I can't find the answer by googling it. wikipedia just says various types of foam.
WIKIPEDIA is a better resource for a question like this than any.
S. Casale wrote: WIKIPEDIA is a better resource for a question like this than any.
S. Casale wrote:
Better than the SW Forums
I am by no means the person to be answering your question about the mold material or fiberglass. But, you may get better results if you can give a more thorough description of what you are trying to make and how many copies. I think this is probably for the mailbox for your class, correct? Was your assignment to choose something that is to have a production run of 1000 units, or are you just making one copy? Was the process to be automated, or manual (like I said I don't know much about fiberglass, but I'm sure some of that industry has been automated). Any other assignment specific information you provide will get you better answers from someone with more experience.
A well phrased question will generate a set of good answers/suggestions. Eric, you have to be honest that your question, though it might be perfectly clear in your mind, lacks context and supporting information necessary for us to really help you, as Matt is trying to explain.
I guess you're asking about injection molding tool?
if yes, then it can be steel or aluminum depending on number of shots
There would be some questions based on the product or do you want a negative or positive part, what is the fiberglass process, blown or hand layups, will you be producing a sample part that can be used to build your mold.
To answer your question I would use Fiberglass Cloth Layup for my mold and make a negative mold, if it's still your mailbox project, because of the process involved. You would need to spray the interior portion of the mold with a mold release and then spray a gel coat (if you want it looking nice), then you need to use a fine ground cloth material, which creates a hook & eye connection between the gel coat and the fiberglass layup.
I would build a sample pc out of either a build up of fiberglass and body filler or an aluminum sample, sanded smooth and then wet sanded with 2,000 grit, spray on a high build primer and sand between coats, then wet sand again, then spray a high gloss automotive paint (Half & Half clear coat), let it dry wet sand and add another clear coat, then wet sand and buff with a car buffer, till it shines like a mirror. Only now are your ready to produce your mold, by spraying the sample pc with a mold release and follow the instructions above.
I need to dig through my archives for a project that I was responsible for, I have a complete step by step process of how to do Fiberglass Hand Layups...
I have made the same as John's suggestion.
I don't use WIKIPEDIA; anyone can write/change it.
Check out YouTube also, some interesting videos there.
Go with some hardened S-7. It is tough and will be able to produce millions of your mailboxes. Go big or go home!
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