Making Two-Part Silicone Rubber Molds with Complex Parting Lines

Sometimes making a straight parting line (or even a simple curved one) isn't practical. Therefore, one must be creative when forming the two halves of a silicone rubber mold. This process shows one method for creating complex parting lines.
00:00 - Introduction
00:56 - Modeling Clay (Sulphur-Free)
01:43 - First Half of Mold
02:24 - Second Half of Mold
02:50 - Installing Our Gate & Venting System
03:34 - Demolding
03:51 - Casting Resin
04:17 - Cutting & Drilling Additional Venting
This is an updated version of the video originally entitled Silicone Rubber Molds with Complex Parting Lines. We’ve gone back to increase the resolution, correct the color; plus update the graphics and add some clarifying content.
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).
Finally, this video was originally part of a compilation DVD entitled Making Parts, Patterns, Tools, & Molds. You can see all of those videos (in sequence and in context) on our dedicated video website at www.FreemanVideos.com. Or check out our CZcams 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

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This is the 8th in a 12-part series on mold making and casting. See description for more details.