1 Scope
This document specifies:
-
— physical and chemical tests on raw rubbers;
-
— standard materials, standard test formulations, equipment, and processing methods for evaluating the vulcanization characteristics of emulsion- and solution-polymerized styrene-butadiene rubbers (SBRs), including oil-extended rubbers.
It applies to those rubbers listed in Table 1 which are normally used in vulcanized form.
Table 1
—
Types of raw styrene-butadiene rubber
|
Rubber
(oil-extended or non-oil-extended) |
Styrene | ||
|---|---|---|---|
| Type of copolymer |
Total content
% mass fraction |
Block content
% mass fraction |
|
|
Series A
Emulsion SBR
Solution SBR
Solution SBR
|
Random
Random
Partial block
|
≤50
≤50
≤50
|
0
0
≤30
|
|
Series B
Emulsion SBR
Solution SBR
Solution SBR
|
Random
Random
Partial block
|
>50
>50
≤50
|
0
0
>30
|