At EnviroTech Custom Injection Molders, we fully understand that for many of our clients, are processes are relatively complex and detailed. Whether for custom injection molding, product machining and finishing or any of our other specialty services, we strive to make the experience simple and understandable for our clients no matter what.

A big part of this in many cases: Speaking in terms you can understand, which often involves detailing what certain pieces of injection molding terminology mean and how they might impact your project costs or other details. To help our clients out in this area, this multi-part blog series will identify all the most common pieces of injection molding equipment or other important terms you’ll run into in this realm so your learning curve isn’t quite as steep.


First and foremost, you should be aware of the plastic resin, which is the raw material that will be used to create the part you desire during injection molding. Selection can be a detailed process here – there are numerous distinct resin types and styles depending on the sorts of products and qualities you’re looking for.

Choosing the ideal resin for your project is generally done in coordination with our professional custom injection molders, who have all the experience you need here. We’ll recommend the best resins based on your precise project specs, plus your stated budget, helping you decide on the perfect material for any manufacturing need, large or small.


Also necessary for any plastic injection molding project is the mold itself, which is a hollow form that allows the plastic to be injected into it to form into the desired shape. Injection molds are usually made from stainless steel or another metal type, allowing for either injection or another insertion method of the plastic that will begin the actual molding process.

Molds are one of the single largest investments in any custom injection molding process. It’s important that they’re made accurately, as any small imperfections will show up significantly in the final product that’s created.

Mold Cavity

A specific part of the injection mold that’s vital to be aware of is the mold cavity, or the hole in the mold that’s shaped to the desired part. Some molding projects will involve a single cavity, while others will involve multiple cavities used – this is known as a single mold versus a “family” mold setup. In family mold setups, great care must be taken to avoid any loss of quality in parts, though there are certain such cases where extreme quality is less of a priority.

For more on the terminology you should know when it comes to plastic injection molding, or for any of our custom molding or other services, speak to the staff at EnviroTech Custom Injection Molders today.