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SYNTHOS Kralex® 1721 Styrene Butadiene Rubber

Category Polymer , Thermoset , Rubber or Thermoset Elastomer (TSE)
Manufacturer SYNTHOS Kralupy a.s.
Trade Name Kralex®
Port Shanghai port,China
Trade Terms FOB, CFR, CIF
Payment Terms L/C, T/T, Western Union
Download PDF SYNTHOS Kralex® 1721 Styrene Butadiene Rubber.pdf
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Material Notes:
KRALEX® 1721 is a standard grade of oil extended styrene butadiene rubber. It is produced by a technology of cold emulsion polymerisation based on soaps of rosin and fatty acids and contains 40% of chemically bounded styrene. It is coagulated by a system of acid and organic coagulant, contains 27% (37 PHR) of extender oil (DAE grade) and is stabilized by a staining antioxidant.It is appropriate for rubber compounds used in the production of car tires and inner tubes, including tire re-trading, conveyor belts, footwear and various technical rubber articles.It is not approved for production of rubber articles coming into contact with foods or drinking water.Synthos was formerly known as Kaucuk. All information provided by Synthos.
Physical Properties Metric English Comments
Volatiles <= 0.75 %
<= 0.75 %
ASTM D5668
Mooney Viscosity 42 - 52

@Temperature 100 °C
42 - 52

@Temperature 212 °F
(15-1.5 min); ASTM D3346
50 - 60

@Temperature 100 °C
50 - 60

@Temperature 212 °F
(1+4); ASTM D1646
Ash <= 0.40 %
<= 0.40 %
ASTM D5667
Mechanical Properties Metric English Comments
Tensile Strength, Ultimate 18.5 MPa
2680 psi
35'/145°C; ASTM D412
Elongation at Break 370 %
370 %
35'/145°C; ASTM D412
300% Modulus 0.0120 - 0.0180 GPa
1.74 - 2.61 ksi
35'/145°C; ASTM D412
Chemical Properties Metric English Comments
Acid Value 4.1 - 5.7
4.1 - 5.7
ASTM D5774
Styrene Content 40 %
40 %
ASTM D5775
Descriptive Properties Value Comments
50% of Vulcanization t' 50 (min.) 6-10
ASTM D5289
Antioxidant Grade Staining
Compound Safety ts 1 (min.) 2.7-5.3
ASTM D5289
Ethanol-toluene Extract (%) 29-35
ASTM D5774
Extender Oil Content (%) 27
Extender Oil Grade DAE
Maximal Moment (dNm) 14.5-18
ASTM D5289
Minimal Moment (dNm) 1.8-2.4
ASTM D5289
Optimal Vulcanization t' 90 (min.) 11-16
ASTM D5289
Soaps content (%) <= 0.3
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