A forum with a wide range of engineering-related topics
How It's Made: Plastic Injection Molds
From the popular "How It's Made" series on the Discovery Channel
DME collapsible core
Animation demonstrating an automated mold component that forms threads or an undercut in a cap shape
Material Selection for Plastics and Rubber (.pdf)
Things to think about, some perhaps surprising, when choosing a material. Includes checklist.
Thermoplastic versus Thermoset
What the terms mean.
GE Plastics Injection Molding Design Guidelines
Rubber part design
RMA Molded Rubber Tolerance Chart (.pdf)
INDIANA Rubber & Plastics Company, Inc.
CUSTOM MOLDED PLASTICS/RUBBER