---
title: "Storage of acids and bases: what to keep apart"
description: "Storage of acids and bases from the countertop chemical resistance table: 10 of 17 have a corrosive CLP pictogram. Nitric acid stands apart. Test date unknown."
canonical_url: "https://www.renggli.pl/en/blog/storage-of-acids-and-bases"
language: "en"
published: "2026-10-15"
last_updated: "2026-10-15"
alternates:
  pl: "https://www.renggli.pl/pl/blog/przechowywanie-kwasow-i-zasad.md"
  de: "https://www.renggli.pl/de/blog/saeuren-und-laugen-lagern.md"
  uk: "https://www.renggli.pl/uk/blog/zberihannia-kyslot-i-luhiv.md"
  lt: "https://www.renggli.pl/lt/blog/rugsciu-ir-sarmu-laikymas.md"
---

# Storage of acids and bases: what to keep apart

> Storage of acids and bases from the countertop chemical resistance table: 10 of 17 have a corrosive CLP pictogram. Nitric acid stands apart. Test date unknown.

Published 2026-10-15 · Category: [Cabinets and chemical storage](https://www.renggli.pl/en/blog/category/cabinets-and-chemical-storage) · Author: [Renggli Team](https://www.renggli.pl/en/blog/author/zespol-renggli) · 11 min read

Post tags: [CLP Regulation](https://www.renggli.pl/en/blog/tag/clp-regulation), [Chemical storage](https://www.renggli.pl/en/blog/tag/chemical-storage), [Nitric acid](https://www.renggli.pl/en/blog/tag/nitric-acid), [Hydrofluoric acid](https://www.renggli.pl/en/blog/tag/hydrofluoric-acid)

Storage of acids and bases in a laboratory starts with an inventory of bottles, not with choosing a cabinet. The [countertop](https://www.renggli.pl/en/offer/laboratory-countertops) chemical resistance table, which laboratories use when choosing a countertop, lists 17 acids and bases (test date unknown; this concerns the countertop resistance test in the source table). An inventory of the bottles at a workstation makes it easier to choose [chemical storage cabinets](https://www.renggli.pl/en/offer/safety-storge-cabinets) and to write the workstation instruction.

**Key points**

- The corrosive pictogram (GHS05) appears in the entry of 10 reagents, and the skull pictogram (GHS06) in that of 3.
- The oxidiser pictogram (GHS03) appears in the entry of only 2 reagents, and so does the flame pictogram (GHS02).
- For 8 of the 17 reagents the entry carries Note B, so only the safety data sheet describes the hazards of the solution on the shelf.
- The CIOP-PIB booklet lists concentrated sulfuric acid and organic compounds, such as the glacial acetic acid from the list, among the substances that must not be stored together with concentrated nitric acid.

## Which acids and bases on the list have a CLP entry? {#which-acids-and-bases-on-the-list-have-a-clp-entry}

The list of acids and bases in the countertop chemical resistance table runs from citric to hydrofluoric acid, and the bases are two sodium hydroxide solutions and two ammonia solutions.

The corrosive pictogram is the most common in the entries: 10 reagents on the list have it. The numbers in the pictogram table below do not add up to 17, because one reagent can have several pictograms.

**Reference table of a closed list: the number of reagents whose selected Annex VI CLP entry has the given pictogram; one reagent can have several pictograms; n = 17 acids and bases from the countertop chemical resistance table (full list); a pictogram describes the entry of the substance, not the solution on the shelf; test date unknown, dataset version 2026-10-15, entries read through PubChem on 2026-10-15**

| Pictogram in the entry | Reagents on the list (n = 17) |
| --- | ---: |
| Corrosive (GHS05) | 10 |
| Toxic (GHS06) | 3 |
| Oxidising (GHS03) | 2 |
| Flammable (GHS02) | 2 |
| Health hazard (GHS08) | 0 |
| No selected entry | 6 |

Source: Countertop chemical resistance table and Annex VI to the CLP Regulation (read through PubChem), compiled by Renggli. Data: https://mom5efytyj47lt9h.public.blob.vercel-storage.com/przechowywanie-kwasow-i-zasad-2026-10-15-clp_entries.csv

The skull pictogram appears in the entry of 3 reagents, and each of them also has the corrosive pictogram. The oxidiser pictogram appears in one kind of entry only. It belongs to nitric acid, that is, the two nitric acid solutions on the list. The flame pictogram likewise appears in one kind of entry only. It belongs to acetic acid, that is, the two acetic acid solutions. Which reagent has which entry is shown by the full list in the section on the method.

6 reagents on the list have no selected entry. Chromic mixture is a mixture, so its hazards depend on its composition. For both ammonia solutions (ammonia 25% and ammonium hydroxide 28%) and for phosphoric acid an entry exists, but the selection rule did not match it. For chromic acid and oleic acid there is no entry under that name. In each of these cases the source is the supplier's safety data sheet.

