6-2
Ver.1.36
6.1.1.2 Cleaning by red-heating
This is very simple and works well in most cases.
(1) Remove all the residues left in the cup using a cotton swab. When using a pair of tweezers, do
not scratch the inner surface of the sample cup.
(2) As shown in Fig. 6.1, using a small torch heat the cup for 1 or 2 seconds until it glows slightly red.
If heated longer, it will degrade the overall inertness of the surface. This will shorten the life of the
cup.
(3) When the cup cools (approx. 20 sec) set it in a sample cup holder. Be careful not to burn your
fingers.
6.1.1.3 Solvent cleaning
When analyzing samples containing or forming polar compounds, sample cups should not be cleaned
using heat.
(1) Remove sample residues remained in the sample cups using a cotton swab. If a pair of tweezers
is used, do not to scratch the inner surface of the sample cup.
(2) Place sample cups to be cleaned in a beaker containing a solvent. This is to dissolve or swell
residual polymer. Verify that the solvent used will dissolve or swell the polymer sample.
(3) Apply ultrasonication for one minute.
(4) Remove the solvent from the sample cups, and clean the inner wall of the cup with a cotton swab
and the like.
(5) Place the cups in a beaker containing the solvent and swirl them for a short period of time.
(6) Replace the solvent and repeat (3) through (5) two to three times. Dry the cups in an oven before
use.
Fig. 6.1 Red-heating with a small torch
When using a flame, make sure there is no flammable materials around
and work only in a well-ventilated area. Wear safety goggles for your
safety.
When handling solvents, ensure there is no ignition source around and
work only in a well-ventilated area. Wear safety goggles for your safety.
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