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This Instructable is an introduction to the basics of mold making for people interested in mold making with little to no knowledge on the subject.

It will walk you through some important vocabulary, break down the major mold types and help you select the correct mold for your project.

Here are some great mold making resources:

http://www.smooth-on.com/

Tap Plastics

http://www.aeromarineproducts.com/silicone-mold-making

Step 1: Types of molds

There are a variety of mold types for different applications:

  • Pour mold - Mold made by pour silicone over an original inside of a containing box
  • 1-part pour mold (block mold) - a pour mold with only one side (simplest type of mold)
  • 2-part pour mold - a pour mold with two or more halves and registration keys to align the parts
  • Brush-on mold - a mold made by brushing on thin layers of silicone to build up a skin that is then encased in a rigid mother mold to give structure while casting
  • Glove mold - A brush-on mold that does not require a parting line (sometimes uses a small slit)
  • 2-part brush-on mold - A brush-on mold that is split into two or more parts
  • Lifecasting - Mold made of a living human

Diagrams of the cross section of several mold types

Here is more information on Mold types.

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<p>cool</p>
Thank you so much for this ible! I have so many interests, and today I was looking for information about making soap molds. Then I came across this - the holy grail of mold making!!!!! This one ible answers all my questions about anything and everything I might want to make a mold of / for. I noticed that you haven't made any ibles in a while, please come back, we need you!!!!!!!!!!<br>Very Sincerely,<br>Rose
<p>Really helpful instructable and good questions to help one determine type of mold. I'm a soap maker who would like to replicate a silicone liner used in a wooden box soap mold (4 lb. capacity) that I purchased some years ago. The makers went out of business or I would just order from them. Notice in picture the mold has score lines for perfect bars of soap...Shall I just walk it to my local TAP Plastic store and ask them where to begin? Thank you!</p>
<p>Hi I'm trying to find the list and prices for PMC121-30. I was there once and lost it.It had qt.,gal.,5 gal. and black rubber dust extender. If I can get there again,I'm ready to order.PLEASE help me. thank you</p><p>bob111934@you.com</p>
<p>Hi I'm trying to find the list and prices for PMC121-30. I was there once and lost it.It had qt.,gal.,5 gal. and black rubber dust extender. If I can get there again,I'm ready to order.PLEASE help me. thank you</p><p>bob111934@you.com</p>
<p>Hi I'm trying to find the list and prices for PMC121-30. I was there once and lost it.It had qt.,gal.,5 gal. and black rubber dust extender. If I can get there again,I'm ready to order.PLEASE help me. thank you</p><p>bob111934@you.com</p>
May I have your mail so I could ask you things about molding?
<p>Post any questions about molding here incase someone else has the same question!</p>
<p>The part I want to reproduce is a hard nylon think I can make the mold. What material could I use to have a hardness like Black Nylon</p>
<p>Smooth-On's Onyx resin is a good choice. (And it's black too!)</p>
<p>Afaik, nylon is melted, not two part cast.</p>
<p>There are lots of options when it comes to selecting a material to cast in. I haven't come across any nylon casting materials (though I'm sure they exist). Smoothon.com has a lot of different options, plastics, foams, rubbers, etc. I usually use Smoothcast 300. It is a very strong plastic, however it's a bit brittle so I wouldn't use it for anything that will take impact. Maybe start by looking at the different polyurethane plastics at smoothon. Let me know if you find an interesting material!</p>
<p>In fact, a lifecast mold is not really a separate category; they can be simple, complex, poured, painted-on, etc. Big difference is there's a person in there!</p>
<p>New to molding/casting and was wondering if I could get your input. I want to replicate a picture frame I have. What type of mold would you suggest? Thanks!</p>
<p>Since there are only features on one side, and the other is flat I would use a one part pour mold as described in the instructable</p>
<p>Everything I saw was links to other instructables. Do you not show and tell how to make molds? I could have searched other instructables without reading this.</p>
<p>This instructable is a broad overview and introduction to the world of mold making. It teaches you the basic vocabulary and reasoning behind choosing a mold. It would be difficult to fit all the types of molds into one Instructable so instead I included links to each kind of mold. If you're interested in how to make a specific type of mold reference the links provided for each kind.</p>
<p>Thanks for the Instructable. I've been planning on doing a mold and cast of my friend Yorik. It looks like a two part brush on mold would be the best for him.<br></p>
<p>haha...from the thumbnail on the instructible email, i thought that was a urinal. i was thinking, &quot;oh wow, how handy!!&quot; :) (they cut off the top of the helmet)</p>
<p>here is the part photo</p>
wow! that's some detail. you've made it exciting enough for newbies to try their hand at some molding. thanks for this.
<p>No problem! give it a try it's a lot of fun!</p>
<p>Fantastic instructable thanks so much for posting!</p>

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Bio: Hey there! I'm recent graduate of Carnegie Mellon University's Industrial Design program and a former Instructables intern. When I'm not working in ... More »
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