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PBT assessment

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PBT assessment: overall result

PBT status:
the substance is not PBT / vPvB
Justification:

1,1,1,2 -tetrafluoroethane (HFC 134a) is a gas (B.P. -26.2°C) of low water solubility. As consequence, exposure of the aquatic environment, sediments and soil is unlikey. Further, an assessment of the PBT status of 1,1,1,2-Tetrafluoroethane (HFC 134a) has been made using all available data. This information suggests that HFC 134a does not meet the criterial for PTB/vPvB.

Persistence

HFC 134a is a gas (B.P -26.2°C) of low solubility and when released to the environment will enter almost exclusively into the ambient air. It has little tendency to partition to biota or soil. Because of its moderate sorption affinity, HFC 134a is expected to be mobile in soil. The most important degradation process occurs in the atmospheric compartment. Consequently HFC 134a will not be persistent in the aquatic environment.

Bioaccumulation

The measure log Kow of HFC 134a is 1.06, and hence biocaccumulation is not expected. HFC 134a is therefore considered not bioaccumulative.

Toxicity

The measured acute effect concentrations are much higher than the screening criterion of 0.1 mg/l. It can therefore be expected that HFC 134a is not toxic towards aquatic organisms. The chronic effect concentrations for invertebrates and fish are likely to be much higher than the definite criterion of 0.01 mg/l. HFC 134a is not classified as being a CMR and there is no evidence that it is chronically toxic towards mammals. Therefore HFC 134a is not assigned as toxic.

Conclusion

The overall conclusions, of the PBT assessment are that the criteria for PBT / vPvB are not met, and that HFC 134a can be considered to be not PBT/vPvB.