Reclassify a hazardous concentrate after dilution with water. Pick the CLP classification from the SDS, slide the dilution percentage, and see the new hazard category live — plus the EMKG skin and inhalation hazard groups for workplace control banding.
All inputs come from the concentrate's SDS — the dilution itself is the value you enter.
Slide for a quick read, or type a precise value above. Specific concentration limits from CLP are not applied.
For each hazard class, the calculator picks the band the dilution falls into and shows the resulting CLP classification — or "Not classified" if the dilution dropped below the lowest band.
Each row also returns a workplace skin and inhalation hazard group. The summary card aggregates the highest group across all hazards in one place.
Special footnotes for Skin Corr./Eye Dam. (pH), Resp. Sens. (gases), and Aspiration (viscosity) are surfaced inline so you do not have to memorise them.
Health hazards are split into two parallel scales used by the BAuA EMKG scheme: Skin running HA to HE, and Inhalation running A to E. In both, severity increases from the first letter to the last. The pair feeds the workplace control-banding step where the required protective measures are picked.
Whenever a hazardous concentrate is diluted with water before use, its CLP classification can change. This tool lets you check the new classification quickly, so the workplace risk assessment, label and SDS for the diluted product reflect reality.
Industrial and professional cleaners are typically supplied at 100% and diluted at 1:10 to 1:200 in water. Check whether the use-dilution is still Skin Corr. 1 or drops to Skin Irrit. 2.
Glutaraldehyde, peracetic acid and quat-based disinfectants are diluted before use. The simplified scheme gives a quick read on the diluted Acute Tox., Skin Sens. and Eye Dam. categories.
Process-water additives are dosed at 0.1–5%. Many drop below the lowest band entirely — useful to demonstrate "not classified" in the workplace assessment.
Stock solutions diluted in-house need an internal classification. The calculator covers Acute Tox. 1–4, sensitisation, CMR, STOT and aspiration in one place.
Suppliers express dilutions in different ways. Use this conversion as a shortcut between a ratio on the product label and the weight percentage the calculator expects (densities close to water).
| Ratio | Concentrate | Water | % (w/w) |
|---|---|---|---|
| 1:1 | 1 part | 1 part | 50% |
| 1:4 | 1 part | 4 parts | 20% |
| 1:9 | 1 part | 9 parts | 10% |
| 1:19 | 1 part | 19 parts | 5% |
| 1:49 | 1 part | 49 parts | 2% |
| 1:99 | 1 part | 99 parts | 1% |
| 1:999 | 1 part | 999 parts | 0.1% |
The dilution thresholds and the skin / inhalation hazard groups implemented here come from the EMKG (Einfaches Maßnahmenkonzept Gefahrstoffe), a workplace control-banding scheme published by BAuA, the German Federal Institute for Occupational Safety and Health. The specific table is derived from TRGS 201 Annex 2 ("Vereinfachte Einstufung bei Informationsdefiziten").
Original publication including the water-dilution table for hazardous substances (German).
VisitTechnische Regel für Gefahrstoffe 201 — classification and labelling of hazardous substances at the workplace, with Annex 2 covering simplified classification.
VisitDisclaimer: Implementation of the EMKG dilution table from BAuA (September 2023), derived from TRGS 201 Annex 2. For workplace use only, not for placing chemicals on the market. Always verify against the current regulatory text and consult a qualified chemical safety adviser when in doubt.
