在選購之前，為了避免把其他線材錯當雙絞線，所以我們要先學會如何區分雙絞線。

雙絞線的區分

外型構造

雙絞線是由兩根具有絕緣保護層的銅導線組成的，原因是把兩根絕緣的銅導體按一定密度互相絞在一起，每一根導線在傳輸中輻射出來的電波會被另一根線上發出的電波抵消，有效降低信號干擾的程度。

導體材料

一般比較好的雙絞線都是以純銅為主的，但是有些不法商家會使用參雜了鐵或鋁，或者其他合金的雙絞線，這樣會影響雙絞線的傳播效果。如何判斷雙絞線的導體材料：

① 呈均勻黃金色，是用純銅作為導體材料;有明顯的白色雜點或黑色，就是參雜其他金屬;

② 用陽火燒導體，擦去變黑的部分後仍保持原來的顏色，是採用純銅導體材料;如果含鐵無論你怎麼擦它都是暗淡的黑色。

關於內層絕緣部分

可空套拔出一段，再兩邊用手捏緊向兩邊拉伸，拉伸度越長，料質越好;本身顏色鮮艷，表面光滑。

關於外層絕緣體

護套表面顏色均勻緊密，橫截麵灰白分明不含雜質;料身撕開不帶絲，線擺直往下撕容易拉開，便於剪接;橫面撕開難為保護作用，兩種撕開不同證明材料原裝。

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The distinction between twisted pair

Appearance structure

Twisted pair is composed of two insulated copper wire with insulation layer, because the two insulated copper conductors twisted together at a certain density, each wire in the transmission of radio waves will be the other The waves sent off the line offset effectively reduce the degree of signal interference.

Conductor material

Generally better twisted pair are pure copper-based, but some unscrupulous businesses will use mixed with iron or aluminum, or other alloy twisted pair, which will affect the spread of twisted pair. How to determine the twisted pair of conductor material:

① uniform gold color, is the use of pure copper conductor material; obvious white noise or black, is mixed with other metals;

② with the sun burning conductor, after wiping off the black part of the original color is still maintained, is the use of pure copper conductor material; if the iron no matter how you rub it is dim black.

about the inner insulation part

Can be drawn out of a set of empty, and then squeezed both sides of the hand squeezed to both sides, the longer the stretch, the better the quality; itself brightly colored, smooth surface.

about the outer insulator

Sheath surface uniform color, cross-section gray and clear without impurities; body tear without silk, the line straight down to tear easily opened, easy to splicing; horizontal tear is difficult to protect the role of the two tear different proof Material original.

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