SYNTHOS Kralex® 1739 Styrene Butadiene Rubber

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SYNTHOS Kralex® 1739 Styrene Butadiene Rubber
Categories:	Polymer; Thermoset; Rubber or Thermoset Elastomer (TSE)
Material Notes:	KRALEX® 1739 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 40% of chemically bounded styrene. It is coagulated by a system of acid and organic coagulant, contains 27% (37 PHR) of extender oil with reduced content of polycyclic aromatics (TDAE 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 and various technical rubber articles. KRALEX® 1739 can be used in the same rubber compounds as KRALEX® 1721 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.
Key Words:	SBR
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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

Chemical Properties	Metric	English	Comments
Acid Value	4.1 - 5.7	4.1 - 5.7	ASTM D5774
Styrene Content	40 %	40 %	ASTM D5775

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	12.0 - 18.0 MPa @Strain 300 %	1740 - 2610 psi @Strain 300 %	35'/145°C; ASTM D412

Descriptive Properties
50% of Vulcanization t' 50 (min.)	6-10		ASTM D5289
Antioxidant Grade	Staining
Compound Safety ts 1 (min.)	2.5-4.5		ASTM D5289
Ethanol-toluene Extract (%)	29-35		ASTM D5774
Extender Oil Content (%)	25-29
Extender Oil Grade	TDAE
Maximal Moment (dNm)	15-18		ASTM D5289
Minimal Moment (dNm)	1.8-2.6		ASTM D5289
Optimal Vulcanization t' 90 (min.)	11-16		ASTM D5289
Soaps content (%)	<= 0.3

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