There are lots of pure aluminium honeycomb panels and 
aluminium/polyethylene panels out there, eg

http://www.multipaneluk.co.uk/?gclid=CL_5lN2xv6cCFRRC4Qod8Cn__Q

They are expensive but very strong.

Forex has passed Oddy tests  and as a non-plasticised PVC is stable 
especially in museum environments and has a long performance lifespan, 
probably exceeding the time the board will be wanted for display etc. It 
does sag under stress with time, so needs vertical or horizontal display 
or some form of support eg aluminium struts on the back. There are 
environmental issues with manufacturing and recycling PVC but this is 
true of aluminium, glass fibre, epoxy resins, and MDF type boards too.

You could use acid-free paper honeycomb boards with say 20mm of the 
honeycomb taken out along the edge and a Forex strip glued in for taking 
screws? The Forex, if glued and fixed at the corners, would act also as 
an edge support and hidden frame? Fiddly but effective.

Will Murray
The Scottish Conservation Studio



On 08/03/2011 16:23, Pippa Cruickshank wrote:
> Can anyone recommend a board suitable for pressure mounting - where you
> need to screw in to the sides of the board.
>
> With the associated fire risks of cutting the aluminium honeycomb
> Aerolam / Hexlite / Cellite 620 board we are no longer able to get it
> cut in-house, and although the manufacturer / supplier in the UK will
> cut it at a cost it would not be cost effective for small boards. ( We
> used to fill the edges with an approved wood filler in order to be able
> to screw into the sides).
>
> I wondered about Forrex Classic board but there still seem to be some un
> answered concerns over the pvc content in the long term.
>
> Apart from covering and sealing wood or MDF with Moistop or Melinex does
> anyone have any other suggestions of possible alternative boards to
> Cellite 620 that you can screw into?
>
> Many Thanks
>
> Pippa Cruickshank
>
> Textile and Fibres Studio
>
> Department of Conservation and Scientific Research
>
> The British Museum
>
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