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Description for 3M Thermal Bonding Film AF42 (4 mil)
It is a thermosetting epoxy film adhesive, Its flexibility provides excellent drop and impact resistance as well as stress relief for joints encountering coefficient of thermal expansion (CTE) mismatch, Structural bond strength to metals and glass.Chemical Resistance Chemical Resistance: Fluid Resistance: Tap Water resistance, Excellent chemical resistance, Ethyl Gasoline, Isopropyl Alcohol, Methyl Ethyl Ketone, Heptane, 3M™ Citrus Base Cleaner Application Type Bond 1 Part or 2 Part 1 Part Material Form Film Substrate Aluminum, Copper, Glass, Metal, Steel, Stainless Steel (solvent wiped), Polyester Film, Polyimide Film, Phenolic Board, PEN Plastic, Phenolic Board, Etched aluminum, CRS (cold rolled steel), Al (sanded), CRS (scour pad abraded, solvent wiped), Al (scour pad abraded), Al (solvent wiped), FPL Etched Aluminum Industry Electronics Manufacturer 3M Chemistry Epoxy, Low halogen content Cure Method Heat cure Cure Temperature (°C) 177, 204, 232 Cure Time (min) 60, 15, 10 Viscosity (cPs) Low flow Color Translucent Total Thickness (mm) 0.102 Arc Resistance (sec) Arc Resistance High Temperature Resistance (°C) 121 Low Temperature Resistance (°C) -55 Other Resistance Excellent Drop resistance Durability Tough Stress Relief Stress relief Key Specifications Mil-Spec (United States Military Standard): MIL-A-5090D or ASTM D 1002).
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Work / Pot Time Test Methods
Work / Pot Time | Test Method | Temperature |
---|---|---|
40,320 min | Work life is defined as the time the product can be at room temperature, and will yield the performance data summarized in this data sheet if bonds are made and tested per instructions. | 25°C |
Shear Strength Test Methods
Shear Strength | Type | Cure Time | Cure Temperature | Substrate | Test Time | Test Temperature | Test Method |
---|---|---|---|---|---|---|---|
4,600 psi | Overlap shear strength | 60 min | 121°C | Al (etched) | ASTM D1002., OLS bonds were 1" x 0.5" and tested at 0.2"/minute., Bonds were cured 60 minutes (+ 7 minutes ramp time) at 250°F (121°C). | ||
3,700 psi | Overlap shear strength | 60 min | 121°C | Al (sanded, solvent wiped) | ASTM D1002., OLS bonds were 1" x 0.5" and tested at 0.2"/minute., Bonds were cured 60 minutes (+ 7 minutes ramp time) at 250°F (121°C). | ||
3,750 psi | Overlap shear strength | 60 min | 121°C | Al (scour pad abraded, solvent wiped) | ASTM D1002., OLS bonds were 1" x 0.5" and tested at 0.2"/minute., Bonds were cured 60 minutes (+ 7 minutes ramp time) at 250°F (121°C). | ||
500 psi | Overlap shear strength | 60 min | 121°C | Al (solvent wiped) | ASTM D1002., OLS bonds were 1" x 0.5" and tested at 0.2"/minute., Bonds were cured 60 minutes (+ 7 minutes ramp time) at 250°F (121°C). | ||
1,350 psi | Overlap shear strength | 60 min | 121°C | CRS (scour pad abraded, solvent wiped) | ASTM D1002., OLS bonds were 1" x 0.5" and tested at 0.2"/minute., Bonds were cured 60 minutes (+ 7 minutes ramp time) at 250°F (121°C). | ||
600 psi | Overlap shear strength | 60 min | 121°C | Stainless Steel (solvent wiped) | ASTM D1002., OLS bonds were 1" x 0.5" and tested at 0.2"/minute., Bonds were cured 60 minutes (+ 7 minutes ramp time) at 250°F (121°C). | ||
