Welcome to Imerys Performance Minerals

Deposit Control

Deposit control Imerys talcs and bentonites for effective deposit control throughout the papermaking process

Imerys highly lamellar minerals are effective, natural solutions for total deposit control throughout the papermaking process.


Talc has a high specific area and low surface energy which shows an affinity for organic substances such as wood pitch and stickies. Pitch and stickies, such as wood resins, adhesives, inks and waxes, also have a low surface energy. As low-surface energy substances naturally attract each other, talc attracts pitch and stickies onto its platelets, rendering them harmless and preventing them from agglomerating

Our Mistron® talc grade uses two mechanisms to combat deposits, depending on the size of the contaminant. 

Small particles, such as micro stickies or pitch, are absorbed onto the organophilic surfaces of the particle.
Larger particles, such as macro stickles or agglomerated pitch are envelopped by particles.

Pitch and stickies are pacified at three levels during the papermaking process:

  • Talc is hydrophobic and remains on the surface: the talc-enveloped contaminants can therefore be evacuated during the flotation process
  • During cleaning, talc envelops stickies, increasing their density and making them easier to remove
  • Any remaining contaminants leave the process in the finished paper

Our Mistron® range is particularly effective for combating pitch and stickies in virgin and de-inked (DIP) pulp and paper production


Due to its high active surface area, Bentonite is capable of absorbing all kinds of hydrophobic particles during paper production, including both colloidal and micro particles.  

Bentonite, such as our Altonit® range is particularly effective for absorbing stickies in de-inked (DIP) and recycled base paper and board production

In both cases, our Total Deposit Control (TDC) solutions neutralize the tacky nature of the contaminants, eliminating felt and wire blocking problems as well as deposits on pressing and drying cylinders. The runnability of the paper machine and the quality of the final paper product is improved significantly.

Our Total Deposit Control solutions are effective in both chemical and mechanical virgin pulp as well as deinked and recycled pulp. They are ideal for newsprint, SC and LWC paper, wood-free printing grades, tissue paper and board.

Our cationic Mistron® grades significantly reduce anionic charge in the system helping to reduce use of more expensive and less environmentally friendly cationic polymers. They are particularly effective in recycled pulps containing high levels of anionic trash.


We offer a full range technical and process support services to help you match the right mineral grade to your application requirement.

Please contact us, we will be only too happy to help

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Paper & Board