Knauer BlueShadow Detector 40D, Инструкция по эксплуатации

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62 Chemical compatibility of wetted materials
BlueShadow Detector 40D Instructions V7647
Polyimide (Vespel®)
This material is wear-resistant and permanent resilient thermically (up to
200 °C) as well as mechanically . It is chemically broadly inert (pH range
1-10) and is especially resistant against acidic to neutral and organic
solvents, but vulnerable to pH strong chemical or oxidizing environments .
It is incompatible with concentrated mineral acids (such as sulfuric acid),
glacial acetic acid, DMSO and THF . In addition, it will be disintegrated by
nucleophilic substances like ammonia (such as ammonium salts under
alkaline conditions) or acetate .
Ethylene-tetrafluorethylene copolymer (ETFC, Tefzel®)
This fluorinated polymer is highly resistant against neutral and alkaline
solvents . Some chlorinated chemicals in connection with this material
should be handled with care . Maximum operating Temperature is 80 ºC .
Perfluorethylenpropylen-Copolymer (FEP), Perfluoralkoxy-Polymer (PFA)
These fluorinated polymers hold similar features as PTFE, but with a lower
operation temperaturte (up to 205 °C) . PTA is suitable for ultrapure appil-
cations, FEP can be used universally . They are resistant against almost all
organic and inorganic chemicals, except elemental fluorine under pres-
sure or at high temperatures and fluorine-halogen compounds .
Polyoxymethylene (POM, POM-H-TF)
POM is a semi-crystalline, high-molecular thermoplastic material which
stands out due to its high stiffness, low friction value and thermic stability .
It can even substitute metal in many cases . POM-H-TF is a combination of
PTFE fibres and acetal resin and is softer and has better slip properties
as POM . The material is resistant against diluted acids (pH > 4) as well as
diluted lyes, aliphatic, aromatic and halogenated hydrocarbons, oils and
alcohols . It is not compatible with concentrated acids, hydrofluoric acid
and oxidizing agent . Maximum operating Temperature is 100 ºC .
Polyphenylene sulfide (PPS)
PPS is a soft polymer which is known for its high break resistance and very
high chemical compatibility . It can be used with most organic, pH neutral
to pH high, and aqueous solvents at room temperature without concerns .
However, it is not recommended for using with chlorinated, oxidizing and
reducing solvents, inorganic acids or at higher temperatures . Maximum
operating temperature: 50 °C .
Polytetrafluorethylene (PTFE, Teflon®)
PTFE is very soft and anti-adhesive . This material is resistant against al-
most all acids, lyes and solvents, except against fluid natrium and fluo-
ride compounds . In addition, it is temperature-resistant from -200 °C to
+260 °C .
Systec AF™
This amorphous perfluorinated copolymer is inert against all commonly
used solvents . However, it is soluble in perfluorinated solvents like Fluo-
rinert® FC-75 and FC-40, and Fomblin perfluor-polyether solvents from
Ausimont . In addition, it is affected by Freon® solvents .