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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.

Information provided by Dow

Vendors:
Available Properties
  • Viscosity Measurement, ASTM D5289, [dNm]; ML, (0.5 RAD)
  • Viscosity Measurement, ASTM D5289, [min]; ts1, (0.5 RAD)
  • Viscosity Measurement, ASTM D5289, [min]; T50, (0.5 RAD)
  • Viscosity Measurement, ASTM D5289, [min]; T90, (0.5 RAD)
  • Viscosity Measurement, ASTM D5289, [dNm]; MH, (0.5 RAD)
  • Mooney Viscosity, ASTM D1646-99 (7.2.2), [MU]; ML 1+4, massed sample
  • Ash, ASTM D5667
  • Collected Volatile Condensable Material, ASTM D5668
  • Storage Temperature
  • Acid Value, ASTM D5775, % Organic Acid
  • Styrene Content, ASTM D5775, Bound Styrene
  • Tensile Strength, Ultimate, ASTM D412, Die C (35 min / 145°C)
  • Tensile Stress at Strain, ASTM D412
  • Elongation at Break, ASTM D412
  • Shelf Life
  
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Manufacturer Notes:
Dow Chemical

Category Notes
Plastic

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Rulon Bearings
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