Letter 6024

Preventing Copper From Discoloration Inside PVC Cable. 

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Hi,

I have a cable plant, the problem i am facing is that in spite of using bright annealed copper the color turns black or green after the P.V.C coating within 20 to 25 days.Can you suggest any chemical that may be used during the copper drawing or annealing process which can protect the copper from oxidation inside the P.V.C and also does not effect the current carrying capacity.

Any person who can rectify this problem may please help.

Vaibhav Sondhi
Flexolite Cables - Delhi, India.

Dear Vaibhav Sondhi,

Would you please tell me detailed process of P.V.C coating,dose it need high tempreture? if it does, how high? i just want to know what the current discoloration-proof treatment is used. you know BTA(benzontoriazole) is always used for copper anti-discoloration,but sometimes it is not good enough to prevent discolortion for longer time. i have been studying copper discoloration-proof for many years,and there are several kinds of anti-discoloration products, please tell us your present problem detailed as possible.

Thanks,

Ruifeng Bai
- P.R.China

Pl. add copper passivator to solve this problem.

Mathu
- Tirunelveli, Tamilnadu, South India

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