1

Visual examination

  clean, no cracks, no burrs, clear mark

2

 Verifications of dimension

Length: ≤ +5mm

diameter: ≤+0.1mm

3

Thickness of average copper coating

≥0.254(according to requests)

4

            Bending test

 achieving permanent angular bent of 30 degrees, no pits, no cracks.

5

Resistance rate(Ω) 

resistance rate

≤ 0.059 Ω. mm sq./m

6

 Elongation

≥20%

7

Tensile strength

≥470N/mm sq.

8

Yield point

                                    ≥300N /mm sq.

9

Anticorrosion

dipped in the 10％ nitric acid at least 90hours and loss of corruption 15%