KKPC KOSYN KBR 31 Polybutadiene Rubber (High cis BR)

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KKPC KOSYN KBR 31 Polybutadiene Rubber (High cis BR)
Categories:	Polymer; Thermoset; Rubber or Thermoset Elastomer (TSE)
Material Notes:	Polybutadiene Rubber (High cis BR) Characteristics: KBR 31 contains an aromatic oil additive. Polybutadiene Rubber (BR), which has three kinds of bond structure of cis-1,4, trans-1,4, vinyl, is simple polymer made from 1,3-butadiene by solution polymerization, and it is classified to High cis BR and Low cis BR according to the cis-1,4 content. High cis BR containing over 94% cis-1,4 is superior in abrasion resistance, elasticity, age resistance and water resistance. As the secondary transition temperature is about -100? low, it is most widely utilized together with SBR. Applications: Conveyor belting, tires (superior for snow tire tread). Additional Notes: Extender Oil: 37.5; Aromatic Stabilizer: Non-Polluting cis-1,4 Contents: 95% Volatile Matter: 0.3% Ash Content: 0.1% This product is so sensitive to sunlight and humidity that it can be tarnished and caused deterioration of quality if exposed. It is recommended to store it in cool and shady area lest it should be exposed to direct sunlight. Do not expose to incompatible materials or contaminants. Data provided by Korea Kumho Petrochemical Co., Ltd.
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Physical Properties	Original Value	Comments

Density	0.930 g/cc	Not Compounded
Mooney Viscosity	35 @Temperature 100 °C	Raw; ML1+4
	71 @Temperature 100 °C	Compounded; ML1+4; KOSYN KBR31 137.5, ZnO 3, Stearic Acid 2, HAF Black (IRB#6) 82.5, Accelerator TBBS 1.24, Sulfur 1.5 Total: 227.7

Mechanical Properties	Original Value	Comments
Hardness, Shore A	57	Cured; JIS-A
Tensile Strength, Ultimate	192 kg(f)/cm²	Cured
Elongation at Break	640 %	Cured
300% Modulus	82.0 kg(f)/cm² @Strain 300 %	Cured
Rebound	47 %	ASTM
Flex Crack Resistance	6000	De Mettia Flexometer Cut Growth: 2mm --> 15mm, Flexes
Tear Strength	71.0 kg(f)/cm	B-type
Abrasion	0.0040	Akron type Tester (cc/1000rev)
Compression Set	4.0 %	Permanent Set
	13 % @Temperature 70.0 °C	70°C / 22 hrs, 25%, def

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PKKPC26 / 48757

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