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Table 1 concentration level and contaminated surfaces

From: Nondestructive testing of contaminated CFRP surfaces with the BonNDTinspect® system

Contamination Concentration   
Z0 Z1 Z2 Z3 Z4 Z5 Z6
Release agent (µg/100 mm2) 0 <30 (0.125%) <30 (0.19%) <30 (0.22%) <30 (0.25%) 40 (0.60%) 50 (1.10%)
Hydraulic oil (µg/100 mm2) 0 235.56 408.89 1740.22 4213.33   
Fingerprint (100 mm2) 0 184.22 329.82 583.85   
Corundum (µg/100 mm2) 0 253.33 493.33 680.00   
CFRP-dust (µg/100 mm2) 0 244.44 471.11 915.56