Expanding foam for mould, solid enough ?

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Expanding foam for mould, solid enough ?

Expanding foam for mould, solid enough ?

Author	Message
TURK	TURK posted 10 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
	Reply Like 9
Replies
Hanaldo	Hanaldo posted 10 Years Ago HOT Post Details
Group: Forum Members Posts: 2.5K, Visits: 28K	Apologies, you had mentioned that's what you were doing, I had forgotten. You might just want to be careful with using the casting resin, what sort of high temperatures are you talking about?? Unfortunately aluminium doesn't increase the Tg of the resin, it only increases the stability, so rather than getting hot spots the whole thing will stay at a similar temperature. So if your casting resin doesn't have a high Tg then it still won't be suitable.
	Reply Like 3
TURK	TURK posted 10 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
	Reply Like 4