• Description for 3M 3748 VO

    A tough, flexible, thermoplastic hot melt. Self-extinguishing, meets UL 1410 requirements.

    *See Terms of Use Below

    Application Type Bond, Pottant / Encapsulant, Sealing, Fixture
    1 Part or 2 Part 1 Part
    Material Form Sticks
    Substrate Aluminum, Ceramic, Epoxy, Phenolic, Glass, Metal, ABS, Polyethylene, Polycarbonate, Polypropylene, Douglas Fir , FRP, Polyolefin, ThermoPlastic
    Industry Electrical, Printed circuit boards (PCBs), Instruments, Printed wiring Board
    Manufacturer 3M
    Chemistry Hot melt, Polyolefin
    Cure Method Hot melt
    Viscosity (cPs) 8,500, 5,000, 3,300, 5,500
    Color Light Yellow
    Chemical Resistance 1, 1, 1 - trichloroethylene, Acetone, Freon® TF, Freon® TMC, Isopropyl Alcohol, RMA Flux
    High Temperature Resistance (°C) 52, 25, High, 79, Good thermal shock resistance
    Low Temperature Resistance (°C) -100, -20, -40
    Durability Tough
    Key Specifications UL94 - VO; UL 1410, Mil-Spec (United States Military Standard): Mil S-46163
  • Technical Data for 3M 3748 VO

    Overview
    • Application Type
    • 1 Part or 2 Part
      • 1 Part or 2 Part - 1 Part
    • Material Form
      • Stick - Sticks
    • Substrate
    • Industry
      • Electronics - Electrical, Instruments, Printed wiring Board
      • Printed Circuit Board (PCB) - Printed circuit boards (PCBs)
      • Industrial - Many general industrial bonding
    • Chemistry
    • Application Method
      • Dispenser - Lamination equipment
    • Cure Method
      • Hotmelt - Hot melt
    • Color
      • Yellow - Light Yellow
    • Key Specifications
      • UL (Underwriters Laboratory), ULC (Underwriters Laboratories of Canada), NFPA (National Fire Protection Association) - UL94 - VO; UL 1410
      • Mil-Spec (United States Military Standard): S-46163 - Mil S-46163
    Specifications
    Cure Specs
    Application Temperature (°F) 351 to 385
    Viscosity (cPs) 8,500, 5,000, 3,300, 5,500 Test Method
    Softening Point (°C) 152 Test Method
    Work / Pot Time (min) 0.50 Test Method
    Thixotropic High
    Bond Strength
    General Bond Strength (psi) Excellent adhesion
    Peel Strength (piw) 15, Good, 38, 35, 27, 26 Test Method
    Shear Strength (psi) 275, 215, 275, 250, 220 Test Method
    Tensile Strength (psi) 200 Test Method
    Material Resistance
    Chemical Resistance 1, 1, 1 - trichloroethylene, Acetone, Freon® TF, Freon® TMC, Isopropyl Alcohol, RMA Flux
    High Temperature Resistance (°C) 52, 25, High, 79, Good thermal shock resistance Test Method
    Low Temperature Resistance (°C) -100, -20, -40
    Conductivity
    Dissipation Factor 0.00200, 0.00100, 0.00100, 0.00100, 0.00100, 0.00100 Test Method
    Dielectric Strength (V/mil) Excellent, Good, 1,400 Test Method
    Dielectric Constant 2.30, 2.30, 2.30, 2.30, 2.30, 2.30 Test Method
    Thermal Conductivity (W/m°K) 1.92e-1 (Watt/m - °C) Test Method
    Surface Resistivity (O) 4.5e17 (ohms/sq.) Test Method
    Volume Resistivity (O) 6.0e17 (ohms/cm) Test Method
    Hardness
    Durability Tough
    Shore D Hardness 26 Test Method
    Elongation (%) 1,850
    Flexibility Flexible
    Other Properties
    Specific Gravity 1.090
    Coefficient of Thermal Expansion (CTE) -34.0e-6 (unit/unit /°C), 154.5e-6 (unit/unit /°C) Test Method
    Flash Point (°F) 536.0
    % Solids (%) 100
    Business Information
    Shelf Life Details Store below 120°F (49°C). When stored at the recommended conditions, this product has a shelf life of 2 years from the date of manufacture.
    Shelf Life Temperature (°F) <120
    Shelf Life Type from the date of manufacture
    Shelf Life (mon) 24
  • Best Practices for 3M 3748 VO

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Softening Point Test Methods
Softening Point Unit Test Method
152°C ASTM E-28-99
Viscosity Test Methods
Viscosity Test Method Temperature
8,500 cPs 180°C
5,000 cPs 200°C
3,300 cPs 220°C
5,500 cPs Brookfield Thermosel Viscometer in Centipoise. 191°C
Work / Pot Time Test Methods
Work / Pot Time Test Method
0.50 min 1/8" semicircular bead, Douglas Fir to Douglas Fir.
Shear Strength Test Methods
Shear Strength Type Cure Time Cure Temperature Cure Humidity Substrate Test Temperature Test Method
275 psi 22°C On Douglas Fir 22°C
215 psi Overlap shear strength 1,440 min 22°C 50 % FR-4 to FR-4 21°C 3M TM C 3096, 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 22°C 50 % Fir to Fir 21°C 3M TM C 3096, 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 22°C 50 % Polypropylene to Polypropylene 21°C 3M TM C 3096, 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 22°C 50 % Polyethylene to Polyethylene 21°C 3M TM C 3096, 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.
Tensile Strength Test Methods
Tensile Strength Test Temperature
200 psi 22°C
Peel Strength Test Methods
Peel Strength Type Substrate Test Temperature Test Method
15 piw On canvas 22°C
Good
38 piw 180° Peel strength Wire Mesh to FR-4 C 3168, 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 strength Wire Mesh to PP C 3168, 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 strength Wire Mesh to PE C 3168, 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 strength Wire Mesh to Fir C 3168, 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.
High Temperature Resistance Test Methods
High Temperature Resistance Test Method
52°C
25°C
High
79°C Temperature at which adhesive fails
Good thermal shock resistance
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
Excellent
Good
1,400 V/mil ASTM D 149, 11 mil sample
Dissipation Factor Test Methods
Dissipation Factor Test Method
0.00200 ASTM D 150, 100 Hz
0.00100 ASTM D 150, 1 kHz
0.00100 ASTM D 150, 10 kHz
0.00100 ASTM D 150, 100 kHz
0.00100 ASTM D 150, 1 MHz
0.00100 ASTM D 150, 100 MHz
Surface Resistivity Test Methods
Surface Resistivity Test Method
4.5e17 (ohms/sq.) ASTM D 257
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 (ohms/cm) ASTM D 257
Shore D Hardness Test Methods
Shore D Hardness Shore Hardness Test Method
26 ASTM D 2240
Coefficient of Thermal Expansion (CTE) Test Methods
Coefficient of Thermal Expansion (CTE) CTE Temperature (°C) CTE Test Method
-34.0e-6 (unit/unit /°C) -100 to -40°C by TMA
154.5e-6 (unit/unit /°C) -20 to 25°C by TMA
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