Struktol KW 250 A Blend of synthetic hydrocarbons Struktol Plasticizers Rubber - Elastomer (Chloroprene, Butyl …) STRUKTOL ® KW 250A PLASTICIZER A blend of synthetic hydrocarbons. STRUKTOL ® KW 250A is a synthetic hydrocarbon plasticizer with an outstanding low pour point of less than -40 o C. It improves low temperature flexibility for non-polar polymers such as NR, BR, SBR and EPDM. 3 to 30 phr Blend of synthetic hydrocarbons. Used as a plasticizer. Possesses an outstanding low pour point. Improves low temperature flexibility for non-polar polymers such as NR, BR, SBR and EPDM. Use level: 3-30 phr.