Look at the pot surface: The pot surface is smooth, but it is not required to be smooth like a mirror. It is normal to have irregular light lines on the surface, but if the lines are too dense, it is a defective product.
Check point: "Small bumps" can be removed by grinding wheels. The quality of "small pits" is poor. Some pot sellers often use graphite to fill in the "eyes".
Check the bottom of the pot: the smaller the bottom of the pot, the faster the fire is transmitted, saving fuel and time.
Check the thickness: the pot is thin and thick, the thin one is better. When identifying, the bottom of the pot can be turned upside down, with your fingers against the center of the concave surface, and tapping with a hard object. Recognize the "metallographic": a rusty iron pot means that the storage time is longer, and the longer the storage time, the better.
Most of the chemical barrels are made of plastic. They are generally called plastic chemical barrels and plastic chemical barrels. They are made of scientifically developed and blow-molded. They have various colors and beautiful appearance. They have various colors and beautiful appearance. They are resistant to acids, alkalis, corrosion , leaks, and not It achieves the packaging index in terms of fading and non-deformation. It is the ideal choice for the long-distance transportation of chemical product packaging materials.
Plastic chemical barrels have the advantages of integral polyethylene (PE) one-time molding without seams, impact resistance, aging resistance, light weight, no leakage, acid and alkali resistance, long life, compliance with sanitary standards, etc., the use performance is much better than traditional fiberglass Containers, plastic welding containers, steel lined rubber and other containers.
Refers to a compound with a cyano group (CN), in which the carbon and nitrogen atoms are connected by a triple bond. This triple bond gives the cyano group a relatively high stability, so that it exists as a whole in the usual chemical reaction . Because this group has similar chemical properties as halogen, it is often called pseudo-halogen. Inorganic compounds are generally classified as cyanogens, and organic compounds are classified as nitriles. Generally known cyanide is inorganic cyanide, commonly known as shanna (from the English transliteration "Cyanide"), refers to the inorganic salt containing cyanide ion (CN-), can be considered as a salt of hydrocyanic acid (HCN), Common are potassium cyanide and sodium cyanide. Most of them are highly toxic, so they are Well known to the world. Another organic cyanide is formed by combining a cyano group with another carbon atom through a single bond. Depending on the combination, organic cyanides can be classified as nitrile (C-CN) and is onitrile (C-NC). Correspondingly, cyano can be called nitrile (-CN) or isonitrile (-NC). The most common cyanides are hydrocyanic acid, sodium cyanide and potassium cyanide.