High volumes of our calcium oxide desiccants Innovox® can be used to successfully eliminate porosity – but this may lead to detrimental effects on finished rubber products, including reduced vulcanisation or increased compression set.

That’s why we’ve developed Birchset® CR, a food contact approved cure stabiliser and compression set reduction additive. Birchset® CR eliminates increased compression set or reduced vulcanisation – without compromising rubber compound performance.

Birchset® CR is an activated polymer, giving it excellent mixing and dispersion characteristics which make it easy to use. Birchset® CR should always be used in combination with Innovox®.

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Packed In
15kg and 20kg sacks
Used with Innovox in EDPM Rubber
Made In
United Kingdom

  • High humidity regions or rainy season
  • High moisture EPDM compounding
  • Highly filled EPDM
  • Works alongside Innovox
  • EDPM door seals
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  • High humidity regions or rainy season
  • High moisture EPDM compounding
  • Highly filled EPDM
  • Works alongside Innovox
  • EDPM door seals

The Innovox® difference

The Innovox® range has been fully tested and qualified by leading Artis and Ace Laboratories and proven to prevent visible extrusion breakout and surface defects, reducing specks, lumps and streaking in production caused by unwanted moisture in the finished product. Compare the difference by using the slider below.

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Dispersion within rubber with or without Innovox®
Without Innovox® (left), Creates damaging bubbles within the compound.
With Innovox® (right), No bubble or moisture damage.

Substantial UK stock levels

We always carry substantial levels of stock in the UK, so are able to service your needs quickly and efficiently. International customers are serviced by our distribution partners across the globe.

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Industry-leading solutions

Birch Chemicals provides industry-leading high quality products based on decades of expertise and developed from an ethos of constant innovation.

Helpful FAQs

Frequently Asked Questions


There are no problems with using Birchset in combination with other additives. If you would like advice on this, please contact us.

Birchset can be used with any calcium oxide desiccant and has been specially formulated to work with Innovox. If you would like advice on product choice please contact us.

Yes, Birchset is used by many other compounders worldwide. Ask us for details of reference customers.

We have conducted extensive testing on Birchset with external laboratories (such as Artis and ACE Consultants) and can provide test reports on request. We can also provide reference customer details within your own field of application. Ask to see our test reports or contact us for advice.

Birchset suppresses the competitive reaction between calcium and zinc ions in the cure system and facilitates maximum cross link density. If you would like to find out more about how Birchset works, please feel free to contact us.

No. Birchset is an activated polymer which can be used in combination with any calcium oxide desiccant, but it has no desiccant properties itself.

Birchset is almost exclusively used in sulphur cured EPDM systems. Please contact us for recommendations regarding your proposed use.

Addition level will depend on the calcium oxide levels within your compound. In practice, the typical dose rate for Birchset would be around 0.5 to 2 phr (or around 20% of the calcium oxide phr). If you would like advice on addition levels, please contact us.

Birchset is usually supplied in 20kg weight defined boxes for scoop addition to the compound mix. Ask your distributor for further details or please contact us.

Typically, Birchset is added with calcium oxide at the start of the mixing process. If you would like advice on addition points, please contact us.


Our customers say it best...

  • "In the past we have had a lack of consistency with product quality and have been let down with deliveries affecting our production schedule. This is a thing of the past with Birch Chemicals. They offer flexibility and adapt to our needs to deliver an outstanding service as well as a product that is competitively priced with consistency in product quality. Their responsiveness to our operation is why we use Birch Chemicals!"

    Jake Goodwin at IPL

  • "Awesome caring company. They present the true definition of sustainability in all their endeavours."

    Richard Dee

  • "It is a pleasure to work alongside our key supplier Birch Chemicals. Their market leading expertise in the rubber industry help us to serve our valued customers to the best of our ability."

    Gokhan San at Univar Solutions


Global product, worldwide support

We work with our specialist distribution partners to offer unparalleled service and supply globally, whatever your requirement. If you want to talk rubber or plastics, coatings or adhesives just get in touch. Our distributors can speak your language - literally.

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