How NOT to Ruin Silicone Rubber When Making Molds

We decided to ruin some mold making materials so you won't have to. Here, we demonstrate and explain cure inhibition of silicone rubber.

00:00 - Introduction
00:55 - Two Silicone Rubber Chemistries
01:08 - Condensation Cure Silicone Rubber
02:14 - Addition Cure Silicone Rubber
02:34 - Sulphuric v Non-Sulphur Clay Demonstration
03:49 - Urethane Foam Experiment
04:49 - Urethane Rubber Comparison
05:16 - Summary of Moldmaking Materials Pro v Con

Freeman Mfg & Supply is a materials supplier. The thousands of hours dedicated to producing this series was done in service to our industry. If you are looking for any of the materials shown, please visit us at http://freemansupply.com (our primary website for professionals) or http://miapoxy.com (curated for the DIY market).

You can see all of our videos (in sequence and in context) on our dedicated video website at https://www.FreemanVideos.com. Or check out our YouTube Playlists. Or find your next video of interest here:

Moldmaking & Casting Videos:

1 - Using Rigid Fast-Cast Urethanes for Casting Both Molds & Parts
   • Using Rigid Fast-Cast Urethanes for C...  
2 - Making Flexible Molds with Urethane Rubber
   • Making Flexible Molds with Urethane R...  
3 - Simple Silicone Rubber Molds (Without a Parting Line)
   • Simple Silicone Rubber Molds (Without...  
4 - Two-Part Silicone Rubber Molds (Forming a Straight Parting Line)
   • Two-Part Silicone Rubber Molds (Formi...  
5 - Moldmaking With Clear Silicone Rubber
   • Moldmaking With Clear Silicone Rubber  
6 - Making Molds & Casting Thin Walled Parts (& Using Color Tints)
   • Making Molds & Casting Thin Walled Pa...  
7 - Making Two-Part Silicone Rubber Molds with Complex Parting Lines
https://tinyurl.com/spf9z8hs
8 - Tips & Tricks for Moldmaking & Casting Parts with Intricate Detail
   • Tips & Tricks for Moldmaking & Castin...  
9 - Making Simple Multi-Cavity Molds
   • Making Simple Multi-Cavity Molds  
10 - Surface Casting Method #1 (featuring Gap Wax)
   • Surface Casting Method #1 (featuring ...  
11 - Surface Casting Method #2 (With Brushable Urethane Casting Resin)
   • Surface Casting Method #2 (With Brush...  
12 - Using Fillers & Pourable Foam to Lighten a Casting (& More)
https://tinyurl.com/2cav5em5


Laminate Toolmaking & Composite Parts Videos:

1 - Laminating with Fiberglass & Epoxy - The Basics
   • Laminating with Fiberglass & Epoxy - ...  
2 - Building a Fiberglass & Epoxy Laminate Mold
   • Building a Fiberglass & Epoxy Laminat...  
3 - Vacuum Bagging a Carbon Fiber/Composite Part
https://tinyurl.com/auf6d2d8
4 - Building a Laminate Tool with Epoxy Paste
   • Building a Laminate Tool with Epoxy P...  
5 - Rapid Tool Making with the Repro Laminating System
   • Rapid Tool Making with the Repro Lami...  
6 - Making a Simple Glove Mold
   • Making a Simple Glove Mold  

Preparing Models, Molds, & Materials Videos:

1 - Prevent Your Castings & Models From Sticking to Your Molds
   • Prevent Your Castings & Models From S...  
2 - Weighing & Mixing Resins & Silicone Rubber The Right Way
   • Weighing & Mixing Resins & Silicone R...  
3 - Eliminate Entrapped Air in Molds & Castings
   • Eliminate Entrapped Air in Molds & Ca...  
4 - How NOT to Ruin Silicone Rubber When Making Molds
https://tinyurl.com/32uwjv3z