What is the powder inside mains leads ?

Jan 06, 2007 8 Replies

Hi Guys,



I hope this isn't a stupid question. I'm curious; what exactly is the powder between insulation of the outer sheath and the inner conductors in a mains power lead? I'm talking about the stuff that gets everywhere when you strip a lead to replace a power plug or socket. Its inside every Australian appliance and extension lead I've ever worked on.



Thanks for your help.



DJP


"DJP"

** Looks like talcum powder to me.

Not scented though.

Simply acts as a dry lubricant to make the cable coil and handle nicely.

** Nothing like all of them - IME.

........ Phil

French chalk, which is a variety of talc used a dry lubricant. Also found on new pushbike tubes (or at least it was back in the dim dark ages when I last owned one).

John H

French chalk, that's a technical term for unscented talc. It's often used as a lubricant (by lubricating it makes the cables more flexible)

chemically it's fine grained calcium carbonate powder non toxic, non allergeric, basically harmless.

Bye. Jasen

Talc is actually hydrated magnesium silicate.

Regards, Adrian Jansen adrianjansen at internode dot on dot net Design Engineer J & K Micro Systems Microcomputer solutions for industrial control Note reply address is invalid, convert address above to machine form.

"jasen"

** The kiwi NG plagiarist strikes again .......

** ROTFL !!!

French Chalk = Talc !!

Wonder many " French letters " this "jasen " cretin has read ???

....... Phil

Just curious Bob - why would you, or anyone else, want to hold a stripped cable in your mouth? Shocking thing to do

David

Two Bob wrote:

God only gave us 2 hands, and sometimes we need to hold 3 things at once.

John

As far as I know, the old (circa 1970s)Telecom telephone cables had some sort of rodenticide in them. A mate of mine fell reaaly ill after using the cable for projects, he always used to strip the copper strands of their insulation with his teeth.

- Rob.

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