Which marking material is commonly allowed for high-temperature turbine components?

Which marking material is commonly allowed for high-temperature turbine components?

• A. Layout Dye
• B. Commercial felt tip pen
• C. Chalk
• D. Tape

Answer: (B)

The key idea is choosing a marking method that remains useful during handling and machining of hot turbine parts without leaving residues or contaminating surfaces. A commercial felt-tip pen is the best choice because it provides a clear, precise mark that is easy to see and can be removed with standard cleaners after work, minimizing residue or interference with coatings. Chalk tends to rub off, tape can leave adhesive residues, and layout dye may leave staining or require more aggressive cleanup, making them less suitable for high-temperature components.

The key idea is choosing a marking method that remains useful during handling and machining of hot turbine parts without leaving residues or contaminating surfaces. A commercial felt-tip pen is the best choice because it provides a clear, precise mark that is easy to see and can be removed with standard cleaners after work, minimizing residue or interference with coatings. Chalk tends to rub off, tape can leave adhesive residues, and layout dye may leave staining or require more aggressive cleanup, making them less suitable for high-temperature components.