SDS Section 7: Handling and storage

The section that covers the ordinary day

Sections 4, 5 and 6 describe things going wrong. Section 7 describes nothing going wrong at all — the drum on the shelf, the operator who opens it every morning, the pump that moves it into a smaller vessel. It is the only part of the sheet written for the 364 days a year on which the product behaves exactly as expected, and that is where most of the accumulated risk actually sits.

REACH Annex II states the purpose plainly: this section shall provide advice on safe handling practices, emphasising precautions appropriate to the identified uses referred to under subsection 1.2 and to the unique properties of the substance or mixture. It then adds a duty the neighbouring sections do not carry — the information shall assist the employer in devising suitable working procedures and organisational measures according to Article 5 of Directive 98/24/EC and Article 5 of Directive 2004/37/EC. Section 7 is not written for the reader in the middle of an incident. It is written for the person drafting the standard operating procedure, weeks earlier, at a desk.

7.1 — what “precautions for safe handling” has to say

Four obligations, not one paragraph

Subsection 7.1.1 sets out four things the recommendations must do, and they are genuinely different questions.

(a) Allow safe handling. The Annex names its own examples: containment, and measures to prevent fire as well as aerosol and dust generation. That last pair matters — a powder that is unremarkable in a sealed sack becomes a different hazard the moment it is tipped, and the tipping is what 7.1 is about.

(b) Prevent handling of incompatible substances or mixtures. Note the verb. This is the bench, the transfer line and the mixing vessel, not the store. Storage incompatibility is dealt with separately, under 7.2.

(c) Draw attention to operations and conditions which create new risks by altering the properties of the substance or mixture — and to the appropriate countermeasures. This is the subtlest of the four and the one most often left blank. Heating, diluting, grinding, decanting and spraying all change what the product is, and the classification in section 2 describes only the product as supplied.

(d) Reduce the release of the substance or mixture to the environment — the Annex’s examples being avoiding spills and keeping away from drains. This is the environmental limb, and it is why the section’s own scope sentence says the information shall relate to human health, safety and the environment.

The UN text at A4.3.7.1.1 asks for the same four things, with “minimizes” in place of “reduce”. A supplier writing to the GHS and a supplier writing to REACH are answering an identical set of questions here.

The hygiene lines are a requirement, not filler

Do not eat, drink or smoke in work areas. Wash hands after use. Remove contaminated clothing and protective equipment before entering eating areas. Those three sentences appear on almost every sheet in existence and are read as boilerplate by almost everyone.

They are not optional. Subsection 7.1.2 says advice on general occupational hygiene shall be provided, and the three examples above are the Annex’s own wording. UN GHS Annex 4 is softer — A4.3.7.1.2 calls it good practice and offers the same three phrasings — and OSHA’s Appendix D does not itemise hygiene at all.

The boilerplate reading is also the wrong one. Hand-to-mouth transfer and take-home contamination are the exposure routes engineering controls do not touch — which is why they sit in section 7 rather than section 8.

7.2 — storage, and the limits of the word “incompatibilities”

The EU heading is “Conditions for safe storage, including any incompatibilities”, and the text behind it runs to four lettered groups and eighteen sub-items — risks to manage, ambient effects to control, integrity to maintain, and a closing list covering ventilation, vessel design, quantity limits and packaging.

Read a typical sheet against that. “Store in a cool, dry, well-ventilated place away from incompatible materials” answers none of the eighteen: no temperature, no vessel design, no quantity limit, no packaging material, and no named incompatibility.

One wording difference is worth flagging, because it changed. UN GHS Annex 4 asks how to avoid those six conditions. Regulation (EU) 2020/878 asks how to manage risks associated with them. Avoidance is binary and often impossible — a corrosive stored anywhere is stored in corrosive conditions. Management is a judgement, and a judgement has to be described.