2,500 psi | Overlap shear strength | 60 min | 121°C | FR-4 (solvent wiped) | ASTM D1002., OLS bonds were 1" x 0.5" and tested at 0.2"/minute., Bonds were cured 60 minutes (+ 7 minutes ramp time) at 250°F (121°C). | ||
400 psi | Overlap shear strength | 60 min | 121°C | LCP (solvent wiped) | ASTM D1002., OLS bonds were 1" x 0.5" and tested at 0.2"/minute., Bonds were cured 60 minutes (+ 7 minutes ramp time) at 250°F (121°C). | ||
650 psi | Overlap shear strength | 60 min | 121°C | Polyimide Film | ASTM D1002., OLS bonds were 1" x 0.5" and tested at 0.2"/minute., Bonds were cured 60 minutes (+ 7 minutes ramp time) at 250°F (121°C). | ||
350 psi | Overlap shear strength | 60 min | 121°C | Polyester Film | ASTM D1002., OLS bonds were 1" x 0.5" and tested at 0.2"/minute., Bonds were cured 60 minutes (+ 7 minutes ramp time) at 250°F (121°C). | ||
350 psi | Overlap shear strength | 60 min | 121°C | Black E-coat | ASTM D1002., OLS bonds were 1" x 0.5" and tested at 0.2"/minute., Bonds were cured 60 minutes (+ 7 minutes ramp time) at 250°F (121°C). | ||
1,000 psi | Overlap shear strength | 60 min | 121°C | Phenolic Board | ASTM D1002., OLS bonds were 1" x 0.5" and tested at 0.2"/minute., Bonds were cured 60 minutes (+ 7 minutes ramp time) at 250°F (121°C). | ||
1,500 psi | Overlap shear strength | 60 min | 121°C | Ultem® 1000 | ASTM D1002., OLS bonds were 1" x 0.5" and tested at 0.2"/minute., Bonds were cured 60 minutes (+ 7 minutes ramp time) at 250°F (121°C). | ||
250 psi | Overlap shear strength | 60 min | 121°C | PEN Plastic | ASTM D1002., OLS bonds were 1" x 0.5" and tested at 0.2"/minute., Bonds were cured 60 minutes (+ 7 minutes ramp time) at 250°F (121°C). | ||
1,200 psi | Overlap shear strength | 60 min | 121°C | CRS to CRS | 2,592,000 sec | 20 to 25°C | (control), OLS (overlap shear) bonds consisted of 3M™ Scotch-Brite™ Scour Pad (green) abraded CRS to CRS, cured 60 minutes + 7 minutes (ramp time) at 121°C (250°F) and tested at 0.2"/minute speed. |
1,450 psi | Overlap shear strength | 60 min | 121°C | CRS to CRS | 2,592,000 sec | 71°C | Oven, OLS (overlap shear) bonds consisted of 3M™ Scotch-Brite™ Scour Pad (green) abraded CRS to CRS, cured 60 minutes + 7 minutes (ramp time) at 121°C (250°F) and tested at 0.2"/minute speed. |
200 psi | Overlap shear strength | 60 min | 121°C | CRS to CRS | 2,592,000 sec | 49°C | 100% RH, OLS (overlap shear) bonds consisted of 3M™ Scotch-Brite™ Scour Pad (green) abraded CRS to CRS, cured 60 minutes + 7 minutes (ramp time) at 121°C (250°F) and tested at 0.2"/minute speed. |
300 psi | Overlap shear strength | 60 min | 121°C | CRS to CRS | 2,592,000 sec | immersion in distilled water, OLS (overlap shear) bonds consisted of 3M™ Scotch-Brite™ Scour Pad (green) abraded CRS to CRS, cured 60 minutes + 7 minutes (ramp time) at 121°C (250°F) and tested at 0.2"/minute speed. | |
900 psi | Overlap shear strength | 60 min | 121°C | CRS to CRS | 61,200 sec | 49°C | OLS (overlap shear) bonds consisted of 3M™ Scotch-Brite™ Scour Pad (green) abraded CRS to CRS, cured 60 minutes + 7 minutes (ramp time) at 121°C (250°F) and tested at 0.2"/minute speed., Hot/cold cycle was 17 hours at 49°C (120°F) and 5 hours at -21°C (-5°F) with one hour at room temperature between temperature changes. |
