Glossary

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9. Glossary
For the purposes of this code, the following definitions apply:
Amorphous:
Non-crystalline, glassy in character, having no molecular lattice structure;
synonym for vitreous.
Application:
A practice involving the use of synthetic vitreous fibre insulation wools.
Binder:
A substance that glues together otherwise loose fibres so that the product can be
shaped into batts, rolls, and so on; usually a phenol-formaldehyde or urea-
formaldehyde resin.
Biopersistence:
The ability of a fibre to remain in the lung. Biopersistence is a function of the
solubility of the fibre in the lung, and the biological ability of the lung to clear the
fibre from the lung.
Building clients:
Owners or tenants of buildings where insulation work is to be carried out.
Carcinogen:
A substance or agent that has the potential to produce or incite cancer.
Competent authority:
Any official service or public authority with the power to issue or approve decrees,
orders, regulations or other provisions having the force of law concerning the
health and safety of workers.
Employer:
A legal person who manufactures, uses or removes insulation wools, with
recognized responsibility, commitment and duties towards a worker in his or her
employment by virtue of a mutually agreed relationship. (A self-employed person
is regarded as having the duties of an employer and a worker.)
Engineering controls:
The use of technical measures such as enclosure, ventilation and workplace design
to minimize exposure.
Exposure limits:
Airborne concentrations of workplace contaminants, such as fibres or dust,
determined as appropriate for control purposes by the competent authority. The
terms adopted by the competent authority vary from country to country and
include: administrative control levels; maximum allowable concentrations;
permissible exposure limits; occupational exposure limits; and threshold limit
values.
Glass wool:
A synthetic vitreous fibre insulation wool made by melting sand and other
inorganic materials, and then physically forming the melt into fibres.

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