What a supplier’s section 7 cannot know

Here is the honest limit of the section. Section 7 describes one product, in isolation. The supplier knows the chemistry of what they sold you. They have no idea what else is in your store.

So “keep away from oxidising agents” is a true statement about the product and a useless one about your cabinet, because it does not tell you whether the three containers next to it are oxidising agents, or whether the acid two shelves down would react with any of them. That is a pairwise question asked across an entire inventory, and no safety data sheet is capable of answering it — nothing in Annex II or Appendix D even asks the supplier to try.

It is, however, a question that can be computed. The chemical storage compatibility checker takes the CAS numbers you actually hold and returns a verdict for each pair across 3 600+ substances; the storage compatibility classes behind it set out why each family behaves as it does, from flammable liquids through oxidisers and water-reactives. Section 7 is an input to a store plan. It is not the plan.

Storage advice has to agree with section 9

Annex II is explicit: the advice provided shall be consistent with the physical and chemical properties described in section 9. That one sentence makes 7.2 checkable without any laboratory work.

A recommended storage temperature above the flash point contradicts section 9. A “protect from moisture” line on a product section 9 records as freely water-miscible, with nothing in section 10 about water reactivity, contradicts it the other way. Where the two disagree, one of them is wrong.

Where the two systems part company

7.3 Specific end use(s) — EU only. REACH gives section 7 a third subsection that neither Annex 4 nor Appendix D has. For substances and mixtures designed for specific end uses, the recommendations shall relate to the identified uses in subsection 1.2 and be detailed and operational. Where an exposure scenario is attached, 7.3 may refer to it instead of repeating 7.1 and 7.2; where a supply chain actor has assessed the mixture, consistency with the chemical safety report for the mixture is sufficient, rather than with the reports for each substance in it. This is the hinge between the sheet and REACH’s exposure scenario machinery: the point at which section 7 stops being generic advice and becomes advice about one declared use.

The US dagger. Table D.1 gives section 7 two lines and no sub-items, but the row carries a footnote, and the footnote is a real US-only obligation. The boiling point used to determine the appropriate flammable liquid storage container size and type shall be determined by § 1910.106(a)(5); where an alternate calculation was used for storage purposes and the resulting classification for storage differs from the one listed in section 2, that must be clearly noted in sections 7 and 9. A US sheet can therefore carry two flammability classifications on purpose — one for the hazard, one for the store — and section 7 is where the difference is declared.

How section 7 connects to the rest of the sheet

• The identified uses declared in section 1 are what 7.1 and 7.3 are measured against. Advice not tied to a declared use satisfies neither.
• The classification in section 2 decides which of 7.2’s eighteen sub-items are live — and under the US footnote, section 2’s classification may deliberately differ from the storage one.
• Section 6 is what happens when 7.1 fails. The environmental duty is the same in both: 7.1.1(d) asks you to keep the product away from drains, section 6 tells you what to do once it has reached one.
• Annex II says relevant information may also be found in section 8, and 8.2.1 requires the engineering controls there to complement section 7 rather than repeat it. Ventilation described twice, differently, fails both.
• The physical data in section 9 is the consistency test 7.2 is explicitly measured against.
• The incompatible materials and conditions to avoid in section 10 are the chemistry behind 7.2’s storage advice. OSHA lists them as items (d) and (e) of its section 10; if 7.2 and section 10 name different things, one was written without the other.

What a good section 7 looks like

Three tests, all answerable by reading:

1. Is there a number anywhere in 7.2? A temperature range, a quantity limit, a container material. Storage advice with no quantities in it has not engaged with 7.2(b) or 7.2(d).
2. Does 7.2 name what to keep the product away from — by class or by substance? “Incompatible materials” is a placeholder, not an answer. The heading of the subsection contains the word incompatibilities precisely because naming them is the point.
3. Do 7.2, section 9 and section 10 tell the same story? The storage temperature, the flash point and the conditions to avoid come from one body of data. Where they diverge, the sheet was assembled rather than written.