Buna® CB

Neodymium Butadiene Rubber

Neodymium catalyzed polybutadienes are highly elastic polymers with a very high degree of resistance to dynamic stress, and retain these properties even at extremely low temperatures. They have a very high 1.4-cis content together with a very low 1.2-vinyl content, a relatively narrow molecular weight distribution and a low degree of branching.


Typical applications are tires, conveyor belts, caterpillar tread blocks, golf balls, footwear soles, V-belts etc. They can be blended with NR for goods having thick sections and requiring high resistance to reversion, e.g. buffers, roll covers needing high abrasion resistance, seals, profiles and other goods.

Provided that the compounds are formulated and processed correctly, the vulcanizates have good resistance to aging, reversion, abrasion and flex cracking, good low temperature flexibility and high resilience.

Main Grades

NameML 1+4remark
Buna® CB 2173highly linear
Buna® CB 2263highly linear
Buna® CB 2444highly linear
Buna® CB 2544long chain branched
Buna® CB 29 MES37MES-oil extended
Buna® CB 29 TDAE37TDAE-oil extended


David Hardy
Technical Service - EMEA

Phone: +49 221 8885 6307

Judy Douglas
Technical Service - NAFTA

Phone: +1 412 809 3547

Marcus Moutinho
Technical Service - LATAM

Phone: +55 21 2677 1219

Esther Han
Technical Service - APAC

Phone: +65 6725 5777