A, the concept of low smoke halogen-free

Refers to the environmentally friendly cable that does not contain halogens (F, Cl, Br, I, At) and does not contain environmental substances such as lead, cadmium, chromium and mercury made of rubber that does not emit toxic fumes (such as: hydrogen halide, carbon monoxide, carbon dioxide, etc.) when burned.

● Where the halogen pointer is: the value of all halogens ≦ 50PPM (according to the regulation PREN 14582)

● The content of hydrogen halide gas generated after combustion <100PPM (according to the regulation EN5067-2-1)

● The PH value of hydrogen halide gas generated after combustion is dissolved in water≧4.3 (weak acidity) (according to the regulation EN-50267-2-2)

● The transmittance of light through a beam of light after burning in a closed container≧60%(according to EN-50268-2)

● Pb <90PPM, Cd, Cr6+, Hg, PBBs, PBDEs are less than 5PPM

Second, the development trend of low smoke halogen-free wire

A: the traditional PVC wire and cable in the burning will produce smoke containing hydrogen halide, carbon monoxide, carbon dioxide and other toxic gases, which not only affects the smooth progress of disaster relief work, but also to life and property caused by the "second disaster";.

B: The strongest opposition to the application of PVC is in Switzerland, Germany, Sweden, the United States, Japan and other countries whose legislatures and coordinating bodies have enacted strict laws to limit and eventually eliminate the industrial use of PVC.

C: Japan SONY according to SS-00259 regulations in 2005.1.1 began to require suppliers to provide the wire must meet the full range of low smoke halogen-free requirements (except FEP and other high-temperature wire), due to the current low smoke halogen-free plug adhesive and connector part has not been developed, the implementation time pushed to 2005.5.1, Filippo from 2006.1 full replacement, other countries at present There is no explicit provision.

Third, low smoke halogen-free wire characteristics.

(1) tensile strength than the general PVC wire: general PVC wire tensile strength greater than 1.05Kgf/mm2, and low smoke halogen-free wire tensile strength greater than 1.2Kgf/mm2.

(2) Good weather resistance (-30℃~105℃).

(3) With good flexibility (hardness of 80-90).

(4) Has non-shifting property (because this product does not need to add plasticizer in the formula, so it will not have shifting property).

(5) Does not produce toxic black smoke when burning (a small amount of white smoke will be produced).

(6) has a high volume resistivity: PVC wire is generally 1012 ~ 1015Ω/cm3, low smoke halogen-free wire is greater than 1016Ω/cm3.

(7) has good high-voltage characteristics: PVC wire is generally resistant to more than 10KV, while low smoke halogen-free wire up to 15KV or more.

(8) has a good elasticity and adhesion.

Fourth, low-smoke halogen-free wire formula added materials.

Selected wire PE and elastic PE as the main resin, flame retardant material selection of three kinds of metal oxides containing crystalline water: respectively, at 200 ℃, 300 ℃, 300 ℃ above the loss of crystalline water.