1,500 psi | Overlap shear strength | CRS | -55°C | OLS bonds were 0.5" x 1" (CRS, 3M™ Scotch-Brite™ Scour Pad [green] abraded, solvent wiped)., tested in similar fashion described in previous sections. | |||
1,300 psi | Overlap shear strength | CRS | 24°C | OLS bonds were 0.5" x 1" (CRS, 3M™ Scotch-Brite™ Scour Pad [green] abraded, solvent wiped)., tested in similar fashion described in previous sections. | |||
350 psi | Overlap shear strength | CRS | 82°C | OLS bonds were 0.5" x 1" (CRS, 3M™ Scotch-Brite™ Scour Pad [green] abraded, solvent wiped)., tested in similar fashion described in previous sections. | |||
175 psi | Overlap shear strength | 121°C | OLS bonds were 0.5" x 1" (CRS, 3M™ Scotch-Brite™ Scour Pad [green] abraded, solvent wiped)., tested in similar fashion described in previous sections. | ||||
33 (Mpa) | Overlap Shear Strength | CRS | 60 min + 10 min, ramp time | 180°C | ASTM D1002,Samples cured for 60 min + 10 min ramp time at 180°C. |
Tensile Strength Test Methods
Tensile Strength | Type | Substrate | Test Time | Test Temperature | Test Method |
---|---|---|---|---|---|
4,800 psi | |||||
1.9 (J) | Tensile Impact Resistance | FPL Etched Aluminum | 60 min | 65°C | Deviation in specimen geometry. Gauge length 20 mm, width 3 mm. Samples degassed (-90 KPa, 1 hour, 65°C). |
59 (Mpa) | Ultimate Tensile Strength | 60 min | 65°C | ASTM D638d |
Peel Strength Test Methods
Peel Strength | Type | Cure Time | Cure Temperature | Substrate | Test Time | Test Temperature | Test Method |
---|---|---|---|---|---|---|---|
High | |||||||
55 piw | 90° Peel strength | 60 min | 121°C | Al (etched) | 90° peel test of 1/2" wide, 4 mil thick etched aluminum foil bonded to each test substrate., Peel rate 2”/minute., ASTM D1876., Bonds were cured 60 minutes (+ 7 minutes ramp time) at 250°F (121°C). | ||
48 piw | 90° Peel strength | 60 min | 121°C | Al (sanded, solvent wiped) | 90° peel test of 1/2" wide, 4 mil thick etched aluminum foil bonded to each test substrate., Peel rate 2”/minute., ASTM D1876., Bonds were cured 60 minutes (+ 7 minutes ramp time) at 250°F (121°C). | ||
45 piw | 90° Peel strength | 60 min | 121°C | Al (scour pad abraded, solvent wiped) | 90° peel test of 1/2" wide, 4 mil thick etched aluminum foil bonded to each test substrate., Peel rate 2”/minute., ASTM D1876., Bonds were cured 60 minutes (+ 7 minutes ramp time) at 250°F (121°C). | ||
52 piw | 90° Peel strength | 60 min | 121°C | Al (solvent wiped) | 90° peel test of 1/2" wide, 4 mil thick etched aluminum foil bonded to each test substrate., Peel rate 2”/minute., ASTM D1876., Bonds were cured 60 minutes (+ 7 minutes ramp time) at 250°F (121°C). | ||
58 piw | 90° Peel strength | 60 min | 121°C | CRS (scour pad abraded, solvent wiped) | 90° peel test of 1/2" wide, 4 mil thick etched aluminum foil bonded to each test substrate., Peel rate 2”/minute., ASTM D1876., Bonds were cured 60 minutes (+ 7 minutes ramp time) at 250°F (121°C). | ||
11 piw | 90° Peel strength | 60 min | 121°C | Stainless Steel (solvent wiped) | 90° peel test of 1/2" wide, 4 mil thick etched aluminum foil bonded to each test substrate., Peel rate 2”/minute., ASTM D1876., Bonds were cured 60 minutes (+ 7 minutes ramp time) at 250°F (121°C). | ||
58 piw | 90° Peel strength | 60 min | 121°C | FR-4 (solvent wiped) | 90° peel test of 1/2" wide, 4 mil thick etched aluminum foil bonded to each test substrate., Peel rate 2”/minute., ASTM D1876., Bonds were cured 60 minutes (+ 7 minutes ramp time) at 250°F (121°C). | ||
