MATERIALS | HIGH TEMPERATURE PLASTICS
of electric cars, parts needed in decoupling units and the gearbox demand high-performance materials,” Collett notes. “Luvocom 25 products have been customised and are available now for this area.”
LehVoss says customised Luvocom compounds based on DSM’s ForTii Ace PA4T provide outstanding mechanical properties at high temperatures. Graph compares variations in shear modulus with temperature in one grade, Luvocom 25-9901, and compounds of other high-temperature polyamides. Source: LehVoss
Based on DSM’s Stanyl PA46 (not a PPA, but still with very good heat resistance), XECARB 37 and XEBRID 37 are two families of carbon fibre and hybrid carbon/glass fibre reinforced compounds launched last year by Xenia in Italy. The company says PA46 is known for its unmatched performance and value for demanding applications in which superior heat resistance, design stiffness, wear and friction, and process flow qualities are required. “Thanks to the application of structural reinforce- ments the new grades XECARB 37 and XEBRID 37 exhibit high tensile modulus, tensile strength at break up to 275 MPa, improved HDT, good fatigue resistance, higher dimensional stability and better surface hardness. Furthermore, the use of carbon fibres within the XECARB 37 family provides improved electrical properties and better resist- ance to UV and chemical agents like oils and hydrocarbons.” Xenia says that with the development of the new
grades XEBRID 37 hybrid carbon/glass reinforced compounds, the impact properties have improved, “always maintaining a high crystallinity level and a great flow behaviour, typical for the polymer’s aliphatic molecular structure.” The company expects the new compounds to find use in a wide range of structural and conduc- tive applications characterised by high operating temperature resistance, together with good chemical resistance and low friction. Back at Akro-Plastic, another new high-temper-
Flexural modulus (MPa) of Xenia compounds based on PA46
LehVoss says that cooperation between it and
DSM, together with automotive systems supplier CarNaTrix, is helping accelerate metal replacement in transmission components. “In this partnership materials and part designs have been optimised to enable new ground-breaking automotive systems,” says Thomas Collet, Director 3D Printing Materials & Marketing, in the Customised Polymer Materials business unit at LehVoss. The latest development is material solutions for e-mobility. “In the powertrain
68 COMPOUNDING WORLD | October 2020 Source: Xenia
ature product is Precite E GF 50 natural (7300), a 50% glass reinforced crystalline PET. Thilo Stier says PET is “widely undervalued” for engineering applications. “This grade has extremely low creep and excellent mechanical properties,” he says. “With a melting point of 255°C and a high Tg, Precite E can be a cost-efficient alternative to PPA grades. At 120°C, mechanical properties are just as good as PA6T, but at a much lower price.” He says: “Comparing the stress strain behaviour
of PET and PA 6T, both 50% reinforced, shows almost equal values at 120°C. The flex modulus at room temperature reaches 21 GPa and tensile/flex strength is 225 MPa/350 MPa.” These impressive properties are independent
from any moisture pick up – a big advantage versus conventional PPA grades, says Stier, who adds: “We will soon see some parts weighing well over 1kg in Precite substituting diecast magnesium.” Akro is
www.compoundingworld.com
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