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When it comes to manufacturing large hollow plastic parts, nothing beats the process of rotomolding. Compared to other molding or casting processes like injection or blow molding, rotomolding is exceptionally cost efficient and the products produced are also of better quality.
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Mold Release Agents

Mold Release AgentsPlastic mold release agent is a chemical substance used to get a slip effect so that the finished plastic products can be efficiently removed from the molds without effecting the perfection of the molded surface. Good mold release agents maximize the process efficiency by reducing cycle time and eliminate the need for a bake cycle. Ideally these releasing agents should be such that they do not alter the finish of the molded products and also not interfere with auxiliary processing requirements. Another important requirement of such mold releasing agent is that they should prevent the pigments from streaking, accumulating, or swirling due to the static electricity that develops as a result of the rotational molding cycle. Textured surfaces and tight tolerances necessitate extra demands on the performance of these release agents.

Types of Mold release Agents

There are a wide variety of mold release types available commercially. Most of these can be categorized into two three main types :
  • Sacrificial coatings
  • Semi-permanent coatings
  • Permanent coatings
Sacrificial Coatings

These coatings has to be applied every time a new molded part is being manufactured as most of the mold release agent material comes off as the mold is released from the tool. A typical sacrificial coating MRA is Silicone.

Semi-Permanent Coatings

Mold Release Agents
This is the most used type of MRA in rotomolding. Normally, these coatings last for quite a number of releases provided they are applied correctly. These coatings are generally made up of a synthetic chemical called polysiloxane.

Permanent Coating

These are certain type of Teflon coatings that has to be applied only once. These type of MRA coatings are very susceptible to damage when misused.

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