Editing Mineral wool (section)

=== Types ===

There are several types of high-temperature mineral wool made from different types of minerals. The mineral chosen results in different material properties and classification temperatures. 

==== Alkaline earth silicate wool (AES wool) ====

AES wool consists of amorphous glass fibers that are produced by melting a combination of calcium oxide (CaO−), magnesium oxide (MgO−), and silicon dioxide (SiO<sub>2</sub>). Products made from AES wool are generally used in equipment that continuously operates and in domestic appliances. Some formulations of AES wool are bio-soluble, meaning they dissolve in bodily fluids within a few weeks and are quickly cleared from the lungs.<ref name=":0">{{Cite news|url=http://insulationet.com/en/materials/high-temperature-wool/|title=High temperature insulation wool - Production, Properties, Classification|work=insulatioNet.com|access-date=2018-06-24|language=en-US}}</ref><ref>{{Cite web|url=http://icanz.org.au/health-and-safety/biosolubility-faqs/|title=Biosolubility FAQ's|website=ICANZ|language=en-US|access-date=2019-01-19}}</ref>

==== Alumino silicate wool (ASW) ====

Alumino silicate wool, also known as refractory ceramic fiber (RCF), consists of amorphous fibers produced by melting a combination of aluminum oxide (Al<sub>2</sub>O<sub>3</sub>) and silicon dioxide (SiO<sub>2</sub>), usually in a weight ratio 50:50 (see also VDI 3469 Parts 1 and 5,<ref name="VDI">VDI Guideline: VDI 3469 Part 1 - Overview  Part 5 – High-Temperature Insulation Wool</ref> as well as TRGS 521). Products made of alumino silicate wool are generally used at application temperatures of greater than 900&nbsp;°C for equipment that operates intermittently and in critical application conditions (see Technical Rules TRGS 619).{{Citation needed|date=January 2019}}

==== Polycrystalline wool (PCW) ====

Polycrystalline wool consists of fibers that contain aluminum oxide (Al<sub>2</sub>O<sub>3</sub>) at greater than 70 percent of the total materials and is produced by [[Sol–gel process|sol–gel method]] from aqueous spinning solutions. The water-soluble green fibers obtained as a precursor are crystallized by means of heat treatment.<ref name="VDI" /> Polycrystalline wool is generally used at application temperatures greater than 1300&nbsp;°C and in critical chemical and physical application conditions.

==== Kaowool ====

Kaowool is a type of high-temperature mineral wool made from the mineral [[kaolin]]. It was one of the first types of high-temperature mineral wool invented and has been used into the 21st century.<ref name=":1" /> It can withstand temperatures close to {{convert|1650|C|F}}.<ref>{{Cite web|url=https://www.fabricationspecialties.com/pdf/hightemp.pdf|title=Thermal Ceramics}}</ref>