Testing Item

Index

Test Method

Superior Grade

First Grade

Qualified

Volatile matter(%)≤

0.*0

0.*0

1.*0

ASTM D****8(GB/T***7)

Ash content(%)

≤0.*0

ASTM D****7(GB/T***8)

Organic acid(%)

3.*0~5.*0

ASTM D****4(GB/T***7)

Soap content(%)

≤0.*0

   ASTM D****4(GB/T***7)

Oil content(%)

*5.3~*9.3

*4.3~*0.3

ASTM D****4 (SH/T***8)

Combinated Styrene content(%)

*2.5~*4.5

ASTM D****5(GB/T***8)

Raw rubber mooney viscosity

ML(1*4)**0°C

*4~*4

*3~*5

*2~*6

ASTM D****6(GB/T***2.1)

Compounded rubber mooney viscosity

ML(1*4)**0°C≤

*0

ASTM D****6(GB/T***2.1)

    ASTM IRB NO.7

**0% Stretching Stress

(**5°C)/MPa

*5min

9.8~*3.8

9.3~*4.3

ASTM D***2(GB/T***6)

ASTM IRB NO.7

*5min

*2.1~*6.1

*1.6~*6.6

*0min

*3.0~*7.0

*2.5~*7.5

Tensile strength

(**5°C, *5min)/MPa

≥*9.4

≥*8.4

Elongationg at break

(**5°C, *5min)/%

≥**0

≥**0