Use this reference guide on the GHS hierarchy of hazard statements, pictograms and signal words in conjunction with the Reference Guide to GHS Container Labels to create a Globally Harmonized System (GHS)-compliant label for a chemical mixture. Each mixture component's Safety Data Sheet (SDS) should be used with this guide to determine required label elements for a mixture.
- If two chemicals in a mixture present different levels of hazard within the same hazard class, this hierarchy will determine which hazard is represented on the label.
- If only one chemical in a mixture is considered hazardous (with all others classified as “non-hazardous” under the GHS), use the hazard information (e.g. pictogram, hazard statements, signal word) from the hazardous chemical’s SDS to create your label.
The information in Appendix A are organized by GHS hazard classes (e.g. Flammable Liquids, Acute Toxicity – Skin Contact). They present the hazard statements within each class, along with applicable signal words and pictograms in order of high hazard to low hazard. Follow the steps below to use these tables:
- Identify which table(s) the hazard statements listed on the chemicals’ SDSs apply to.
- If two or more hazard statements fall within the same table, choose the hazard statement with the highest degree of hazard (i.e. choosing “fatal if swallowed” in row 1, over “harmful if swallowed” in row 3) to be written on the mixture label.
- Once the appropriate hazard statement is chosen, identify the appropriate pictogram and signal word from the same row of the table.
- Use the chemical’s SDS to identify the appropriate precautionary statements for each hazard statement and include them on your container label.
If a hazard statement is not listed below, it does not follow a hierarchy and must be displayed on your label.
If the chemicals in your mixture use both “Danger” and “Warning,” only “Danger” needs to be displayed.
- Note that some pictograms (e.g. skull and crossbones and exclamation mark) apply to multiple hazard classes.
- Each pictogram and signal word only needs to be represented once.
When the hierarchy needs to be implemented, the following precedence applies for pictograms that should be displayed on the label:
- If the skull and crossbones applies, the exclamation mark should not appear;
- If the corrosive symbol applies, the exclamation mark should not appear when it is used for skin or eye irritation;
- If the health hazard symbol applies for respiratory sensitization, the exclamation mark should not appear for skin sensitization or for skin or eye irritation.
Two examples of properly labeled mixtures are included below, with explanations on how hierarchial decisions were made.
Example Mixture 1
![GHS Hierarchy Example Mixture 1 Table GHS Hierarchy Example Mixture 1 Table](/sites/default/files/styles/media_responsive_widest/public/ghs_hierarchy_example_mixture_1_table.jpg?itok=2ofOQdPO)
![GHS Hierarchy Example 1 Label GHS Hierarchy Example 1 Label](/sites/default/files/styles/media_responsive_widest/public/ghs_hierarchy_example_1_label_0.jpg?itok=jNeRLSq1)
Example Mixture 2
![Reference Guide to GHS Hierarchy Example Mixture 2 Reference Guide to GHS Hierarchy Example Mixture 2](/sites/default/files/styles/media_responsive_widest/public/reference_guide_to_ghs_hierarchy_example_mixture_2_v_2.jpg?itok=nDpXqQqD)
![GHS Hierarchy Example 2 Label GHS Hierarchy Example 2 Label](/sites/default/files/styles/media_responsive_widest/public/ghs_hierarchy_example_mixture_2_label.jpg?itok=BEVWC8Um)
Note: All components of this label were combined from both Chemical C and Chemical D; there was no hierarchy to implement.
Appendix A: Hazard Class Tables
Acute Toxicity - Oral
![Acute Toxicity Oral Hazard Class Table Acute Toxicity Oral Hazard Class Table](/sites/default/files/styles/media_responsive_widest/public/acute_toxicity_oral_hazard_class_table.jpg?itok=6GAuYxo_)
Acute Toxicity - Skin Contact
![Acute Toxicity Skin Contact Hazard Class Table Acute Toxicity Skin Contact Hazard Class Table](/sites/default/files/styles/media_responsive_widest/public/acute_tocixity_skin_contact_hazard_class_table.jpg?itok=jRrOz3HL)
Acute Toxicity - Inhalation
![Acute Toxicity Inhalation Hazard Class Table Acute Toxicity Inhalation Hazard Class Table](/sites/default/files/styles/media_responsive_widest/public/acute_toxicity_inhalation_hazard_class_table.jpg?itok=Orx-7bIO)
Skin Corrosion & Irritation
![GHS Hierarchy Skin Corrosion and Irritation GHS Hierarchy Skin Corrosion and Irritation](/sites/default/files/styles/media_responsive_widest/public/skin_corrosion_and_irritation.jpg?itok=4I7AQv7j)
Serious Eye Damage & Eye Irritation
![Serious Eye Damage & Eye Irritation Hazard Class Table Serious Eye Damage & Eye Irritation Hazard Class Table](/sites/default/files/styles/media_responsive_widest/public/serious_eye_damage_and_eye_irritation_hazard_class_table.jpg?itok=dv_6u00o)
Some hazard classes (e.g. flammables, oxidizers, carcinogens) follow a GHS hierarchy for hazard statements and signal words, but the same pictogram is used to represent each hazard statement. The hierarchies for these situations are detailed in the tables below.
