3M polyurethane protective boots installation tech bulletin User Manual
3
Polyurethane Protective Boots
Product Description
3M™ Polyurethane Protective Boots SJ8665, SJ8667, SJ8681, SJ8672, SJ8641, SJ8663 and
SJ8545 are made of an abrasion resistant polyurethane and are resistant to ultraviolet light. They
can be painted or applied over painted surfaces. They are available in a variety of shapes and
colors for many industrial and common aircraft applications (including radomes, wing tips,
landing gear pods, prop spinners, etc.). The product is constructed with a long-aging, solvent
resistant, pressure-sensitive acrylic adhesive, and protected with an easy-release liner.
SJ8545 are made of an abrasion resistant polyurethane and are resistant to ultraviolet light. They
can be painted or applied over painted surfaces. They are available in a variety of shapes and
colors for many industrial and common aircraft applications (including radomes, wing tips,
landing gear pods, prop spinners, etc.). The product is constructed with a long-aging, solvent
resistant, pressure-sensitive acrylic adhesive, and protected with an easy-release liner.
Technical Bulletin
March, 2006
Typical Physical
Properties and
Performance
Characteristics
for Polyurethane
Protective Boot
SJ8665
Properties and
Performance
Characteristics
for Polyurethane
Protective Boot
SJ8665
A. Dimensions
Approximate Applied Thickness:*
0.012 inch (0.30 mm) Film
Total thickness 0.014 inch (0.36 mm)
Total thickness 0.014 inch (0.36 mm)
Approximate Weight:
0.09 lb/ft
2
(440 g/m
2
)
Notes: 1) The following technical information and data should be considered representative or typical only
and should not be used for specification purposes.
2) ASTM = American Society for Testing and Materials.
3) Metric values are listed in parenthesis.
B. Typical Physical Properties and Performance Characteristics
Property
Test
Units
Typical
Method
Value
Tensile Strength @ Break
ASTM D882
lb/in (N/100 mm)
94 (1646)
Elongation % @ Break
ASTM D882
%
458
Taber Abrasion
H-18, 1000g wt,
Loss in grams
< 0.10
1000 cycle
Hardness
ASTM-D2240
Shore A
80
Dielectric Strength
ASTM-D1000
Volts
14,000
Dielectric Constant
@ 5.6 GHz
–
3.018
@12.8 GHz
2.940
Peel Adhesion @ 70°F (21°C) to:
Aluminum
ASTM D-1000
oz/in (N/100 mm)
92.6 (101.4)
Glass
24 Hr. Dwell
68.3 (74.8)
Epoxy Primer
111.5 (122.0)
Urethane Paint
78.8 (86.3)
High Solids Mil Spec Paint
77.1 (84.4)
High Solids Mil Spec Paint
108.2 (118.4)
(w/3M™ Promoter #86)
Solvent Resistance
24 hour
Motor Oil
immersion
Little or no apparent effect
Distilled Water
Little or no apparent effect
Hydraulic Fluid**
Little or no apparent effect
JP-4/JP-5 Aviation Fuel
Slight edge penetration
Diesel Fuel
Slight edge penetration
*There is a gradual decrease in thickness, 0.009 in (0.23 mm) minimum overall, at the base of the boot.
**3M™ Polyurethane Protective Boots are not resistant to Skydrol™ hydraulic fluid. Edge sealing with 3M™ Scotch-Weld™
Epoxy Adhesive DP190 can significantly reduce the effect of Skydrol migrating under edges of boot and tape.