MIL-R-6855 is a military specification for synthetic rubbers in a variety of shapes and used for a wide variety of applications by all departments and agencies of the US Department of Defense. More specifically, MIL-R-6855 covers low-temperature-resistant rubber sheets, strips, and molded and extruded shapes. MIL-R-6855 does not cover polyurethanes.

Rubber materials covered by MIL-R-6855 are categorized into five classes and a number of subtypes:
  • Class 1: Resistant to fuel and petroleum
  • Class 2: Resistant to petroleum oil, weather, and ozone
    • Type A: High ozone concentration
    • Type B: Low ozone concentration
  • Class 3: Not resistant to oil
  • Class 4: Resistant to petroleum oil, weather, and ozone; for use in contact with acrylic and polycarbonate plastics
    • Type A: High ozone concentration
    • Type B: Low ozone concentration.
  • Class 5: Not resistant to oil; for use in contact with acrylic and polycarbonate plastics.
MIL-R-6855 lists dimensional tolerances for sheets, strips, tubing, and rods. The spec includes references to the appropriate tests for determining the material’s physical and mechanical property requirements, including ozone resistance, crazing, low temperature resistance, cold bend, color, and shelf life. Instructions are also included for appropriate identification markings for different material shapes and forms.

MIL-R-6855 is an incredibly thorough specification for synthetic rubbers that may be deployed in a wide range of applications and service environments. The tremendous detail included in the spec makes MIL-R-6855 a highly valuable tool for ensuring performance and reliability in the field.
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