15-25mm Calcium Carbide: Physical and chemical properties: ores are solid brown or black block, pure white crystals (including CaC2 higher purple). Density of 2.22 g / cubic centimeter, the melting point of 2300 ° C (with CaC2 content), water immediately intense reaction to generate acetylene, and release heat, Calcium Carbide content varies with the melting point also will change.
Impurities: Caustic soda often contain calcium arsenide (Ca3As2), calcium phosphide (Ca3P2) and other impurities, and the role of water at the same time release arsine (AsH3), phosphine (PH3) and other toxic gases, so the use of Acetylene generated by calcium carbide is toxic.
Crystal structure
The most common crystal form of CaC2 is tetragonal, stable between 298K and 720K. Quartet CaC2 similar to the crystal structure of NaCl, but due to [: C≡C:] 2- ion oval, oriented, the crystal is tetragonal. In CaC2 crystal, the C-C distance is 120pm, which corresponds to the bond length of carbon-carbon triple bond, the distance between Ca and C is 259 and 282pm.
15-25Mm Calcium Carbide,Acetylene Plant Calcium Carbide,Industrial Calcium Carbide,Steel Calcium Carbide Ningxia Tongji International Trade Co.,Ltd. , https://www.tongjiinternational.com
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What is a fire escape rope
Escape rope is a kind of rope tool that can be used in fire to save, save or transfer property. It is flame retardant. The escape rope has a buckle and an insurance card lock, and the tensile strength reaches the national standard. The length of the escape rope is selected according to the user's floor depending on the situation. It is widely used in multi-storey buildings and has strong practicality. Although the escape rope plays a big role in the fire, in fact many people will not be able to use it in an emergency because they will not use it.
This requires the public to learn the relevant knot rope technology and achieve skilled operation after purchasing the escape rope, in order to truly save themselves in the event of a fire. When using the escape rope, firstly, attach one end of the escape rope to a solid place such as a pillar or a railing, then wear the seat belt and then descend it along the wall. At present, the escape ropes sold in the market are basically equipped with a simple descending device, which does not require manual control to reduce the speed. If there is no simple descending device, the knotting method can be used to increase the point of focus and facilitate the decline. In addition, there is a descending device fixed to the wall. When a fire occurs, the public does not need to fix the escape rope. Just wear the seat belt and then descend from the window, balcony, etc. away from the fire.
As for how to purchase qualified escape ropes, the fire department recommends that the public first check the factory certificate, production date and shelf life. For online shopping supplies, the public needs to choose qualified and guaranteed stores.