As with hose and couplings, crimp ferrules are subject to maximum pressures, temperatures, and mechanical forces like end-pull. As a rule, the higher the temperature, the lower the maximum pressure rating for crimp ferrules. Normal operating conditions are -40F to 70/F, above that the crimp ferrule integrity will diminish.
Temperature affects both – the media and the environment. Always test or certify critical application hoses prior to field use.