How to distinguish the quality of silicone high-temperature wire?

How to visually distinguish the quality of silicone rubber high-temperature wire? Due to the characteristics of the cable, not all situations can be known from the data of the cable

1. Insulation and Sheath:

(1) The appearance should be smooth and shiny, without visible lumps, bubbles, burnt materials, etc.

(2) The insulation (sheath) thickness is uniform and does not deviate from the core.

(3) No mechanical damage or flattening phenomenon.

(4) There should be no adhesion between the materials of each layer.

2. Conductor:

(1) The appearance should be round and shiny, with a continuous and uniform coating.

(2) The surface of the conductor should not have defects such as triangular edges, burrs, cracks, twists, folds, doping, scars, pits, mechanical damage, corrosion spots, etc.

(3) The color should be uniform and bright, without excessive oxidation marks.

(4) The cross-sectional scale of the conductor is sufficient and not deficient.

3. Other:

(1) The metal shielding layer should be continuous, stacked, and tightly wrapped, without sharp corners, curled edges, or loss.

(2) The cable pitch is suitable and uniform.

(3) Fill fully and round the cable.

(4) Wrapping should be stacked and there should be no curling or loss of edges.

(5) The shape of the cable should be round and smooth, without any flattening, snaking or twisting.

(6) There should be no traces of moisture inside the cable.