Thermoseal ML-N562 is a synthetic fiber and nitrile butadiene gasket material designed for difficult sealing applications with very low flange pressures or very rough surface finishes. It combines Multi-Layer Technology structure for exceptional low flange pressure sealability and exceptional torque retention together with a more compressible core. Multi-Layer Technology sheet products consist of a reinforced high density core with conformable sealing layers on each side. ML-N562 provides heat and chemical resistance in coolant, lubricant, and hot air applications. Typical applications include automotive, marine, and small engine applications with intermittent operating temperatures up to 500° F (260° C).

Ref. Thickness of Measured Values




maximum 500° F (260° C)


maximum 1400 psi (9.6 MPa)

Density ASTM F1315

87 lbs/ft3 (1.4 g/cm³)

Compressibility ASTM F36J

minimum 20%

Recovery ASTM F36J

minimum 50%

Weight Increase ASTM F146

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


maximum 10%

Thickness Increase ASTM F146

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

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


< 10%

< 15%

Creep ASTM F38B (1/32")

maximum 20%

Sealability ASTM F37

<0.20 ml/hr

ASTM F104 Line Call Out


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