12/11/2022 0 Comments Pdfinfo water chemistry![]() One of the first: using the white, lightweight perlite in place of sand for a plaster used to refinish the screen of a Phoenix-area drive-in theatre 1. A small pilot plant provided Boyer with enough expanded perlite to began exploring applications. They also worked to quantify the insulative, fire-proof and lightweight character of expanded perlite. Perfect to resist heat conduction! With further help from the Arizona Department of Mineral Resources, he discovered why-perlite contains a small percentage of trapped water in the raw ore. The popping that followed was a surprise, as was the end result-frothy mineral nuggets with a bubbly cellular structure of sealed pores. And then came the day he threw a shovelful of crumbled perlite into the open-end firebox of an old converted assay furnace. He’d been working for months to fuse a mixture of silicates with hopes of developing a new insulating material for the telephone industry. In 1939, Lee Boyer operated an assay office in Superior, Arizona. As is often the case, the fact that crushed perlite expands under high heat was discovered by accident. Grades of Expanded Perlite and Perlite Particle Size Expanded perlite can be manufactured to weigh as little as 2 pounds per cubic foot (32 kg/m3) making it adaptable for numerous applications. Perlite is a form of natural volcanic glass, and is classified as chemically inert, with a pH of approximately 7. While the crude rock (ore) may range from transparent light gray to glossy black, the color of expanded perlite ranges from snowy white to grayish white. The expansion process also creates one of perlite’s most distinguishing characteristics: its white color. The resulting expanded particles-actually clusters of minute glass bubbles-are spherical in shape, usually fluffy or frothy, highly porous due to a foam-like cellular internal structure, and have a very low density. Rapidly heating perlite ore to temperatures of about 900☌ (1,700☏) softens the volcanic glass, causing entrapped water molecules in the rock to turn to steam and expand the particles like popcorn. Closely related to pumice, it differs from other volcanic glasses principally in its combined water content, which produces the unusual characteristic of “popping”-expanding up to 20 times its original volume when exposed to rapid, controlled heating. ![]() Perlite ore is a glassy volcanic rock with a vitreous, pearly luster and a characteristic concentric or perlitic fracture. The Perlite Wheel: Summarizing the amazing versatility of perlite The Expansion Process The Perlite House: Applications for perlite in residential construction and landscaping Learn more about the specific uses and applications of perlite by clicking on the proceeding link and viewing the linked documents immediately below. Regarded as an essentially “environmentally safe” building material, perlite is incredibly versatile and is used in a wide range of products and processes in industry-as a soil amendment, as insulation, as a filter aid, as lightweight concrete aggregate, liquid waste stabilizer, and many more. ![]() PDFINFO WATER CHEMISTRY FREEIt is chemically inert, sterile, non-toxic and non-fibrous, free of organic impurities, and has a neutral pH. ![]() A Versatile MineralĮxpanded perlite exhibits very low thermal conductivity, low sound transmission, high fire resistance, a large surface area and controllable moisture retention and drainage. Perlite is marketed to industry in two forms-crude ore and as expanded particles in various size grades and even form factors-expanded particles (clusters of bubbles), crushed and milled expanded perlite, even individual bubbles/microspheres (using a sophisticated manufacturing technique). ![]() Harry Huntzicker, one-time director of research for US Gypsum Corp., as quoted in an article about perlite that ran in the December 1954 issue of Popular Mechanics magazine. “If, in the laboratory, we were to take natural elements and combine them into a perfect aggregate, we probably would end up with perlite.” That from Dr. ![]()
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