What solvent is recommended for removing grease from aircraft fabric prior to doping it?

Question

BlackTom AI · Accepted Answer

Methyl Ethyl Ketone (MEK) is the correct solvent because it chemically dissolves oils and greases and evaporates cleanly, allowing dope to adhere to a contaminant-free fabric.

1) Relevant knowledge points and concepts
- Doping aircraft fabric requires a surface free of oils, greases, or residues so the dope (a film-forming lacquer) can bond.
- “Like dissolves like”: organic solvents dissolve organic contaminants (oils/greases), while water, a polar solvent, does not effectively dissolve nonpolar oils.
- MEK (an organic ketone solvent) is commonly used in aviation fabric work for its solvency and fast evaporation, leaving little residue.

2) Step-by-step reasoning
- Identify the contaminant: grease/oil on fabric is nonpolar and hydrophobic.
- Test each option against the contaminant: water is polar and will not dissolve hydrophobic greases; a clean rag provides only mechanical action and cannot chemically remove embedded grease; MEK is an organic solvent that can solvate and lift grease from fibers.
- After MEK dissolves the grease, wiping and allowing evaporation leaves a clean, dry surface suitable for doping.

3) Intermediate steps (logical, not numeric)
- Apply solvent to a test area: MEK dissolves grease → wipe with rag → inspect fabric for remaining residue → allow solvent to evaporate completely.
- Ensure adequate ventilation and safety measures because MEK is flammable and has health hazards.

4) Why the correct answer is correct
- MEK’s solvent properties match the chemical nature of grease, so it removes contaminants that would prevent dope adhesion. It evaporates without leaving water-based residues that could interfere with the film.

5) Why other options are incorrect
- Clean rag: may remove loose dirt but cannot chemically dissolve embedded grease.
- Water: is ineffective for dissolving oils and will not remove grease; it may leave the fabric damp and could hamper dope application.

6) Conclusion
Methyl Ethyl Ketone (MEK) is the recommended solvent for removing grease before doping aircraft fabric, which matches the provided correct answer.

What solvent is recommended for removing grease from aircraft fabric prior to doping it?单项选择题

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