Registration Dossier

Physical & Chemical properties

Additional physico-chemical information

Administrative data

Endpoint:
additional physico-chemical information
Type of information:
experimental study
Adequacy of study:
supporting study
Study period:
2012-06-29
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
study well documented, meets generally accepted scientific principles, acceptable for assessment
Remarks:
The study was conducted using an acceptable scientific method but not in compliance with GLP.

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2013
Report Date:
2013

Materials and methods

Principles of method if other than guideline:
The relative hygroscopicity is determined by repeated measurements of the weight of the sample under defined and constant humidity.
GLP compliance:
no
Endpoint investigated:
swelling in water

Test material

Reference
Name:
Unnamed
Type:
Constituent
Test material form:
solid: particulate/powder
Remarks:
migrated information: powder

Results and discussion

Results:
The sample was observed to undergo strong hygroscopicity under humid conditions similar to typical ambient conditions.

Any other information on results incl. tables

Analytical data

Time (h)

Tar mass (g)

Gross mass (g)

Net mass (g)

Water uptake (g)

0

37.49592

42.61122

5.11530

000000

1

37.49592

42.65770

5.16178

0.04648

2

37.49592

42.70677

5.21085

0.09555

3

37.49592

42.73657

5.24065

0.12535

4

37.49592

42.75490

5.25898

0.14368

5

37.49592

42.75779

5.26187

0.14657

20

37.49592

42.78721

5.29129

0.17599

21

37.49592

42.78681

5.29089

0.17559

23

37.49592

42.79020

5.29428

0.17898

25

37.49592

42.80170

5.29803

0.18273

27

37.49592

42.80170

5.30578

0.19048

48

37.49592

42.80854

5.31262

0.19732

120

37.49592

42.81980

5.32388

0.20858

144

37.49592

42.81960

5.32368

0.20838

168

37.49592

42.81733

5.32141

0.20611

192

37.49592

42.81649

5.32057

0.20527

288

37.49592

42.81000

5.31408

0.19878

312

37.49592

42.80820

5.31228

0.19698

336

37.49592

42.80564

5.30972

0.19442

Under humidity conditions similar to typical ambient conditions, BHMTP exhibits a strong hygroscopicity. The surface of the BHMTP particles is covered quickly with a humidity layer leading firstly to an agglomeration of the initial fine particles and subsequently to the formation of larger aggregates already within the first 48 hours of exposure. Under the experimental conditions the water uptake approaches within 48 hours also a maximum value. This is caused by the coverage of the particles with an initial glue-like adsorption layer which prevents further water uptake.

Applicant's summary and conclusion

Conclusions:
The substance undegoes strong hygroscopicity under ambient conditions using an acceptable scientific method. The result is considered reliable.