What are the characteristics and identification methods of low-smoke, halogen-free, flame-retardant wires? Many people only know about wires in general, but have limited knowledge of wires for different purposes. To understand low-smoke, halogen-free, flame-retardant wires, we need to learn about their characteristics and identification methods. The detailed explanation is as follows:

What are the characteristics of low-smoke, halogen-free, flame-retardant wires?

Each type of wire has different uses due to its unique characteristics. Therefore, before purchasing low-smoke, halogen-free, flame-retardant wires, let's understand their characteristics.

1. Characteristic of low-smoke, halogen-free, flame-retardant wires - Higher tensile strength than general PVC wires: General PVC wires have a tensile strength greater than 1.05 Kgf/mm², while low-smoke, halogen-free wires have a tensile strength greater than 1.2 Kgf/mm²;

2. Characteristics of low-smoke, halogen-free, flame-retardant wires - Good weather resistance (-30℃~105℃); Good flexibility (hardness 80-90);

3. Characteristics of low-smoke, halogen-free, flame-retardant wires - Non-migratory (because no plasticizers are added to the formula, there is no migration); Does not produce toxic black smoke during combustion (produces a small amount of white smoke); High volume resistivity: PVC wires are generally 1012~1015Ω/cm³, low-smoke, halogen-free wires are greater than 1016Ω/cm³; Good high-voltage resistance: PVC wires generally withstand over 10KV, while low-smoke, halogen-free wires withstand up to 15KV or more; Good elasticity and viscosity.

What are the identification methods for low-smoke, halogen-free, flame-retardant wires?

1. Product Name Identification Method for low-smoke, halogen-free, flame-retardant wires. Wire - Low-smoke, halogen-free, flame-retardant polyethylene insulated wire and cable; Cable - Low-smoke, halogen-free, flame-retardant polyethylene insulated, low-smoke, halogen-free, flame-retardant polyethylene sheathed power cable. Counterfeit products generally have slightly different names, such as polyethylene insulated, low-smoke, halogen-free sheathed flame-retardant power cables, etc.

2. Surface Burning Test for low-smoke, halogen-free, flame-retardant wires. Use a soldering iron to burn the insulation layer. There should be no significant indentation. A significant indentation indicates defects in the materials or process used for the insulation layer. Or use a lighter to burn. Normally, it should not be easily ignited. After prolonged burning, the cable's insulation layer remains relatively intact, without thick smoke or irritating odor, and the diameter increases slightly. If it ignites easily, it can be determined that the cable's insulation layer does not use low-smoke, halogen-free materials (it is likely polyethylene or cross-linked polyethylene). If there is a lot of smoke, it indicates that the insulation layer uses halogen-containing materials. If the insulation surface peels off severely after prolonged burning, and the diameter does not increase significantly, it indicates that appropriate irradiation cross-linking process has not been performed.

3. Hot Water Immersion Method for low-smoke, halogen-free, flame-retardant wires. Place the core wire or cable in 90℃ hot water. Under normal circumstances, the insulation resistance will not drop rapidly and will remain above 0.1MΩ/Km. If the insulation resistance drops rapidly or is below 0.009MΩ/Km, it indicates that appropriate irradiation cross-linking process has not been performed. (Polyethylene or cross-linked polyethylene insulation materials are not suitable for this identification method; the method in item 2 above can be used for identification).

4. Density Comparison Method for low-smoke, halogen-free, flame-retardant wires. The density of low-smoke, halogen-free materials is greater than water. Peel off a small amount of the insulation layer and place it in water. If it floats on the surface, it is definitely not low-smoke, halogen-free material.

This is an introduction to the characteristics and identification methods of low-smoke, halogen-free, flame-retardant wires. After understanding the characteristics of these wires, we can consider ourselves familiar with them. Hopefully, this introduction will be helpful.