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Elmet Technologies

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Dow Buna® SB 1721 Cold polymerized Emulsion Styrene Butadiene Rubber (E-SBR)
Categories: Polymer; Thermoset; Rubber or Thermoset Elastomer (TSE); Styrene Butadiene Rubber

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.

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Physical PropertiesOriginal ValueComments
Viscosity Measurement 2.2
@Temperature 160 °C
[dNm]; ML, (0.5 RAD); ASTM D5289
 3.5
@Temperature 160 °C
[min]; ts1, (0.5 RAD); ASTM D5289
 7.0
@Temperature 160 °C
[min]; T50, (0.5 RAD); ASTM D5289
 12.5
@Temperature 160 °C
[min]; T90, (0.5 RAD); ASTM D5289
 16.5
@Temperature 160 °C
[dNm]; MH, (0.5 RAD); ASTM D5289
Mooney Viscosity 53
@Temperature 100 °C
[MU]; ML 1+4, massed sample; ASTM D1646-99 (7.2.2)
Ash 0.10 %ASTM D5667
Collected Volatile Condensable Material 0.20 %ASTM D5668
Storage Temperature <= 30.0 °C
 
Chemical PropertiesOriginal ValueComments
Acid Value 5.0% Organic Acid; ASTM D5775
Styrene Content 40 %Bound Styrene; ASTM D5775
 
Mechanical PropertiesOriginal ValueComments
Tensile Strength, Ultimate 22.5 MPaDie C (35 min / 145°C); ASTM D412
Tensile Stress at Strain 13.0 MPa
@Strain 300 %
ASTM D412
Elongation at Break 525 %ASTM D412
 
Processing PropertiesOriginal ValueComments
Shelf Life >= 12.0 Month
 
Descriptive Properties
Accelerator (TBBS) wt%1ASTM 3185-1A
Carbon Black wt%50ASTM 3185-1A; IRB 7
Stearic Acid wt%1ASTM 3185-1A
Sulfur content, %1.75ASTM 3185-1A
Total Extractables %32.5ASTM D5774
Zinc Oxide wt%3ASTM 3185-1A

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PDOW1020 / 30224

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