While injection molding is highly amazing with a vast variety of possibilities, there are several typical flaws in components that are manufactured using this method. They have to be taken into account throughout the design phase since a lot of them might be reduced or avoided by using the right geometry and features. The most typical injection molding flaws are listed below. The design may have an impact on the flaws discussed below, but there are other potential causes as well.


A portion might have a blister that looks like a bubble or a raised region with distinct layers. Blisters develop during the injection molding process as a consequence of excessive or uneven heating. Malfunctions in the molding process and mold design both have the potential to produce excessive heat. Blisters in the components are a possibility if there aren’t enough cooling features.


Jetting may give the portion a wavy and irregular design. With jetting, mold design may have a direct role. The cause of jetting is inefficient and inconsistent material flow. The characteristics of the mold or the injection parameters may be to blame for this.

Quick Shot

Typically, a short shot is made when an unfinished component is created. The component might have a gap or be missing a whole segment. In either case, there isn’t enough material in the portion. This is typically brought on by trapped gases in the mold, such as air. This may usually be prevented by integrating enough ventilation in the design.


Flash is a small layer of additional material that protrudes beyond the part’s geometry. The more the molds are used and worn, the more often this happens. However, it may also be caused by poor closure of the mold in terms of pressure or alignment.


Short shots and voids in injection molded objects have certain similarities, albeit the fault may not be as visible at first glance. The fact that both of these flaws may be brought on by the presence of trapped gas in the mold is one of their fundamental commonalities.

Glue Lines

An unanticipated location where the material met is known as a weld line. When more than one injection is utilized in the mold, the flow becomes inadequate, which results in this. Molds with a single injection site are unaffected by weld lines. There are alternative methods to avoid weld lines, however, if your design calls for several injections.


Parts that have warped might become bent or misshapen. This also has to do with the heat. Warping may be greatly reduced by designing a mold with homogeneous wall thickness and suitable cooling elements.

Find the best injection moulding company to work with and choose them for the process of molding if you want to prevent this problem. It is your responsibility to do so.