Parker JM Clipper® Seals - Common Materials

Clipper oil seals are available in a wide range of materials. The following general materials descriptions are for the OD material “H” and corresponding lip material “L”.

OD & Lip Materials

Material Code Material Durometer Description Abrasion Resistance Min. Temperature Cont. Temperature Peak Temperature


Nitrile (NBR) 75 The NBR lip material has very good resistance to oil and gasoline. Superior resistance to petroleum-based hydraulic fluids. Good resistance to hydrocarbon solvents. Very good resistance to alkalis and solvents. Poor resistance to oxygenated solvents. Very Good -20 °F (-29 °C) 212 °F (100 °C) 250 °F (121 °C)


Nitrile (NBR) 90 The L7 lip material has a lower minimum temperature capability than the L5 material. Very Good -30 °F (-34 °C) 212 °F (100 °C) 250 °F (121 °C)


Carboxylated Nitrile (XNBR) 83 The XNBR lip material is generally tougher and more resistant to tear and abrasion than standard NBR. Outstanding -30 °F (-34 °C) 212 °F (100 °C) 250 °F (121 °C)


Hydrogenated Nitrile (HNBR) 75 The HNBR lip material offers improved abrasion resistance, chemical resistance, higher operating temperature and better ozone resistance than standard NBR. Outstanding -40 °F (-40°C) 250 °F (121 °C) 300 °F (149 °C)


Nitrile (NBR) 75 Homogenous NBR material without aramid fiber OD provides a very pliable seal that can be stretched over flanges or other obstructions on the shaft. A cover plate is recommended to keep the seal retained in the housing bore. Very Good -20 °F (-29 °C) 212 °F (100 °C) 250 °F (121 °C)


Arctic Nitrile (Low Temp NBR) 85 Low-temperature Nitrile lip material allows for lower minimum temperatures while providing good chemical and abrasion resistance. Very Good -50 °F (-46°C) 200 °F (93°C) 212 °F (100°C)


Alaska Nitrile (Low Temp NBR) 75 Same characteristics as L50, but softer with lower minimum temperature range. Very Good -70 °F (-57°C) 200 °F (93°C) 212 °F (100°C)


Fluoroelastomer (FKM) 90 FKM lip material offers outstanding resistance to high heat. Excellent resistance to oil, gasoline, petroleum hydraulic fluids, and hydrocarbon solvents. Very good impermeability to gases and vapors. Very good resistance to flame, weather, oxygen, ozone, and sunlight. Very little resistance to oxygenated solvents. Poor tear resistance. Good -40 °F (-40°C) 325 °F (163°C) 400 °F (204°C)


Fluoroelastomer (FKM) 90 Improved steam resistance. Good -40 °F (-40°C) 325 °F (163°C) 400 °F (204°C)


NBR / PTFE - PTFE bonded to NBR lip — PTFE layer provides improved dry running capability, chemical resistance, and reduces torque consumption. Very Good -20 °F (-29 °C) 212 °F (100 °C) 250 °F (121 °C)


FKM / PTFE - PTFE bonded to FKM lip. Very Good -40 °F (-40°C) 325 °F (163°C) 400 °F (204°C)


Ethylene Propylene (EPDM) 75 Excellent heat, ozone and sunlight resistance. Very good low-temperature flexibility, good resistance to alkalis, acids (such as acetic) and oxygenated solvents (such as MEK). Provides improved resistance to water and steam in applications where NBR and FKM exhibit poor service life. Good replacement for FKM where solvents are a problem. Not recommended for petroleum oil. Very Good -60 °F (-51°C) 250 °F (121 °C) 300 °F (149 °C)

JM Clipper Case Materials

H1, H3 - Neoprene/Aramid Composite
The aramid fiber-reinforced composite shell will fit a wide range of bore tolerances and provides a rustproof gasket-type seal at the OD. The composite case also will fill slight imperfections in the bore housing, reducing machining cost. Usually combined with a Nitrile lip material.

H5 - Fluoroelastomer/Aramid Composite
Offers the same construction benefits as H1 & H3. Usually combined with a Fluoroelastomer lip material.

JM Clipper Spring Materials

Springs are available in a wide range of materials. Clipper Oil Seal designs are furnished with 302 stainless steel springs as standard. Other spring materials are available at an additional cost.

English Shaft Dia. - up to & Including Length "w" (inch) Metric Shaft Dia. - up to & including Length "w" (mm)
0.375 0.051 10 1.3
0.750 0.068 20 2.0
1.250 0.085 30 2.2
1.500 0.102 40 2.6
2.000 0.119 50 3.0
2.750 0.136 70 3.5
3.750 0.153 95 3.9
5.000 0.188 130 4.8
9.000 0.239 240 6.1
+ 18.000 0.375 480 10.0