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Vermiculite is a 2:1 clay, meaning it has two tetrahedral sheets for every one octahedral sheet. It is a limited-expansion clay with a medium shrink–swell capacity . Vermiculite has a high cation-exchange capacity (CEC) at 100–150 meq /100 g.
In a study comparing lightweight expanded clay aggregate (LECA) and expanded vermiculite (EV), two materials used to make concrete, to a mycelium grown brick, the mycelium grown brick was found to be a better insulator. [13] These results are similar when comparing a different mycelium based composite with extruded polystyrene.
Polyurethane rigid panel (pentane-expanded) aged 5–10 years 2.54: 1 0.97: 5.5: 38 Foil-faced polyurethane rigid panel (pentane-expanded) 2.54: 1 1.1–1.2: 45–48 [3] Foil-faced polyisocyanurate rigid panel (pentane-expanded) initial 2.54: 1 1.20: 6.8: 55 [3] Foil-faced polyisocyanurate rigid panel (pentane-expanded) aged 5–10 years 2.54 ...
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Heat-expanded lightweight pebbles. Lightweight expanded clay aggregate (LECA) or expanded clay (exclay) is a lightweight aggregate made by heating clay to around 1,200 °C (2,190 °F) in a rotary kiln. The heating process causes gases trapped in the clay to expand, forming thousands of small bubbles and giving the material a porous structure.
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Vermiculite. Like perlite, vermiculite is a mineral that has been superheated until it has expanded into light pebbles. Vermiculite holds more water than perlite and has a natural "wicking" property that can draw water and nutrients in a passive hydroponic system.