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Category: Glossary

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DNEL

DNEL stands for ‘Derived No-Effect Level’. It represents, for a particular substance, the level of exposure that should not be exceeded in people (workers and/or the general public). Read more »

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Biopersistence

Biopersistence is the characteristic of a fibre to persist in the lung, involving or implying resistance to both dissolution and mechanical breakage. Biopersistence can only be directly measured in in vivo test systems, i.e. following inhalation, instillation or injection in experimental animals. The rate of removal of fibres is typically expressed as “half life” – the time it takes for the number of fibres in the lungs to be reduced by 50%. Read more »

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Devitrification

Devitrification is the process by which prolonged high temperatures can alter the physicochemical properties and crystalline structure of amorphous HTIWs (AES and ASW), resulting in reduced resiliency and mechanical strength.

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Fibre toxicology

Driven by knowledge of the health effects of asbestos, extensive research has been conducted to evaluate the potential toxicity of many fibrous materials, including HTIW. Read more »

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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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Alumino Silicate Wool (ASW)

Alumino Silicate Wools, also known as “Refractory Ceramic Fibres” (RCF), are amorphous fibres produced by melting a combination of Al2O3 and SiO2.

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New Glossary and Q&A document available

As an additional source of information for interested, non-expert, individuals, ECFIA has compiled a glossary of terms and a ‘Questions and Answers’ document on HTIW-related topics. As experts in this area our aim is to publicise correct definitions and terms, allowing all involved parties easy, transparent communication on these sometimes very complex issues.

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Alkaline Earth Silicate (AES) Wool

AES wools consist of amorphous fibres produced by melting a combination of CaO, MgO and SiO2. Key features of AES products are low thermal conductivity, low linear shrinkage and low biopersistence.

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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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Dutch Expert Committee on Occupational Safety (DECOS)

At request of the Minister of Social Affairs and Employment, the Health Council of the Netherlands evaluates and judges the carcinogenic properties of substances to which workers are occupationally exposed. The evaluation is performed by the subcommittee on Classifying Carcinogenic Substances of the Dutch Expert Committee on Occupational Safety (DECOS) of the Health Council.

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