## Why are acids and bases not stored side by side? {#why-are-acids-and-bases-not-stored-side-by-side}

An acid and a base react with each other, and the CIOP-PIB booklet recommends [separating chemicals that may react with each other](https://m.ciop.pl/CIOPPortalWAR/file/94632/Podstawowe_zasady_bezpiecznej_pracy_w_magazynach_chemikaliow-Domanski_2013.pdf) on the basis of data from the safety data sheet. This is the institute's recommendation for chemical warehouses, but the same principle is useful for a cabinet in a laboratory.

The same booklet gives a simple rule: packages marked with the same warning labels may be stored together. For acids and bases the rule is not enough, because an acid and a base often carry the same corrosive pictogram and still react with each other. That is why acids and bases stand on separate shelves or in separate spill trays, and the safety data sheet settles the rest.

For more on how to divide reagents into groups, see the article on [storing hazardous substances in a laboratory](https://www.renggli.pl/en/blog/storage-of-hazardous-substances-in-the-laboratory).

## Which acid needs a place of its own? {#which-acid-needs-a-place-of-its-own}

The booklet does not give the threshold above which an acid counts as concentrated, so whether a given solution from the list qualifies has to be checked in its safety data sheet. For concentrated nitric acid the table lists: ozone, oxidisers, hydroiodic acid, concentrated sulfuric acid, powdered metals, carbides, picrates, organic compounds and hydrogen sulfide. Acetic, citric and oleic acid from the list are organic compounds, so they should not stand next to concentrated nitric acid.

For concentrated sulfuric acid the same table lists, among others, nitric acid and hydrochloric acid. In practice, concentrated nitric acid and concentrated sulfuric acid stand apart from each other, and organic acids are kept away from concentrated nitric acid.

Acetic acid needs a closer look. Its entry also has the flame pictogram. Whether the flame applies to a specific solution (5% acetic acid or glacial acetic acid) is stated in its safety data sheet, and that decides whether the bottle goes into a flammable liquids cabinet. Hydrofluoric acid has a separate article, [hydrofluoric acid in the laboratory](https://www.renggli.pl/en/blog/hydrofluoric-acid). Its entry has the skull pictogram.

> **Warning: The distances in the booklet apply to warehouses**
>
> The CIOP-PIB booklet also gives distances and quantities for chemical warehouses. These are recommendations for a warehouse, not for a cabinet in a laboratory, so these values are not transferred directly to shelves.

## Storage of acids and bases: a checklist {#storage-of-acids-and-bases-a-checklist}

A division plan can be made from the list of reagents in five steps. Each step relies on the safety data sheet of the specific solution, because an Annex VI entry describes the substance, not the bottle.

1. **List the acids and bases at the workstation**

    Name, concentration from the label and supplier. Attach the current safety data sheet to each item.
2. **Copy the warning pictograms from the sheet**

    The corrosive, oxidiser, skull and flame pictograms. Packages with the same pictograms may stand together unless the sheet says otherwise, except for acids and bases (step three) and concentrated nitric acid (step four).
3. **Separate the acids from the bases**

    Separate shelves or separate spill trays, because an acid and a base react with each other.
4. **Set concentrated nitric acid apart**

    Away from oxidisers, concentrated sulfuric acid and organic compounds, including organic acids.
5. **Check items with several pictograms**

    A reagent that is corrosive and flammable, or corrosive and toxic, goes where its most serious hazard according to the safety data sheet requires.

When choosing a cabinet, the article on [how to choose laboratory cabinets for reagents](https://www.renggli.pl/en/blog/laboratory-reagent-cabinets-selection) is useful.

## Acids and bases from the resistance table: results, method and data {#acids-and-bases-from-the-resistance-table-results-method-and-data}

The list covers every acid and every base in the countertop chemical resistance table, that is, 17 reagents. The entries were read on 15 October 2026 from PubChem, for example from the [PubChem entry for nitric acid](https://pubchem.ncbi.nlm.nih.gov/rest/pug_view/data/compound/944/JSON?heading=GHS%20Classification), where nitric acid has two entries depending on the concentration of the solution. PubChem is the place the entries were read, not the text of the regulation.

A hazard group is a pictogram from the entry: oxidising, corrosive, toxic, flammable or health hazard. In the full list below, the group describes the entry of the substance, not the solution at the concentration given in the countertop resistance table. For 8 reagents the entry carries Note B, and the threshold limits of these entries (SCL) are not in the data.

