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Physical & Chemical properties

Melting point / freezing point

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Reference
Endpoint:
melting point/freezing point
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2017-2018
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
comparable to guideline study
Qualifier:
according to guideline
Guideline:
EU Method A.1 (Melting / Freezing Temperature)
GLP compliance:
yes (incl. QA statement)
Type of method:
differential scanning calorimetry
Key result
Melting / freezing pt.:
>= 80 - <= 134 °C

The observations recorded for the visual assessment are shown in the following tables.

 Determination 1

Reading
Number

Sample
Temperature

(°C)

Observations

1

23

Amber colored solid

2

80

Shrinkage / collapse point. Sample collapsing down as it begins to liquify

3

134

Test item appears fully liquefied. Amber clear liquid, bubbles on the surface

4

167

Sample becoming dark amber clear liquid with more bubbles on top. Bubbling up from the liquid

5

189

No change in liquid appearance, layer of bubbles growing

6

210

Test item continues to darken and bubble. Brown clear liquid. Brown staining on tube walls

7

230

Test Item is dark brown liquid, continues to bubble

8

250

Test item is very dark brown / black liquid

9

280

Black opaque liquid

Determination 2

Reading
Number

Sample
Temperature

(°C)

Observations

1

28

Amber solid

2

50

Shrinkage / collapse point. Test Item collapsing down as it begins to liquefy

3

126

Test item appears fully liquefied. Clear amber liquid

4

162

Dark amber clear liquid. Small layer of bubbles above the liquid.

5

190

Dark amber clear liquid. Small layer of bubbles above the liquid.

6

210

Test item continues to darken and bubble. Test item is brown clear liquid, thin layer of bubbles on top

7

226

Test item is a dark brown liquid

8

243

Test item is a very dark brown liquid

9

275

Test item is a black opaque liquid

 

Overall result: Melted over the range 80 to 134 °C (353 to 407 K)

Conclusions:
The melting point of the test item has been determined to be over the range 80 to 134 °C (353 to 407 K).
Executive summary:

The determination of the melting point of the test item Diacid 1550 potassium salt was carried out by differential scanning calorimetry and visual assessment, using a procedure designed to be compatible with Method A.1 Melting/Freezing Temperature of Commission Regulation (EC) No 440/2008 of 30 May 2008 and Method 102 of the OECD Guidelines for Testing of Chemicals, 27 July 1995.

The melting point of the test item has been determined to be over the range 80 to 134 °C (353 to 407 K).

Description of key information

No clear melting point was seen, but a melting range, starting from 80 °C and ending at 134 °C.

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
80 °C

Additional information