Aéronautique
Issued : 01/2013
PS 890 C 24
FUEL TANK SEALANT
USE
PS 890 class C is a flowable compound for sealing the
faying surface of integral fuel tanks and pressurized cabins.
It was especially developed for use over a temperature
range of - 55°C + 120°C with intermittent use to 135°C, and
with outstanding resistance to aircraft fuels (aviation gasoline
or jet fuel) and petroleum base lubrificating oil.
PRODUCT DESIGNATION
PS 890
CLASSE C Roller or brush application
APPLICATION TIME : 24 hours
DESCRIPTION
PS 890 Class C is a two-part sealant, based on
polysulfide liquid polymers and manganese accelerator.
After mixing, it cures at room temperature without shrinkage,
giving a firm and flexible sealant having excellent adhesion
to substrates aeronautical standards.
PACKAGING
SEMKITS :
Semkit 654
Semkit 655
SPECIFICATION
Tested and qualified according to BMS 5-45 specification
Standard conditions are:
23+/-2°C and 50+/-5% relative humidity
LE JOINT FRANCAIS
Division MASTICS ADHESIFS & PROFILES
84/116 rue Salvador Allende, 95870 Bezons
Tél 01.34.23.34.69 - Télécopie 01.34.23.35.25
http : \\www.ljfm.com
Base
volume
Number of
semkits/box
100 ml
55 ml
24
24
2/3
Tensile strength and elongation
APPLICATION PROPERTIES (typical)
Color
Base
Accelerator
PS 890C24
Issued :01/2013
white
black
Tensile
strenght
Elongation
300 %
100 : 10
- Standard cure
- Immersion JRF 7 days 60°C +
Heat exposure 48h 50°C
- Immersion skydrol 7 days 50°C +
2,7 MPa
Mixing ratio (by weight)
base/accelerator
2,85 MPa
380 %
Non volatile content
>88 %
Heat exposure 48h 50°C
0.5 MPa
110 %
Viscosity Brookfield
(#7 @ 2 rpm)
600 - 1200 Pa.s
Low temperature flexibility
- 54°C
No cracking , checking or loss of adhesion
Mixed compound
Assembly time (max/hours)
24 h
Fungus resistance
Non-nutrient
Resitance to other fluids
Excellent resistance to water, alcohols, petroleum-base and synthetic
PERFORMANCE PROPERTIES (typical)
lubricating oils, and petroleum-base hydraulic fluids.
Reparability
Color
Density
Hardness Shore A
Shear strenght
BMS 10-20 Type II grade A
grey
1,55
>45
Excellent to both freshly cured as well as fuel aged and abraded fillets.
>1,03 MPa
No corrosion, adhesion loss, softening, or blistering after 20 days
Corrosion resistance
immersion in salt water / JRF AMS 2629 at 60°C.
Adhesion - Peel strength (N/mm)
100 % Cohesive
7 days 23°C (or 72h 50°C)
Alodine 1200
MIL-A-8625 Type I
BMS 10-20 Type II grade A
BMS 10-20 Type II grade D
Results 95% cohesive minimum.
2,62
NOTE: The above application and performance property values are
typical for the material, but are not intended for use ispecifications or
for acceptance inspection criteria because of variations in testing
methods, conditions and configurations.
2,57
2,38
2,55
SURFACE PREPARATION
Fuel resistance
7 days 23°C + 7 days 60°C immersion in salt water 3%
+ thin layer JRF BMS 5-45
Alodine 1200
1,9
MIL-A-8625 Type I
2,4
BMS 10-20 Type II grade A
2,4
BMS 10-20 Type II grade D
2,7
Results 95% cohesive minimum.
7 days 23°C + 7 days 60°C in JRF BMS 5-45
Alodine 1200
1,9
MIL-A-8625 Type I
2,3
BMS 10-20 Type II grade A
1,9
BMS 10-20 Type II grade D
2,5
Results 95% cohesive minimum.
Part shall be cleaned with solvents to remove dirt, grease, and
processing lubricants used in manufacturing.
Wash one small aera at a time, then dry with a clean cloth before solvent
evaporates to prevent redeposition of oil, wax or other surface
contaminents. To maintain a clean solvant supply, always pour the
solvent on the washing cloth.
MIXING INSTRUCTIONS
Proper mixing and correct proportions are extremely important if
optimum results are to be obtained. Mixing by experienced personnel at
a central location is recommended.
SEMKIT TWO-PART SEALANT CARTRIDGES
1° Wear safety glasses.
2° Hold cartridge and pull back dasher rod one fourth.
3° Pull back the dasher rod as injecting as proportionnaly as possible
the contents accelerator into the base.
4° Mix material, rotate dasher rod 90° in aspiral clockwise motion; with
each stroke turn the dasher rod 90°.
5° When two-parts are mixed thoroughly, pull dasher rod back to the
neck of cartridge, grasp cartridge firmly at neck, unscrew dasher rod
counterclockwise and remove.
6° Screw nozzle into cartridge, material is ready for extrusion.
For all information, consult the Technical Services of
LE JOINT FRANCAIS.
3/3
PS 890C24
Issued: 01/2013
APPLICATION INSTRUCTIONS
Application life is the period of time that the mixed compound remains
at a consistency suitable for application with injection or extrusion guns
PS 890 C 24 is used for wet mount of assembly elements and as a
sealant to make interpositions between the elements that are
overlapping. It can be applied by brush and roller. In most applications,
the sealant is applied on the joining surfaces with an average
thickness of 0.25 mm to ensure complete coverage of the surfaces
after assembly.
CURING
The lenght of the cure depends on the ambient temperatureand relative
humidity. The temperature/time relationship is approximately the same
for curing as it is for application life . Low humidities may extend the cure
several times. Cure may hastened by applying heat up to 55° C.
CLEANING EQUIPEMENT
Equipment should be cleaned immediately after use with
methylethylketone. Cured sealant on accessible portions of equipement
will peeled off by hand.
STORAGE LIFE
The storage life of PS 890 C 24 is 6 months when stored in the original,
unopened containers at temperature below 25°C.
HEALTH PRECAUTIONS
PS 890 C 24 is a safe material to handle when reasonable care is
observed. Ordinary hygienic principles, such as washing the compound
from hands before eating or smoking, should be observed.
For additional health and safety information consult the
Material Safety Data Sheet which is available upon request on
www.ljfm.com
GUARANTEED
We guarantee all our products against faulty materials or preparation.
Our sole responsability shall be to replace, free of charge, those
products which prove to be defective, the user being entitled to no
indemnity for any reason whatsoever. All recommendations contained
herein as to the choise of materials or of certain methods of operation
are of an informative character and are based on tests and experiments
we belive to be reliable and correct, but accuracy and completeness
of such tests are not guaranteed and are not to be construed as a
warranty, either express, or implied.
Neither our company, nor any of its collaborators shall be liable to the
user for any injury, loss or damage directly or indirectly resulting from
the use of, or inability to use, the products, which does not comply with
the application instructions as specified in our information manual.
Recommendations or statements other than those contained in a written
document signed by an officer of our company shall not be binding upon
the company.
Issued:01/2013