Semi-crystalline, partially aromatic polyamides such as Grivory HT3 from Ems-Grivory, Ems, Switzerland, are characterized by extremely low moisture absorption and therefore excellent dimensional stability. This property is particularly valuable for small components that have to meet high precision requirements. Connectors are a good example of such components. They must fit into each other at any time under varying climatic conditions. Whether it is hot or cold, dry or humid – the material must guarantee the long-term dimensional stability and low warpage of the components.
Connectors are usually assembled by reflow soldering. The problem of blistering therefore plays an important role with these precision components. Polyphthalamide (PPA) produced on the basis of long-chain diamines is best suited for these applications because of its resistance to blistering. It also has advantages to offer over conventional PPA in terms of elongation at break and toughness. Grivory HT3 absorbs around 50 % less moisture than Grivory HT1. This results in improved dimensional stability and hydrolytic resistance, while also reducing creep. Grivory HT3 has a wider processing window than other PPAs because of its high melting point of 295°C. In everyday practice, this allows greater latitude in terms of processing parameters.
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