ASTM D3639/D3639M-92 (R2019) PDF Download

ASTM D3639/D3639M-92 (R2019) is a standard test method that outlines the procedure for the dry classification of chrysotile asbestos fibers based on their length distribution. The test involves passing the milled chrysotile asbestos through a series of screens, and the mass fractions retained on each screen are used to classify the asbestos grades.

It is important to properly condition the specimens before testing and ensure that they have a moisture content of less than 3% as per Method D2987. Specimens that are not adequately conditioned or have excessive moisture content may yield inconsistent and inaccurate results.

While the Quebec Standard Test can classify some amphibole asbestos fibers, it should be noted that a standard classification for these fibers has not been established.

The standard also includes a warning regarding the hazardous nature of asbestos dust. Breathing in asbestos dust can pose significant health risks for both users and those who come into contact with it. Therefore, it is crucial to take necessary precautions to minimize dust generation, especially when working with asbestos-cement products. For detailed guidelines on the safe use of chrysotile asbestos, reference should be made to the "Safe Use of Chrysotile Asbestos: A Manual on Preventive and Control Measures."