OECD eChemPortal

OECD eChemPortal is the OECD's aggregation of government chemical data — 34 national and regional databases queried in one pass, spanning substance identity, physicochemical properties, environmental fate, ecotoxicology, toxicology and GHS classifications. The contributor roster runs from ECHA's REACH dissemination and classification inventory to the US EPA's hazard resources, Japan's J-CHECK, Canada's Categorization Results, Australia's AICIS assessments and Germany's ETOX. The portal's own published census counts 683,840 substance records, 1,136,073 endpoint records and 805,418 synonyms.

Three query paths cut across all of it: substance lookup by name or CAS Registry Number, property queries against a structured endpoint tree, and classification lookups against the harmonized GHS code catalogue.

Get a sample of this dataset to see real records with their complete field dictionary before you commit.

Four records exactly as the portal returns them — minus the pointers that lead back into each agency's own dossier system. Two describe the same substance, methanol (CAS 67-56-1): once as a classification entry from ECHA's C&L inventory with no study records attached, once as an endpoint-bearing record from Canada's Categorization Results. The third falls out of a boiling-point property query — formaldehyde, CAS 50-00-0, sourced from ECHA REACH study records. The fourth is an entry from the GHS classification catalogue itself.

SUBSTANCE SEARCH — methanol
| SUBSTANCE | CAS RN  | PARTICIPATING SOURCE | MATCH LEVEL | ENDPOINT DATA |
| --------- | ------- | -------------------- | ----------- | ------------- |
| Methanol  | 67-56-1 | ECHA C&L inventory   | 1           | no            |
| Methanol  | 67-56-1 | CCR                  | -           | yes           |

PROPERTY SEARCH — boiling point
| SUBSTANCE    | CAS RN  | CHAPTER       | ENDPOINT KIND | SOURCE     |
| ------------ | ------- | ------------- | ------------- | ---------- |
| formaldehyde | 50-00-0 | Boiling point | BoilingPoint  | ECHA REACH |

GHS CLASSIFICATION CATALOGUE
| CODE | ABBREVIATION | TEXT               | CATEGORY                                              |
| ---- | ------------ | ------------------ | ----------------------------------------------------- |
| 7007 | Flam. Gas 1A | Flammable gases 1A | Flammable gases (including chemically unstable gases) |

Same identifier, different depth per contributor. That asymmetry is the portal's defining texture — and the reason one normalized copy beats thirty-four separate lookups.

Ten fields ride along with every substance record, from the contributor's own spelling of name down to substance_id, the portal's internal handle for a record inside a given source. The level field grades how literal the name-to-number binding is — 1 marks a high-confidence pairing, 2 a broader match. An eleventh field carries a pointer back to the contributing agency's own dossier view; because it resolves inside each agency's systems rather than the shared record, it ships as one of the additional fields available on request.

The dictionary below is the complete core set.

Property queries walk a structured endpoint tree in four families. Physical and chemical properties run from melting and boiling point through density, granulometry, vapour pressure, water solubility, octanol-water partitioning, flash point, auto flammability and viscosity. Environmental fate and pathways cover phototransformation, hydrolysis, biodegradation, bioaccumulation, adsorption and desorption, and Henry's Law constants. Ecotoxicological endpoints span aquatic, sediment and terrestrial compartments. Toxicological endpoints climb the whole ladder — acute toxicity by route, irritation, sensitisation, repeated dose, genetic toxicity, carcinogenicity, reproductive toxicity.

Depth is uneven by design: four contributors submit searchable endpoint studies — Canada's CCR, ECHA CHEM, Japan's J-CHECK and the OECD SIDS IUCLID collection — and ECHA CHEM alone accounts for 911,173 of the portal's 1,136,073 endpoint records, spread over just 20,906 substances.

• Geography: global aggregation across OECD members and partners — EU/ECHA, US EPA, Canada, Japan, Australia, Germany, France, the Nordic countries, New Zealand and the UK sit side by side in one result set.
• Temporal: revision activity documented through May 2026, when the portal's news log recorded an ECHA REACH data refresh; per-source counts are published as a census snapshot rather than running totals.
• Granularity: substance identity records plus individual endpoint study records, one row per substance per contributing database — so a single CAS number fans out across as many sources hold it.

Your call, not ours: API, files, or your warehouse. Daily, weekly, or hourly.

Every delivery ships the complete field dictionary above, the sample rows, and the coverage profile — mapped and ready, with no integration archaeology on your side.

1. Market researchers mapping chemical portfolios and hazard profiles across a dozen jurisdictions without stitching together national websites.
2. Data scientists joining property and classification attributes onto an internal substance master, keyed on CAS number.
3. Competitive intel and product teams tracking which substances carry which GHS classifications where — a leading indicator of reformulation pressure.
4. Investors and quants reading classification churn across jurisdictions as a regulatory-cost signal for chemical producers.
5. Journalists and academics citing hazard classifications with a provenance trail back to the contributing agency, not an anonymous aggregator.

eChemPortal tells you what a substance is and how it is classified; the quantitative layer lives elsewhere. The Toxics Release Inventory reports what US facilities actually emit, the European Industrial Emissions Portal mirrors that for Europe's largest plants, and the TSCA inventory fixes the boundary of the US commercial substance list. Pair the classification picture with emission volumes and you get the full exposure story.

Notes and adjacent reading:

• NIST Chemistry WebBook — measured thermochemical and thermophysical constants for over 7,000 compounds; deeper than any single aggregated endpoint record.
• NOAA CAMEO Chemicals — response-oriented datasheets for thousands of hazardous substances, with mixing reactivity predictions.
• EPA Toxics Release Inventory (TRI) — annual facility-level releases to air, water and land.
• EPA TSCA Chemical Substance Inventory — the US commercial substance list to reconcile your portfolio against.
• EEA European Industrial Emissions Portal (E-PRTR) — Europe's facility-level pollutant releases and waste transfers.

Browse the whole vertical on the Commodity Chemicals industry hub or the ranked shortlist of the best commodity chemicals datasets.