Chemical Screening Tool

Chemical Screener

Screen your trade, customs, and legal documents for regulated chemical substances. Upload bills of lading, customs declarations, tariff schedules, SDS, and import/export paperwork to identify CAS numbers and flag compliance issues.

Drag & drop your file here, or

Accepted: PDF, DOC, DOCX, XLS, XLSX — Max 10 MB

Scan Results

Total Pages

Extracted Length

CAS Numbers Found

Example Output

Total Pages

Extracted Length

12,847

CAS Numbers Found

CAS Number	Substance Name	Regulatory Lists
5989-27-5	Limonene
67-56-1	Methanol
1330-20-7	Xylene (mixed isomers)	—
108-88-3	Chemical substance	Regulatory list
64742-49-0	Chemical substance	Regulatory list

Example scan of a solvent-based paint safety data sheet

Chemical screening for trade and customs compliance

CAS numbers in trade documents

CAS (Chemical Abstracts Service) numbers are the universal identifiers for chemical substances in international trade. Customs authorities, freight forwarders, and trade compliance officers rely on CAS numbers in bills of lading, customs declarations, and tariff classification documents to verify whether shipments contain restricted, sanctioned, or controlled substances under EU, US, and international trade regulations.

Why screen trade & customs documents?

Import/export paperwork, customs declarations, and tariff schedules often contain chemical references that trigger regulatory obligations — from REACH registration and CLP classification to customs duty rates and trade sanctions screening. Manually cross-referencing substance data across documents is slow and error-prone. Automated chemical screening catches CAS numbers, flags restricted substances, and prevents costly customs delays, fines, or shipment seizures.

How the chemical screener works

Upload any trade or legal document — the chemical screener extracts text, identifies CAS numbers using pattern matching, and validates each one with the CAS check-digit algorithm. Screened substances are cross-referenced against chemical databases and regulatory lists to flag compliance concerns relevant to customs clearance, import licensing, dangerous goods transport, and chemical safety regulations.

Regulations and trade frameworks that require chemical screening

Chemical screening and CAS number identification is required across chemical safety, customs, and international trade frameworks. Non-compliance can result in shipment delays, fines, import bans, or criminal liability:

REACH

EU regulation requiring registration, evaluation, and authorisation of chemical substances. All substances manufactured or imported above 1 tonne/year must be registered with ECHA using their CAS numbers. Customs authorities verify REACH pre-registration status at EU borders.

CLP

The Classification, Labelling and Packaging regulation requires substances and mixtures to be properly classified and labelled. CAS numbers are mandatory in CLP labels, safety data sheets, and customs documentation for hazardous goods imports.

EU CN

The EU Combined Nomenclature assigns tariff codes (HS/CN codes) to chemical substances for customs duties and trade statistics. CAS numbers are used to correctly classify chemicals under the right tariff heading, determining duty rates and import restrictions.

TSCA

The US Toxic Substances Control Act maintains an inventory of chemical substances. Importers must file TSCA Section 13 certifications with US Customs and Border Protection, confirming CAS numbers against the TSCA inventory before entry.

ADR

The European Agreement for dangerous goods transport requires substance identification by CAS number for transport classification, packaging requirements, and documentation on bills of lading and dangerous goods declarations.

IMDG

The International Maritime Dangerous Goods Code governs sea transport of hazardous chemicals. Shipping lines and customs authorities require CAS identification on bills of lading, dangerous goods manifests, and container packing certificates.

PIC

The Prior Informed Consent Regulation (EU No 649/2012) requires export notifications and consent for certain hazardous chemicals. Exporters must identify substances by CAS number in customs export declarations.

SANCTIONS

EU and US sanctions regimes restrict trade in specific chemicals used in weapons production, dual-use goods, and controlled precursors. Customs screening relies on CAS numbers to flag sanctioned substances in trade documents and export licences.

Common use cases

— Screening customs declarations and import paperwork for restricted or sanctioned substances before clearance

— Verifying bills of lading against ADR, IMDG, and dangerous goods transport requirements

— Cross-referencing tariff schedules with CAS numbers for correct HS/CN code classification and duty rates

— Auditing safety data sheets for complete substance identification before import/export

— Checking export licences and trade documents for dual-use chemicals and controlled precursors

— Screening supplier contracts for SVHC (Substances of Very High Concern) and REACH Annex XIV substances

— Preparing TSCA Section 13 certifications for US Customs and Border Protection import filings

— Extracting chemical data from bills of materials for customs valuation and origin determination

How to use the chemical screener

01 Upload a PDF, DOC, or XLS file — bills of lading, customs declarations, tariff schedules, SDS, import/export permits, or any trade document
02 The chemical screener automatically extracts text and identifies CAS numbers, substance names, and regulatory references
03 Review screened chemicals, their CAS numbers, substance names, and validation against regulatory databases
04 Check flagged substances against REACH, CLP, customs restrictions, and trade sanctions

Need help with chemical screening across your supply chain?

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Frequently asked questions

What document types can I scan?

The scanner accepts PDF, DOC, DOCX, XLS, and XLSX files up to 10 MB. Common documents include customs declarations, bills of lading, tariff schedules, safety data sheets (SDS), bills of materials (BOM), import/export permits, dangerous goods manifests, TSCA certifications, supplier contracts, and trade compliance reports. For best results, ensure the document contains machine-readable text rather than scanned images.

How accurate is the CAS number extraction?

The scanner uses pattern matching to detect CAS number formats and validates each number using the CAS check-digit algorithm. This catches formatting errors and invalid numbers. While highly reliable for well-formatted documents, results should be verified against official sources such as the CAS Registry or ECHA's substance database for regulatory compliance decisions.

Is my uploaded document stored or shared?

Your document is processed in memory during the scan and is not permanently stored on our servers. The file is discarded after the CAS numbers are extracted and validated. No document content is shared with third parties.

Which trade and customs regulations require CAS number tracking?

CAS numbers are required across multiple frameworks: EU REACH for chemical registration and import compliance, CLP for classification and labelling, the EU Combined Nomenclature for tariff classification and customs duties, US TSCA for Section 13 import certifications, ADR/IMDG for dangerous goods transport, the PIC Regulation for export notifications, and EU/US sanctions regimes for controlled substance screening. Customs authorities at EU and US borders increasingly verify CAS numbers against restricted substance lists during import clearance.

How does this help with customs clearance?

Customs authorities screen chemical shipments against restricted substance databases using CAS numbers. By scanning your trade documents before submission, you can identify substances that may trigger import restrictions, require special licences, or need REACH pre-registration verification. This prevents costly customs holds, shipment seizures, and demurrage charges. The scanner also helps verify that CAS numbers on your bills of lading match the corresponding tariff (HS/CN) codes in your customs declaration.

Can I use this for tariff classification?

The scanner extracts CAS numbers from your documents, which is the first step in correct tariff classification. Chemical substances are classified under HS chapters 28–38, and correct CAS identification ensures you apply the right CN code, duty rate, and any applicable anti-dumping or countervailing duties. Misclassification of chemicals in customs declarations can lead to underpayment of duties, post-clearance audits, and financial penalties.

Disclaimer: This chemical screening tool is provided for informational purposes only and does not constitute legal, customs, or trade compliance advice. While CAS number extraction and validation uses standard algorithms, screening results should be verified against official sources such as ECHA, the CAS Registry, and national customs authorities. Always consult with regulatory experts, customs brokers, or trade compliance professionals for import/export and compliance decisions.