Omya calcium carbonates are used in rotomolding to produce industrial articles, containers, and technical parts and offer substantial performance and cost benefits.

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Excellent masterbatch quality

Omya solutions provide excellent masterbatch quality thanks to their high-quality pulverized micropellet content.


This key part of the rotomolding process is successfully achieved through the treatment technology we use on the mineral additive, which provides superior dispersion of calcium carbonates within the polymer matrix.


In the final MDPE (Medium Density PolyEthylene) roto articles, typical calcium carbonate levels range from 5% up to 30%, depending on the final product.

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Reduce rotomolding cycle times

The addition of Omya calcium carbonate reduces the overall cycle time of the rotomolding process by shortening the cooling time.


This happens because calcium carbonate has a 6 times higher thermal conductivity than MDPE. For every percent of mineral added, the overall cycle time can be reduced by approximately one percent.

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Enhance product properties and performance

Omya’s fillers improve stiffness and environmental stress cracking resistance (ESCR) which allows the reduction of wall thickness of the end articles and saves material costs.


Omya solutions for rotomolding enhance the isotropic shrinkage, reduce the warpage and increase the dimensional stability of parts.


Replacing polymer resins with calcium carbonate for rotomolding allows for substantial material cost benefits in addition to significant carbon footprint benefits.

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  • Cost reduction
  • Reduced carbon footprint
  • Reduced cycle time
  • Increased stiffness and environmental stress cracking resistance (ESCR)

Talk to an Expert

If you would like some advice about how Omya’s calcium carbonate can support you in masterbatch production, you can speak to our expert team.

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