Expanding foam for mould, solid enough ?

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Expanding foam for mould, solid enough ?

Expanding foam for mould, solid enough ?

Expanding foam for mould, solid enough ?

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TURK	TURK posted 9 Years Ago HOT Topic Details
Group: Forum Members Posts: 101, Visits: 662	Hi all, Anybody used the expanding foam you can buy from the diy stores, in aerosol form. I'd like to know what the difference is between that, and the 2 part stuff available. I understand that the 2 part stuff may be 'closed cell', probably making it harder. But can I get away with using the normal aerosol stuff usually used for insulation purposes ? I'd like to spray it into a form ( female mould ) about the size of a shoe box, then demould the expanded spray foam, and then brush on layers of Pattern-Coat Primer to make it harder to use as a main male mould. TURK Tags expanding foam Insulation Foam mould
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TURK	TURK posted 9 Years Ago HOT Post Details
Group: Forum Members Posts: 101, Visits: 662	Hi Hanaldo, I assume the 'Tg' is the 'Heat distortion temperature' of the resin. No 'Tg' information on the EC Vac-Cast Data Sheet as such, but there is a 'Distortion' figure shown as 80 °C ABS becomes pliable between 88°C & 120°C which is it's 'Glass Transition Temperature' (Tg), varies according to thickness. Forming temps I'll be using should be in the 90°C range for about 90 seconds. So if I manage to make my plug solid enough, I may get away with it I hope the Vac-Cast Epoxy Tooling Resin is up to the task, as it's sold as such 'for vacuum forming tools', as I can hardly send it back now ! Well spotted there Hanaldo, if you hadn't mentioned it I would of been none the wiser ! ....... learn a new thing everyday TURK
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Expanding foam for mould, solid enough ?

TURK - 9 Years Ago

It works ok, but I wouldn't recommend it. It collapses lots, so you end up having to spend hours...

Hanaldo - 9 Years Ago

Thanks Hanaldo I was afraid somebody would say that, but not totally surprised. Is it available...

TURK - 9 Years Ago

Smooth-On are pretty global, I'd be surprised if they don't have a distributor in France or at least...

Hanaldo - 9 Years Ago

Thanks Hanaldo, I did find it in the end, the company do 'Smooth-On' products in France if anyones...

TURK - 9 Years Ago

it can be done, I made new wings for my car using the spray foam. Sprayed, trimmed with a saw to...

jaffa - 9 Years Ago

That's great work jaffa ....... amazing what some people can do. Even to undertake such a task, many...

TURK - 9 Years Ago

I think I found a far better supplier in France for 'Smooth-On' stuff, than the one mentioned above....

TURK - 9 Years Ago

thanks for the comments. Expanding foam was the aerosol from building suppliers, in this case...

jaffa - 9 Years Ago

It's always a good idea to lay a fibreglass skin over a foam pattern/plug just so you can then sand...

Fasta - 9 Years Ago

It's always a good idea to lay a fibreglass skin over a foam pattern/plug just so you can then sand...

TURK - 9 Years Ago

Actual PU foam (not the aerosol stuff) is closed cell, so the pattern coat primer won't harden it at...

Hanaldo - 9 Years Ago

Thanks Hanaldo for your time and expertise, very much appreciated. It makes great sense what...

TURK - 9 Years Ago

Apologies, you had mentioned that's what you were doing, I had forgotten. You might just want to...

Hanaldo - 9 Years Ago

Hi Hanaldo, I assume the 'Tg' is the 'Heat distortion temperature' of the resin. No 'Tg'...

TURK - 9 Years Ago

In essence, the HDT rating of a resin is a pretty useless value for most users, as it is the...

Hanaldo - 9 Years Ago

Hi Hanaldo, I hear you, and totally agree ........ but I haven't got to where I am with my...

TURK - 9 Years Ago

Absolutely agree mate, trial and error is all part of the fun! Honestly your project isn't really a...

Hanaldo - 9 Years Ago

Thanks Hanaldo, I fully understand mate, I did read some of your posts, sounds like interesting...

TURK - 9 Years Ago

Hanaldo, Sorry for the late reply. Just wanted to say that I have used expanding foam to make a...

Zedok - 9 Years Ago

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