Synthos BUNA™ cis 132 Schkopau High-cis Polybutadiene Rubber (PBR)

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Synthos BUNA™ cis 132 Schkopau High-cis Polybutadiene Rubber (PBR) (discontinued **)
Categories:	Polymer; Thermoset; Rubber or Thermoset Elastomer (TSE)
Material Notes:	BUNA™ CIS 132–Schkopau is a stereospecific butadiene with a high 1,4-cis content. It is manufactured by a solution process using an organo-metallic nickel catalyst which produces a consistent light coloured polymer with low ash content. BUNATM cis 132–Schkopau contains a non-staining stabilizer. Application: BUNATM cis 132–Schkopau is widely used in the tire industry but also in the production of conveyor belts and other rubber articles which are exposed to high cyclical stress. It offers good abrasion resistance, high resilience, low hysteresis, and a low glass transition temperature. BUNATM cis 132–Schkopau offers excellent processability and may be blended with natural rubber and styrene butadiene (SBR), isoprene (IR), nitrile (NBR), or polychloroprene (CR) synthetic rubbers. Due to its non-staining stabilizer BUNATM cis 132–Schkopau is suitable for light-colored rubber articles also when compounded with selected thermoplastics. Synthos acquired the synthetic rubber business from Trinseo in 2021.
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Physical Properties	Metric	English	Comments

Density	0.910 g/cc	0.0329 lb/in³
Volatiles	0.24 %	0.24 %	1 hr at 105°C in a hot air oven, 5 g sample; ASTM D5668
Mooney Viscosity	45 @Temperature 100 °C	45 @Temperature 212 °F	MU, ML 1+4; ASTM D1646
Ash	0.010 %	0.010 %	ASTM D5667

Mechanical Properties	Metric	English	Comments
Tensile Strength at Break	17.4 MPa	2520 psi	Cure: 45 min at 145°C; ASTM D412
Elongation at Break	490 %	490 %	ASTM D412
300% Modulus	9.10 MPa @Strain 300 %	1320 psi @Strain 300 %	ASTM D412

Descriptive Properties
Cis-1,4 content	95 percent		SM (FTIR)
Gel content	3%		SM
Rheometer	11.6 min		tc(90), ASTM D5289
	16.9 dNm		MH, ASTM D5289
	2.7 dNm		ML, ASTM D5289
	5.9 min		ts2, 160°C, ASTM D5289
	8.0 min		tc(50), ASTM D5289
Test Formulation	0.9 Part		Accelerator (TBBS),ASTM D3189
	1.75 Parts		Sulfur, ASTM D3189
	100 Parts		Polymer, ASTM D3189
	15 Parts		Plasticizer, ASTM D3189
	2 Parts		Stearic acid, ASTM D3189
	3 Parts		Zinc oxide, ASTM D3189
	60 Parts		Carbon black IRB8, ASTM D3189

**
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PDWST235 / 142444

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