Difference between revisions of "Perlite"
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2: pearlite; pearlstone | 2: pearlite; pearlstone | ||
| − | == | + | == Risks == |
| − | + | * Noncombustible. | |
| + | * Resistant to insects, bacteria and fungi. | ||
| − | + | ==Physical and Chemical Properties== | |
| − | Can expand 6-20 times when heated. | + | * Unaffected by water, acids, alkalis or organic solvents. |
| + | * Luster = waxy | ||
| + | * Color= gray, green or brown (unexpanded) | ||
| + | * Can expand 6-20 times when heated. | ||
| + | * Expanded perlite can absorb 200-500% of its weight in liquid. | ||
| − | + | ==Resources and Citations== | |
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| − | == | ||
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* G.S.Brady, ''Materials Handbook'', McGraw-Hill Book Co., New York, 1971 Comment: p. 641 | * G.S.Brady, ''Materials Handbook'', McGraw-Hill Book Co., New York, 1971 Comment: p. 641 | ||
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* ''The American Heritage Dictionary'' or ''Encarta'', via Microsoft Bookshelf 98, Microsoft Corp., 1998 | * ''The American Heritage Dictionary'' or ''Encarta'', via Microsoft Bookshelf 98, Microsoft Corp., 1998 | ||
| − | * ''Encyclopedia Britannica'', http://www.britannica.com Comment: "Perlite." | + | * ''Encyclopedia Britannica'', http://www.britannica.com Comment: "Perlite." Accessed 18 Aug. 2004 . |
[[Category:Materials database]] | [[Category:Materials database]] | ||
Latest revision as of 17:00, 10 August 2022
Description
1) A eutectic material formed between ferrite and cementite.
2) A type of obsidian, or natural glass, found in California that is 70-75% silica, 12-14% alumina and 6-8% alkalis. Perlite contains a high proportions of cracks, spheroids and water. When it is flash roasted to 1000 C, perlite expands to 20 times its size forming bubble-filled beads. This expanded white aggregate is then crushed and used as an extender, a fire-resistant insulator and a component in potting soil. Expanded perlite is also used to make insulating brick.
Synonyms and Related Terms
2: pearlite; pearlstone
Risks
- Noncombustible.
- Resistant to insects, bacteria and fungi.
Physical and Chemical Properties
- Unaffected by water, acids, alkalis or organic solvents.
- Luster = waxy
- Color= gray, green or brown (unexpanded)
- Can expand 6-20 times when heated.
- Expanded perlite can absorb 200-500% of its weight in liquid.
Resources and Citations
- G.S.Brady, Materials Handbook, McGraw-Hill Book Co., New York, 1971 Comment: p. 641
- Richard S. Lewis, Hawley's Condensed Chemical Dictionary, Van Nostrand Reinhold, New York, 10th ed., 1993
- Robert Fournier, Illustrated Dictionary of Practical Pottery, Chilton Book Company, Radnor, PA, 1992
- Random House, Webster's Encyclopedic Unabridged Dictionary of the English Language, Grammercy Book, New York, 1997
- The American Heritage Dictionary or Encarta, via Microsoft Bookshelf 98, Microsoft Corp., 1998
- Encyclopedia Britannica, http://www.britannica.com Comment: "Perlite." Accessed 18 Aug. 2004 .