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The Work Item below is a Proposal for a New Standard with development in progress. A first ballot to review the proposed draft will be opened within the next weeks.

Subject Category: 0114 Fillers and Pigment
WGC: Martti Tuomisto

Title: High Shear Capillary Viscosity (ACA Capillary Viscosity) of coating color on paper and paperboard


1. This method describes a procedure for measuring high shear viscosity of pigment coating colors using an ACA AX-100 Viscometer with a capillary configuration.
2. In this method, high shear viscosity is determined as mPa·s at the shear rate of 500,000 s-1, and simply called ACA Capillary Viscosity.
3. The method is applicable for water-based pigment coating colors used in various coating processes such as in blade, rod, and film transfer coating. Typically, suitable pigment coating colors have a solids content between 30 % and 80 %, and they contain mineral pigments, synthetic and / or natural binders and coating additives.

If you wish to join the correspondent SSIG to review this new proposal, please write to by September 30, 2020. 

TAPPI Standards guidelines require that all TAPPI members receive notification of any proposed new Standard or TIPs. This message is being sent to you because you are a TAPPI member; have purchased TIPs or Standards products from TAPPI; or because you have previously expressed interest in this topic.


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