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2006-11-07 News Release
PEEK – Plastics Heat Shield Plastics have now taken over in many applications formerly dominated by metals, such as PEEK, that allows it to withstand heat, cold, and mechanical stress equally well.
Polyetheretherketone, or PEEK* for short, are plastics that can compete
with metal in a number of applications. And it can withstand icy temperatures,
as well as extreme heat or high mechanical stress. Uwe Kannengieber from
Degussa AG, Dusseldorf, Germany, explains: “PEEK is able to retain
its long-term heat resistance at 260°C [500°F]“.
A descriptive example can be found in the growing number of automotive
applications – ranging from sealing caps in vacuum pumps to swash
plates in electrical parking brakes and stop disks in couplings and gears.
Since the components keep getting smaller as the space available for them
keeps being reduced, they have to transmit large forces on increasingly
smaller surfaces. Only high wear-resistant parts made of PEEK are up to
these challenges. Independently of these considerations, PEEK is also
desirable for technical and economic reasons. In contrast to metal parts
for example, gearwheels and other components made of polymers are easy
to manufacture by injection molding. Since they contain graphite as a
filler, they are self-lubricating, eliminating the need for additional
lubricants and substantially reducing maintenance costs. The construction weight of modern aircraft can be significantly reduced in this manner, permitting a corresponding increase in the useful load. Most amazingly, the polymer has even pushed aside metals in terms of wear resistance. Manufacturers of compression pumps and drinking-water feed pumps are already taking advantage of plastics with these properties to increase the lifetimes of their entire systems, such as coldwater treatment plants. The polymer is completely innocuous biologically. This makes it possible
to use a thin plastic layer to efficiently prevent wear on the heads of
artificial hip joints, which are made of a titanium alloy. Even the hoses
that are used in dialysis are now beginning to be manufactured of PEEK.
PEEK also shines in meeting the requirements imposed by other branches
of medical technology. One example is inhalers for asthma patients, wherein
a tiny distribution nozzle helps build up high pressure within a very
short time, enabling the inhalant to be released in strong bursts. The
forces acting on the material are so large that PEEK has become the material
of choice because of its high wear-resistance.
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