1 piw | 90° Peel strength | 60 min | 121°C | LCP (solvent wiped) | 90° peel test of 1/2" wide, 4 mil thick etched aluminum foil bonded to each test substrate., Peel rate 2”/minute., ASTM D1876., Bonds were cured 60 minutes (+ 7 minutes ramp time) at 250°F (121°C). | ||
8 piw | 90° Peel strength | 60 min | 121°C | Polyimide Film | 90° peel test of 1/2" wide, 4 mil thick etched aluminum foil bonded to each test substrate., Peel rate 2”/minute., ASTM D1876., Bonds were cured 60 minutes (+ 7 minutes ramp time) at 250°F (121°C). | ||
3 piw | 90° Peel strength | 60 min | 121°C | Polyester Film | 90° peel test of 1/2" wide, 4 mil thick etched aluminum foil bonded to each test substrate., Peel rate 2”/minute., ASTM D1876., Bonds were cured 60 minutes (+ 7 minutes ramp time) at 250°F (121°C). | ||
49 piw | 90° Peel strength | 60 min | 121°C | Black E-coat | 90° peel test of 1/2" wide, 4 mil thick etched aluminum foil bonded to each test substrate., Peel rate 2”/minute., ASTM D1876., Bonds were cured 60 minutes (+ 7 minutes ramp time) at 250°F (121°C). | ||
36 piw | 90° Peel strength | 60 min | 121°C | Phenolic Board | 90° peel test of 1/2" wide, 4 mil thick etched aluminum foil bonded to each test substrate., Peel rate 2”/minute., ASTM D1876., Bonds were cured 60 minutes (+ 7 minutes ramp time) at 250°F (121°C). | ||
50 piw | 90° Peel strength | 60 min | 121°C | Ultem® 1000 | 90° peel test of 1/2" wide, 4 mil thick etched aluminum foil bonded to each test substrate., Peel rate 2”/minute., ASTM D1876., Bonds were cured 60 minutes (+ 7 minutes ramp time) at 250°F (121°C). | ||
14 piw | 90° Peel strength | 60 min | 121°C | PEN Plastic | 90° peel test of 1/2" wide, 4 mil thick etched aluminum foil bonded to each test substrate., Peel rate 2”/minute., ASTM D1876., Bonds were cured 60 minutes (+ 7 minutes ramp time) at 250°F (121°C). | ||
60 piw | 90° Peel strength | 60 min | 121°C | Borosilicate Glass | 90° peel test of 1/2" wide, 4 mil thick etched aluminum foil bonded to each test substrate., Peel rate 2”/minute., ASTM D1876., Bonds were cured 60 minutes (+ 7 minutes ramp time) at 250°F (121°C). | ||
63 piw | 60 min | 121°C | Etched aluminum | 43,200 min | 20 to 25°C | (control) Peel bonds consisted of 10 mil etched aluminum strips bonded to 0.047" FR-4. Panels were cured 60 minutes + 7 minutes (ramp time) at 121°C (250°F) and peeled at 2"/minute speed. | |
68 piw | 60 min | 121°C | Etched aluminum | 43,200 min | 71°C | Oven, Peel bonds consisted of 10 mil etched aluminum strips bonded to 0.047" FR-4. Panels were cured 60 minutes + 7 minutes (ramp time) at 121°C (250°F) and peeled at 2"/minute speed. | |
58 piw | 60 min | 121°C | Etched aluminum | 43,200 min | 49°C | 100% RH, Peel bonds consisted of 10 mil etched aluminum strips bonded to 0.047" FR-4. Panels were cured 60 minutes + 7 minutes (ramp time) at 121°C (250°F) and peeled at 2"/minute speed. | |
55 piw | 60 min | 121°C | Etched aluminum | 43,200 min | immersion in distilled water, Peel bonds consisted of 10 mil etched aluminum strips bonded to 0.047" FR-4. Panels were cured 60 minutes + 7 minutes (ramp time) at 121°C (250°F) and peeled at 2"/minute speed. | ||
