Perlite for Textured Coatings
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Perlite /br Textured Coatings The physical character ofexpanded perlite lends itself to a variety of special purposes—including For a detailed explanation of perlite expansion, see info sheet: "Why Perlite Works" in the Information Perlite offers advantages perlite provides low cost bulk filling and a white color to reduce pigmenta- tion costs. Because perlite is light in weight, shipping and handling costs are reduced. The light weight of perlite textured coatings reduces the tendency of thick films to sag and run. As a result, applicators can apply heavier coatings in a single pass with subsequent labor savings. In addition, because perlite is inorganic and inert, it does not contribute to yellowing in industrial atmospheres. Even as a coating, applicators can benefit from perlite's unique insulating properties. Variety of Textures Possible Perlite is available in different grades ranging from fine to coarse material. The table below provides general guidance on textures that may be achieved with different perlite particle sizes. Aggregate Blending Expanded perlite is a mineral aggregate and the coarser particle sizes will not withstand high shear rates during mixing. Slow speed mixing with broad paddles is recommended. Mixer horsepower require- ments would be approximately 10 horsepower per 250 gallon (1000 liter) batch at mixing speeds in the range of 50-200 rpm. Formulations requiring a high level of shear should be mixed with high speed equipment prior to the addition of perlite. Provisions should be made to allow for 40% bulking while perlite is being added to the coating mix. ^UTEiNsr/n^ Perlite Institute, Inc. Copyright © 2013 Perlite Institute All Rights Reserved