chlorinated hydrocarbon.
Polyacrylate（ACM）	Good resistance to mineral oils, gear oils, greases, aging and flex cracking, ozone. Anti-aging and tearing. Used to high surface speed environment. Higher temperature limit than NBR.	Fair cold temperature limit. Lower mechanical strength. Poor dry running ability, water resistance. Cost is higher than NBR.
Silicone（SIL）	Broad temperature resistance. Excellent weather and ozone resistance. Resistant to compression set.	Low resistance to hydrocarbon fluids like gasoline or paraffin fluids or steam above 50 psi. Cost is higher than NBR.
Fluoro Carbon（FPM）	Compatible with wide range of fluids. Excellent resistance to aromatic and chlorinated hydrocarbon. Commonly chosen as high temperature replacement of NBR or ACM.	Low temperature resistance is fair. Cost is high.

Recommended Material Speed Limitations

The above curves provide our recommended maximum shaft speeds for each of the common lip seal materials.