63 piw | Etched aluminum | 1,020 min | 49°C | Peel bonds consisted of 10 mil etched aluminum strips bonded to 0.047" FR-4. Panels were cured 60 minutes + 7 minutes (ramp time) at 121°C (250°F) and peeled at 2"/minute speed., Hot/cold cycle was 17 hours at 49°C (120°F) and 5 hours at -21°C (-5°F) with one hour at room temperature between temperature changes. | |||
66 piw | Etched aluminum | -55°C | Peel bonds were 0.5" wide, 10 mil etched aluminum strips bonded to 0.047" FR-4 board., tested in similar fashion described in previous sections. | ||||
56 piw | Etched aluminum | 24°C | Peel bonds were 0.5" wide, 10 mil etched aluminum strips bonded to 0.047" FR-4 board., tested in similar fashion described in previous sections. | ||||
54 piw | Etched aluminum | 82°C | Peel bonds were 0.5" wide, 10 mil etched aluminum strips bonded to 0.047" FR-4 board., tested in similar fashion described in previous sections. | ||||
36 piw | Etched aluminum | 121°C | Peel bonds were 0.5" wide, 10 mil etched aluminum strips bonded to 0.047" FR-4 board., tested in similar fashion described in previous sections. | ||||
51 piw | T-Peel | FPL Etched Aluminum | ASTM D1876 |
Cleavage Strength Test Methods
Cleavage Strength | Test Temperature | Test Method |
---|---|---|
High | -40°C | ASTM D1205 |
1,300 psi | 24°C | ASTM D1205 |
720 psi | 93°C | ASTM D1205 |
400 psi |
Dielectric Constant Test Methods
Dielectric Constant | Test Method |
---|---|
4.60 | ASTM D-150, 1 kilohertz |
4.20 | ASTM D-150, 10 kilohertz |
3.80 | ASTM D-150, 100 kilohertz |
Dielectric Strength Test Methods
Dielectric Strength | Test Method |
---|---|
900 V/mil | ASTM D149, Breakdown |
Dissipation Factor Test Methods
Dissipation Factor | Test Method |
---|---|
0.00400 | ASTM D-150, 1 kilohertz |
0.00600 | ASTM D-150, 10 kilohertz |
0.00800 | ASTM D-150, 100 kilohertz |
Surface Resistivity Test Methods
Surface Resistivity | Test Method |
---|---|
4.1e13 (ohm/square) | 500 (Volts - DC) |
Thermal Conductivity Test Methods
Thermal Conductivity | Test Method |
---|---|
0.21 W/m°K | ASTM C177 |
Volume Resistivity Test Methods
Volume Resistivity | Test Method |
---|---|
1.2e15 (ohm/cm) | ASTM D-257 (3 mil) |
Elongation Test Methods
Elongation | Test Method |
---|---|
350 % | Deviation in specimen geometry. Gauge length 20 mm, width 3 mm. Samples degassed (-90 KPa, 1 hour, 65°C). |
Shore D Hardness Test Methods
Shore D Hardness | Shore Hardness Test Method |
---|---|
76 | ASTM D2240 |
Modulus Test Methods
Modulus | Test Method |
---|---|
100 ( MPa) | Deviation in specimen geometry. Gauge length 20 mm, width 3 mm. Samples degassed (-90 KPa, 1 hour, 65°C). |
Coefficient of Thermal Expansion (CTE) Test Methods
Coefficient of Thermal Expansion (CTE) | CTE Temperature (°C) | CTE Test Method |
---|---|---|
63e-6 (units / unit /°C @ 10°C/min.) | -60 to 40°C | by TMA, 1st heat values |
13e-6 (units / unit /°C @ 10°C/min.) | -60 to 40°C | by TMA, 2nd heat values |
266e-6 (units / unit /°C @ 10°C/min.) | 65 to 125°C | by TMA, 2nd heat values |
Glass Transition Temp (Tg) Test Methods
Glass Transition Temp (Tg) | Glass Transition Temperature (Tg) Test Method |
---|---|
55°C | By TMA @ 10°C/min., onset, 2nd heat values |
50°C | DSC @ 5°C/min., midpoint, 1st heat values |
45°C | DSC @ 5°C/min., midpoint, 2nd heat values |

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