Synthetic styrene-butadiene rubber

Emulsion polymerized

Test Item

SBR 1502

SBR 1712

Test method

Superior

Qualified

Superior

Qualified

Volatile matter content (%, wt)

≤0.60

≤0.90

≤0.60

≤0.80

GB/T 24131

Ash content (%, wt)

≤0.40

≤0.40

GB/T 4498

Organic-acid content (%, wt)

4.50~6.75

3.90~5.70

3.65~5.85

GB/T 8657

Soap content (%, wt)

≤0.40

≤0.50

GB/T 8657

Oil content (%, wt)

-----

25.3~29.3

24.3~30.3

SH/T 1718

Bound styrene content (%, wt)

22.50~24.50

22.50~24.50

GB/T 8658

Mooney Viscosity

Raw Rubber, ML(1+4)100℃

45~55

44~56

44~54

43~55

GB/T 1232

Mooney Viscosity

Compound Rubber, ML(1+4)100℃

≤93

≤70

GB/T 1232

Modulus at 300% 145℃, 35min (MPa)

16.6~20.6

16.1~21.1

8.8~12.8

8.3~13.3

GB/T 8656, GB/T 528

Tensile Strength

145℃, 35min (MPa)

≥24.5

≥23.5

≥19.4

≥18.4

GB/T 8656, GB/T 528

Elongation at break

145℃, 35min (%)

≥350

≥340

≥460

GB/T 8656, GB/T 528

Appearance

Non-pollution light

yellow rubber

Pollution dark rubber

Visual