CSST EXAM 2025
white, large, cylindrical fibers
Chrysotile properties
brown, short, hydrophobic
Amosite properties
blue
Crocidolite properties
sharp, barb-like fibers
Tremolite properties
CSST EXAM 2025.pdf CSST EXAM 2025 //2026
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green
Actinolite properties
packings, gaskets, RSF, roofing products
Category 1 non-friable ACM
everything else non-friable
Category 2 non-friable ACM
removal of TSI or surfacing material (requires respirator)
Class I asbestos work
CSST EXAM 2025.pdf CSST EXAM 2025 //2026
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removal of all other ACM (requires respirator)
Class II asbestos work
work being done where any ACM is likely to be disturbed (requires respirator)
Class III asbestos work
work being done where any ACM might be contacted
Class IV asbestos work
unintentional disturbance of ACM more than 3 sq ft
major fiber release episode
CSST EXAM 2025.pdf CSST EXAM 2025 //2026