Practice for Rubber—Standard Temperatures for
Testing
Practice for Rubber and Rubber Latices—
Nomenclature
Test Methods for Rubber Property—Brittleness
Point of Flexible Polymers and Coated Fabrics
Test Method for Rubber Property—Durometer
Hardness
Practice for Rubber—Preparation of Product Pieces
for Test Purposes from Products
Practice for Rubber IRM 901, IRM 902, and IRM
903 Replacement Oils forASTM No. 1, ASTM No. 2, and
ASTM No. 3 Oils
3. Purpose
3.1 The purpose of this classification system is to provide
guidance to the engineer in the selection of practical, commer-
cially available rubber materials, and further to provide a
method for specifying these materials by the use of a simple
“line call-out” designation.
3.2 This classification system was developed to permit the
addition of descriptive values for future rubber materials
without complete reorganization of the classification system
and to facilitate the incorporation of future new test methods to
keep pace with changing industry requirements.
4. Type and Class
4.1 The prefix letter “M” shall be used to indicate that the
classification system is based on SI units.
N
OTE
3—Call outs not prefixed by the letter M refer to an earlier
classification system based on inch-pound units. This was published in
editions up to 1980.
4.2 Rubber materials shall be designated on the basis of type
(heat resistance) and class (oil resistance). Type and class are
indicated by letter designations as shown in
and
and illustrated in
4.3 Type is based on changes in tensile strength of not more
than 630 %, elongation of not more than – 50 %, and hard-
ness of not more than 615 points after heat aging for 70 h at
an appropriate temperature. The temperatures at which these
materials shall be tested for determining type are listed in
4.4 Class is based on the resistance of the material to
swelling in IRM 903 Oil (most tables were originally devel-
oped using ASTM Oil No. 3) after 70-h immersion at a
temperature determined from
, except that a maximum
TABLE 1 Basic Requirements for Establishing Type by
Temperature
Type
Test Temperature, °C
A
70
B
100
C
125
D
150
E
175
F
200
G
225
H
250
J
275
K
300
TABLE 2 Basic Requirements for Establishing Class by Volume
Swell
Class
Volume Swell, max, %
A
no requirement
B
140
C
120
D
100
E
80
F
60
G
40
H
30
J
20
K
10
TABLE 3 Meaning of Suffix Letters
Suffix Letter
Test Required
A
Heat Resistance
B
Compression Set
C
Ozone or Weather Resistance
D
Compression-Deflection Resistance
EA
Fluid Resistance (Aqueous)
EF
Fluid Resistance (Fuels)
EO
Fluid Resistance (Oils and Lubricants)
F
Low-Temperature Resistance
G
Tear Resistance
H
Flex Resistance
J
Abrasion Resistance
K
Adhesion
M
Flammability Resistance
N
Impact Resistance
P
Staining Resistance
R
Resilience
Z
Any special requirement, which shall be specified in detail
TABLE 4 Suffix Numbers to Indicate Temperature of Test
Applicable Suffix Requirements
Second Suffix
Number
Test
Temperature,
°C
A
A, B, C, EA, EF, EO, G,
11
275
K
10
250
9
225
8
200
7
175
6
150
5
125
4
100
3
70
2
38
1
23
0
B
F
1
23
2
0
3
−10
4
−18
5
−25
6
−35
7
−40
8
−50
9
−55
10
−65
11
−75
12
−80
A
These test temperatures are based on Practice
B
Ambient temperature in the case of outdoor testing.
D 2000 – 08
2
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