All You Need to Know About the Resin Selection Process

plastic molded parts

Before working with a plastic injection molding manufacturer, selecting the right injection molding resin is important – it allows your project to become successful. However, this isn’t easy because there are thousands of resins present in the market.

Here, we’re offering you some tips regarding the resin selection process. So, read on!

1. Choose a resin that can accommodate the stress of sonic welding or additional fastening, especially if your part requires inserts to fasten parts together or bosses molded-in for sonic welding.
2. List every criterion of the product requirements. For example, this may include flexibility, abrasion, temperature variations, etc. If you fail to mention something that the product needs, you’ll end up with a resin that won’t meet your customers' expectations.
3. Understand the combined product and the intention of every component. Here are some questions to ask: Do they need to be chemical or heat resistant? Do they need to be rigid or flexible? Are they holding a hot or cold liquid? Are they for high-impact solutions? Are they for abrasion resistance? By asking yourself these questions in advance, you’ll save a lot of development time.

4. The surface finish shouldn’t be left as an afterthought. The finish and texture may affect the choice of your material, the shrinkage, and the plastic resin flow through the mold. Decide beforehand what the finish needs to be. Talk to your mold designer if you’re not 100% sure. They can give you an informed opinion that may be flexible with their material of choice, allowing you to improve the choice during the later phases of the process.

Many resins will offer a visually appealing, durable texture and finish. Texture has its own benefits; for example, it can allow gases to escape the mold during the injection process, improve paint adhesion, improve grip if your product requires it, and can be used to hide parting lines and make undercuts. To allow for proper design in the mold, the surface finish should be decided beforehand when selecting your resin

Get high-quality products with PTMS’ injection molding services

Since 2002, PTMS has been working in injection mold design. With more than 15 years of experience and 80% of employees having worked in multinational corporations, PTMS is the leading injection mold manufacturer in China you should trust.

Get in touch with us for more information on our injection mold design!


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