Agilent InfinityLab LC Series Diode Array Detectors User Manual
63
4
Preparing the Module
Solvent Information
MP35N
MP35N is a nonmagnetic, nickel-cobalt-chromium-molybdenum alloy
demonstrating excellent corrosion resistance (for example, against nitric and
sulfuric acids, sodium hydroxide, and seawater) over a wide range of
concentrations and temperatures. In addition, this alloy shows exceptional
resistance to high-temperature oxidation. Due to excellent chemical resistance
and toughness, the alloy is used in diverse applications: dental products, medical
devices, nonmagnetic electrical components, chemical and food processing
equipment, marine equipment. Treatment of MP35N alloy samples with 10 %
NaCl in HCl (pH 2.0) does not reveal any detectable corrosion. MP35N also
demonstrates excellent corrosion resistance in a humid environment. Although
the influence of a broad variety of solvents and conditions has been tested, users
should keep in mind that multiple factors can affect corrosion rates, such as
temperature, concentration, pH, impurities, stress, surface finish, and dissimilar
metal contacts.
Polyphenylene Sulfide (PPS)
Polyphenylene sulfide has outstanding stability even at elevated temperatures. It
is resistant to dilute solutions of most inorganic acids, but it can be attacked by
some organic compounds and oxidizing reagents. Nonoxidizing inorganic acids,
such as sulfuric acid and phosphoric acid, have little effect on polyphenylene
sulfide, but at high concentrations and temperatures, they can still cause material
damage. Nonoxidizing organic chemicals generally have little effect on
polyphenylene sulfide stability, but amines, aromatic compounds, and
halogenated compounds may cause some swelling and softening over extended
periods of time at elevated temperatures. Strong oxidizing acids, such as nitric
acid (> 0.1 %), hydrogen halides (> 0.1 %), peroxy acids (> 1 %), or chlorosulfuric
acid degrade polyphenylene sulfide. It is not recommended to use polyphenylene
sulfide with oxidizing material, such as sodium hypochlorite and hydrogen
peroxide. However, under mild environmental conditions, at low concentrations
and for short exposure times, polyphenylene sulfide can withstand these
chemicals, for example, as ingredients of common disinfectant solutions.
PEEK
PEEK (Polyether-Ether Ketones) combines excellent properties regarding
biocompatibility, chemical resistance, mechanical and thermal stability. PEEK is
therefore the material of choice for UHPLC and biochemical instrumentation.
It is stable in the specified pH range (for the Bio-Inert LC system: pH 1 – 13, see
bio-inert module manuals for details), and inert to many common solvents.
