However, many material manufacturers use low-priced and inferior antimony trioxide containing arsenic trioxide (commonly known as "arsenic") to deceive many optoelectronic cable manufacturers. Antimony trioxide is produced by calcination and oxidation of antimony ore (Sb2O3), Sb2O3, purified to remove arsenic and iron, then reduced to metal antimony with carbon, further smelted and purified, and then oxidized to obtain pure Sb2O3. Antimony and arsenic are brothers. Therefore, repeated purification is required to remove arsenic.
At present, the arsenic content of high-purity antimony trioxide in China is controlled at ≤300ppm, but antimony trioxide that has not been repeatedly purified is also in the market because it is cheap! Currently on the market, antimony trioxide with a purity of more than 99.5% They are all above 55,000 yuan/ton, while the so-called antimony trioxide that has not been purified has a price of only 15,000 yuan/ton, which is nearly four times the price difference.
If it is added at 5% in the formula, the price difference of only this material will be 2,000 yuan/ton, but this is by no means a terrible point of cutting corners. The real horror is much more serious!
As we all know, arsenic trioxide has long been banned by REACH, but such toxic raw materials are still used by most domestic material manufacturers. Many cable manufacturers do not know why they are used, and the procurement standards do not require environmental protection, in exchange for harm and hidden dangers to frontline personnel and society.
2. The so-called low-smoke halogen-free flame-retardant material refers to the use of a flame-retardant material that does not contain halogen and has a small amount of smoke. Conventional flame retardants include aluminum hydroxide, magnesium hydroxide and phosphorus-nitrogen flame retardants, but not halogen and other heavy metal salt flame retardants.
However, the quality of the materials currently used in China is uneven, and it is not only unable to meet the physical requirements, but even most of the sheaths use non-flame retardant calcium carbonate as filling or directly use recycled low-smoke halogen-free waste materials.
The service life of the optical cable using recycled plastic as the sheath needs to be evaluated. The biggest hazard is that it is easy to age and crack, and it cannot effectively protect the core of the optical cable, which greatly reduces the service life of the optical cable.
Third, talk about polyethylene recycled materials. Recycled materials are used as waste products in the name of environmental protection.
Regardless of the impact of such use on the market order, the product itself has huge risks. Even if the additives are added again, the defects generated in the material cannot be compensated, so the service life will be much lower than that of the new material, and even aging and cracking in a short period of time may occur.
Because of the uncertain source of plastic products and scraps, it contains many impurities, the molecular chain has been partially broken, the quality is very unstable, and the physical property gap between batches is large; mechanical and electrical properties such as tensile strength and toughness All aspects are far inferior to brand-new materials;
In addition to the gaps in the properties of these materials, the biggest difference is in the use. Because recycled materials contain more impurities, non-decomposable inorganic substances, etc., the surface of the product after extrusion will appear rough, matt, or even particles. Compared with the new material, the smooth and delicate surface has a serious impact on the appearance of the product. , The service life will be much lower than that of brand new materials, and even aging and cracking will occur in a short time.
Fourth, the soft PVC material has good electrical mechanical physical and electrical properties, wide resources, low price, and is widely used in all kinds of wires, cables and optical cables. However, in the past ten years, some cable material companies have used inferior and low-priced so-called substitute plasticizers to produce low-priced PVC cable materials that seriously do not meet the requirements of the standard.
The most commonly used PVC cable material is the so-called epoxy fatty acid methyl ester, which is actually epoxy "ditch oil", which is a kind of chemical product made by oxidation treatment of various kinds of drain oil. What is the result of adding it to the cable material, and what are the hazards to the performance of the material and the long-term use of the cable?
epoxy fatty acid methyl ester, its flash point is 170～190℃, and it has certain compatibility with PVC resin. After adding PVC, there is a great risk of precipitation, which manifests as oil in summer and frost in winter. According to different formulas and processing techniques, the precipitation time is also different, some of them show up in one or two months, and some may take one or two years, or even several years.
Cables made of such materials will continue to see oil and whitening as the laying time increases. In addition, as the added amount increases, it is easy to cause unqualified thermal aging quality loss, and large added amount causes serious unqualified.