1. Product Name Identification

   • Wire: Should be labeled as "Irradiated Cross-Linked Low-Smoke Zero-Halogen Flame-Retardant Polyethylene Insulated Wire and Cable".

   • Cable: Should be labeled as "Irradiated Cross-Linked Low-Smoke Zero-Halogen Flame-Retardant Polyethylene Insulated, LSZH Flame-Retardant Polyethylene Sheathed Power Cable".

   • Imitations often have slightly different names, such as "Irradiated Cross-Linked Polyethylene Insulated, Low-Smoke Zero-Halogen Sheathed, Flame-Retardant Power Cable", etc.

2. Insulation Surface Heating/Burning Test

   • Apply a soldering iron to the insulation layer; there should be no significant indentation. A large凹陷 indicates issues with the material or manufacturing process.

   • Use a lighter to burn the insulation. Genuine products are difficult to ignite. After prolonged burning, the insulation should remain relatively intact, produce no dense smoke or pungent odor, and its diameter may increase.

   • If it ignites easily, the insulation is likely not LSZH material (it may be polyethylene or cross-linked polyethylene).

   • Significant smoke indicates halogenated materials.

   • If the surface chars badly after prolonged burning and the diameter doesn't increase noticeably, proper irradiation cross-linking was likely not performed.

3. Hot Water Immersion Test

   • Immerse the conductor or cable in 90°C hot water. Normally, the insulation resistance should not drop rapidly and should remain above 0.1 MΩ/km.

   • If the insulation resistance drops rapidly or even falls below 0.009 MΩ/km, it indicates improper or absent irradiation cross-linking.

   • (*This method is not suitable for identifying polyethylene or cross-linked polyethylene insulation; use Method 2 above for those.*)

4. Density Comparison Test

   • LSZH materials have a density greater than water. Strip a small piece of insulation and place it in water. If it floats, it is definitely not an LSZH material.

Irradiated cross-linked LSZH flame-retardant wires and cables have gained widespread recognition among electrical professionals due to their excellent overall electrical and physical properties. They have been used in major national projects like the Beijing Olympics main venues and the Great Hall of the People, demonstrating strong market prospects. However, concerningly, recent years have seen instances of imitation and even counterfeit products, seriously threatening the quality and integrity of key construction projects.