The Health and Safety Laboratory (HSL) have investigated claims that chrysotile asbestos in asbestos cement products is altered into a non-asbestos fibrous material called Casitile.

The claims also suggested that this process is 100% efficient and no chrysotile asbestos remains in the matrix and no release of airborne chrysotile fibres can occur.

The HSL investigation refutes these claims and confirms that chrysotile fibres are present in the cement matrix, often as quite large fibre bundles which are clearly visible to the eye and that when asbestos cement is disturbed, chrysotile fibres are released from the cement into the air.

A copy of the HSL report can be found on their website.