One look, two tests, three weighings, four price ratios, and five seeing bronzes, five strokes are clear.
Nowadays, the application of wire and cable is more and more extensive. Along with it, there are more and more types of wires and cables sold on the market. Then, how do we distinguish between the "national standard" and "non-standard" wire and cable? To this end, senior experts in the industry were consulted. They gave five methods for distinguishing national and non-standard wires and cables:
A look: to see whether the wire and cable products have quality system certification, see whether the certificate is standardized, see if there is a factory name, site, inspection chapter, production date, see if the wire is printed with trademarks, specifications, voltage and so on. Also look at the cross section of the wire copper core, superior product copper color bright, soft color, otherwise it is defective.
Second test: It is advisable to bend one wire repeatedly by hand. The soft hand, good fatigue resistance, plastic or rubber feel elasticity, and no crack on the wire insulation are superior products.
Three weighs: good quality wire and cable, generally every 100m weight is within the specified weight range. For example, a commonly used plastic insulated single strand copper core wire with a cross-sectional area of â€‹â€‹1.5mm2 is 1.8-1.9kg per 100m; a 2.5mm2 plastic insulated single stranded copper wire is 3-3.1kg per 100m; 4.0mm2 plastic Insulated single-stranded copper wire weight is 4.4-4.6kg per 100m. Poor quality wires have insufficient weight or are either of insufficient length or have too many impurities in the wire copper core.
Four-price ratio: Because of the low cost of producing counterfeit and inferior electric wires, when selling, traders often sell at a low price for good and cheap, which makes people gullible. Therefore, be careful when buying, don't be fooled by the â€œhigh quality and low priceâ€ advertised by the business, and finally be deceived.
Five to see the copper: qualified copper core wire copper core should be purple, shiny, soft to the touch. The shoddy copper core copper core is purple-black, yellowish or white, with many impurities, poor mechanical strength, and poor toughness. It will break when it is hardened, and the wire is often broken. In the inspection, you just strip the wire for a while and then use a piece of white paper to make a slight twist on the copper core. If there is black material on the white paper, it means that there are more impurities in the copper core and you can identify it as "non-standard. "Wire and Cable.
Inorganic acid, also called mineral acid, is the general name of acids in inorganic compounds. Inorganic acids, in general, are inorganic compounds that dissociate hydrogen ions.
According to the composition, inorganic acids can be divided into oxic acid, anoxic acid, complex acid, mixed acid, superacid, etc. According to the degree of dissociation, they can be divided into strong acid and weak acid, as well as monobasic acid according to the number of hydrogen ions that can be ionized in the molecule,dicarboxylic acid and polyacid. Inorganic acids are mostly used to provide hydrogen ions.
The inorganic acids can be summarized as three main aspects:
1. Generally, salt is combined with some inorganic acids such as potassium, sodium and calcium, and some with alkaloids.
2.Among inorganic acids,fatty acids combine with glycerol to form esters or higher alcohols to form wax.
Inorganic acids Cautions:
1. Inorganic acids are corrosive, when use them,please care not to touch, splash on the skin.
2. Some inorganic acids can cause poisoning through respiratory stimulation, so we should pay attention to protection.
Inorganic Acids,Hydrofluoric Acid,Inorganic Phosphoric Acid,Inorganic Salt Oxalic Acid
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