Asbestos Types and Properties Flashcards

Amphibole asbestos fibres are characterised by what shape?

Answer: Straight and needle-like

Amphibole asbestos fibres (amosite and crocidolite) are straight and needle-like, making them particularly dangerous as they can penetrate deep into lung tissue. Serpentine fibres (chrysotile) are curly and flexible.

In which decade did the UK see the peak usage of asbestos in construction?

Answer: 1960s-1970s

Asbestos use in UK construction peaked during the 1960s and 1970s. Buildings constructed or refurbished during this period are most likely to contain asbestos-containing materials (ACMs).

What does the term 'friable' mean when describing asbestos-containing materials?

Answer: The material can be easily crumbled by hand pressure

Friable asbestos materials can be crumbled, pulverised, or reduced to powder by hand pressure. This is particularly dangerous as it means fibres can be easily released into the air.

Which of the following products is LEAST likely to contain asbestos?

Answer: A solid wood internal door from 1965

A solid wood door would not contain asbestos. However, Artex coatings, floor tiles, and pipe lagging from the 1960s-70s are all common asbestos-containing materials found in UK buildings.

What is the typical fibre diameter range of asbestos that makes it dangerous to health?

Answer: Less than 3 micrometres

Asbestos fibres less than 3 micrometres in diameter are respirable, meaning they can penetrate deep into the lungs. These fibres are invisible to the naked eye and can remain suspended in the air for hours.

Asbestos cement products typically contain what percentage of asbestos?

Answer: 10-15%

Asbestos cement products typically contain 10-15% asbestos fibres mixed with cement. While this is a relatively low percentage, the material can still release dangerous fibres when cut, drilled, or damaged.