What is the difference between these two types of tubing: TT-175 and TT-ГСМ?

Both types are recommended for usage in high-temperature environments; they are also resistant to mechanical stress and friction and oil-resistant. The material is different for each type. TT-175 is made of PTFE, TT-ГСМ is made of elastoplastic. Elastoplastic is more flexible than PTFE. TT ГСМ tubing is black, TT-175 is transparent, which is useful for control of the connection after shrinkage. TT ГСМ is recommended for usage in the automobile sphere, TT-175 was designed for aerospace industry.