THERMOPLASTIC ELASTOMERS | MATERIALS
requirements: Thermolast S,” it says. These TPEs set a new benchmark due to their
wide processing window, the supplier says. Compounds are processable with a melt tempera- ture ranging from 180°C up to 250°C, with a mould temperature between 30 and 50°C without sticking in the mould (even without any special mould coating). Long flow paths can be achieved, even with low injection pressures. The colourable materials can be 3D printed as well as injection moulded.
Earlier this year, Avient unveiled the Versaflex CE 3130 series of TPEs, which it says are engi- neered to overcome the challenge of surface blooms on over-moulded consumer electronics. Blooming is the result of improper injection moulding conditions or the incompatibility of a material with certain additives. “Our new devel- oped formulation can balance the polymer and additives perfectly, and together with our process- ing guidance, the bloom problem can be ad- dressed,” says a company representative. Avient says the new materials provide a “pre-
mium, silky-soft over-moulded surface [and] also offer critical UV and stain resistance to endure
Weathering resistance (QUV ASTM G154) of three types of TPU Source: Lubrizol
everyday wear and tear. Because they over-mould onto PC and PC/ABS with a smooth surface, they eliminate the need for secondary coatings. In addition, the materials’ outstanding mould release improves cycle times, reducing overall energy use.” Lubrizol Engineered Polymers says it is
responding to calls for softer, more sustainable materials with faster processing speeds. Estane Silk 91T70, an aliphatic thermoplastic polyurethane (TPU), can be used to mould parts with smooth, soft
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