SDS Section 4: First-aid measures

What OSHA requires in Section 4

OSHA enforces the content of Section 4 under the Hazard Communication Standard.

Appendix D requires Section 4 to contain:

• A description of the necessary first-aid measures, subdivided by route of exposure: inhalation, skin contact, eye contact and ingestion.
• The most important symptoms and effects, both acute and delayed.
• An indication of the need for immediate medical attention and, if necessary, special treatment.

Appendix D does not prescribe the wording. In practice, good sheets write the instructions so that a person who is not a medical professional can follow them, and say what to do first and what not to do, for example "do not induce vomiting".

GHS Annex 4 and international differences

GHS Annex 4 uses the same structure and says the section should describe initial care that an untrained responder can give without sophisticated equipment, state whether medical attention is needed and how urgently, and cover delayed as well as immediate effects. Where appropriate it asks for information on clinical testing and medical monitoring for delayed effects, known antidotes and contraindications.

In the EU, the REACH Annex II format follows the same approach and also covers the protection of first-aiders. Some suppliers add a short "note to physician" for clinicians; that is common practice even where it is not mandatory.

What to look for and red flags

What to look for

• Concrete actions: how long to rinse eyes, what to remove, where to move the person. Vague phrases such as "seek medical advice" are not enough on their own.
• Delayed symptoms. Some exposures feel fine for hours and then cause serious problems. If the sheet mentions delayed effects, plan for medical observation rather than relying on how the person feels.
• What not to do, such as inducing vomiting or neutralizing with another chemical.
• The poison centre or emergency number. In the US the national Poison Help line is 1-800-222-1222.

Red flags

• Identical first-aid text for every product in a family, even though the hazards differ.
• No instructions for one of the four routes of exposure that is plausible for the product.
• Advice that contradicts the hazards in Section 2, such as water rinsing for a water-reactive material without any caveat.
• No mention of delayed effects for a product classified with serious toxicity.

Worked example: typical fields

An illustrative layout. For wording based on public data, compare the first-aid section of the methanol page; always use the instructions on the supplier's own sheet.

Inhalation

Move to fresh air, keep at rest, call a physician or poison centre if symptoms occur

Skin contact

Remove contaminated clothing, rinse skin with water for the time stated, get medical help if irritation or other symptoms persist

Eye contact

Rinse with water for several minutes, remove contact lenses if easy to do, continue rinsing, call a physician

Ingestion

Rinse mouth; whether to induce vomiting or give anything to drink depends on the product, so follow the sheet

Symptoms

Acute and delayed effects in plain language

Note to physician

Specific treatment, antidote or monitoring, if any

See how this looks on a real page: methanol safety data, first-aid measures section. Every chemical page uses these 16 sections with the same anchors, so you can compare any substance.

Common mistakes

• Doing the generic thing. Standard advice such as "induce vomiting" is dangerous for corrosives and many solvents. Follow the specific sheet.
• Stopping eye rinses early. Rinsing too briefly is a frequent cause of avoidable injury. Use the duration given and keep going while help arrives.
• Not sending the SDS with the patient. Medical staff can treat better when they know the product and its ingredients.
• Keeping first-aid sheets only on a computer. Section 4 needs to be reachable when the network is down or the person who knows the password is absent.
• Assuming symptoms define severity. A person who feels recovered may still need monitoring when the sheet mentions delayed effects.

How Section 4 relates to other sections

Section 4 puts the toxicology in Section 11 into action: the symptoms listed here should match the effects documented there. The protective equipment first aiders should wear is in Section 8, and spill clean-up that might expose them is in Section 6. For fires, see Section 5. Keep Section 1's emergency number next to your first-aid kit.

Frequently asked questions