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Amosite
Official definition:
Amosite asbestos was used to a lesser extent than chrysotile.
Most of the amosite asbestos used in the United States
was mined in South Africa. The name "amosite"
derives from the "asbestos mines of South Afica".
Amosite asbestos is an amphibole. Grunerite is the mineralogically
correct name used for amphiboles of the cummingtonite-grunerite
series in which iron is predominant over magnesium (70%
or more Fe / [Fe+Mg]).
Crystals of grunerite range in morphology from relatively
thick, flat prisms to acicular, brittle grains, to very
long, thin fibers and fiber bundles. The long thin fibers
are moderately brittle and often bend in wide arches.
Bundles of grunerite tend to separate into smaller groups
of needlelike fibers. Because grunerite fibers do not
normally fray or have split ends, but rather have flat
or knifelike ends, the needlelike morphology may help
to distinguish this amphibole from chrysotile. Forms
of bundles resembling "broom tails" are also
common. Small thin fragments of the mineral are common
in some building materials.
PVsurveys definition:
Brown asbestos ceased to be used in the UK in 1985.
CAWR
Official definition:
The Control of Asbestos at Work Regulation 2006 (pronounced
as “core”). The governments legislation
detailing how companies and duty holders must deal with
asbestos.
PVsurveys definition:
This is the legislation that was updated in
2006 requiring all owners or maintainers of “non-domestic”
properties, to become responsible for the possibility
of exposure to asbestos by staff, visitors or contractors
on their property. It requires people to survey the
premises and draw up a plan to manage such risks, AND
to keep it up to date.
Chrysotile
Official definition:
Know also as white asbestos – common form and
sometimes thought to be the “least dangerous”.
PVsurveys definition:
No asbestos is safe – all types and forms must
be treated appropriately and with great care. Finally
banned in 1999 in the UK.
Crocidolite
Official definition:
Crocidolite asbestos was the least used in commercial
products. Approximately 10% of the asbestos used in
the United States was crocidolite.
Crocidolite is the asbestiform variety of riebeckite.
Riebeckite is the name used for minerals of the glaucophane-crossite-riebeckite
series in which iron is predominant over magnesium and
aluminum. Crocidolite is called the "Blue Asbestos",
because it is strongly pleochroic, ranging from Prussian
blue and indigo blue to yellow green.
The characteristic form of crocidolite is similar to
that of chrysotile. The fibers generally resemble strands
of fine textured hair and are slightly more brittle
than chrysotile, but can usually bend beyond 90 degrees
before breaking. Typically curved, hairlike, but straight
fibers and bundles may also be found. Riebeckite cleavage
fragments may be found in association with true asbestiform
bundles. Crocidolite is harder than the other varieties
of amphibole asbestos.
PVsurveys definition:
Blue asbestos and generally accepted to be most dangerous
and banned form use in 1985.
Duty
Holder
Official definition:
PVsurveys definition:
HSE term for the person who is responsible for the
maintenance and upkeep of a building. This can lead
to confusion as it could be deemed as the landlord or
tenant of the building – both wishing it applies
to the other! In any event, everyone has a duty to comply
with the duty holder and to carry out such instructions
as they may require.
HSG
227
Official definition:
PVsurveys definition:
HSE book offering a comprehensive guide to managing
asbestos.
HSG
264
PVsurveys definition:
This HSE book called 'Asbestos: The survey guide' expanded on and replaced MDHS100. It is aimed at people carrying out asbestos surveys and people with specific responsibilities for managing asbestos in non-domestic premises under the Control of Asbestos Regulations 2006.
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