Thread: Where do you buy this

Because HD3 is more stable, it will not move with atmospheric moisture changes, HD3 is also rock hard, so will not chip or dent. HD3 is closer to a pure resin then to wood being more akin to perspex or plastic.

I suspect that the wood fibers act to prevent crack propagation, the same idea that the US navy once had to build nuclear powered battleships made from ice mixed with wood-shavings. Making the ships unsinkable.

Have to admit that I had forgotten about HD3. MDF products are available in a range of densities depending on wood species and equipment.

I think the original question was in relation to American high density the link that follows is to Plum Creek which is one of the big US manufacurers. It shows their product range and the data sheets show the densities.

Plum Creek MDF Product Specifications

The usual density for Laminex Craftwood at 18mm thick is 730 kg/m3 or 13.1 Kg per m2. The 18 mm HD3 product is 1200Kg/m3 or 21Kg per m2.
Plum Creek standard MDF is 780 Kg/m3 or 14 Kg per m2.
Plum Creek High density is 890 Kg/m3 or 16 Kg per m2

To the best of my knowledge the 850 to 900Kg density is not available in Australia.

As stated earlier the HD3 product has a primary use in toilet partitions where it competes with compressed fibre cement and compact laminates.At that density it would have a very high resin content, though as the Laminex data sheet states it will still move with humidity changes.

Hi,
As stated I am after some raw HD3 to turn up some bucks for a metal spinner.
Used this stuff in the 90s to do stuff for Skydome and it was turntable on a wood lathe but was also tuff enough for short spinning runs.
Glued it with urea so it wouldn't creep on the layers.
Doing some retro car and bike stuff and would be keen to source this rather than make steel formers. Fuel tank ends and hubcaps etc.
Has anybody 18mm off cuts or does anyone know where to buy the raw board.
H.

As well as High Density Fibreborad there is also a Low Density Fibreboard. I've seen it used to make tops vacuum tables to hold items in place (not for dust extraction). The air flow draws straight through the material so anything with a flat bottom is held fairly well in place.

Amazing. Just did a google search and it appears that MDF comes in a range of densities and they are designated as low, medium and high densities within the overall designation of MDF. Learn something new every day. Although it doesn't sound right, I think the terminology is correct.