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 freemansupply.com (our primary website for professionals) or 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 www.FreemanVideos.com. Or check out our KZbin 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 ...
2 - Making Flexible Molds with Urethane Rubber
• Making Flexible Molds ...
3 - Simple Silicone Rubber Molds (Without a Parting Line)
• Simple Silicone Rubber...
4 - Two-Part Silicone Rubber Molds (Forming a Straight Parting Line)
• Two-Part Silicone Rubb...
5 - Moldmaking With Clear Silicone Rubber
• Moldmaking With Clear ...
6 - Making Molds & Casting Thin Walled Parts (& Using Color Tints)
• Making Molds & Casting...
7 - Making Two-Part Silicone Rubber Molds with Complex Parting Lines
tinyurl.com/spf9z8hs
8 - Tips & Tricks for Moldmaking & Casting Parts with Intricate Detail
• Tips & Tricks for Mold...
9 - Making Simple Multi-Cavity Molds
• Making Simple Multi-Ca...
10 - Surface Casting Method #1 (featuring Gap Wax)
• Surface Casting Method...
11 - Surface Casting Method #2 (With Brushable Urethane Casting Resin)
• Surface Casting Method...
12 - Using Fillers & Pourable Foam to Lighten a Casting (& More)
tinyurl.com/2cav5em5
Laminate Toolmaking & Composite Parts Videos:
1 - Laminating with Fiberglass & Epoxy - The Basics
• Laminating with Fiberg...
2 - Building a Fiberglass & Epoxy Laminate Mold
• Building a Fiberglass ...
3 - Vacuum Bagging a Carbon Fiber/Composite Part
tinyurl.com/auf6d2d8
4 - Building a Laminate Tool with Epoxy Paste
• Building a Laminate To...
5 - Rapid Tool Making with the Repro Laminating System
• Rapid Tool Making with...
6 - Making a Simple Glove Mold
• Making a Simple Glove ...
Preparing Models, Molds, & Materials Videos:
1 - Prevent Your Castings & Models From Sticking to Your Molds
• Prevent Your Castings ...
2 - Weighing & Mixing Resins & Silicone Rubber The Right Way
• Weighing & Mixing Resi...
3 - Eliminate Entrapped Air in Molds & Castings
• Eliminate Entrapped Ai...
4 - How NOT to Ruin Silicone Rubber When Making Molds
tinyurl.com/32uwjv3z