The softening agent is an adjuvant for improving the processability and serviceability of the rubber. It can increase the plasticity of the compound, reduce the viscosity of the compound and the temperature at the time of kneading, improve the dispersibility and mixing, and improve the stretching of the vulcanizate Strength, elongation and abrasion resistance. Softener and plasticizer role is similar, but the plasticizer are made through chemical synthesis, mainly for resin and plastic, softening agent mostly from natural substances, almost all for rubber.
The softening agent is a foam additive with a softening effect at a higher chemical blowing agent. Generally at the same time by reducing the amount of isocyanate and foam hardness to achieve the purpose. They are used primarily for low-index formulations, soluble in water, with more water and less blowing agent in the formulation or complete elimination of physical foaming agents,to obtain the desired foam hardness.