Working with urethane for body parts

General Composites Discussions Composites Talk
#1

I was wondering if any one could provide more information on working with a urethane for body parts. How it would work when using it in a mold.

Thanks

#2

The only Polyurethane body parts I have seen made were injected into a clam shell closed mold. For a wing, a pre formed foam with surfacing veil was inserted first before closing and injecting.

JM

#3

Are you referring to urethane bumpers and stuff like that?

#4

Yes. Which the part we have been talking about is urethane. After I have a mold of the part I would like to make more out of urethane. Which I think would be easier then making them all by fiberglass and would allow them to be more flexable.

#5

It does take an expensvie piece of equipment to mix and pump each of the 2x parts up to the nozzle and then the disposable tip does the mixing.

Evan, I hope you don’t get mad for me posting this company that makes this equipment but they just donated a bunch of 2 part foam (20 gals) and 2 minute PUR casting resin (20 gals) to my class. www.bjbenterprises.com and ask for Tina in sales, tell them “JM” referred you.

#6

Actually JM I do mind. JK. I would have recommended BJ Enterprises too. In fact, I’m all for “BJ” anything in general :wink:

#7

Evan, get your stick out of the gutter…it is BJB not BJ: blow Job

:roll:

#8

My bad, don’t tell me you don’t at least think about it every time to see the letter B and J next to each other in that order. :slight_smile:

#9

So does any one have more information on pouring this into a mold?

#10

You’d have to inject it. Pouring it into the cavity mold won’t work I don’t think.

#11

There are pouring resins out here but I don’t have a scource. rotomolded fuel cells use it. It is poured into a mold and put into a rolling machine that rolls the mold around until the stuff cures, the mold is open and out pops a cell.

#12

Ok there has to be an easier way then but avoiding a wet layup or vacume infusion for every single one.

#13

What Bricklin is talking about is Rotational molding but they have to use a special 2 directional rotational moding machine that also has a heating and cooling sections.

The fuel cells are molded with HDPE or you can use LDPE or other thermoformable plastics.

#14

So does every one think that I should just vac bag these? I was looking at making a few hundred.