Physical methods are used to quickly distinguish standard high-temperature lines from non-standard high-temperature lines:
Good quality UL electronic wires are generally within the specified weight range. Such as commonly used PVC insulated multi-strand copper core wire with a cross-section of 0.35, each coil weighs 3.5-3.6kg; 0.85 PVC insulated multi-strand copper wire, each coil weighs 5.3-5.40kg, etc. Poor quality wires have insufficient weight, either insufficient length, or excessive impurities in the copper core of the wires, and there are still many voids in the cross-sectional area of the PVC layer of the wire sheath, which has an uneven texture.
The copper core of the qualified copper core UL electronic connection wire should be fuchsia, shiny and soft to the touch. Inferior copper core wires are purple-black, yellowish or white, with many impurities, poor mechanical strength, and poor toughness. They will break with a little force, and the wires are often broken. During the inspection, you just need to peel off the end of the wire by 2cm, and then rub the copper core with a piece of white paper. If there is black matter on the white paper, it means that there are more impurities in the copper core. In addition, the shoddy wire insulation seems to be very thick. In fact, most of it is made of recycled plastic. Over time, the insulation will age and leak electricity.
3.Look at the manufacturer
Counterfeit and shoddy UL electronic wires are often "three-no-product", but they also have ambiguous origins, such as Made in China, a province or a city in China, which is actually equal to the unmarked origin. And the outer packaging of the wire is not affixed with a small UL blue label issued by UL.