Q&A
FREQUENTLY ASKED QUESTION
Q&A
Fluid resistance
General rule
The fluid resistance test shall be conducted using molded lining and coating test pieces with a small thickness of 2mm and the same degree of vulcanization as the hose.
Oil resistance
When immersed in IRM903 oil at 100℃ for 168h according to ISO1817 test, the volume change rate of 4SP and 4SH type hose liner should be 0%~+60%(that is, no shrinkage is allowed).
When immersed in IRM903 oil at 70℃ for 168h according to ISO1817 test, the volume change rate of the outer coating of 4SP and 4SH hose should be 0%~+100%(that is, no shrinkage is allowed).
When immersed in IRM903 oil at 121℃ for 168h according to ISO1817 test, the volume change rate of R12, R13 and R15 type hoses shall be 0%~+100% for the inner layer and 0%~+125% for the outer layer (i.e. no shrinkage is allowed).
Water resistance
When immersed in distilled water at 60℃ for 168h according to ISO1817 test, the volume change rate of the lining layer of all types of hoses should be between 0% and +30% (that is, no shrinkage is allowed).
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