Last month’s design tips discussed how draft angles are specific to each part that is built.  This month we will look at some standard injection mold resins and some of the properties that they possess.

When deciding which molding resin to use, one must consider the mechanical properties, molding properties, and cost of the resin selected for the given application.  Application-specific requirements will always drive the need for particular material properties, like tensile strength and elasticity.  Successful plastic part design is based on an understanding of processing related issues during manufacturing, such as mold filling, likelihood of flash, part ejection and the potential for warp and sink.  The table below lists some commonly used resins, along with brand names, and a high-level summary of their material properties and moldability characteristics.

Standard Injection Molding Resins

Please keep in mind that this is a concentrated view of how to select the right resin for your plastic part.  All major material representatives have application specialists that can help you with your selection.  We strongly urge you to discuss your project with one of these specialists prior to making your mold.

We hope this gives you some ideas for your next molding project.  If you have any questions regarding this or any other injection molding information, please send us an email or give us a call at (770) 901-3200.