Please I want to find out the exact propotionate or percentage mixture of grafted PVC/Catalyst materbatch/Colour masterbatch in producing an XLPE Copper conductor.
Thank you.

Hello Chidiebereafor,

Just so you, I and the readers are all on the same page, I believe you are talking about Process "c" as described below:

Process "a" - The purchase or manufacture of a very clean LDPE or LLPE which has been compounded (pre-grafted) with vinyl silane. This first step is done in a mixing extruder and includes accurate mixing with a peroxide initiator and an antioxidant before pelletizing. We will call this compound "A".

Process "b" - The purchase or manufacture of a catalyst masterbatch produced by the accurate mixing a very clean LDPE or LLPE compounded with an organo tin catalyst such as di-butyl tin laureate and then pelletizing. We will call this compound "B".

Process "c" - The accurate mixing of compound "A" with the catalyst masterbatch (Compound "B") and a color masterbatch by gravimetrics at a regular PE extrusion line.

Process "d" - The wire or cable insulation is cross linked in a steam room, in boiling water or just by leaving it in a normal plant environment for some period of time.

Please clarify if we are incorrect!

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It is unlikely however that any wire and cable company will provide you with the information you are seeking because it is part of their "know how" and they will not give it up freely. On the other hand, your color masterbatch supplier and your catalyst masterbatch supplier should be able to tell you the percentage by weight they recommend to properly achieve the color and the degree of cross linking described in Process "d".

The degree of cross linking and color verification is by normal laboratory procedure and local standards.

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I believe this is all the information you require.

Kindest regards,
Peter J. Stewart-Hay
Principal
Stewart-Hay Associates
www.Stewart-Hay.com

I haven't received a reply to my last mail on the XLPE compound mixture.

Thank you
Mr C. Afor

Hello again Chidiebereafor,

Somehow, I don't think you understand how this technical forum works.

If we do not have the exact answer to your question, we will hopefully be able to point you in the right direction so you can find out the exact answer for yourself, at least in the short term.

We thought we already did that in our previous post on October 27, 2005.

After that, and in the longer term, someone may come across your particular thread and provide you with more precise information.

As we already stated, we doubted if anybody was going to provide you with this "know how" information but we did give you the way you could find out for yourself.

We believed all you had to do was follow it up.

Please understand that nobody is obliged to answer you. Everyone is a volunteer here.

Kindest regards,
Peter J. Stewart-Hay
Principal
Stewart-Hay Associates
www.Stewart-Hay.com

Hi,

In PVC compounding, you can use %1-2 masterbatch if your subcontractor uses Ciba pigments.

In XLPE ,you can use PE masterbatch, approx %1.

If you want to produce XLPE compounds you should contact with MARIS(Italy),ICMA(Italy) and COPERION
www.icmasangiorgio.it www.mariscorp.com www.coperion.com