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carbon black replacement sustainable filler
Better Sustainability,
Better Results, and a
Better Bottom Line.

Improving Customers’ Formulas and Sustainability Since 1987

Austin Black 325 is a zero emissions filler that has been improving formulas with fewer CO2 emissions for more than 35 years. A dry, finely divided powder, it is manufactured by grinding high quality, sustainable bituminous coal. It is not burned, therefore it does not emit carbon dioxide. In comparison, every pound of carbon black that is produced emits an average of 2.4 pounds of CO2. Therefore, customers can achieve an immediate reduction in CO2 emissions by replacing a portion of the carbon black in existing formulas with Austin Black 325. Request a sample to try Austin Black 325 in your formula today.

In addition to directly impacting carbon reduction initiatives, Austin Black 325 can fill more molds with fewer pounds of material, improve air retention, and help resolve carbon black supply chain issues.

sustainable filler carbon black replacement

On average per year, our customers

reduce CO2 emissions
by up to 1.4 million pounds

based on an average annual purchase of 616,802 pounds.

Fill more molds with fewer pounds of material.

Thanks to its low specific gravity, Austin Black 325 can fill up to three times as much volumetric space as other mineral fillers, creating more finished product at a significantly lower per pound volume cost. 


As one of the most cost-effective pigments and mineral fillers available, it has a specific gravity of 1.30. When compared to the specific gravity of carbon blacks at 1.80, and other mineral fillers at 2.60 to 2.90, Austin Black 325 helps manufacturers lower compound costs, which ultimately leads to increased profitability. 

Improve air retention.

Austin Black 325 has been shown to improve air retention by 21.6% in tire inner liner applications.


Read the results of a recent study by ACE Laboratories that evaluated the performance of Austin Black 325 in a butyl inner liner application. The platy structure of Austin Black 325 helps create an air barrier within rubber compounds to reduce air permeation and improve air retention.

More Molds
Air Retention

Help resolve carbon black supply chain issues.

Austin Black 325 can be used as formula-improving carbon black extender to help alleviate supply issues.


Demand continues to increase for filler and extender products across industries like rubber reinforcement, paints and coatings, plastics, masterbatch, building products, and most notably the tire and automotive sector. With three US plants for processing and eight local sources for raw materials, you can rely on our tightly controlled operations for consistency in quality and delivery.

Talk to our team to learn about the benefits of using Austin Black 325 to replace a portion of the carbon black in your formula.

Supply Chain

We partner with manufacturing leaders in over 26 countries. We make global collaboration easy with translation services, strategic distributor relationships worldwide, and highly controlled operations to ensure on-time delivery. 

carbon black replacement

No greenhouse gases or waste is generated in our process. 

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