Registration Dossier

Administrative data

Description of key information

Extrapolated LD50 oral rat between 50 and 300 mg/kg bw/day.

Key value for chemical safety assessment

Acute toxicity: via oral route

Endpoint conclusion
Endpoint conclusion:
adverse effect observed
Quality of whole database:
Test procedure in accordance with generally accepted scientific standards and described in sufficient details.

Acute toxicity: via inhalation route

Endpoint conclusion
Endpoint conclusion:
no study available

Acute toxicity: via dermal route

Endpoint conclusion
Endpoint conclusion:
no study available

Additional information

LD50 rat oral route for  Tetraphosphorus trisulphide was extrapolated by preliminary study OECD TG 422 and the value was set between 50 and 300 mg/kg bw/day.

According to annex VIII of the REACH Regulation (EC n.1907/2006) testing by the dermal route is appropriate if: (1) inhalation of the substance is unlikely; and (2) skin contact in production and/or use is likely; and (3) the physicochemical and toxicological properties suggest potential for a significant rate of absorption through the skin. For Tetraphosphorus trisulphide inhalation is unlikely due to the low vapour pressure of the substance and skin contact in production or during the use of matches can occur. However, the experimental dermal absorption of P4S3 after 22h of exposure is very low (1.8 %) and it is even lower considering the only use of Tetraphosphorus trisulphide in the matches where P4S3 is applied included into a resin. The experimental dermal absorption of P4S3 containing as 10 % into the resin was 0.4 % after 30 minutes. Based on the dermal absorption evaluation, an acute dermal toxicity study is not necessary.

Testing by inhalation route is not appropriate for this substance because the exposure of human via inhalation is unlikely.

Justification for classification or non-classification

LD50 rat oral route for  Tetraphosphorus trisulphide was extrapolated by preliminary study OECD TG 422 and the value was set between 50 and 300 mg/kg bw/day. The classification H301 (acute oral toxicity cat.3) is suggested for the substance according to the CLP Regulation (EC n.1272/2008), even though this substance has an harmonised classification as H302 (acute oral toxicity cat. 4).

There is no concern regarding acute dermal toxicity of Tetraphosphorus trisulphide considering the experimental dermal absorption data obtained testing the solid substance and the resin at 10 %. The inhalation exposure is unlikely due to the low vapour pressure of the substance.