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Description for 3M 3748 VO
A tough, flexible, thermoplastic hot melt, 100% solids adhesive which exhibits good peel adhesion and thermal shock properties along with higher heat resistance.Chemical Resistance 1, 1, 1 - trichloroethylene, Acetone, Freon® TF, Freon® TMC, Isopropyl Alcohol, RMA Flux Application Type Bond, Potting, Sealing 1 Part or 2 Part 1 Part Material Form Sticks Substrate Aluminum, Ceramic, FRP, Glass, Metal, ABS, Polycarbonate, Polypropylene, Douglas Fir , Phenolic, Polyethylene, Epoxy, FR-4, Fir Industry Other electronic bonding applications, Printed wiring board Manufacturer 3M Chemistry Hot melt: Polyolefin, Thermoplastic Cure Method Hot melt Viscosity (cPs) 8,500, 5,000, 3,300 Color Light Yellow High Temperature Resistance (°C) Exhibits good thermal shock properties Durability Tough Key Specifications UL (Underwriters Laboratory), ULC (Underwriters Laboratories of Canada), NFPA (National Fire Protection Association): UL 94: UL 94 (Flammability classification): V-O -
Best Practices for 3M 3748 VO
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Comparable Materials for 3M 3748 VO
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Softening Point Test Methods
Softening Point | Unit Test Method |
---|---|
152°C | Ball and Ring Softening Point, The technical information and data should be considered representative or typical only and should not be used for specification purposes. |
Viscosity Test Methods
Viscosity | Test Method | Temperature |
---|---|---|
8,500 cPs | The technical information and data should be considered representative or typical only and should not be used for specification purposes. | 180°C |
5,000 cPs | 200°C | |
3,300 cPs | 220°C |
Work / Pot Time Test Methods
Work / Pot Time | Test Method |
---|---|
0.50 min | 1/8" semicircular bead, Douglas Fir to Douglas Fir. |
Peel Strength Test Methods
Peel Strength | Type | Cure Time | Cure Temperature | Substrate | Test Method |
---|---|---|---|---|---|
Exhibits good peel adhesion | 180° Peel Adhesion | ||||
38 piw | 180° Peel Adhesion | 1,440 min | 21°C | Wire Mesh to FR-4 | 1" x 4" Douglas Fir specimens are bonded with hot melt adhesive using a 1" overlap shear configuration. Bonds are then conditioned for 24 hours at 70°F (22°C), 50% relative humidity before testing. Bonds are subjected to 2 lbs. per square inch load at 100°F (49°C) for 30 minutes. Temperature of the bond line is raised every 30 minutes until failure. Heat resistance recorded is the last temperature prior to bond failure. |
35 piw | 180° Peel Adhesion | 1,440 min | 21°C | Wire Mesh to PP | 1" x 4" Douglas Fir specimens are bonded with hot melt adhesive using a 1" overlap shear configuration. Bonds are then conditioned for 24 hours at 70°F (22°C), 50% relative humidity before testing. Bonds are subjected to 2 lbs. per square inch load at 100°F (49°C) for 30 minutes. Temperature of the bond line is raised every 30 minutes until failure. Heat resistance recorded is the last temperature prior to bond failure. |
27 piw | 180° Peel Adhesion | 1,440 min | 21°C | Wire Mesh to PE | 1" x 4" Douglas Fir specimens are bonded with hot melt adhesive using a 1" overlap shear configuration. Bonds are then conditioned for 24 hours at 70°F (22°C), 50% relative humidity before testing. Bonds are subjected to 2 lbs. per square inch load at 100°F (49°C) for 30 minutes. Temperature of the bond line is raised every 30 minutes until failure. Heat resistance recorded is the last temperature prior to bond failure. |
26 piw | 180° Peel Adhesion | 1,440 min | 21°C | Wire Mesh to Fir | 1" x 4" Douglas Fir specimens are bonded with hot melt adhesive using a 1" overlap shear configuration. Bonds are then conditioned for 24 hours at 70°F (22°C), 50% relative humidity before testing. Bonds are subjected to 2 lbs. per square inch load at 100°F (49°C) for 30 minutes. Temperature of the bond line is raised every 30 minutes until failure. Heat resistance recorded is the last temperature prior to bond failure. |
Shear Strength Test Methods
Shear Strength | Type | Cure Time | Cure Temperature | Substrate | Test Method |
---|---|---|---|---|---|
215 psi | Overlap shear strength | 1,440 min | 70°C | FR-4 to FR-4 | 1" x 4" Douglas Fir specimens are bonded with hot melt adhesive using a 1" overlap and 13 mil wire spacer to set bond line thickness. Bonds are then conditioned for 24 hours at 70°F (22°C), 50% relative humidity before testing. Bonds are pulled in shear at a separation bond speed of 2 inch a minute recording strength at failure. |
