Methylcyclopentane

PBT assessment

PBT assessment: overall result

PBT status:

the substance is not PBT / vPvB

Justification:

PBT/vPvB criteria and justification : Persistence (P) Assessment:

A substance is not considered to be persistent if it can be demonstrated that it has potential to degrade (via photolysis, hydrolysis and/or biodegradation).

There is no persistence data available for methylcyclopentane. Key read across data is available for its structural analogue 2-methylpentane, where a biodegradation rate was derived from an OECD 301 C (Ready Biodegradability: Modified MITI test) which was conducted. The test substance was 93-94% degraded at the end of 28 days and is therefore considered to be readily biodegradable by the strict conditions of the OECD 301C criteria. Due to the structural similarity with 2 -methylpentane, it is concluded that methylcyclopentane does not meet the Persistent (P) or very Persistent (vP) criteria either and will also be readily biodegradable.

Bioaccumulation (B) Assessment:

An evaluation of representative hydrocarbon structures indicated that no structures met the Bioaccumulative (B) or very Bioaccumulative (vB) criteria (CONCAWE 2010a). The information requirements and chemical safety assessment Guidance from ECHA (Part C:PBT Assessment (2008), methylcyclopentane is not considered to be bioaccumulative.

Toxicity (T) Assessment:

None of the measured or calculated data for methylcyclopentane, is within the criteria for toxicity stipulated in the ECHA’s Guidance on information requirements and chemical safety assessment - Part C: PBT Assessment (2008). Therefore this substance is not considered toxic (T). As methylcyclopentene is not considered persistent or bioaccumulative. The guidelines do not require the registrant to conduct a toxicity assessment as per Part C: PBT Assessment (2008). An evaluation of representative hydrocarbon structures indicated that no representative structures were identified as PBT or vPvB.

Human Health Hazards Assessment (T)

Carcinogenicity:

The available data on methylcyclopentane do not warrant classification for carcinogenicity under Dir 67/548/EEC or GHS/CLP.

Mutagenicity:

The available data indicate that methylcyclopentane is not genotoxic or mutagenic and do not warrant classification for carcinogenicity under Dir 67/548/EEC or GHS/CLP.

Reproductive Toxicity:

The available data indicate that methylcyclopentane is not developmental or toxic to reproduction and do not warrant classification for carcinogenicity under Dir 67/548/EEC or GHS/CLP.