INCOA Performance Minerals supplies fine, ultrafine and treated ground calcium carbonate for North American markets. Our high-quality ground calcium carbonate can be used as a functional filler in a variety of end-products including film, fiber, pipe, conduit, vinyl profile used in construction, paint, sealant, caulk, adhesive, and rubber. 

We offer a unique and highly pure starting mineral that provides customers with a new option for all their ground calcium carbonate needs.


Our team understands the importance of quality. That’s why we’ve engineered our products and developed processes with quality at the heart of  everything we do.

The exceptional purity of the high-brightness limestone we use provides a unique starting material  for our InCal products. In addition,  our patent-pending process does not include the use of processing chemicals that  can interfere with application performance. The resulting products are characterized by:

  • Low levels of acid insoluble minerals
  • High purity
  • Steep particle size distributions
  • Low levels of oversize particles and agglomerates
  • Low levels of ultrafine particles


Our product offering and  internal processes put customer needs front and center. By focusing on these needs, we strive to design products fit-for-use based on customer needs.


We are an industrial minerals manufacturing and logistics company with a full suite of fine, ultrafine and treated ground calcium carbonates.  We leverage our years of experience to provide consistently high-quality products and services.  With a depth of experience in mining, international operations, research, product development, engineering, industrial processing, logistics, quality management, customer service, sales, and marketing, we are well-suited to deliver outstanding products to your plant.


Our exceptionally pure limestone is just the first step in the manufacture of our innovative products. Our patent-pending processing coupled with our laser-like focus on quality and our understanding of major technical and logistical drivers allow us to create a Best-in-Class experience for our customers.


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.