Heat-Resistant Polyamide Grivory HT2VS-HH
Constant Performance at High Temperatures
EMS-Grivory in Domat, Ems, Switzerland, has introduced Grivory HT2VS-HH, a highly heat-resistant polyamide. These modified polyphthalamides are well suited for long-term use at extreme long-term stress due to high temperatures. They can withstand heat ageing over a wide range of temperatures, i.e. from 180°C to 250°C. The company claims there are no stabilizer gaps with this material, and its ageing resistance increases as temperatures rise. Properties do not change at the highest temperature range between 230 and 250 °C. While exposed to 250°C over 3,000 hours, the material’s fracture stress resistance remains almost unchanged, for instance.
The stress-strain behavior of the material is comparable to that of a similarly reinforced PPS, though with a higher fracture elongation. Considering the two materials’ heat ageing resistance after 1,000 hours at 250°C, this plastic material shows a higher level of resistance. Starting from the mechanical properties at the outset of ageing being higher already, the retention of properties is higher by more than 60 %, concerning fracture stress, and by more than 100 %, concerning fracture elongation, as compared to a respective PPS type.
The material was validated by numerous OEMs and Tier-1 users. For example, the products, just as Grilon TSG-30/4 W2 before, were submitted to tests at the central laboratories at Volkswagen; they were rated “1” for 230°C, and approved also for 250°C.
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