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Designing for Plastic Longevity

You should always consider what a part goes through on a daily basis. It’s imperative to consider the level of stress or load that a part will be subject to and secondly the length of time that the injection moulding part will exercise stress, load and other pressures. If a plastic part is continually loaded or placed under pressure the structure of the part will change over time and this is referred to as creep. Other factors affecting an injection moulding parts’ longevity include wear and fatigue.




Creep is when a plastic part is stressed over a period of time and will not return to its original state, it can lead to extreme deformation or breakage of the injection moulding part. When designing parts that will be subject to long-term loading, using creep data can be effective to ensure that the parts do not rupture, yield, or deform excessively over their required service life.




Wear refers to the gradual erosion of the injection moulding material which has been subject to friction over a period of time. Friction usually occurs at the point of contact between two or more materials, often seen on components with bearings or gears. Erosion is typically present when surfaces with varying coarseness are in contact and therefore cause wear.




Fatigue occurs when a repeated strain or stress causes the failure of a plastic component. The load or level of stress does not have to be high in this instance but it is the amount of time the component is subject to the stress that causes the failure. Injection moulding parts most at risk of fatigue include, those subject to vibration or repeated impacts or flexion.


Speak to a member of our design team today, for help and advice when designing for injection moulding part longevity.



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Looking for more information? Check out our blog, News & Views for useful articles, tips and tricks on plastic injection moulding.