Originally posted by stevebrot MPK?
Steve
MPK has replaced MEK (methyl ethyl Ketone) as the all around cleanup solvent and thinner for seal. MPK is supposed to be 'better' for the environment as well as those who use it.
It still is hazardous to use and handle, as are many other chemicals and compounds used in aviation.
Quote: Low-density, biodegradable Methyl Propyl Ketone (MPK) is suited for metal degreasing, ink removal, and industrial cleaning fluids. It can replace MEK in hand wipes used for surface preparation of military and commercial aircraft. Solvent removes solids, hydraulic oils, sealants, and other contaminants from aircraft surfaces. Compatible in most coatings formulations, MPK dissolves with array of resins, including acrylics, polyesters, epoxies, vinyls, and alkyds.
I mentioned seal.
Seal is used everywhere in the airplane. Seal is used on all faying surfaces. Seal is used to create a leakproof seam for the fuel tanks in the wings. Seal is used to level gaps on all exterior panel joints. Seal is used to prevent corrosion.
Seal contains toluene.
Then there is the hexavalent chromium.
All of the various primers have it as a corrosion prevention measure. A commercial airliner is designed to have a service life of 30 years. The prevention of corrosion is paramount to a long and useful life.
And there are many other 'wonderful' chemicals.
All so people can glide along in the friendly skies.