P-Statements Explained: GHS Codes, Meanings & COSHH

Precautionary statements, known as P-statements, are the standardised phrases on a chemical label and safety data sheet that tell you how to handle, store, and respond to a hazardous substance. Each has a code made of the letter P and three digits, such as P280 or P102, and each describes a recommended safety measure rather than the hazard itself. In Great Britain they come from the GB CLP Regulation, which puts the United Nations GHS into law, and they map directly onto the control measures in a COSHH risk assessment.

What are P-statements on a safety data sheet?

P-statements are the precautionary phrases assigned to a hazardous chemical under the GHS and CLP systems, describing the measures a user should take to reduce or prevent harm. They sit alongside hazard statements (H-statements), which describe what the hazard actually is. A single product often carries several P-statements covering prevention, first response, safe storage, and disposal. On a UK safety data sheet you find them in Section 2, Hazard identification, as part of the label elements.

The standard wordings are fixed and centrally listed, so the same code means the same thing on any compliant label. Precautionary statements are listed in Annex IV of the GB CLP Regulation, and hazard statements in Annex III. This is what makes the codes useful: P280 carries the same recommended precaution whoever the manufacturer is.

What is the difference between an H-statement and a P-statement?

The difference is straightforward: an H-statement tells you the hazard, and a P-statement tells you what to do about it. Hazard statements describe the nature, and where relevant the degree, of a hazard. Precautionary statements recommend actions, such as wearing eye protection or rinsing the eyes after contact. Both appear together in Section 2 of the SDS and on the physical container label, underneath the pictograms and signal word.

How are P-statement codes structured?

Every P-statement code is the letter P followed by three digits, and the first digit tells you which category the advice belongs to. GHS groups precautionary statements into five families by that first digit, which lets you scan a long list quickly and sort the advice by what it is for.

What do combined P-statements like P305+P351+P338 mean?

Combined P-statements join two or more single statements with a plus sign to form one continuous instruction. P305+P351+P338, for example, reads as a single first-aid sequence for eye contact: if in eyes, rinse cautiously with water for several minutes, remove contact lenses if present and easy to do, then continue rinsing. Manufacturers use these combinations to keep a crowded label concise while still spelling out a full sequence of actions. When you record controls, expand each combined statement back into its separate steps so nothing is lost.

Where do P-statements appear on an SDS, and are they the full story?

P-statements appear in Section 2 of the safety data sheet, Hazard identification, within the label elements. That section is a summary, not the full detail. The practical instructions behind each P-statement are expanded elsewhere in the 16-section SDS, which in the UK follows the format required under REACH: handling and storage sit in Section 7, and personal protective equipment and exposure controls sit in Section 8. Reading the P-statements together with Sections 7 and 8 gives you the real control measures rather than the shorthand codes alone.

How do P-statements feed into a COSHH risk assessment?

P-statements are a starting point for a COSHH risk assessment, not a replacement for one. COSHH, the Control of Substances Hazardous to Health Regulations 2002, requires an employer to assess the risk from each hazardous substance and decide on adequate controls for the way it is actually used on site. The P-statements on the SDS give you the manufacturer's baseline precautions, and each category lines up neatly with part of the assessment.

The gap that P-statements cannot close is context. A label does not know your ventilation, your quantities, your task frequency, or who is exposed, so COSHH asks you to judge whether the generic precaution is enough or whether you need more, such as local exhaust ventilation or a change of process COSHH regulation 6 requires a suitable and sufficient assessment; this interpretation step is where building an assessment by hand gets slow, because every product's H and P codes have to be read, decoded, and mapped to the specific task. Software that reads the SDS and drafts the assessment, such as Safe Foundry's SDS-to-COSHH workflow, extracts the H and P statements from Section 2 and turns each into a suggested control, which a competent person then reviews and adapts. You can see the features that read hazard and precautionary statements automatically if that mapping is the part eating your time.

How should you use P-statements in practice?

Work through the codes in a fixed order so nothing is missed, then record what you decide.

1. Read the H-statements first to understand the hazard, then read the P-statements for the precautions.
2. Group the P-statements by category: prevention, response, storage, and disposal.
3. Cross-check each precaution against Sections 7 and 8 of the SDS for the underlying detail.
4. Judge whether the generic precaution is adequate for your actual task, quantity, and setting, and add stronger controls where it is not.
5. Record the resulting controls in your COSHH assessment and communicate them to the people doing the work.

Reading P-statements well is the first step in a COSHH assessment you can defend, and it stays a matter of judgement, not just copying codes across. If you handle many products, you can browse practical COSHH and SDS guides in the help centre for worked examples. This article is general guidance and not a substitute for professional or legal advice on your specific substances and processes.