Surface modification | additives
Company’s UltraWear compounds were introduced in 2013 for these extreme applications that have conven- tionally used thermosets. UltraWear compounds using synergistic wear additives in PEEK, PPA, and PPS have been tested at PV ratios up to 100,000 and temperatures up to 205°C (400°F), says the company. Additives used in the UltraWear compounds include
combinations of carbon fibre/ceramics, carbon fibre/ graphite/PTFE, and proprietary packages. Ceramics have been found to provide the best performance in very severe wear environments (high pressures, velocities, and temperatures) and are used synergistically with other additives in RTP’s highest performance selection. Collet at Lehmann & Voss also notes an increasing
demand for materials that function in high pressure and elevated temperature applications. The company, a compounder of high-performance specialty materials, introduced its Luvocom XTF family of high-performance compounds modified with a proprietary PTFE formula- tion designed for extreme wear applications in March this year. The first compounds in the series are based on PEEK; compounds based on other high-performance polymers are currently in development. “By substituting
standard PTFE additives with our proprietary lubricant and by optimising our processing technology, we have been able to substantially elevate wear resistance performance with these new compounds,” says Collet. The 3M Dyneon Compound New Sealing Technology (NST) 1111R incorporates a 3M Dyneon PTFE matrix and a 3M microsphere filler system to improve proper- ties (including friction and wear) for polymeric seal applications, such as shaft seals and transmission seal rings where low friction and wear resistance are key. Compared to a standard PTFE compound (Dyneon PTFE Compound TF 4105 with glass fibres) used for this application, the new compound offers a 17% improve- ment in friction coefficient. In addition, optimised friction and wear behavior leads to longer service life and less fuel consumption, according to 3M. Celanese introduced a tribologically modified acetal
copolymer called Hostaform SlideX POM in October last year. The compound is designed for use in manufacture of injection molded parts with good mechanical properties and a very low coefficient of friction and wear rate. The company claims it can help reduce energy loss, heat generation and noise in mechanical systems
One of these carbon blacks has optimum absorption properties. The Absorptometer “C“ knows which.
The Brabender® Absorptometer ”C”
for running precise and reproducible absorption tests fully meets ASTM D 2414 including new procedures B and C as well as ASTM D 3493.
■
Suitable for oil absorption tests with carbon blacks and silica
■ Variable programmable titration rate
■ Interchangeable mixers for continuous operation ■
System normalization with standard and customer-individual reference carbon blacks
Brabender® technology optimises the quality of your raw
materials, and ensures your success. Brabender®
GmbH & Co. KG ·
www.brabender.com
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