275 psi | Overlap shear strength | 1,440 min | 70°C | Fir to Fir | 1" x 4" Douglas Fir specimens are bonded with hot melt adhesive using a 1" overlap and 13 mil wire spacer to set bond line thickness. Bonds are then conditioned for 24 hours at 70°F (22°C), 50% relative humidity before testing. Bonds are pulled in shear at a separation bond speed of 2 inch a minute recording strength at failure. |
250 psi | Overlap shear strength | 1,440 min | 70°C | Polypropylene to Polypropylene | 1" x 4" Douglas Fir specimens are bonded with hot melt adhesive using a 1" overlap and 13 mil wire spacer to set bond line thickness. Bonds are then conditioned for 24 hours at 70°F (22°C), 50% relative humidity before testing. Bonds are pulled in shear at a separation bond speed of 2 inch a minute recording strength at failure. |
220 psi | Overlap shear strength | 1,440 min | 70°C | Polyethylene to Polyethylene | 1" x 4" Douglas Fir specimens are bonded with hot melt adhesive using a 1" overlap and 13 mil wire spacer to set bond line thickness. Bonds are then conditioned for 24 hours at 70°F (22°C), 50% relative humidity before testing. Bonds are pulled in shear at a separation bond speed of 2 inch a minute recording strength at failure. |
High Temperature Resistance Test Methods
High Temperature Resistance | Test Method |
---|---|
Exhibits good thermal shock properties |
Dielectric Constant Test Methods
Dielectric Constant | Test Method |
---|---|
2.30 | ASTM D 150, 100 Hz |
2.30 | ASTM D 150, 1 kHz |
2.30 | ASTM D 150, 10 kHz |
2.30 | ASTM D 150, 100 kHz |
2.30 | ASTM D 150, 1 MHz |
2.30 | ASTM D 150, 100 MHz |
Dielectric Strength Test Methods
Dielectric Strength | Test Method |
---|---|
Good | |
1,400 V/mil | ASTM D 149, 11 mil sample, The technical information and data should be considered representative or typical only and should not be used for specification purposes. |
Excellent electrical properties | ASTM D 149, 11 mil sample, The technical information and data should be considered representative or typical only and should not be used for specification purposes. |
Dissipation Factor Test Methods
Dissipation Factor | Test Method |
---|---|
0.00200 | ASTM D 150, 100 Hz, The following technical information and data should be considered representative or typical only and should not be used for specification purposes. |
0.00100 | ASTM D 150, 1 kHz, The following technical information and data should be considered representative or typical only and should not be used for specification purposes. |
0.00100 | ASTM D 150, 10 kHz, The following technical information and data should be considered representative or typical only and should not be used for specification purposes. |
0.00100 | ASTM D 150, 100 kHz, The following technical information and data should be considered representative or typical only and should not be used for specification purposes. |
0.00100 | ASTM D 150, 1 MHz, The following technical information and data should be considered representative or typical only and should not be used for specification purposes. |
0.00100 | ASTM D 150, 100 MHz, The following technical information and data should be considered representative or typical only and should not be used for specification purposes. |
Surface Resistivity Test Methods
Surface Resistivity | Test Method |
---|---|
4.5e17 (ohms/sq.) | ASTM D 257, The following technical information and data should be considered representative or typical only and should not be used for specification purposes. |
Thermal Conductivity Test Methods
Thermal Conductivity | Temperature | Test Method |
---|---|---|
1.92e-1 (Watt/m - °C) | 41°C | @ 41°C [107°F] on .020" samples. |
Volume Resistivity Test Methods
Volume Resistivity | Test Method |
---|---|
6.0e17 (ohm/cm) | ASTM D 257, The technical information and data should be considered representative or typical only and should not be used for specification purposes. |
Shore D Hardness Test Methods
Shore D Hardness | Shore Hardness Test Method |
---|---|
26 | ASTM D 2240, The technical information and data should be considered representative or typical only and should not be used for specification purposes. |
Coefficient of Thermal Expansion (CTE) Test Methods
Coefficient of Thermal Expansion (CTE) | CTE Temperature (°C) | CTE Test Method |
---|---|---|
-34.0e-6 (units/units/°C) | -100 to -40°C | By TMA, The technical information and data should be considered representative or typical only and should not be used for specification purposes. |
154.5e-6 (units/units/°C) | -20 to 25°C | By TMA, The technical information and data should be considered representative or typical only and should not be used for specification purposes. |
Specific Gravity Test Methods
Specific Gravity | Test Method |
---|---|
1.090 | The technical information and data should be considered representative or typical only and should not be used for specification purposes. |