... is widely used in the checking well of cables, waist water, electrics, gasespipes underground. Featuress: 1) Against theft: the material is ... at 60 centigrade for 16 hours,then put it into cold storage at -40 centigrade for 2 hours, the features of ... at 60 centigrade for 16 hours, then put it into cold storage at -40 centigrade for 2 hours, the result is ...