Technical data
d. For air and water-driven abrasive removal operations
unless otherwise noted, the same materials listed for
chemical removal operations shall be used for masking
of areas which will not be exposed to direct impinge-
ment of the abrasive media to prevent abrasive media
intrusion. Impact stripping tape shall be applied with hot
glue to mask areas which will be exposed to direct
impingement of the bicarbonate of soda and water and
plastic blast media as an alternate for masking for
Plastic Media Blasting (PMB) subject to the restrictions
following.
Materials:
Hot Glue Gun - Polygun PC Applicator 3M Co.
PN 99302 or
PN AIS 7000K, 4940-01-512-7768
Hot Glue - 3M Co.
PN 3748 TC, 8040-01-390-9728 or
PN AIS 5050, 6850-01-512-7763
Cotton Rope
Caulking Cord - More - Tite Putty
Impact Stripping Tape
80 mils thick, 20 oz/in peel strength, 250% to 300%
elongation, Shore A hardness 70-80
Anchor Continental BT-100 or
3M Co. PN 500 Series (ex. 500, 506, 528, etc.)
Impact Stripping Tapes 500 are available in 30 feet
long rolls under NSNs:
9390-01-359-7367 (1 in wide/9 rolls per box)
9390-01-359-7368 (2 in wide/6 rolls per box)
9390-01-359-7369 (3 in wide/3 rolls per box)
These are rubberized tapes capable of withstanding a
direct nozzle blast from PMB or bicarbonate of
soda and water blast equipment for a maximum of
two seconds.
2.3.1 Application. Hot glue is used to seal seams, covers
and access panel gaps less than 3/16 inch and to seal seams
and edges of impact tape for added protection. Fluid wicks
fabricated from cotton rope are sealed in place using this
material, and are installed at saturated seams prior to sealing
with hot glue. Caulking cord is used to fill seams and gaps in
excess of 3/16 inch. Impact tape is used to protect areas not
to be blasted.
2.3.2 Procedures.
Care must be taken to prevent hot glue from
dripping on skin or into eyes. Wear safety
goggles.
Media intrusion into engines, gun assemblies,
avionics, or actuators can severely damage these
components. Extreme care must be exercised to
mask every possible intrusion site.
Cover all antennas with impact tape. When masking off large
areas, such as vents, use hard cardboard, sheet metal or
equivalent, reinforced with impact tape over the side that will
be exposed to PMB or bicarbonate of soda and water blast
media. When placing cover in position, use impact tape to
hold in place, and apply hot glue to seal edges. Seal all edges
of all impact tape with hot glue to eliminate possibility of tape
peeling. In seams or protrusions where slow hydraulic leaks
compromise masking integrity, install a fluid wick (cotton
rope) with a minimum four inch length and seal in place with
hot glue. Aircraft mold line drain holes shall be plugged with
rubber stoppers or equivalent and sealed with hot glue.
2.3.2.1 A detailed step-by-step checklist specifying the
masking procedure shall be prepared for all finish system
removal operations. This checklist shall be used to ensure that
all required masking is accomplished prior to removal opera-
tions and that all masking is removed afterwards. The
following areas shall be masked and/or otherwise protected
for chemical and air or water driven abrasive finish system
removal operations:
a. Close all windows, doors, and hatches on aircraft or
equipment; and mask gaps between the structure and
these components. For air or water driven abrasive
removal operations, these gaps may be stuffed full with
sheets of MIL-PRF-131, Class 1, barrier material or
heavy duty (0.004 inch thick) polyethylene or vinyl
plastic film sheet to prevent abrasive media intrusion.
b. Mask all transparent plastic and glass surfaces such as
windows, canopies, and blisters; because they will be
crazed, frosted, or lose transparency if exposed to
chemical removers or if air or water-driven abrasive
media strikes them. For air or water-driven abrasive
removal operations, optional form-fitting metal or wood
shields may be fabricated for canopies and blisters in
conjunction with 3M Co. PN 510, 3M Co. 500, 510, or
Bron Tape, PN 818 material cut to the exact size for
windows. These tapes are available in 30-foot long rolls
under NSNs 7510-01-300-2124 (1 in), 7510-01-300-
2125 (2 in), 7510-01-300-2126 (3 in), 7510-01-300-
2127 (4 in), up to 30 in (special order).
TO 1-1-8
2-3