Measuring instrument storage.

[MacolmParticipant @macolm]

Ultra high molecular weight polythene (UHMWPE) has notably low permiability to water and other vapours. Many plastics have quite high absorption and transmission of vapour. However, silicones including RTV are particularly bad, an order of magnitude worse than common plastics.

Edited By Macolm on 22/09/2023 15:01:10

[duncan webster 1Participant @duncanwebster1]

I use IKEA chopping boards when I want machineable flat plastic. They are about 8mm thick from memory. SWMBO actually like going there, I absolutely hate it. The way they try to make you go through the whole store is maddening.

[Robert Atkinson 2Participant @robertatkinson2]

Chopping boards are generally made from the Ultra high molecular weight polythene (UHMWPE) mentioned by Macolm. Also useful as neutron moderators

Robert.

Edited By Robert Atkinson 2 on 22/09/2023 16:58:44

[GeorgineerParticipant @georgineer]

Posted by duncan webster on 22/09/2023 16:17:31:

I use IKEA chopping boards when I want machineable flat plastic. They are about 8mm thick from memory. SWMBO actually like going there, I absolutely hate it. The way they try to make you go through the whole store is maddening.

My son was quite shocked when I bypassed a large part of an Ikea store by nipping through the café.

George

[duncan webster 1Participant @duncanwebster1]

Purely by coincidence it was announced after tea that I had to go to IKEA to look at a bed for #1 son. Talk about the outer circle of hell! I am going to do my utmost never to go again, but if I am instructed by senior management I'll take the dog, it will be good exercise for him. At one point I threatened to just follow the fire exit signs, opening the fire doors along the way, but was talked out of it. They should realise that their ploy of making you go through the entire store actually puts people off. I'd willingly pay extra to a normal department store where I can go straight to the bit I want, and then leave. I thought the Trafford Centre was bad, but at least you can escape.

[PeteParticipant @pete41194]

There's some woods, glues and sealants that continue to produce acidic fumes even after fully curing. Oak is just one of those wood species that does. British or European oak may or may not be different than American, but I haven't checked there exact properties. Part of engineering is understanding the positives and negatives for anything that might be unfamiliar that your using. And yes like it or not, were not immune from having to know about those as well. Fortunately for us, the internet makes doing so fairly easy today. And the more you learn, the easier it is to understand what to look for and how to find it. There's no such thing as the perfect material, everything we have available will have built in compromises involved. About all we can do is chose something that has the least amount of those verses there expected life span and cost against what it's intend for or to do.

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