First of all, start from the appearance of this tape. A rolled wire harness tape should have uniform color, flat section, no convex rolls, and no glue overflow, because if there is glue overflow, it proves that the glue of this tape has aged. However, the thread wound with this kind of tape will loosen by itself in a short time, causing serious consequences of leakage. Then, we can pull off the tape and feel the peeling strength of the tape and the stickiness of the adhesive surface by hand. Generally speaking, the peeling strength of the tape is moderate. If it is too light, it will not be easy to wind the wire, and if it is too heavy, it will be difficult for workers to pull. Open and easily deform the tape. The adhesive surface is more viscous, but it is not as good as possible, because in terms of the characteristics of rubber, the roughness of the adhesive surface proves that the glue is very bad, and it is easy to rot. Finally, we stretched the tape to double the length of the tape, and took a look at the reverse whiteness of the tape. If the color of the tape did not change or only changed a little, it proved that the base material of the tape was not added or only a little filler was added. If the color of the Car Audio & Video Wiring Harnesses tape becomes very white, it proves that in order to reduce the cost, the manufacturer has added a lot of fillers to the PVC base material, which reduces the insulation performance of the tape. Therefore, a roll of wire harness tape with a flat section, moderate stickiness, and no or only a little bit of inverted white is a rolled wire harness tape.