How to search in PRIO

In the database PRIO, you can find out if a substance has properties hazardous to health and the environment by searching on the chemical name, CAS Number or EC Number. PRIO can also provide you with information on what chemical products or materials a particular substance may occur in.

Standard search – search on a chemical substance

You can find a certain substance in PRIO by using standard search. If you know the CAS Number or the EC Number of the substance, you can get an exact match by entering the whole number. When searching by the chemical name, you can enter the whole name or a part of the name. If you enter a part of the substances’ name, the search will result in all substances containing that part of the name.

A CAS Number (Chemical Abstracts Service Number) is a registration number for chemicals. It is an international identification number for chemical substances.

An EC Number is used for chemical substances on the EU market. It is a number assigned to the substance in the Einecs, Elincs or the No-Longer Polymers List. Einecs is a European list of the substances considered to have been on the European market between 1 January 1971, and 18 September 1981. Elincs is a European list of notified, new substances. The No-longer Polymers List is a European list covering substances that were on the European market between 18 September 1981, and 31 October 1993, and that, at the time, were considered as polymers. An EC Number contains seven digits following the principle xxx-xxx-x and must start with the digit 2 or 3 (Einecs), 4 (Elincs) or 5 (No-Longer Polymers).

In connection with the registration (including the pre-registration) of chemical substances within Reach, every substance that had no EC Number assigned to them was assigned a List number. The List Numbers always start with the digit 6, 7, 8 or 9. Contrary to EC Numbers, the List Numbers are not official identifications, but they are used in PRIO as a support to substance searches in the database. Read more about registered substances on Echas website.external link

Batch search – search on several chemical substances at the same time

A batch search makes it possible to search on several chemical substances at the same time. You can, for instance, search for all substances that are included in a list of chemicals on the same search in PRIO. When performing a batch search, use the CAS Number or EC Number of the substances.

Advanced search – search on criteria, materials, substance groups etc.

By using advanced search, you can, besides searching on individual chemical substances, also search on Criteria, Materials, Substance groups or Product types. You can also search by Reference - that is, the source from which the substances in the database PRIO come from, and by Priority level for the substance in PRIO.

You can combine several search parameters by using the AND and OR functions. It is also possible to limit the search by combining the search with different filters to prevent the search result from being dominated by specific groups of substances. This applies to complex hydrocarbons, per- and polyfluoroalkyl substances (PFAS) or particularly hazardous metals (compounds with cadmium, mercury and lead). You can also limit a search to include substances only found in chemical products in Sweden.

Last published 7 April 2021