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Aircraft Sealants - Frequently
Asked Questions
Product Specifications for CS3204
fuel tank sealant
Chem Seal Technical Bulletin December, 1999
PRODUCT DESCRIPTION
meets AMS-S-8802 formerly Mil-S-8802F, Type II
CS 3204 is a fuel resistant sealant for use on integral fuel tanks and
pressurized cabins as well as other areas subject to contact with aircraft
fuels, lubricants, oils, water and/or weathering.
CS 3204 is a two-part polysulfide base compound which cures at room
temperature to a flexible, resilient rubber with excellent adhesion to aluminum,
magnesium, titanium, steel, and numerous other materials. CS 3204 is designed to
withstand the attack of sulpher compounds that are present in jet fuels. When
mixed, CS 3204 Class A is a self leveling liquid. CS 3204 Class B is a
thixotropic paste that will not flow or sag on vertical or overhead surfaces.
SURFACE PREPARATION
To obtain good adhesion, the surfaces must be free of all traces of oil, wax,
grease, dirt or other contamination. Working in small area segments, wipe the
surface using a clean rag doused in an oil free solvent. Before the solvent
evaporates, wipe the surface dry with a second clean rag. Maintain a clean
solvent supply by pouring the solvent on the washing cloth. CS 3204 will adhere
tenaciously to most substrates providing the surface to be sealed is clean and
sound.
MIXING INSTRUCTIONS
CS 3204 Parts A and B are carefully matched at the time of manufacture to
provide optimum performance when cured. Care should be taken to assure that
Parts A and B are combined as recommended on the container label. When mixing
pre-measured kits do not thin CS 3204 with solvents. Prior to combining with the
Part A component stir the Part B component until the contents of the
container are uniform. Place all of the B component into the Part A container
and continue stirring until a uniform gray color is achieved. There should be no
white or black streaks in the properly blended material. Periodically scrape the
sides and bottom of the container as well as the mixing tool to assure proper
mixing. When using a mechanical mixer, avoid high speeds since the heat
generated will reduce the application time of the mixed CS 3204. Violent
stirring will also entrap air in the cured sealant.
When mixing materials packaged in bulk or when only a small quantity is
required, stir 10 parts by weight of the Part B component into 100 parts by
weight of the Part A component. Be sure to stir the Part B prior to weighing out
the required amount.
CURE
Specified application and cure schedules are based on the standard conditions of
77°F and 50% relative humidity. Increased temperature and relative humidity will
reduce the work life and speed up the cure while reduced temperatures and
relative humidity will extend the work life and slow the cure. Cure may be
accelerated by heating up to 120°F. However care must be exercised to avoid the
entrapment of solvent when heat is applied.
STORAGE LIFE
The storage life of CS 3204 is nine months when stored in the original unopened
containers at temperatures below 80°F. Some change in work life, viscosity and
curing rate may occur during this period. However, such changes are slight and
in no way affect the end performance of the product.
APPLICATION
The work life of CS 3204 is indicated by the number following the class
designation and varies from 1/4 hour to 4 hours. Work life is the minimum amount
of time the material will maintain its application properties.
WORK LIFE APPLICATION TIME TACK FREE TIME CURING RATE TO 35 SHORE A
**1/4 1/4 HOUR 6 HOURS 16 HOURS
½ ½ HOUR 8 HOURS 30 HOURS
1 1 HOUR 15 HOURS 40 HOURS
2 2 HOURS 24 HOURS 72 HOURS
4 4 HOURS 36 HOURS 90 HOURS
** CS 3204 Class B-1/4 may be fuel immersed within two hours of application when
cured at standard conditions of 77 mF ± 5% Relative Humidity.
CLEAN UP
For surface preparation as well as removing fresh or cured CS 3204, Methylene
Chloride can be used. Cured CS 3204 will require a soaking period in Methylene
Chloride bases stripper for satisfactory removal.
SAFETY
CS 3204 Class A contains toluene within the limits called out by Mil-S-8802. The
maximum allowable concentration in the atmosphere of the work area is 200 ppm.
CS 3204 Class A should be used with adequate ventilation. For more information
refer to Bulletin Number SD-63 of the Manufacturing Chemists Association. Avoid
prolonged contact and wash with soap and water prior to eating or smoking. CS
3204 Class A has a flash point of 90°F. The flash point of CS 3204 Class B is
over 200°F. "Flamemaster supplied aviation fuel tank sealants and coating
materials are tested for compatibility with reference fluids and fuels as
specified by the applicable specification. Flamemaster does not warranty the
performance of fuel tank sealants or coatings subjected to fluids or fuels other
than those specified by the applicable specification." "It is the responsibility
of the user to determine the suitability for use utilizing the information
contained in the applicable specification."
PACKAGING
CS 3204 is packaged in the following kit sizes:
24 ea. per case 2 ½ oz. and 6 oz. cartridges
16 ea. per case Pint Kits
16 ea. per case Quart Kits
4 ea. per case Gallon Kits
CS 3204 is also available in 5-Gallon Kits and 50 Gallon Drum Kits.
Refer to the applicable Material Safety Data Sheet prior to using this
product.
All recommendations, statements, and technical data contained herein are
based on tests we believe to be reliable and correct, but accuracy and
completeness of said tests are not guaranteed and are not to be construed as a
warranty, either expressed or implied. User shall rely on his own information
and tests to determine suitability of the product for the intended use and user
assumes all risk and liability resulting from his use of the product. Seller's
and manufacturer's sole responsibility shall be to replace that portion of the
product of this manufacturer which proves to be defective. Neither seller nor
manufacturer shall be liable to buyer or any third person for any injury, loss,
or damage directly or indirectly resulting from use of, or inability to use, the
product. Recommendations or statements other than those contained in a written
agreement signed by an officer of the manufacturer shall not be binding upon the
manufacturer or seller.
Do the quart and pints include
catalyst
Yes, all CS and Pr products are sold as a kit and contain the
catalyst
Is CS3204 interchangeable with
PR1422
Yes, both are fuel tank sealants and have the same mil-spec
What is a Semkit
Semikits are disposable cartridges that contain the material and
the catalyst in a single cartridge but separated by a barrier. Mixing is
accomplished with a built-in mixing rod.
Difference between 1/2 and 2 as in
CS3204-B2 or CS3204-B1/2
2 is generally 2 hours minimum application life
1/2 is generally 1/2 hour minimum application life
Many of our customers use 1/2 in the winter months and 2 in the summer
Difference between A and B
Class A sealants is a brushable material and generally ships as HAZARDOUS
FLAMMABLE
Class B sealants are fillet material for sealing gaps, voids, and seams.\
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