**Full list: acids and bases from the countertop chemical resistance table, n = 17 reagents (13 acids, 4 bases); Annex VI CLP entry selected for the reagent, groups according to the pictograms of the entry: oxidising, corrosive, toxic, flammable, health hazard; a group describes the entry of the substance, not the solution on the shelf, and the SCL limits are not in the data; test date unknown, dataset version 2026-10-15, entries read through PubChem on 2026-10-15**

| Reagent | Type | Selected Annex VI entry | Hazard groups according to the entry | Note B in the entry |
| --- | --- | --- | --- | --- |
| Ammonia 25% | base | no | not applicable | not applicable |
| Chromic mixture (chromium mixture) | acid | no | not applicable | not applicable |
| Nitric acid 10% | acid | yes | oxidising, corrosive, toxic | yes |
| Nitric acid 65% (approx.) | acid | yes | oxidising, corrosive, toxic (solution close to the limit of the entry) | yes |
| Chromic acid 40% | acid | no | not applicable | not applicable |
| Citric acid 10% | acid | yes | none of the five groups | no |
| Hydrofluoric acid 48% | acid | yes | corrosive, toxic | yes |
| Phosphoric acid 85% | acid | no | not applicable | not applicable |
| Acetic acid 5% | acid | yes | corrosive, flammable | yes |
| Glacial acetic acid | acid | yes | corrosive, flammable | yes |
| Oleic acid | acid | no | not applicable | not applicable |
| Sulfuric acid 33% | acid | yes | corrosive | yes |
| Sulfuric acid 60% | acid | yes | corrosive | yes |
| Sulfuric acid 96% | acid | yes | corrosive | yes |
| Ammonium hydroxide 28% | base | no | not applicable | not applicable |
| Sodium hydroxide 10% | base | yes | corrosive | no |
| Sodium hydroxide 50% | base | yes | corrosive | no |

Source: Countertop chemical resistance table and Annex VI to the CLP Regulation (read through PubChem), compiled by Renggli. Data: https://mom5efytyj47lt9h.public.blob.vercel-storage.com/przechowywanie-kwasow-i-zasad-2026-10-15-reagents.csv

**About the data: Acids and bases from the chemical resistance table: CLP classification and shared storage**

- Sample: 17
- Collected: 15 October 2026
- Version: 2026-10-15
- Licence: No licence, source terms
- Data creator: Durcon Company of Poland Sp. z o.o.

This dataset is a closed list of the acids and bases in the countertop chemical resistance table: 17 reagents, including 13 acids and 4 bases, with the name and concentration carried over unchanged from the public export of the base dataset chemical-resistance, version 2026-09-24. The dataset has version 2026-10-15. The list of reagents is in the file reagents.csv. The file clp\_entries.csv holds the Annex VI entries of the CLP Regulation that PubChem attaches to a compound, read on 15 October 2026, and the file chem\_candidates.csv holds the candidate rows with flags for cases to be resolved.

Method: an acid is a reagent with the word “acid” in its identifier or English name, a base is a reagent with the word “hydroxide” or “ammonia” in its identifier. The entry for a reagent is chosen by an explicit rule: for a solution, entries for the gas and the anhydrous form are dropped, the strength condition in the entry name must be met, and where there are several entries, the only entry for a solution wins. Hazard groups follow the pictogram of the entry. The numbers are counts of the list, without shares.

Origin of the list: the source table of Durcon Company of Poland Sp. z o.o., “Wynik 16-godzinnego testu odporności chemicznej” (in English, the result of the chemical resistance test), published in 2009 at the latest. Test date unknown; the party that performed the test is unknown. This dataset does not contain countertop resistance ratings; from the table it takes only names and concentrations. Renggli is the editor of the dataset.

In the base dataset the polypropylene column is withheld entirely, because the source of its ratings is unknown and one of the older versions of the table labelled it as glass. The row of the reagent 2-Butanone is also withheld. The ratings of the quartz-granite composite board, the material of one of the table's columns, are not confirmed by independent laboratory tables. This list does not use ratings, so the withholdings do not change it.

Verification status: closed list of acids and bases from the public export of the chemical-resistance dataset 2026-09-24; the threshold limits (SCL) of the entries are not in the data.

Limitations: a hazard group describes the Annex VI entry of the substance, not the solution at the concentration from the table. For ammonia and phosphoric acid, the missing entry is a gap in name matching: PubChem attaches such an entry, but the selection rule did not recognise it. The entries come from PubChem, not from the consolidated text of the regulation. Mixtures have no classification in the dataset. The rules for storing substances together come from the 2013 CIOP-PIB booklet on chemical warehouses, not from this dataset.

Sources and licences: names and concentrations have no open licence and are used on the terms of the source table; Annex VI is an EU legal act, and PubChem (NCBI) is cited by name. CSV files: reagents.csv (list of reagents), clp\_entries.csv (Annex VI entries) and chem\_candidates.csv (candidate rows).

Suggested citation: Renggli, dataset przechowywanie-kwasow-i-zasad, version 2026-10-15, list of reagents from the chemical-resistance dataset 2026-09-24, classification from Annex VI CLP read through PubChem.

