Directions For Use – Heat Activation (continued)
One approach to establishing the correct/optimum bonding conditions for a user’s application is to evaluate a series of
bonding temperatures, for example 93, 107, 121, 135 and 149°C (200, 225, 250, 275 and 300°F). Time and pressure will
be dictated by the thickness of the substrate and the type of substrate being bonded. Thicker substrates and surfaces
that may be more difficult to bond will require longer times, higher pressures and higher temperatures. If voids are
experienced in the bondline, they can be minimized by increasing pressure.
Once the bond is made, the bondline should be allowed to cool somewhat before stress is applied to the bond. Generally,
cooling the bondline below 66°C (150°F) is adequate to allow the bonded parts to be unfixtured/unclamped and handled.
For reference, the following table shows typical bond strengths for bonds made at various temperatures. Such data
can be used to evaluate optimum bondline temperatures. It is important to note that this table is valid only for the
specific substrates shown. Varying temperature, pressure, or substrates can affect bond strengths. User should
develop a similar table with substrates specific to user’s application.
Note: Temperatures shown are bondline temperatures and not heat block or roll settings!
(3)
90° Peel Strengths of Bonds made at Various Temperatures
(2 and 20 sec. Dwell at Bondline Temperature) using 3M™ Thermal Bonding Film 583
Bondline FR-4 / Aluminum CRS / Aluminum
Temperature 2 sec. 20 sec. 2 sec. 20 sec.
24°C (75°F) 9 piw 9 piw 5 piw 6 piw
35°C (95°C) 9 piw 9 piw 6 piw 6 piw
46°C (115°) 9 piw 9 piw 6 piw 6 piw
57°C (135°F) 10 piw 10 piw 6 piw 7 piw
68°C (155°F) 11 piw 11 piw 7 piw 9 piw
79°C (175°F) 12 piw 13 piw 8 piw 10 piw
90°C (195°F) 13 piw 14 piw 9 piw 12 piw
101°C (215°F) 14 piw 14 piw 11 piw 14 piw
113°C (235°F) 14 piw 13 piw 12 piw 13 piw
124°C (255°F) 12 piw 12 piw 13 piw 13 piw
135°C (275°F) 12 piw 12 piw 12 piw 12 piw
146°C (295°F) 12 piw 11 piw 12 piw 12 piw
157°C (315°F) 11 piw 11 piw 11 piw 12 piw
168°C (335°F) 11 piw 11 piw 10 piw 11 piw
179°C (355°F) 11 piw 10 piw 6 piw 9 piw
• Peel values given in piw (pounds per inch width). ASTM D1876.
• Peel bonds were 1/2" wide using 4 mil etched aluminum bonded to either FR-4 printed circuit board substrate (alcohol wiped) or cold rolled steel
(MEK wiped).* Bonds made on Sencorp device using 20 lbs. pressure.
*Note: When using solvents, extinguish all ignition sources and follow the manufacturer’s precautions and directions for use.
3M™ Thermal Bonding Film 583