Specialist desiccants and additives used in a wide range of applications

Masterox® Calcium Oxides

Masterox calcium oxides are powerful desiccants that can alleviate problems such as extrusion blow out or surface defects, which can develop during the processing of thermoplastic compounds.  These problems arise due to the presence of moisture.

Moisture can be present in raw materials e.g. polymers (especially hydroscopic types such as ABS, polyamides etc.), fillers and plasticisers. As little as 0.02% moisture can cause extrusion blow out or surface defects in the end product if it is allowed to expand freely into water vapour at polymer processing temperatures. The addition of Masterox is the most efficient and cost effective solution to eliminate these problems.

Masterox microfine powders disperse easily and evenly throughout the product mix to give consistent results.  Addition rates depend on which application it is used in, formulation and local conditions.

Birch Chemicals is unique in that we have an integrated supply chain which gives Masterox products unrivalled performance due to their consistency, control and traceability.

For further information on the advantages of using Masterox please download the product information leaflet. (link to leaflet download) (insert leaflet image)

Mode of action

Calcium oxide reacts exothermically with water, generating heat and converting to calcium hydroxide. The calcium hydroxide formed acts as an inert filler in the end product. Innovox high activity calcium oxide will chemically bind up to 32% of its own weight in moisture.

The decomposition temperature of calcium hydroxide is approximately 530°C, well above the typical processing and service temperatures of plastics.

Available locally from our network of global distributors, see (link to distributors page)

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Safety data sheet

Masterox 10

Safety data sheet

Packaging Options

Innovoh calcium hydroxide grades are available in 12.5kg poly-lined bags and pre-weighed sachets or pails. Low-melting point sachets are available for direct addition to compounding equipment. Customer-specified options (sachet type/printing/labelling etc.) can be accommodated in many cases.

Bespoke customer specified options are available. Please contact us to discuss.