TM 1-1500-204-23-6
Table 3-3. Identification of Rubber Materials
Grade and
Specification
Type or class
Forms available
intended use
MIL-R-6130
Classes-Soft,
Molded, Sheet and
Crash protection pads,
(Chemically
Medium, Firm
Shapes
radio or Instrument
Blown)
mounts, or any other
place where protection
from shock or vibration
is required. Do not use
where sponge is in
continuous contact
with skin or where
application involves
tensile loading.
Grade A-Oil-resistant
at -40°F (-40°C).
Grade B-Non-oil-
resistant.
Grade C-Low
temperature to -54°F
(-48°C), non-oil resistant.
MIL-R-6855
Class I
Sheet, Strip, Tubing,
General aeronautical
Class II
Extruded Shapes,
use where rubber-
Class III
Molded Shapes, as
like synthetic
Class IV
ordered
material is required.
Class V
Class I-Fuel
resistant;
Class Il - Oil resistant;
Class Ill-Non-oil-resistant;
Class IV-Oil resistant (for use in
contact with acrylic plastics).
Class V-Non-oil-
resistant (for use
in contact with
acrylic plastics).
Grades 40, 60, 80-
Designate normal
durometer hardness
values.
3-8
