magnesium chromate as a corrosion inhibitor. The
classification of this sealant compound is of the
following types:
Type I — For brush or dip application
Type II— For extrusion application, gun or
spatula
Type III — For spray gun application
Dash numbers after the type code are used to
designate the maximum application time in hours.
Type I dash numbers are –1/2 and –2. Type II dash
numbers are –1/2, –2, and –4. The Type III dash
number is –1.
SAFETY PRECAUTIONS
Many of the sealants previously discussed maybe
flammable or may produce toxic vapors. When you
are using any material designated as flammable, all
sources of ignition must be at least 50 feet away from
the location of the work. Toxic vapors are produced
by the evaporation of solvents or the chemical
reaction taking place in the curing sealants. When
you are using sealants in confined spaces, such as fuel
cells, fuselage, or wing sections, adequate local
exhaust ventilation must be used to reduce the vapors
below the maximum allowable concentration. The
vapors must be kept at that level until repairs have
been completed. Do not eat or smoke when you are
working with sealants.
RECOMMENDED READING LIST
NOTE: Although the following references were
current when this TRAMAN was published, their
continued currency cannot be assured. Therefore,
you need to be sure that you are studying the latest
revision.
Aviation Maintenance Ratings Fundamentals,
NAVEDTRA 12010, Naval Education and
Training Program Management Support Activity,
Pensacola, Florida, July 1990, Chapter 4.
General Advanced Composite Repair Manual, Tech
Order 1-1-690, Secretary of the Air Force,
Washington, D.C., 1 August 1990, Sections 1
through 6.
Fabrication, Maintenance and Repair of Transparent
Plastics, NAVAIR 01-1A-12, Naval Air Systems
Command Headquarters, Washington, D. C., July
1982.
General Use of Cements, Sealants, and Coatings,
NAVAIR 01-lA-507, Naval Air Systems
Command, Washington, D. C., February 1987.
Aircraft Weapons Systems Cleaning and Corrosion
Control, NAVAIR 01-lA-509, Commander,
Naval Air Systems Command, Washington, D.C.,
1 January 1992, Chapters 5 through 7.
Structural Sandwich Composites, MIL-HDBK-23A,
Department of Defense, Washington D. C., June
1974, Chapters 15 and 16.
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