Thermoseal ML-5270 is a high performance synthetic fiber and polychloroprene binder gasket material that is resistant to refrigerants and oil mixtures. Its unique Multi-Layer Technology structure provides exceptional low flange pressure sealability with exceptional torque retention. Multi-Layer Technology sheet products consist of a reinforced high density core with conformable sealing layers on each side. Typical applications include gaskets in hermetic and semi-hermatic compressors and oil pan gaskets in heavy-duty diesel engines with intermittent operating temperatures up to 350° F (177° C).

Ref. Thickness of Measured Values



maximum 350° F (177° C)


maximum 800 psi (5.5 MPa)

Density ASTM F1315

106 lbs/ft3 (1.7 g/cm³)

Compressibility ASTM F36J

8 - 14%

Recovery ASTM F36J

minimum 40%

Weight Increase ASTM F146

After immersion in Fuel B for 5 hrs. at 73° (23° C)


maximum 15%

Thickness Increase ASTM F146

After immersion in ASTM Oil #1 for 5 hrs. at 300° F (149° C)

After immersion in Oil IRM903 for 5 hrs. at 300° F (149°)

After immersion in Fuel A for 5 hrs. at 73° F (23° C)


0 - 5%

maximum 30%

5 - 10%

Creep ASTM F38B (1/32")

maximum 30%

Sealability ASTM F37

<0.20 ml/hr

Tensile Strength ASTM F152

2250 psi (15.5 MPa)

ASTM F104 Line Call Out


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