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Physical & Chemical properties

Additional physico-chemical information

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Administrative data

Endpoint:
additional physico-chemical information
Type of information:
experimental study
Adequacy of study:
key study
Study period:
13-20 Oct 2015
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Guideline study with restrictions

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2015
Report Date:
2015

Materials and methods

Test guideline
Qualifier:
according to
Guideline:
other: UN Method C.1
Deviations:
yes
Principles of method if other than guideline:
Metal sheet (steel and aluminium coupons) immersion test at 55 °C for 1 week.
Deviations:
- At least 3 sets (9 spicemens) of each material shall be used (UN/SCETDG/20/INF.27)
- The entrance of air has to be guaranteed (UN C.1). Not achieved in closed bottles used.
- For hygroscopic substances the UN Subcommitee of Experts ofTDG recommends: “… in case, the most aggressive concentration is not known by the tester, he has to approach the concentration with the highest corrosiveness in steps of 10%. Therefore two or three tests have to be carried out at the same time". (UN/SCETDG/20/INF.27)
GLP compliance:
no
Endpoint investigated:
other: corrosive to metals

Test material

Reference
Name:
Unnamed
Type:
Constituent
Details on test material:
- Name of test material (as cited in study report): reaction mass of tetra (potassium and sodium) (2R, 3R)-2-hydroxy-3-(phosphonatooxy) succinate and tetra (potassium and sodium) (2S,3S)-2-hydroxy-3-(phosphonatooxy) succinate
- Appearance: white granular powder
- Analytical purity: >=84% (w/w)
- Date of production: 16 Sep 2014
- Lot/batch No.: 010-2065

Results and discussion

Results:
Concentrated aqueous solutions of the test substance can be considered as not corrosive to metals.

Any other information on results incl. tables

There was no visual damage to the coupons employed (see attached figure). No signs of localized corrosion could be detected.

Detailed results:

Specimen

Steel C1010

Aluminium AL1100H14

Test duration in days (d)

7

7

Metal sheet factor (f)

0.025

0.074

Starting weight (g)

8.2014

3.0052

Weight after test (g)

8.1990

3.0041

Mass loss (g)

0.0024

0.0011

Corrossion rate (mm/a)

0.01

0.00

The corrosion rates determined (0.01 mm/a for steel and 0.00 mm/a for aluminium) do not exceed the threshold value of 6.25 mm/a for any of the two metals tested.

Applicant's summary and conclusion