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Tag Archives: PCW

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Polycrystalline Wools (PCW)

Polycrystalline Wools (PCWs) are made predominantly of aluminum (content typically 72-99% in the form of oxide) with the remainder consisting of silicon. The fibres are manufactured by sol-gel technology using gel extrusion, spinning and/or drawing in controlled air streams, using equipment/processes specifically designed to produce fibres of defined dimensions. These are then subjected to high-temperature treatment to produce the required polycrystalline structure.
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Characteristics of High Temperature Insulation Wools

High Temperature Insulation Wools (HTIW) are made of synthetic vitreous or polycrystalline mineral wools. These are defined by a classification temperature above 1000 °C and are typically used at temperatures above 600°C. HTIW are necessary for many high-tech products owing to their versatile characteristics – including, for example, high temperature resistance, low thermal conductivity, excellent thermal shock resistance, chemical neutrality, great flexibility, low thermal mass and light weight.

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High Temperature Insulation Wool (HTIW)

In the 1950s, the term “Refractory Ceramic Fibre” was coined for the Alumino Silicate Wool (ASW) products developed at this time. On account of their chemical purity and resistance to high temperatures (classification temperature >1000 °C) as well as on the basis of their use in other applications, this definition was made to differentiate these materials from the conventional “mineral wools”.

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