1, performance: the inner tube of the hose is very hard, now cracked.
Cause analysis: high temperature simply make the inner tube of the plasticizer points out, this is a kind of can make the hose soft can have plastic material. Trapped gas oil can make the inner tube onset of oxidation. This oxidization reaction on the rubber product can make it harden. Oxygen and high temperatures greatly accelerate the hardening of the inner tube of the hose. Attack on the inner tube inside the cavitation phenomenon also has the same effect.
2, performance: the hose inside and outside are cracked, but the elastic material at room temperature is still soft and flexible.
Cause analysis: can be the cause of the hose flexing ambient temperature is extremely low. Most of the norms of the extra temperature of the hose is -40 degrees, some AQP hose extra temperature is -49 degrees, usually the extra temperature of the military hose is -54 degrees, some of the extra temperature of the thermoplastic hose is -54 degrees, the extra temperature of the PTFE hose is -73 degrees.
3, performance: hose cracking, peel off the outer rubber to check the steel wire reinforcement layer found in the entire length of the hose has irregular steel wire cracking.
Cause analysis: this shows that the hose is in a highly frequent pressure shaking. SAE American Automobile Industry Association about two layers of steel wire weaving hose impact test needs to be 133% of the recommended working pressure to reach 200,000 cycles. SAE on the four-layer surrounded by the impact of the hose test needs to reach 500,000 cycles. If the number of thrust pulses in the system exceeds 1 million in a relatively short period of time, it is best to select a hose with reinforcing layers.
4, performance: the hose cracked, but in the entire length of the hose does not show multiple wire cracking. The hose is capable of cracking in more than one place.