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SYNTHOS Kralex® 1732 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® 1732 Styrene Butadiene Rubber.pdf
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Material Notes:
KRALEX® 1732 is a Specific 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 32% of chemically bounded styrene. It is coagulated by a system of acid and organic coagulant, contains 24.5% (32.5 PHR) of extender oil with reduced content of polycyclic aromatics (MES grade) and is stabilized by staining antioxidant.It is appropriate for rubber compounds used in the production of car tires and inner tubes, including tire re-trading, conveyor belts and various technical rubber articles.KRALEX® 1732 can be used in the same rubber compounds as KRALEX® 1712 if the presence of polycyclic aromatics is not desirable.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 40 - 48

@Temperature 100 °C
40 - 48

@Temperature 212 °F
(15-1.5 min); ASTM D3346
48 - 56

@Temperature 100 °C
48 - 56

@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 3.8 - 6.2
3.8 - 6.2
ASTM D5774
Styrene Content 32 %
32 %
ASTM D5775
Descriptive Properties Value Comments
50% of Vulcanization t' 50 (min.) 6-9
ASTM D5289
Antioxidant Grade Staining
Compound Safety ts 1 (min.) 2.5-4.5
ASTM D5289
Ethanol-toluene Extract (%) 27-32
ASTM D5774
Extender Oil Content (%) 22.5-26.5
Extender Oil Grade MES
Maximal Moment (dNm) 15-19
ASTM D5289
Minimal Moment (dNm) 1.8-2.4
ASTM D5289
Optimal Vulcanization t' 90 (min.) 12-15
ASTM D5289
Soaps content (%) <= 0.3
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