Classification System for Elastometric Materials

Classification System for Elastometric Materials

Example:  2BA610 A14 C12 L14

While not the part of the specification itself, the following chart presents the assigned material prefix letters and the polymer such prefix would normally call out. This is the conversion equivalent applicable under:

D-2000 and J-200

D-735 and J-14

AA—Natural, SBR, Butyl, Isoprene

R

AK—Polysulphide

SA

BA—Ethylene-Propylene, Heat Resistant SBR and Butyl

BC—Chloroprene-Neoprene

SC

BE—Chloroprene-Neoprene (flower oil swell and comp. set)

BF—Nitrile-E14-E34 Requirements

BG—Nitrile-E51-E61 Requirements

SB

BK—Organic Dihalide (Thiokol)

SA

CA—Ethylene-Propylene

CE—Chlorosulfanated polyethylene (Hypalon)

CH—Nitrile

DF—Polyacrilic (Butyl-Acrylate Type)

DH—Polyacrilic

FC—Silicone

TB

FE—Silicone

TA

FK—Fluorinated Silicone

GE—Silicone

HK—Fluorinated Elastomers (Viton)

1ST DESIGNATE (2)

Grade number – used to designate supplemental requirements beyond 
the basic call out.  Your supplier can develop this.

2ND DESIGNATE (B)

Indicative of heat resistant requirements at which polymer shall be tested.(See Table 1.)

TABLE 1
BASIC REQUIREMENTS FOR ESTABLISHING TYPE BY TEMPERATURE

Test Temperature

Type

°C

°F

A

70

158

B

100

212

C

125

257

D

150

302

E

175

347

F

200

392

G

225

437

H

250

482

J

275

527

3RD DESIGNATE (A)

Indicative of degree of oil resistance as measured by volume swell under test procedures.  (See Table 2.)

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

4TH DESIGNATE (6)

Indicative of hardness required, as 60 + 5 Shore “A”

5TH AND 6TH DESIGNATE (1 & 0)

Indicative of tensile strength required, as 1000 PSI written in hundreds of PSI.

7TH DESIGNATE

The suffix letters (A, C, L) indicate supplemental requirements for particular applications that set up more rigid test procedures – beyond the basic call out.  (See Table 3.)

TABLE 3
MEANING OF SUFFIX LETTERS

Suffix Letter

Test Required

A

Heat Resistance

B

Compression Set

C

Ozone & Weather Resistance

D

Compression Deflection Resistance

E

Fluid Resistance

F

Low Temperature Resistance

G

Tear Resistance

H

Flex Resistance

J

Abrasion Resistance

K

Adhesion

L

Water Resistance

M

Flammability Resistance

N

Impact Resistance

P

Staining Resistance

R

Resilience

Z

Any special requirement to be specified in detail

8TH DESIGNATE

The suffix numbers (14, 12, 14) indicate the ASTM test method applicable by the first digit.  (See Table 4.)

9TH DESIGNATE

The suffix numbers, (in this case 14 – 12 – 14) the second digit denotes the temperature at which the test shall be conducted.  (See Table 4.)

TABLE 4

FOR SUFFIX LETTERS :
A-B-C-E-G-K-L

FOR SUFFIX LETTER :
F

1 = 73 Deg. F.

4 = Zero Deg. F.

2 = 100 Deg. F.

5 = Minus 13 Deg. F.

3 = 158 Deg. F.

6 = Minus 31 Deg. F.

4 = 212 Deg. F.

7 = Minus 40 Deg. F.

5 = 257 Deg. F.

8 = Minus 58 Deg. F.

6 = 302 Deg. F.

9 = Minus 67 Deg. F.

 

10 = Minus 85 Deg. F.

 

11 = Minus 103 Deg. F.

 

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