How to distinguish high-quality and low-quality silicone wires?

Appearance observation: high-quality silicone wire has smooth surface, uniform color, no peculiar smell, fine and neat stranding of copper core; inferior wire has rough surface, peculiar pungent smell and messy stranding.
Bending test: high-quality wire is soft and resilient after repeated bending without cracking; inferior insulation is hard and easy to crack.
Fire resistance test: high-quality flame retardant silicone wire self-extinguishes quickly after leaving fire; inferior wire burns continuously with open fire.
Conductivity comparison: high-quality tinned copper core has low heating; inferior mixed copper and recycled copper heats seriously.
Certification inspection: regular manufacturers have complete UL, ROHS and environmental protection test reports.