Low pressure moulding materials
Our overmoulding services are based on Henkel Corporation’s brand of thermoplastic hot-melt adhesives called Technomelt (previously known as “Macromelt”), which offer superior overmoulding properties.
While there are many alternatives, we have chosen to work closely with the compounds from Henkel Corporation because this material consistently provides excellent results. The method also offers a cost-effective, reliable product and superior sealing — allowing our electronics experts to create high-quality, durable overmoulding projects which reduce negative impacts on the environment.
Key characteristics
We’ll be there to offer our manufacturing guidance and expertise to support you across the entirety of the project.
Moisture and solvent-resistance requirements will be key factors in selecting a specific grade of material (the softer materials generally offer the best adhesive properties). It’s also important to be aware that most Technomelt moulding materials don’t have good resistance to solvents in combination with mechanical stress.
Macromelt/Technomelt® Material Data Sheet
| Material | Test | OM 652 | OM 6208 | OM 633 | OM 641 | OM 673 |
|---|---|---|---|---|---|---|
| Properties | Method | OM 657 | OM 6208S | OM 638 | OM 646 | OM 678 |
| Color | – | amber/black | amber/black | amber/black | amber/black | amber/black |
| Physical | ||||||
| Specific gravity, S.G. | 0.98 | 0.98 | 0.98 | 0.98 | 0.98 | |
| Service Temperature, °C | -40 to +100 | -40 to +100 | -40 to +130 | -40 to +130 | -40 to +140 | |
| Viscosity @ +210C ( mPa.s ) | 4000 | 3000 | 3500 | 7000 | 3000 | |
| Hardness @ 25°C, shore A | ISO 868/15S | 77 | 78 | 90 | 92 | 88 |
| Hardness @ 125°C, shore A | ISO 868/15S | N/A | N/A | 65 | 63 | 63 |
| Softening point, ball & ring, °C | ASTM E28 | 155 | +155 | +175 | +175 | +185 |
| Cold Flexibility °C | ASTM D3111 | -45 | -42 | -36 | -35 | -50 |
| Moulding temperature, °C | 180 to 230 | 190 to 230 | 200 to 240 | 210 to 240 | 210 to 240 | |
| Viscosity @ 210° C, mPas | ASTM D3236 | 4100 | 3600 | 3700 | 7000 | 3400 |
| Electrical | ||||||
| Dielectric constant @ 1kHz | 6.2 / 6.3 | 6.1 / 6.3 | 4.5 / 4.7 | 5.1 / 5.5 | 4.9 / 4.9 | |
| Volume resistivity, Ohm cm | 1.9×10¹² | 1.9×10¹² | 1.9×10¹² | 1.9×10¹² | 1.9×10¹² | |
| Dielectric strength, kV / mm | >20kV/mm | >20kV/mm | >20kV/mm | >20kV/mm | >20kV/mm | |
| Flammability rating | UL94 File E182771 | V-0 | V-0 | V-0 | V-0 | V-0 |
| Special Properties | Good cold flexibility | RTI value for 6208S 95C | ||||
| Adhesion Properties | ||||||
| Substrate Type | ||||||
| PA6.6 | Good | Good | Moderate | Moderate | Moderate | |
| PVC | Good | Good | Good | Excellent | Good | |
| ABS | Good | Good | Moderate | Moderate | Moderate |
