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You now have a distinctive, focused new source of North American ground calcium carbonate products – INCOA Performance Minerals. Construction is underway on our new, state-of-the-art ground calcium carbonate (GCC) processing facility on the gulf coast near Mobile, Alabama USA. Our facility, expected to be producing by mid-2021, will manufacture fine particle sized GCC under the InCal® name, plus chemically modified fine and ultrafine grades to be sold under the InCal®T (treated) name. This product lineup includes fine-ground products with median particle sizes ranging from 3.5 microns to 11 microns and treated grades with median particle sizes from 0.7 microns to 3.5 microns.

INCOA is proud to offer a suite of fine, ultrafine and treated GCC products based on our remarkable, high-purity limestone. Our products have been carefully engineered, with you, the end user, in mind to provide outstanding performance. Our dry-ground, chemical free, patent-pending manufacturing process delivers:

  • Highly consistent quality
  • Steep particle size distributions
  • Low agglomeration
  • Unusually low, clean top particle size
  • Controlled, low level of ultrafine particles
  • High purity
  • High brightness

We have designed our products for use in several major markets, including:

  • Plastics
  • Sealants & Caulks
  • Adhesives
  • Film & Fiber
  • Rubber & Flexible Vinyl
  • Pipe & Fittings
  • Wire & Cable
  • Rigid Vinyl
  • Paints & Coating

We look forward to working with you on your ground calcium carbonate product needs!

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A calculated value that describes the breadth of the particle size distribution by looking at the size of the particle below which 90% of all particles are found (d90), the median and the size of the particle below which 10% of all particles are found (d10).

The Span is calculated from the following equation:

d90 = particle size below which 90 % of the particles are described
d10 = particle size below which 10% of the particles are described
d50 = particle size below which 50% of the particles are described, also known as the median

Broader distributions have a larger span while narrower distributions have a smaller span.

Level of Ultrafines

The percentage of the total distribution that includes particles that are 0.5 microns or smaller.

Some demanding applications require careful control of the level of very small particles. These particles can make the powder difficult to disperse and can actually absorb important components of formulations ultimately altering end-use performance.


The size below which 100% of the particles can be found.

Unlike most ground calcium carbonate suppliers, INCOA specifies at the 100% passing rather than the industry standards of 95% or 98% passing. We recognize that even very low levels of oversize particles can interfere with the performance of our products in your applications


The size below which 50% of the particles can be found.

This is the most common means of describing the size of ground calcium carbonate powders. INCOA describes our medians on the final product as-received by our customers. This means that the specification testing is performed on samples of the shipment before shipment on the final product not on material still in-process.