Flammable Liquid
![Flammable Liquid Hazard Class Table Flammable Liquid Hazard Class Table](/sites/default/files/styles/media_responsive_widest/public/flammable_liquid_hazard_class_table.jpg?itok=Uen9JYWO)
Flammable Gases
![Flammable Gases Hazard Class Table Flammable Gases Hazard Class Table](/sites/default/files/styles/media_responsive_widest/public/flammable_gases_hazard_class_table.jpg?itok=a2lIdx3A)
Flammable Aerosols
![Flammable Aerosols Hazard Class Table Flammable Aerosols Hazard Class Table](/sites/default/files/styles/media_responsive_widest/public/flammable_aerosols_hazard_class_table.jpg?itok=kHVjCocf)
Flammable Solids
![Flammable Solids Hazard Table Class Flammable Solids Hazard Table Class](/sites/default/files/styles/media_responsive_widest/public/flammable_solids_hazard_table_class.jpg?itok=L3KPzvSG)
Self-heating Substances and Mixtures
![Self Heating Subtances Hazard Class Table Self Heating Subtances Hazard Class Table](/sites/default/files/styles/media_responsive_widest/public/self_heating_subtances_hazard_class_table.jpg?itok=iWscP5Jb)
Substances and Mixtures that, in Contact with Water, Emit Flammable Gases
![Substances and Mixtures that, in Contact with Water, Emit Flammable Gases Hazard Class Table Substances and Mixtures that, in Contact with Water, Emit Flammable Gases Hazard Class Table](/sites/default/files/styles/media_responsive_widest/public/subtances_emit_flammable_gas_with_water_hazard_class_table.jpg?itok=zwljikWt)
Oxidizing Liquids & Oxidizing Solids
![Oxidizing Liquids & Oxidizing Solids Hazard Class Table Oxidizing Liquids & Oxidizing Solids Hazard Class Table](/sites/default/files/styles/media_responsive_widest/public/oxidizing_liquids_and_solids_hazard_class_table.jpg?itok=nhPS-liy)
Germ Cell Mutagenicity
![Germ Cell Mutagenicity Hazard Class Table Germ Cell Mutagenicity Hazard Class Table](/sites/default/files/styles/media_responsive_widest/public/germ_cell_mutagenicity_hazard_class_table.jpg?itok=6P5WH72h)
Carcinogenicity
![Carcinogenicity Hazard Class Table Carcinogenicity Hazard Class Table](/sites/default/files/styles/media_responsive_widest/public/carcinogenicity_hazard_class_table.jpg?itok=wA8tAEb5)
Reproductive Toxicity
![Reproductive Toxicity Hazard Class Table Reproductive Toxicity Hazard Class Table](/sites/default/files/styles/media_responsive_widest/public/reproductive_toxicity_hazard_class_table.jpg?itok=b60JQjyG)
Specific Target Organ Toxicity, Single Exposure
![Specific Target Organ Toxicity Single Exposure Hazard Class Table Specific Target Organ Toxicity Single Exposure Hazard Class Table](/sites/default/files/styles/media_responsive_widest/public/specific_target_organ_toxicity_single_exposure_hazard_class_table.jpg?itok=YZR5SleY)
Specific Target Organ Toxicity, Repeated Exposure
![Specific Target Organ Toxicity Repeated Exposure Hazard Class Table Specific Target Organ Toxicity Repeated Exposure Hazard Class Table](/sites/default/files/styles/media_responsive_widest/public/specific_target_organ_toxicity_repeated_exposure_hazard_class_table.jpg?itok=OEF5_6Si)