Foreign studies

1, D. M. Bernstein et al., (Biopersistance and Inhaled micro fibres)

Many recent studies of Dr. David M. Bernstein's research team clearly show the weak biopersistance of micro fibres of chrysotile from all sources compared to other respirable fibres like the amphiboles, cellulose, aramids and refractory  ceramic. Weak biopersistance in the respiratory system is generally associated with low risk of developing respiratory diseases.

A partial list of scientific publications of Dr. Bernstein's team :

The health effects of chrysotile : Current perspective based upon recent data Regulatory toxicology and pharmacology. 45 (2006) 252-264 Received 22 august  2005 available on line at http://www.sciencedirect.com/

The biopersistance of Brazilian chrysotile asbestos following inhalation.
Inhalation Toxicology, 16 : 745-761, 2004

The biopersistance of Canadian chrysotile asbestos following inhalation :
Final results through 1 year after cessation of exposure.
Inhalation Toxicology, 17: 1-14, 2005

Comparison of Calidria chrysotile asbestos to pure tremolite :
Inhalation biopersistance and histopathology following short
term exposure.
Inhalation Toxicology, 15: 1387-1419, 2003

The Toxicology response of Brazilian chrysotile asbestos:  A multi-dose sub-chronic 90-day inhalation toxicology study with 92 day recovery to assess cellular and pathological response.
Inhalation Toxicology, Vol 1B, Issue 4, February 2006

3. D. J. Paustenback et al. (Safety of friction products with chrysotile)

D.J. Paustenback's group in the United States catalogued 45 epidemiological studies related to the fabrication, use and repair of friction products (vehicle brake linings and pads) from 1900 to date. They conclude that the risk related to the use of chrysotile fibres in these products is practically zero for the employees fabricating or preparing these products and for the users of them.

Ref :     Paustenback, D.J. et al. Environmental and health Hazards associated with the presence of asbestos in brake linings and pads (1900 to present) :«A State-of-the-Art review» Part B, 7:33-110, 2004