4.2 Maintenance of Peristaltic Tube
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4.2.3 Checking Chemical Resistance of Peristaltic Tube
Prior to measurement of a sample used for the first time, check the
chemical resistance of the peristaltic tube against the sample.
Follow the procedure below to check the chemical resistance under
the same conditions (concentration and temperature) as the actual
measurement.
After immersing the peristaltic tube in the sample for a few days,
check that the tube has neither lost its elasticity nor been dissolved. If
the tube has lost its elasticity, its lifetime is assumed to be shortened
by the use of the sample. If the tube has been dissolved, the sample
cannot be used.
The tube that has been immersed in a sample for a few days may be
swollen from the effect of the sample. In this case, wash the tube
with pure water and leave it in the atmosphere for almost one day. If
the tube has been returned in its original condition, it can be used.
The peristaltic tube has the chemical resistance as described below.
NOTE:
The chemical resistance can be greatly varied depending
on the concentration or temperature. Therefore, the data is
intended to be used just for reference.
<Unusable chemicals>
Acetaldehyde, acetonitrile, acetone, aniline, ethylamine, ethylene
chlorohydrin, ether, acetyl chloride, ethyl chloride, methyl chloride,
aniline hydrochloride, paraffinum liquidum, animal oil, aqua regalis
(nitrohydrochloric acid), oleic acid, perchloric acid, hydrogen
perchloride (90%), high aromatic gasoline, non-aromatic gasoline,
xylene, cresol, chloroacetic acid, chlorobromomethane,
chlorobenzene, chloroform, ketone, amyl acetate, ethyl acetate,
acetate (low molecular mass), butyl acetate, diacetone alcohol,
carbon tetrachloride, cyclohexane, cyclohexanone,
dimethylformamide, acetyl bromide, ethyl bromide, bromine,
concentrated nitric acid, concentrated potassium hydrate,
kerosene, trichloroethylene, toluene, ethylene dichloride,
nitrobenzene, carbon disulfide, perchlorethylene, pyridine,
hydrofluoric acid (75%), freon, propanol, benzaldehyde, aromatic
hydrocarbon, acetic anhydride, methyl ethyl ketone, lacquer,
butyric acid, concentrated sulfuric acid, etc.
