Classify a chemical mixture

Classify chemical mixtures according to CLP Regulation (EC) No 1272/2008. Enter your mixture's components with their hazard data, and NextSDS calculates the combined classification: H-phrases, P-phrases, GHS pictograms, and signal words.

Describe the mixture

Start with the basic properties of your mixture in Step 1: Mixture Information:

1. Enter a Mixture Name (required).
2. Select the Physical State: Solid, Liquid, Gas, or Aerosol.
3. Select the User Type: General (Consumer), Industrial, or Professional. This determines which precautionary statements (P-phrases) apply to the final label.
4. Optionally enter the Flash Point, Boiling Point, and pH if known. These refine the physical hazard classification.
5. Select Next to proceed.

Add the mixture components

In Step 2: Components, enter each substance that makes up the mixture.

1. Enter the Substance Name and CAS Number for the first component.
2. Set the Concentration (%). The total across all components must not exceed 100%.
3. Enter Health H-Phrases, Environmental H-Phrases, and Physical H-Phrases as comma-separated codes (e.g. H314, H318, H335).
4. Select the relevant GHS pictograms.
5. Select Add Component to add more substances. Repeat for each component.

Enter toxicity data

For more precise classification, expand the additional sections on each component.

These fields are optional and only needed for precise classification:

• Acute Toxicity (ATE Values): enter oral, dermal, and inhalation values if available from the SDS. These are used to calculate acute toxicity categories for the mixture.
• M-Factors: enter acute and chronic M-factors for substances that are very toxic to aquatic organisms. M-factors increase the weight of a component in the environmental classification.
• Specific Concentration Limits (SCL): enter any substance-specific concentration limits that override the generic CLP thresholds.
• Ecotoxic Parameters: enter aquatic toxicity test results (LC50, EC50, NOEC) for accurate environmental hazard classification under CLP Annex I, Part 4.1.
• CLP 2026 & REACH Properties: mark endocrine disruptor categories, persistence flags (PBT, vPvB, PMT, vPvM), and REACH regulatory status. This includes Substance of Very High Concern, Annex XIV authorisation, and Annex XVII restrictions.

Review before classifying

Step 3: Overview shows a summary of everything you entered: mixture properties, component list with concentrations, and a key data indicator for each component.

Verify that the component concentrations add up correctly and that the hazard data looks complete before proceeding.

Read the classification results

Select Step 4: Classification to run the calculation. NextSDS returns the full CLP classification in two sections:

Section 2.2: Label elements

This is what goes on the product label and in Section 2.2 of your SDS:

• GHS pictograms: the pictograms required on the label after applying CLP precedence rules (Article 26)
• Signal word: "Danger" or "Warning"
• Hazard statements: H-codes grouped by health, environmental, and physical hazards, after CLP label supersession rules have been applied
• Precautionary statements: P-codes for prevention, response, storage, and disposal

Section 2.1: Full classification

The complete classification before supersession rules, for SDS Section 2.1. This may contain more H-codes than the label section, because some hazard statements supersede others on the label but must still appear in the SDS.

Composition and audit trail

The results also include the mixture composition table and a Classification Audit Trail. The audit trail records every calculation step: which concentration thresholds were checked, which CLP rules were applied, and whether each hazard class was triggered or not. Keep this as evidence for regulatory inspections.