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Blow molded cases are ideal in situations where a custom product design is necessary because the process of designing the custom molds is not extensive. At the same time, blow plastic molding creates strong yet lightweight cases that can be used in a variety of situations. Blow molded cases can be manufactured in high or low volumes, and there is a great deal of flexibility associated with designing them.

Injection Molded Cases: How they are made and Basic Characteristics

With injection molding, thermoplastics are heated up in a barrel then forced into the cavity of a specially-designed mold. Upon cooling and hardening, a strong plastic piece is created. For this reason, low volumes of injection plastic molds are impractical.

The Advantages and Disadvantages of Injection Molded Cases
Injection molding is ideal for designing and manufacturing a large quantity of standard cases. There are many standard sizes when it comes to shipping cases, carrying cases and other products, so injection molding is frequently used in such applications. Generally, injection molded cases are still strong, resilient and versatile.