... drainage, mineral petroleum, terrestrial heat heating, no-tower water supply, particular fields of industrial, agriculture and daily life ... as wet motors in fluids which falls into clear water, hot water, acidic, alkali, salt fluid, oil or mixed ... is applied to long-time working in water, PH value 6.5-8.53. PE+PA wire long ... wire is applied to long-time work in water, PH value 6.5-8.53. PP wire long-time ...