Type Ⅰ: working temperature below 100 ℃ pure rubber hose and hose.

Ⅱ type: working temperature below 125 ℃ pure rubber hose and hose.

Ⅲ type: working temperature below 150 ℃ pure rubber hose and hose.

In addition, according to the work environment, and each other type of pure rubber hose and hose can be further divided into two levels:

Class A: outer surface of the fuel can not be used and the location of oil pollution pure rubber hose and hose.

Class B: the outer surface can be used for fuel and oil pollution position pure rubber hose and hose.

3.2 Dimensions and tolerances

When measured according to the method GB / T 9573-1994 regulations, pure rubber hose and hose inner diameter and tolerances shall comply with GB / T 9575's.