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Japan CSCL and ISHL

New Substance Notification under Japan CSCL

A company who intends to manufacture or import a new chemical substance shall notify it to three ministries at least three months prior to the manufacture or importation. The three ministries are the Ministry of Economy, Trade and Industry (METI), the Ministry of Labor and Welfare (MHLW), and the Ministry of the Environment (MOE). They have appointed National Institute of Technology and Evaluation (NITE) as the main body to evaluate new substance notifications under CSCL. 

A new substance is defined as a chemical substance other than the following substances:

  • A substance that is on the list of existing and new chemical substances (ENCS);

  • Monitoring chemical substances;

  • Priority assessment chemical substances;

  • Class I or II specified chemical substance.

Japan ENCS consists of two parts:

  • Existing chemical substances placed on Japanese market before 16 Oct 1973 (approximately 20,600 substances);

  • New chemical substances that have been notified under the CSCL, determined to be "safe" and published on government Gazette((approximately 8,000 substances);

Notes: A polymer which is produced from all listed monomers still requires notification under CSCL if the polymer itself is not listed on ENCS. Block-polymers and graft-polymers are not regarded as new substances if their blocks or units are listed on ENCS. 

New Substance Notification under CSCL - Exemption:

The following substances are exempt from new substance notification under CSCL:

  • Impurities(less than 1%w/w)*;

  • Articles;

  • Naturally occurring substances;

  • Substances for R&D purposes;

  • Chemical substances regulated by other laws (i.e, pharmaceuticals, cosmetics, pesticides, food additives, medical device, radioactive material, etc.)

* A new substance in the form of impurity or by-product also requires notification if its concentration is above 1%w/w in a product; 

The picture below shows how to determine if a substance requires new substance notification under CSCL. 

New substance notification Japan CSCL- Types and Data Requirements

Standard Notification

  • Total M/I amount(*) in Japan>1t/y;

  • Data required:

    • Biodegradability study;

    • Partition coefficient;

    • Bioaccumulation study;

    • AMES study;

    • Chromosomal aberration  study;

    • 28-days repeated dose  study;

    • Acute algae/daphnia/fish study;

Low Volume Confirmation

  • Total M/amount in Japan<=10t/y and available data shows that the substance is not non-biodegradable   and not bio-accumulative;

  • Required data: Biodegradability and bio-accumulation studies;

  • No other tox./eco-tox studies are required;

Small Amount Confirmation(**)

  • Total M/I amount in Japan <=1t/y;

  • No testing data is  required;

Other Prior Confirmation

  • For intermediate,  substances used in closed system, and polymer of low concern(***).

  • Relevant supporting documents are required;

New substances notified with standard notification will be added onto ENCS 5 years after its notification. New substances that go through confirmation process will not be added to ENCS.

*Total M/I amount in Japan is the sum of all manufactured and imported volume of the same substance in Japan. It is not the volume manufactured or imported by each legal entity;

**One exception is that small amount confirmation on intermediate allows each legal entity to manufacture or import an intermediate up to 1t/y;

***Criteria for PLC: Large molecular weight (MW>=1,000), content of oligomer (MW<1,000) <1%, and stable in neutral, acid, and alkaline water. Test data required.

New Substance Notification under ISHL

ISHL requires manufacturers and importers to notify a new substance to the Ministry of Labor and Welfare (MHLW) prior to its production and importation. Any substance that is not on ISHL list will be subject to new substance notification under ISHL.

ISHL List also consists of two parts:

  • Existing chemical substances under CSCL(in commerce in Japan before 1973)- approximately 20,600 substances;

  • New substances notified under ISHL and published on government Gazette; 

New Substance Notification under ISHL- Exemptions and Data Requirements

Not all new substances require notification ISHL. The picture below shows how to determine if a substance requires notification under ISHL and which type of notification is applicable.


There are two types of notification under ISHL: standard notification and small volume notification. For standard notification, the information required is AMES study and other information such as manufacturing process, reaction formula, etc. For low volume notification(<100kg/y), no test data is required.

If one applicant has notified a new substance under CSCL, it can omit some information which it already provided under the CSCL regime if it attaches a copy of its CSCL notification to the ISHL notification.

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