Brand: 3M™
Product Number: 3748 VO
Technologies: Hot Melt Adhesive
Color: Light Yellow
Cure Type: Thermoplastic (Hot Melt)
Package Sizes:
Shelf Life: 24 months
3M™ Self-Extinguishing Hot Melt Adhesive 3748 VO is a tough, flexible, thermoplastic hot melt adhesive that provides excellent peel adhesion, thermal shock resistance, and high heat resistance. It features outstanding electrical properties, making it ideal for printed wiring board and other electronic bonding applications. This adhesive is self-extinguishing, meeting UL 94 VO standards, making it suitable for industrial applications where flame resistance is required.
| Attribute Name | Value |
|---|---|
| Color | Light Yellow¹ |
| Base Resin | Polyolefin |
| Specific Gravity | 1.09 |
| Ball & Ring Softening Point | 152°C (305°F) |
| Viscosity at 180°C (356°F) | 8,500 cP |
| Viscosity at 200°C (392°F) | 5,000 cP |
| Viscosity at 23°C (73°F) | 3,300 cP |
¹ Color may vary from nearly white to yellow/amber but does not affect adhesive performance.
| Attribute Name | Test Method | Value |
|---|---|---|
| Shore D Hardness | ASTM D2240 | 26 |
| Attribute Name | Test Method | Substrate | Value |
|---|---|---|---|
| 180° Peel Adhesion | 3M C3168 | Wire Mesh to Fir | 416 oz/in |
| 180° Peel Adhesion | 3M C3168 | Wire Mesh to FR-4 | 608 oz/in |
| 180° Peel Adhesion | 3M C3168 | Wire Mesh to Polyethylene | 432 oz/in |
| 180° Peel Adhesion | 3M C3168 | Wire Mesh to Polypropylene | 560 oz/in |
| Overlap Shear Strength | 3M C3096 | FR-4 | 215 lb/in² |
| Overlap Shear Strength | 3M C3096 | Fir | 275 lb/in² |
| Overlap Shear Strength | 3M C3096 | Polypropylene (PP) | 250 lb/in² |
| Overlap Shear Strength | 3M C3096 | Polyethylene (PE) | 220 lb/in² |
| Two-Pound Dead Load Heat Resistance | 3M C3093 | – | 79°C (175°F) |
| Thermal Shock Resistance | 3M C3167 | – | Passes 5 cycles from 100°C to -40°C without cracking |
| Attribute Name | Test Condition | Value |
|---|---|---|
| Solvent Resistance – Immersed in Isopropyl Alcohol (1 hour) | – | No attack (A) |
| Solvent Resistance – Immersed in Acetone (1 hour) | – | No attack (A) |
| Solvent Resistance – Immersed in RMA Flux (1 hour) | – | No attack (A) |
| Coefficient of Thermal Expansion (-100 ~ -40°C) | – | -34 x 10⁻⁶ m/m/°C |
| Coefficient of Thermal Expansion (-20 ~ 25°C) | – | 154.5 x 10⁻⁶ m/m/°C |
| Thermal Conductivity | 41°C (107°F) | 4.58 x 10⁻⁴ Cal/s/cm/°C |
| Dielectric Constant | ASTM D150, 23°C, 100 Hz | 2.3 |
| Dielectric Strength | ASTM D149 | 1,400 V/mil |
| Volume Resistivity | ASTM D257, 23°C | 4.5 x 10¹⁷ Ω-cm |
Solvent resistance key: A = No attack, B = Slight surface attack, C = Severe attack.
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