Sub is a processing aid that improves the processability of rubber. It has the effect of preventing stickiness and shrinkage in rubber compounds.
It is recognized as a formal rubber term and is included in JIS and rubber dictionaries. The term "sub" is also referred to as "Factice," which is derived from French and means "synthetic" or "artificial," and is now used as a global common term. Therefore, we use this term in our company's English name. Additionally, there are terms such as "vulcanized vegetable oils" or simply "vulcanized oils," which are translations of the term primarily used in the United States and represent the raw materials and manufacturing methods of sub.
【Three Major Features of Sub (Factice) Not Found in Other Processing Aids】
■ Non-thermoplastic
It does not melt at around 200°C, thus maintaining the shape and dimensions of the compound and preventing shrinkage.
■ Pressure flowability
During the pressurization of the compound, the lubricating effect of factice improves flowability, making extrusion easier and increasing molding speed.
■ Oil absorption
Due to its three-dimensional mesh structure, it absorbs liquid formulations (oils, plasticizers, etc.), preventing stickiness and bleeding of the compound.
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