1. Antimony trioxide is a special high-quality flame retardant in flame retardant polyvinyl chloride and flame retardant polyethylene. Because of its excellent flame retardant synergistic effect with halogen, it can improve the oxygen index of materials and the self-extinguishing property of raw materials.

But many material manufacturers use cheap counterfeit antimony trioxide with "arsenic trioxide, alias arsenic" to confuse many optical cable factories. Antimony trioxide is Sb2O3 produced by calcination and oxidation of stibnite (Sb2O3). It purifies and removes arsenic and iron, converts carbon into metallic antimony only, deepens smelting and purification, and then oxidizes to pure Sb2O3. Antimony and arsenic are brothers, so it must be repeatedly extracted to remove arsenic.

At present, the arsenic content of high purity antimony trioxide in mainland China is controlled at < 300 ppm, but antimony trioxide which has not undergone repeated refining also has a market, due to the low price! At present, the purity of antimony trioxide in the market is about 99.5%, which is about 55,000 yuan/ton. However, the market price of antimony trioxide, which has not been refined, is only 15,000 yuan/ton, and the market price difference is nearly four times.

If inserted according to 5% of the secret recipe, not only the material itself, but also the price will be 2,000 yuan/ton apart, but this is by no means the scary point of the second best. The real act of terror, much more serious!

What is arsenic trioxide? The following quotes from Sogou Encyclopedia: "Arsenic trioxide, commonly known as arsenic, chemical formula As2O3, is the most valuable arsenic compounds and important starting materials for arsenic chemistry. It is also one of the oldest radioactive materials, odorless and odorless, the shape of white frosty debris, so it is named arsenic. It is a highly carcinogenic by-product formed during the operation of a variety of specific ores, such as gold mining, high temperature distillation of arsenopyrite (arsenopyrite) and condensation of its white smoke.

Obviously, arsenic trioxide has been banned by REACH, but this toxic raw material is still used by most raw material manufacturers in mainland China. Many cable manufacturers do not know why they use it. Purchase specifications do not conform to many aspects of environmental protection, in return for damage and risk to grass-roots workers and society.

2. The said low smoke halogen-free flame retardant material, also known as the use of halogen-free, small smoke volume of certain flame retardant materials. The basic flame retardants are aluminium hydroxide, magnesium hydroxide and phosphorus-nitrogen flame retardants, not halogen and other heavy metal salt flame retardants.

However, the current domestic application of raw materials, good and uneven quality, has long been not only unsatisfactory physical property requirements, and even the vast majority of sheaths using Non-Flame-Retardant calcium carbonate as filling or direct use of recycled low-smoke halogen-free waste secondary materials.

Optical cables made of this material have excellent flame retardant performance, little smoke when ignited and no corrosive gas escaping. Therefore, they are applied to nuclear power plants, light rail passenger stations, telephone exchanges and computer control bases, multi-storey buildings, shopping centers, hotels, radio and television stations, major military facilities, petrochemical platforms, etc. All kinds of workers are relatively dense, and the air is relatively dense. Low density occasions.

The halogen-free and low-smoke, low-halogen and low-smoke characteristics of optical cables, when fire occurs, the diffusion is very slow, smoke concentration is low, visibility is high, harmful substances release is small, which is conducive to staff evacuation. But now the materials used in our country are uneven, which is not only unable to meet the physical property standards, so that most of the sheaths use Non-Flame-Retardant calcium carbonate as filler or recycle low-smoke halogen-free materials directly.

At this stage, it is understood that the key types of optical cables involving the application of recycled materials and calcium carbonate filling instead of flame retardant sheaths are butterfly-shaped optical cables, low-voltage cables, video cables, railway signal cables, etc. Mainly used for track or indoor buildings and other sites. The sheath filled with calcium carbonate is not only non-flame retardant, but also flammable at times. It is also unable to meet the requirements of flame spreading speed and smoke emission. The fundamental purpose is to reduce costs for the sake of benefit, and to be indifferent to the quality of the project.

The service life of optical cables with recycled plastics as sheath needs to be evaluated, and the greater hazard is also the most prone to aging and cracking. The core of optical cables can not play a reasonable protection function, so the service life of optical cables is greatly reduced.

3. Otherwise, polyethylene recycled materials. Recycled materials themselves use waste goods in the name of environmental protection. The harm caused by such application in the field of market order is not to be questioned, but the goods themselves have immeasurable harm. Even if the additives are added again, the defects in the material can not be recovered, so the service life of the material will be larger than that of the new material, and even the condition of aging and cracking will occur in a short time.

When it comes to recycled materials, people always ask what is the difference between new materials and recycled materials? Recycled material is made of plastic products, corner waste recycling and crushing, adding additives, and re-granulating.

Due to the origin of uncertain plastic products and corner wastes, there are many impurities, unstable quality and great differences in physical properties between batches; mechanical and electrical properties of tensile strength and toughness are not as good as those of brand-new materials; the color of products is too deep, dark and glossy; most of the recycled materials have a pungent odor, and some have a strong taste similar to detergent. It's the pungent smell.