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Dow Buna® SB 1721 Cold polymerized Emulsion Styrene Butadiene Rubber (E-SBR)

Category Polymer , Thermoset , Rubber or Thermoset Elastomer (TSE) , Styrene Butadiene Rubber
Manufacturer Dow Chemical
Trade Name Buna®
Port Ningbo port,China
Trade Terms FOB, CFR, CIF
Payment Terms L/C, T/T, Western Union
Download PDF Dow Buna® SB 1721 Cold polymerized Emulsion Styrene Butadiene Rubber (E-SBR).pdf
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Material Notes:
Buna® SB 1721 - Schkopau is manufactured by cold polymerization using mixed rosin acid / fatty acid soaps. It is plasticized with 37.5 parts of an aromatic oil in relation to solid rubber. A discoloring stabilizer is added during the production process. Buna® SB 1721 - Schkopau is recommended for tire applications, especially where improved wet grip properties are required. The aromatic oil and high percentage of styrene result in a good miscibility and processing behavior during extrusion and calendaring. Other applications include molded and extruded mechanical goods with low resilience. It is supplied in bales weighing 25 kg. Bales are wrapped in 50 micron PE film. At mixing temperatures above 115°C, the rubber can be processed with the packaging film. Information provided by Dow
Physical Properties Metric English Comments
Viscosity Measurement 2.2

@Temperature 160 °C
2.2

@Temperature 320 °F
[dNm]; ML, (0.5 RAD); ASTM D5289
3.5

@Temperature 160 °C
3.5

@Temperature 320 °F
[min]; ts1, (0.5 RAD); ASTM D5289
7.0

@Temperature 160 °C
7.0

@Temperature 320 °F
[min]; T50, (0.5 RAD); ASTM D5289
12.5

@Temperature 160 °C
12.5

@Temperature 320 °F
[min]; T90, (0.5 RAD); ASTM D5289
16.5

@Temperature 160 °C
16.5

@Temperature 320 °F
[dNm]; MH, (0.5 RAD); ASTM D5289
Mooney Viscosity 53

@Temperature 100 °C
53

@Temperature 212 °F
[MU]; ML 1+4, massed sample; ASTM D1646-99 (7.2.2)
Ash 0.10 %
0.10 %
ASTM D5667
Collected Volatile Condensable Material 0.20 %
0.20 %
ASTM D5668
Storage Temperature <= 30.0 °C
<= 86.0 °F
Mechanical Properties Metric English Comments
Tensile Strength, Ultimate 22.5 MPa
3260 psi
Die C (35 min / 145°C); ASTM D412
Tensile Strength, Yield 13.0 MPa

@Strain 300 %
1890 psi

@Strain 300 %
ASTM D412
Elongation at Break 525 %
525 %
ASTM D412
Chemical Properties Metric English Comments
Acid Value 5.0
5.0
% Organic Acid; ASTM D5775
Styrene Content 40 %
40 %
Bound Styrene; ASTM D5775
Processing Properties Metric English Comments
Shelf Life >= 12.0 Month
>= 12.0 Month
Descriptive Properties Value Comments
Accelerator (TBBS) wt% 1
ASTM 3185-1A
Carbon Black wt% 50
ASTM 3185-1A; IRB 7
Stearic Acid wt% 1
ASTM 3185-1A
Sulfur content, % 1.75
ASTM 3185-1A
Total Extractables % 32.5
ASTM D5774
Zinc Oxide wt% 3
ASTM 3185-1A
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