1.Material:Steel wire meets requirements of GB699-99,liner and jacket meet requirements of the specified grades;
2.Steel wire winding direction:left handed or right handed, the pitch is only for reference;
3.No floating line phenomenon,and there is a certain straightness and rebound resilience after wire winding;
4.Bending degree:1000mm long product is in a vertical drop at free status,the lower end deviation is within 200mm;
5.Jacket is smooth with uniform thickness, and no defects as impurities, bubble, embossment ect.;
6.Reducibility: fix casing horizontally, extend 500mm long and bend front end to 90 degree angle, then relax out, and later the bended part must recover to less than 45 degree angle horizontally with surface;
7.Cutted product with length of 1000mm, its inner tube shrinkage should be within 1mm;
8.Jacket’s thickness deviation (same section:Max. wall thickness minus Min. Wall thickness) is under 0.15mm.