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.

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Characteristics

  • Based on natural fatty acids

  • Good adhesion to plastics like PA6.6, ABS and PVC

  • Low-temperature flexibility

  • Wide service temperature range

  • Each grade of material is available in both amber and black

  • Bespoke colours are available

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

Want to discover more about our turnkey electronics manufacturing services and how we can help with your next project?