Vermiculite is a mineral, hydrated magnesium aluminum silicate, with a highly variable and complex chemical composition. It crystallizes in a monoclinic system, most often in the form of lamellar clusters, crystals or plates. It is golden-beige in color. It is a product of mica weathering (phlogopite, i.e. brown mica, or biotite, i.e. black mica). It contains compounds of magnesium, iron, aluminum, oxygen and hydrogen. It is mainly mined in the USA, Africa, Australia and Asia. In Poland, it occurs in Lower Silesia, but these are unsuitable for exploitation.
A characteristic feature of vermiculite is even a 20-fold increase in volume during high-temperature processing. This process produces expanded vermiculite in the form of swollen accordions. Vermiculite in exfoliated (expanded, expanded) form is light, non-flammable, compressible, very absorbent, perfectly insulates sound and heat, is non-flammable, non-reactive, has a unique ability to store and release moisture. It is also completely safe for people and the environment. A very wide range of temperatures in which it can be used (from -260 to 1200 ° C) makes it a very wide range of applications.
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VERMICULITE |
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| SUPERFINE | FINE | MEDIUM | LARGE | |
| grain size | % | % | % | % |
| 4 mm | 8-50 | 55-95 | ||
| 2 mm | 0-1 | 20-35 | 20-45 | 3-20 |
| 1,6 mm | 0-2 | 18-30 | 5-20 | 1-10 |
| 1 mm | 8-40 | 20-40 | 5-20 | 1-10 |
| 0,5 mm | 10-55 | 5-15 | 5-15 | 0-8 |
| 0,25 mm | 10-30 | 2--10 | 1-5 | 0-3 |
| Bulk density |
110-120 kg/m3 |
80-100 kg/m3 |
60-110 kg/m3 |
70-110 kg/m3 |
| Moisture | max 5% | max 5% | max 5% | max 5% |
| PHYSICAL PROPERTIES | |
| form solid | state in the form of granules with a lamellar structure with a grain size of 0-8 mm |
| smell |
without smell |
| pH | 6,5-7,5 |
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flammable |
non-flammable class A1 |
| Relative density, bulk density | bulk density 60-200 kg/m3 |
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temperature / melting range |
above 1300oC |
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self-ignition temperature |
not applicable |
| thermal conductiv | 0,050-0,065 W/m x K |
| water absorption | up to 150% |
| compressive strength | 0,14-0,40 Mpa |
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chemical resistance |
like glass |
| acoustic absorption | 10-92% |
| specific hea | 0,84-1,08 kJ/kgoC |
| CHEMICAL PROPERTIES | |
| Chemical composition |
Composition % |
| SiO2 | 38-46% |
| Al2O3 | 10-16% |
| MgO | 16-35% |
| Fe2O3 | 6-13% |
| TiO2 | 1-3% |
| CaO | 1-5% |
| K2O | 1-6% |
| H2O | 8-16% |
| other | 0,2-1,2% |
ZASTOSOWANIA (klinij interesujące zastowanie)
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