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Environmental fate & pathways

Additional information on environmental fate and behaviour

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Administrative data

Endpoint:
additional information on environmental fate and behaviour
Type of information:
experimental study
Adequacy of study:
supporting study
Reliability:
3 (not reliable)
Rationale for reliability incl. deficiencies:
other: Unrealistic test conditions (also assessed by OECD)

Data source

Reference
Reference Type:
publication
Title:
Unnamed
Year:
1986

Materials and methods

Test guideline
Qualifier:
no guideline available
Principles of method if other than guideline:
Thermogravimetric analysis followed by dynamic headspace GC/MS
GLP compliance:
no
Type of study / information:
Analysis of products produced from thermally stressed plastics - TPP from thermolysis of polymer powder

Test material

Reference
Name:
Unnamed
Type:
Constituent
Specific details on test material used for the study:
Plastics containing TPP

Results and discussion

Any other information on results incl. tables

Heating a commercially polycarbonate specimen as powder (extremely high surface) 
showed weight loss beginning at 420 °C, whereas a commercially  polyphenylene 
specimen as powder showed weight loss beginning at 190 °C.  Injection molding 
temperatures for polycarbonate polymers are between 249  to 315 °C.
GC/MS analysis of vapours resulting from heating the polycarbonat powder and the polyphenylene powder to 250 °C yielded weight loss of 1 % and 8 % resp. and weight fractions of 0.05 % TPP and 3.6 % TPP resp. refering to the loss in weight.

Applicant's summary and conclusion

Conclusions:
A method is described for determing TPP released from thermally stressed polymers. However, the test conditions are unrealistic compared to normal use conditions