福利在线国产午夜_国产日韩综合性色av_欧美高清色高清在线观看…_午夜一区二区欧美_免费看黄色视频亚洲_国产精品国三级国产av视色_欧美人与物videos另_精品人妻自慰滋白浆www_欧美综合成人自拍_亚洲a√无码在线观看

How to distinguish the quality of wire and cable? Here comes the trick

      When buying wires for decoration, the one thing we are most concerned about is the cost,and the other is the quality.The quality of the material is related to the quality of the decoration. But many people in life are the first time to decoratecan not distinguish the quality is good or bad, then decoration, how should we distinguish the quality of the wire?

      1.Look at the copper core
      When buying wire, let the boss give a small piece of sample wire, peel and see the copper core inside, if the copper core is bright purple, it is copper, it is very good copper core, if the copper core is bright gold, it is brass, second only to copper, if the copper core is dark, it means that there are impurities in the copper core, the quality is relatively poor.

      2.Look at eccentricity
      Just like the egg yolk looks perfect in the center of the protein, the wire is the same, the copper core of the wire is qualified in the center of the insulation layer, when viewing the sample wire, if the copper core is found to be biased toward the insulation skin, more and less on one side, so that the eccentricity is large, then such a wire can not be wanted, because the eccentricity of the wire is large in the use of the wire is easy to be broken down by the current.
      3.Try bending
      Let the boss take a piece of wire repeatedly bent by hand, good quality wire flexibility is good, repeatedly bending the outer insulation layer will not have traces, poor quality wire looks at the inner core is very sufficient, in fact, mostly made of recycled plastic, repeatedly bending place will turn white, even broken skin.
      4.Test the burn
      Good quality wire insulation is with a certain flame retardant, lit with a lighter, after leaving the open flame is extinguished within 5 to 8 seconds, and there is no thick black smoke and very pungent taste that the flame retardant effect is good, if it has been burning after leaving the open flame and black smoke and very pungent taste, indicating that the quality of the wire is very poor.
      5.Look at identification and stamps
      The national standard requires the production of each roll of wire to have a certificate of qualification, and the wire body and certificate are to write the product name, implementation standards and other details. If it is found that the printing on the thread body and the certificate is not clear, and it is relatively simple, most of the products will not be very good. It should be noted that the certificate of some products is brought on the packaging, like the certificate of overview wire is printed independently on the packaging, but also with the function of scanning the source of goods,such as you buy the overview wire in A store A but the address of the scan code is B place, it needs to be vigilant about whether the products you buy are transiting goods or fake and shoddy products. If it is confirmed that fake and shoddy products are bold to report, can not let fake and shoddy products run rampant.



Previous:2023 Wuhan International Industrial Automation Exhibition
Next:What industry is the product application involved?
+8676985347901~2

Back

国产精品欧美福利久久 | WWW夜片内射视频日韩精品成人 | 欧美综合在线五月天色婷婷 | 亚洲第一AV无码专区 | 国产一级片内射欧美美妇 | 亚洲AV无码电影在线播放 | 国产一区二区在线观看视频 | 国产精品久久久久无码av | 日韩一区精品视频一区二区 | 久久久久国产一级毛片高清版新婚 | 免费无毒a网站在线观看 | 女人高潮一级毛片免费观看 | 国产三区在线成人AV | 亚洲一区二区在线播放日韩 | 天堂资源中文最新版在线一区 | 欧美一本大道香蕉综合视频 | 无码AV在线一区二区三区 | 国产品精十八禁免费的网站 | 久久精品WWW人人爽人人 | 国产69精品久久久久999小说 | 日本精品在线免费观看网址 | 日韩精品久久久肉伦网站 | 美女自慰网站www久久久 | 好爽…又高潮了毛片免费下载 | 在线看片免费人成视频福利 | 国产精品久久久久国产A级 特级丰满少妇一级AAAA爱毛片 | 久久精品WWW人人爽人人 | 中文字幕无线码免费人妻 | 色一欲一性一乱—区二区三区 | 2020国产极品色在线看 | 人妻插B视频一区二区三区 日韩欧美国产2021区一 | 国产精品久久久久永久免费看 | 久久久久久国色aV免费看 | 91人妻人人做人碰人人爽九色 | 特级毛片内射WWW无码 | 99精品视频在线视频免费 | 久久久久久九九精品久小说 | 国产不卡视频一区二区三区 | 日产日韩一区二区在线欧美 | 连续高潮抽搐爽死喷水流白浆 | 久久成人麻豆午夜电影 |