[weaston]

Can anyone suggest a material (Roundbar +- 80mm Dia.) which has a very good thermal conductivity. Mild Steel would be our next choice but it is prone to excessive corrosion. We have been using stainless steel but it takes a little too long to heat up.

The application is heated sealing rollers to seal plastic bags.

[ScottC]

Hi Weston,

We use 99% nickel for applications where we require high corrosion resistance and high thermal conductivity, 35mm dia would be the largest rod we use...nickel is a bit chewy to machine though...not cheap either

regards,

Scott

[Eson]

Graphite maybe? Better thermal conductivity then aluminium and doesnt corrode.

[Geof]

Aluminum inside a stainless steel tube? Get better thermal contact between the two paiecs by using heatsink compound.

[RICHARD ZASTROW]

We used aluminum. Anodize wear surface after machining. If you do this, make sure aluminum alloy and anodizing process are compatible. This was used for horizontal and vertical form, fill & seal bagging machines sealing units.

[Geof]

If anodized aluminum is acceptable get it Hard Coat Anodized. This is possible on 6061 and gives a much thicker anodized layer. It is also possible to bond a Teflon coating to the hard coat, you just need to find an anodizing company that know what they are doing.

[ImanCarrot]

What about copper or a copper alloy?

Gold would be best... or platinum actualy (kidding)