Scotch-Weld Epoxy Adhesive
2216 B/A
Technical Data February 2018
Product Description 3M Scotch-Weld Epoxy Adhesive 2216 B/A is a flexible, two-part,
room temperature curing epoxy with high peel and shear strength,
available in three versions. 2216 B/A Gray meets DOD-A-82720.
Note: The following technical information and data should be considered
Typical Uncured
representative or typical only and should not be used for specification
Physical
purposes.
Properties
Product 3M Scotch-Weld Epoxy Adhesive
2216 B/A Gray 2216 B/A Tan NS 2216 B/A Translucent
Base Accelerator Base Accelerator Base Accelerator
Color: White Gray White Tan Translucent Amber
Base: Modified Modified Modified Modified Modified Modified
Epoxy Amine Epoxy Amine Epoxy Amine
Net Wt.: (lb/gal) 11.1-11.6 10.5-11.0 11.1-11.6 10.5-11.0 9.4-9.8 8.0-8.5
Viscosity: (cps) (Approx.)
Brookfield RVF 75,000 - 40,000 - 75,000 - 550,000 - 11,000 - 5,000 -
#7 sp. @ 20 rpm 150,000 80,000 150,000 900,000 15,000 9,000
Mix Ratio: (by weight) 5 parts 7 parts 5 parts 7 parts 1 part 1 part
Mix Ratio: (by volume) 2 parts 3 parts 2 parts 3 parts 1 part 1 part
Work Life:
100 g Mass @ 75F (24C) 90 minutes 90 minutes 120 minutes 120 minutes 120 minutes 120 minutes
Features Excellent for bonding many metals, woods, plastics, rubbers, and masonry
products.
Base and Accelerator are contrasting colors.
Good retention of strength after environmental aging.
Resistant to extreme shock, vibration, and flexing.
Excellent for cryogenic bonding applications.
Excellent for potting parts subject to thermal cycling.
The tan NS Adhesive is non-sag for greater bond-line control.
The translucent can be injected.
Meets DOD-A-82720.
3M Scotch-Weld Epoxy Adhesive
2216 B/A
Typical Cured
Product 3M Scotch-Weld Epoxy Adhesive
Physical Properties
2216 Gray 2216 Tan NS 2216 Translucent
Color Gray Tan Translucent
Shore D Hardness 50-65 65-70 35-50
ASTM D 2240
Time to Handling Strength 8-12 hrs. 8-12 hrs. 12-16 hrs.
Typical Cured
Product 3M Scotch-Weld Epoxy Adhesive
Electrical Properties
2216 Gray 2216 Translucent
Arc Resistance 130 seconds
Dielectric Strength 408 volts/mil 630 volts/mil
Dielectric Constant @ 73F (23C) 5.51Measured @ 1.00 KHz 6.3 @ 1 KHz
Dielectric Constant @ 140F (60C) 14.17Measured @ 1.00 KHz
Dissipation Factor 73F (23C) 0.112 Measured @ 1.00 KHz 0.119 @ 1 KHz
Dissipation Factor 140F (60C) 0.422Measured @ 1.00 KHz
16
Surface Resistivity @ 73F (23C) 5.5 x 10 ohm@ 500 volts DC
12 12
Volume Resistivity @ 73F (23C) 1.9 x 10 ohm-cm@ 500 volts DC 3.0 x 10 ohm-cm
@ 500 volts DC
Typical Cured
Product 3M Scotch-Weld Epoxy Adhesive
Thermal Properties
2216 Gray 2216 Translucent
2 2
Thermal Conductivity 0.228 Btu-ft/ ft h F 0.114 Btu-ft/ ft h F
-6 -6
Coefficient of Thermal 102 x 10 in/in/C 81 x 10 in/in/C
Expansion between 0-40C between -50-0C
-6 -6
134 x 10 in/in/C 207 x 10 in/in/C
between 40-80C between 60-150C
Typical Cured Outgassing Data
Outgassing Properties
NASA 1124 Revision 4
% TML % CVCM % Wtr
3 M Scotch-W eld Epoxy Adhesive 2216 Gray .77 .04 .23
Cured in air for 7 days @ 77F (25C).
Handling/Curing Directions for Use
Information
1. For high strength structural bonds, paint, oxide films, oils, dust, mold
release agents and all other surface contaminants must be completely
removed. However, the amount of surface preparation directly depends
on the required bond strength and the environmental aging resistance
desired by user. For suggested surface preparations of common
substrates, see the following section on surface preparation.
2. These products consist of two parts. Mix thoroughly by weight or
volume in the proportions specified on the product label and in the
uncured properties section. Mix approximately 15 seconds after a
uniform color is obtained.
- 2 -