Ultra high molecular weight siloxane masterbatch.Acts as a processing aid and as a surface enhancer. As a processing aid, provides improved throughput, improved mold release, improved organic and inorganic filler dispersion, reduced extruder torque/ pressure. As a surface enhancer, provides lower coefficeint of friction, durable scratch and mar resistance, reduced surface roughness of extrusion. Shows compatibility with polyolefins and engineering plastics.