Priority Existing Chemical assessments

A priority existing chemical (PEC) is an industrial chemical that has been identified as requiring an assessment because there are reasonable grounds for believing that manufacturing, handling, storing, using or disposing of the chemical could be a risk to health and/or the environment.

Following a chemical assessment by NICNAS, there could be changes in circumstances that would later require particular aspects of a chemical to be re-assessed. This process is called secondary notification and assessment.

Read more about priority existing chemicals

Most PEC assessments are accompanied by an easy-to-understand fact sheet which summarises key recommendations for a non-scientific audience.

List of PECs

The assessments are in alphabetical order by chemical or trade name. Click on a letter in the list or use the page links. A name that begins with a number can be found in 1,2,3...

Chemical/trade name: A B C D E F G H I J K L M N O P Q R S T U V W X Y Z 1,2,3...

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Click on the chemical/trade name to download the scientific assessment.

Methylcyclopentadienyl manganese tricarbonyl (MMT) - PEC24 [WORD 659 KB]

CAS number(s): 12108-13-3

Published 1 June 2003

Anti-valve seat recession (AVSR) fuel additives were declared as priority existing chemicals for full assessment on 5 December 2000 (PEC/24). They were nominated by the public because of health and environmental concerns due to their increasing widespread use in automotive lead replacement petrol (LRP). Four AVSRs were notified for assessment. Methylcyclopentadienyl manganese tricarbonyl (MMT) is a manganese (Mn)-based AVSR imported predominantly for addition to LRP and in smaller quantities for formulation of after-market fuel additives.

For a summary of the assessment read the MMT fact sheet.

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Last update 19 September 2019