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Solving Moisture Problems in Powders

Date: December 10, 2014
Time: 8:00 AM PDT | 11:00 AM EDT
Duration: 60-minutes

Sponsored By:

About the webinar

If you use or manufacture powder materials, you probably expend significant effort in maintaining their stability and eliminating the effects of degradative reactions (reduced flow, sticking, compaction, crystallization).

Strategies such as adding anti-caking agents, processing under controlled humidity and temperatures, packaging with moisture-resistant materials, and agglomeration are often used to mitigate these issues.

But while it is generally understood that moisture plays an important role in determining powder stability, many lack the tools to identify optimal moisture specifications and understand the detailed effects of moisture on a particular product.

Water activity (the intensive variable associated with moisture content) has proven to be valuable metric for understanding moisture’s influence on powder stability. Moisture sorption isotherms (the graphed relationship between moisture uptake and water activity) can pinpoint critical water activities that maximize the shelf life of powders.

The critical water activity has a direct relationship to other degradative phenomena such as glass transition and crystallization. As a fundamental physical property, the critical water activity can also be used to do modeling of powder stability both in package as well as in bulk storage. 

This webinar will explain the difference between water activity and moisture content and define a moisture sorption isotherm. It will also highlight the moisture sorption properties of several different powders and show how moisture sorption can be used to determine hygroscopisity, find the critical humidity for glass transition, observe crystallization, predict moisture migration, and determine shelf life in package. The information will be useful to anyone striving to control or improve the stability of powders.


Brady Carter
Research Scientist


Joe Florkowski
Managing Editor
Powder & Bulk Solids, UBM Canon