Which is generally the more acceptable method for cleaning parts prior to penetrant testing?

Which is generally the more acceptable method for cleaning parts prior to penetrant testing?

• A. Water wash
• B. Vapor degreasing
• C. Solvent wipe
• D. Pressurized air

Answer: (B)

Removing surface contaminants that can block or mask defects is essential before applying penetrant. Vapor degreasing uses solvent vapors to dissolve oils and greases, lifting them from the surface so the part becomes clean and dry without leaving water residues or oily films. This approach provides a consistent, thorough clean across many materials and geometries and minimizes the risk of moisture or residue interfering with the penetrant. Water wash can leave moisture and residues if drying isn’t perfect, which can affect defect indication. A solvent wipe may remove oil but can leave solvent residues, is flammable, and depends on technique. Pressurized air alone only removes loose debris and doesn’t adequately remove oils or greases.

Removing surface contaminants that can block or mask defects is essential before applying penetrant. Vapor degreasing uses solvent vapors to dissolve oils and greases, lifting them from the surface so the part becomes clean and dry without leaving water residues or oily films. This approach provides a consistent, thorough clean across many materials and geometries and minimizes the risk of moisture or residue interfering with the penetrant.

Water wash can leave moisture and residues if drying isn’t perfect, which can affect defect indication. A solvent wipe may remove oil but can leave solvent residues, is flammable, and depends on technique. Pressurized air alone only removes loose debris and doesn’t adequately remove oils or greases.