Roto-Molded vs. Injection Molded Cases: Which Is Best For You?

psi cases roto-molded vs injection molded cases

Learn about the differences between roto-molded and injection molded cases.

When you are ready to design your custom case with Packaging Strategies, Inc., you will likely have to ask yourself one question: injection molded or roto-molded? These two methods for building custom cases offer two methods for constructing a sturdy and long-lasting case that protects your valuable equipment. The cases primarily differ in the way they are built, as well as their weight. Deciding which case is better suited for your needs may require you to think carefully about what will go into the case and your primary design needs. Fortunately, Packaging Strategies Inc. can help you make this crucial decision.

Injection Molded Cases: Reliable Strength, Less Weight

Injection molded cases use a standard mold for each particular case size. The plastic used in these cases is often a combination of different polymers, which creates a stronger yet lighter case. 

An injection molded case often has very even corners and single watertight walls. Most models come with plastic catches, air valves, and gaskets. Using single walls rather than double walls contributes to the lightweight nature of injection molded cases. 

Roto-Molded Cases: Extra Toughness When Needed

Roto-molded cases are always heavier than their injection-molded counterparts. One primary reason for this is that rotationally molded cases have double walls in the corners. This is where you add extra strength, especially to protect loaded cases from drop impacts. 

Case molds are placed on a large machine that rotates on the vertical and horizontal axes. Heat, speed, and cooling are the key factors that determine the final design of each case. Roto-molded cases are often custom-made to the customer’s required features, which means a slightly longer construction time. 

Which Case Should You Use? 

For most common applications, injection molded cases will handle the job well. However, if you need a larger case or additional strength only found in roto-molded cases, that may be the better solution. 

When Should You Opt for More Protection from Roto-Molded Cases? 

It’s better to be safe than sorry when protecting your valuable equipment. When should you decide to add more protection and use a roto-molded case design? 

  • When exceptional strength and durability are required
  • The cases must withstand high impacts and rough handling 
  • When you need to transport equipment that is large and uniquely shaped 
  • When in need of exceptionally waterproof and airtight cases
  • When thermal or sound insulation properties are required 

Packaging Strategies Inc. can design cases for your company and its unique equipment protection and travel needs. Contact us today to discover whether injection molded cases or roto-molded case designs are ideal for your next transit case. 


Packaging Strategies has assembled a team with over 100 years of experience in design, engineering, development, manufacturing, and sales. We created the Packaging Strategies Design and Technology Center to create and manufacture complete systems integration packages and container solutions of all sizes and materials for our clientele. Many of these clients are federal agencies or in the private sector. No matter what you need to carry, Packaging Strategies is sure to have the right case for the job. You can view our website here, and follow us on Facebook, Twitter, Flickr, and LinkedIn.

This entry was posted on Tuesday, May 21st, 2024 at 9:26 am. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.