IECSC is the Chinese national chemical inventory, listing substances that were legally manufactured, imported, used, or sold in China before 2003. The inventory has approximately 46,000 entries as of 2026. A substance not on IECSC is treated as a “new chemical substance” under MEE Order 12 (the regulation governing new chemical substance management) and requires a New Chemical Substance Notification (NCSN) before it can be manufactured in or imported into China. The regime is functionally similar to TSCA in the US and REACH in the EU, but the procedural and cost burdens differ.
What “on IECSC” means in practice
A substance on IECSC can be manufactured or imported into China without a chemical-substance notification. The substance still must comply with all other applicable regimes, environmental, transport, occupational health, hazardous chemicals licensing, customs, but the inventory check is satisfied.
A substance not on IECSC requires NCSN before any manufacture or import beyond very small research quantities. The NCSN must be filed by the Chinese manufacturer or importer (foreign suppliers cannot file directly).
The four NCSN tracks
| Track | Threshold | Data requirements | Timeline | Approximate cost |
|---|---|---|---|---|
| Regular notification | > 10 t/yr | Full hazard, environmental fate, toxicity dossier | 9-15 months | RMB 600,000 to 1,200,000+ |
| Simplified notification | 1-10 t/yr OR special-purpose | Reduced dossier | 4-6 months | RMB 100,000 to 250,000 |
| Scientific research notification | < 100 kg/yr for R&D | Minimal | 2-3 months | RMB 30,000 to 80,000 |
| Sample registration | < 100 kg over 2 years for testing | Just notification, no dossier | 1-2 months | RMB 10,000 to 30,000 |
The cost ranges include consultancy fees, which are the dominant cost component. In-house notification by a major chemical company is cheaper but rare for foreign substances.
Implications for importers from China
Most buyers source substances from China that are already on IECSC. The IECSC question matters for:
- Specialty chemicals new to the China market. A buyer commissioning a Chinese factory to produce a new specialty chemical from imported intermediates must verify both the final product and any imported intermediate are IECSC-listed (or covered by an existing NCSN).
- Custom synthesis. A factory taking on a custom synthesis of a substance not on IECSC must run NCSN before commencing commercial production. The 9 to 15 month regular-notification timeline is often the rate-limiting step on a custom synthesis project.
- Imported intermediates for re-export from China. Even if the final product is exported (not consumed in China), the intermediate imported into China must clear the IECSC / NCSN gate.
How to check IECSC status
Three approaches:
- MEE official IECSC search portal. Chinese-language interface, requires Chinese substance name. Reliable but accessibility from outside China can be intermittent.
- Commercial regulatory consultancy databases. CIRS Group, REACH24H, and others maintain searchable IECSC databases in English. Subscription cost RMB 10,000+ per year.
- The factory’s compliance team, most established Chinese chemical factories run IECSC checks routinely as part of order acceptance. A simple email to the factory’s compliance contact returns a confirmation in 1 to 3 days.
For routine commodity chemical purchases, the IECSC status is rarely a blocker, the substance is on the list. For specialty or new-to-China substances, allow 1 to 2 weeks for a definitive IECSC check before committing to volume orders.
The China-foreign IECSC equivalence question
Buyers sometimes ask whether a substance on TSCA, REACH, or AICIS is “automatically” on IECSC. The answer is no. Each inventory was built independently. About 80 to 85% of TSCA active substances are also on IECSC, but the overlap is incomplete. A substance that has been freely traded in the EU for 20 years can still be a “new” substance in China requiring NCSN.
Conversely, IECSC includes a number of substances that are not on TSCA or REACH, substances historically manufactured in China that never had a Western export presence.
Recent regulatory tightening
MEE has been progressively tightening NCSN requirements since approximately 2020:
- The data dossier for regular notification has expanded several times
- Environmental fate and ecotoxicity data requirements are now closer to REACH-tier
- Post-notification monitoring obligations have been added (the manufacturer must report production volume and use changes annually)
The trend means new chemical substance notifications in China are now a 12-month-plus project for any non-trivial substance. Plan accordingly for any custom synthesis or new-to-China specialty work.
Operator note: the “new substance” trap on minor variants
A substance on IECSC under one CAS number may not cover a closely related variant under a different CAS. A common example: an IECSC-listed substance in its sodium salt form may not cover the potassium salt form. The buyer assumes parity and the factory accepts the order; the order then stalls in NCSN review for the unlisted potassium form. Verify the exact CAS number of the substance to be ordered against the IECSC entry, not just the parent name.
Related terms
REACH is the EU equivalent. TSCA is the US equivalent. AICIS is the Australian equivalent. K-REACH is the Korean equivalent. MEE is the Chinese ministry administering IECSC and NCSN.