Check a list of CAS numbers against the AICIS snapshot
Paste one CAS per line, or choose a CSV. A hit means this file stores that exact number. A miss is not a finding that the chemical is absent from the live inventory.
The file has 317 rows and no registration id. One name at a time is on the AICIS checker. The EU list is on the REACH CAS list. The live search is at AICIS.
Paid plans · from USD 59 a month
Paste up to 50 CAS numbers and copy one report. The same plan includes the REACH CAS list. This page still does not store a registration id.
Start the 3 day trialWhat a line means
7664-93-9 is stored as Sulfuric acid, formula H2SO4. The use text says battery acid, lead-acid batteries, ore processing, and fertiliser production. The status text says to verify on the AICIS search before importing. The registration id is empty.
121-33-5 is not in this snapshot. That miss is not a finding that vanillin is absent from the live inventory. This file is 317 rows, not the whole inventory.
Source: public/data/aicis-inventory.json, updated_at 2026-05-16T22:31:02.582Z, 317 entries, drawn from the AICIS inventory search.
Frequently asked
Does a hit mean the chemical may be introduced?
No. Every row in this file stores the status text "verify per AICIS Inventory search before importing", and every registration id is empty. A hit copies the name, formula, and use stored here. The live search is the binding check.
What if the CAS is not in the file?
The file has 317 rows, dated 16 May 2026. A miss means that CAS is not one of those 317. It is not a finding that the chemical is absent from the live AICIS Inventory. Check the AICIS search.
Why can I only run three numbers?
Three CAS numbers are free, so you can see the report before you pay. Paid plans start at USD 59 a month and run up to 50 from a paste or a CSV, then let you copy the report.
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Sourzi shows what official files say. It is not customs or legal advice. For a binding answer, ask a licensed customs broker, a CBP ruling or an Australian Border Force Tariff Advice.
File dates and links are on Data sources.