Expanding polyurethane foam for plug deisgn?

Talk Composites - The Forum for Advanced Composites

Back

Home
»
Advanced Composites Forum
»
Pattern and Plug Making
»
Expanding polyurethane foam for plug deisgn?

Expanding polyurethane foam for plug deisgn?

Author	Message
20_rc51_00	20_rc51_00 posted 11 Years Ago HOT Topic Details
Group: Forum Members Posts: 95, Visits: 548	Anyone use this type of material in the past? http://www.smooth-on.com/Rigid-and-Flexible/c10/index.html There are various densities, I have tried the 3lb density but it seemed a bit too soft and the surface next to the mold that I poured it in seemed to stay soft and not hard like that exposed to the air. Also the cells on the mold side seemed to crush/pop on their own once pulled from the mold under atmospheric pressue. \ I was thinking that a 8-10lb density would be better for shaping and then surface finishing. Any thoughts or suggestions?
	Reply Like 6
Replies
nmicro	nmicro posted 11 Years Ago HOT Post Details
Group: Forum Members Posts: 15, Visits: 151	Today i tried to make a plug with this material. I went for the Foam-IT 5 (10X expansion). I'm not sure if the low temperature in the shop (15ºC) or incorrect mixing time will bring me problems. The foam has a lot of soft spots an i'm finding very hard to demould. The mould was waxed and with 4 coat of easelease. Matthieu, in what kind of mould did you use the foam? Silicone? Epoxy? Polyester?
	Reply Like 6
Matthieu Libeert	Matthieu Libeert posted 11 Years Ago HOT Post Details
Group: Forum Members Posts: 955, Visits: 3.4K	As far as I know you need another release agent... I've used APW instead of a "normal" composites release agent... I did some tests with a mouldwas and was unable to remove the part... https://www.youtube.com/watch?v=3rRo1nZ2imI In the video above I made a tutorial on how to work with it, the video was with a soft polyurethane but the process is exactly the same with rigid polyurethane Matthieu Libeert Founder MAT2 Composites X Sports website: www.mat2composites.com
	Reply Like 6
20_rc51_00	20_rc51_00 posted 11 Years Ago HOT Post Details
Group: Forum Members Posts: 95, Visits: 548	demold was difficult for me too. I also used a semiperm for release on an epoxy mold. the surface against the mold was softer and the cells crushed very easily, not anywhere as rigid as the surface open to the air.
	Reply Like 6