PolyEtherKetoneEtherKetoneKetone (PEKEKK) hydrolysis
PolyEtherKetoneEtherKetoneKetone (PEKEKK) hydrolysis
(OP)
Does anyone have information on PolyEtherKetoneEtherKetoneKetone (PEKEKK) hydrolysis resistance? These are found in products like Victrex ST G45.





RE: PolyEtherKetoneEtherKetoneKetone (PEKEKK) hydrolysis
RE: PolyEtherKetoneEtherKetoneKetone (PEKEKK) hydrolysis
RE: PolyEtherKetoneEtherKetoneKetone (PEKEKK) hydrolysis
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Plymouth Tube
RE: PolyEtherKetoneEtherKetoneKetone (PEKEKK) hydrolysis
RE: PolyEtherKetoneEtherKetoneKetone (PEKEKK) hydrolysis
DI water, as defined by 18 M0hm-cm resistivity, will dissolve atmospheric CO2 when exposed to air, which will make it acidic.
TTFN
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RE: PolyEtherKetoneEtherKetoneKetone (PEKEKK) hydrolysis
Does anyone know of a specific database where I might find hydrolysis data?
RE: PolyEtherKetoneEtherKetoneKetone (PEKEKK) hydrolysis
RE: PolyEtherKetoneEtherKetoneKetone (PEKEKK) hydrolysis
They ended up with a pretty special grade of glass fibre reinforced nylon 6.6.
They had to use special hydrolysis stabilisers for the polymer as nylons are normally prone to hydrolysis, but they also needed a very special grade of glass fibre. It definitely had a special hydrolysis resistant coating to assist in bonding to the polymer, but I think the actual glass was also a special grade.
How this applies to the OP I'm not quite sure other that to alert him that there is more than one source for potential problems and answers might not be generic.
The raw material manufacturer should be the best source of real data with qualifiers about certain grades.
Regards
Pat
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RE: PolyEtherKetoneEtherKetoneKetone (PEKEKK) hydrolysis
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Plymouth Tube
RE: PolyEtherKetoneEtherKetoneKetone (PEKEKK) hydrolysis
Just curious, having seen a few plastic radiator headers. They look awfully smooth, i.e. I don't see much glass fiber showing on the surface. Is it possible these things get an over-mold, or some kind of secondary (post molding) dip treatment to provide a further barrier between the glass fiber and the liquid?
RE: PolyEtherKetoneEtherKetoneKetone (PEKEKK) hydrolysis
The gloss comes from correct moulding techniques of quite hot melt, very large gate, extremely fast injection speed, a very hot mould and lots of hold up time and pressure.
So called glassy surface is typically really silver streaks caused by glass suck back from the surface as the matrix shrinks and the molten sub surface flows relative to the rubbery surface. The glass fibers are then pulled from the surface leaving little voids that show up silvery in appearance and look like glass fibres.
Regards
Pat
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