- Any contamination such as oil, rust, scale, corrosion & different types of coatings and surface treatments cover the discontinuity opening and prevent entry of penetrant in to it.
- To detect the discontinuities, test surface shall be free from above mentioned contamination, otherwise indications will not appear.
Surface contamination closes Discontinuity openings : Surface cleaning plays critical role for effective penetration testing
MICRO NDT SOLUTIONS & TRAINING INSTITUTE 