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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.
This is a list of insulation materials used around the world.. Typical R-values are given for various materials and structures as approximations based on the average of available figures and are sorted by lowest value.
Weight may cause ceilings to sag if the material is very heavy. Professional installers know how to avoid this, and typical sheet rock is fine when dense-packed. Will settle over time, losing some of its effectiveness. Unscrupulous contractors may "fluff" insulation using fewer bags than optimal for a desired R-value.
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.
Clay minerals can be classified as 1:1 or 2:1. A 1:1 clay would consist of one tetrahedral sheet and one octahedral sheet, and examples would be kaolinite and serpentinite. A 2:1 clay consists of an octahedral sheet sandwiched between two tetrahedral sheets, and examples are talc, vermiculite, and montmorillonite.
Top equal-weight index funds *Fund data as of May 9, 2024. Invesco S&P 500 Equal Weight ETF (RSP) The Invesco S&P 500 Equal Weight ETF tracks an equal weight S&P 500 index and is rebalanced quarterly.
The board can be sheet metal, fibre cement, magnesium oxide board (MgO), plywood or oriented strand board (OSB), and the core can either be expanded polystyrene foam (EPS), extruded polystyrene foam (XPS), polyisocyanurate foam, polyurethane foam, or be composite honeycomb (HSC).
2:1 clay minerals crystallographic structure made of three superimposed sheets of tetrahedra-octahedra-tetrahedra (TOT layer unit), respectively. The 2:1 layer (TOT) structure consists of two silica (SiO 2) tetrahedral (T) layers which are electrostatically cross-linked via an Al 2 O 3 (), or Fe 2 O 3, octahedral (O) central layer.