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EC number: 202-443-7
CAS number: 95-71-6
Performance of measurements with capillary method
The boiling behavior of the test item was confirmed by
measurements with the capillary method:
A small quantity of the test item was filled up to 4 – 5 mm into a
capillary and compacted by tapping on the capillary. The capillary and a
thermometer were heated in the Büchi melting point apparatus from
120 to 400 °C at a heating rate of 10 K/min. The test item was watched
while having been heated. When the test item started to melt or boil,
the actual temperature was recorded.
The test item shows an endothermic effect in the temperature range
of 120 – 150 °C, which can be associated with a melting of the test item
(melting point according to the certificate of analysis 127.1 °C). A
second endothermic effect was observed in the temperature range of
230 – 310 °C, which cannot be clearly assigned to a boiling of the test
item. No further thermal effects could be observed up to the maximum
test temperature of 500 °C.
of the DSC-measurements
Sample weight / mg
Onset of Effect / °C
Range of effect / °C
Weight loss / mg
Atmospheric pressure / hPa
120 – 150 (endo)230 – 310 (endo)
120 – 150 (endo)230 – 300 (endo)
Due to the fact that the second
endothermic effect could not be assigned to a boiling of the test item,
due to its decomposition starting at 240 °C (see capillary method), the
test item has no boiling point before its decomposition starting at a
temperature of approx. 240 °C.
The test item Methylhydroquinone has no boiling point up to its
decomposition starting at approx. 240°C as determined by differential
scanning calorimetry and capillary method according to Regulation EC
No. 440/2008 Method A.2. and OECD Test Guideline 103 (1995).
to Annex VII section 7.3, Column 2 of regulation (EC) 1907/2006, the
study does not need to be conducted because the test item
Methylhydroquinone decomposes before boiling. Decomposition starts at
approx. 240 °C as
determined by differential scanning calorimetry and capillary method
according to Regulation EC No. 440/2008 Method A.2. and OECD Test
Guideline 103 (1995).
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