The text was prepared by the Renggli editorial team; every number comes from this dataset or from the source cited in the sentence.

Sources:

- [https://mom5efytyj47lt9h.public.blob.vercel-storage.com/tabela-odpornosci-chemicznej-blatow-pl.pdf](https://mom5efytyj47lt9h.public.blob.vercel-storage.com/tabela-odpornosci-chemicznej-blatow-pl.pdf)
- [https://mom5efytyj47lt9h.public.blob.vercel-storage.com/tabela-odpornosci-chemicznej-blatow-en.pdf](https://mom5efytyj47lt9h.public.blob.vercel-storage.com/tabela-odpornosci-chemicznej-blatow-en.pdf)
- [https://mom5efytyj47lt9h.public.blob.vercel-storage.com/tabela-odpornosci-chemicznej-blatow-de.pdf](https://mom5efytyj47lt9h.public.blob.vercel-storage.com/tabela-odpornosci-chemicznej-blatow-de.pdf)
- [https://mom5efytyj47lt9h.public.blob.vercel-storage.com/tabela-odpornosci-chemicznej-blatow-uk.pdf](https://mom5efytyj47lt9h.public.blob.vercel-storage.com/tabela-odpornosci-chemicznej-blatow-uk.pdf)
- [https://mom5efytyj47lt9h.public.blob.vercel-storage.com/tabela-odpornosci-chemicznej-blatow-lt.pdf](https://mom5efytyj47lt9h.public.blob.vercel-storage.com/tabela-odpornosci-chemicznej-blatow-lt.pdf)
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Files:

- [przechowywanie-kwasow-i-zasad-2026-10-15-reagents.csv](https://mom5efytyj47lt9h.public.blob.vercel-storage.com/przechowywanie-kwasow-i-zasad-2026-10-15-reagents.csv) (17 rows · 1 kB)
- [przechowywanie-kwasow-i-zasad-2026-10-15-clp\_entries.csv](https://mom5efytyj47lt9h.public.blob.vercel-storage.com/przechowywanie-kwasow-i-zasad-2026-10-15-clp_entries.csv) (8 rows · 2 kB)
- [przechowywanie-kwasow-i-zasad-2026-10-15-chem\_candidates.csv](https://mom5efytyj47lt9h.public.blob.vercel-storage.com/przechowywanie-kwasow-i-zasad-2026-10-15-chem_candidates.csv) (10 rows · 6 kB)
- [przechowywanie-kwasow-i-zasad-2026-10-15-summary.json](https://mom5efytyj47lt9h.public.blob.vercel-storage.com/przechowywanie-kwasow-i-zasad-2026-10-15-summary.json) (20 kB)
- [przechowywanie-kwasow-i-zasad-2026-10-15-feasibility.json](https://mom5efytyj47lt9h.public.blob.vercel-storage.com/przechowywanie-kwasow-i-zasad-2026-10-15-feasibility.json) (2 kB)
- [przechowywanie-kwasow-i-zasad-2026-10-15-datapackage.json](https://mom5efytyj47lt9h.public.blob.vercel-storage.com/przechowywanie-kwasow-i-zasad-2026-10-15-datapackage.json) (31 kB)

## Frequently asked questions {#frequently-asked-questions}

**Can acids and bases be kept in one cabinet?**

The CIOP-PIB booklet recommends separating chemicals that may react with each other, and an acid reacts with a base. That is why they stand at least on separate shelves or in separate spill trays, and the details are given in the safety data sheet of each solution.

**Can nitric acid be stored together with other acids?**

Concentrated nitric acid cannot. In its table of storage prohibitions, the CIOP-PIB booklet lists for concentrated nitric acid, among others, concentrated sulfuric acid and organic compounds, which include acetic, citric and oleic acid.

**How should glacial acetic acid be stored?**

Acetic acid is a case for the safety data sheet. Its Annex VI entry has the corrosive pictogram and the flame pictogram. The safety data sheet of the solution says whether the bottle belongs in a flammable liquids cabinet, and concentrated nitric acid does not stand next to a bottle of acetic acid.

**Can toxic and corrosive reagents stand together?**

On this list, 3 reagents have the skull pictogram in their entry, and each of them also has the corrosive pictogram. Packages with the same pictograms may stand together, but a bottle with the additional skull pictogram needs to be checked in the safety data sheet.

**Enquiry about a cabinet for acids and bases** A list of the workstation's acids and bases with their safety data sheets can be attached to the enquiry. [Send an enquiry](https://www.renggli.pl/en/contact)

## Sources

- [W. Domański, J. Kurpiewska, Podstawowe zasady bezpiecznej pracy w magazynach chemikaliów, CIOP-PIB, Warszawa 2013](https://m.ciop.pl/CIOPPortalWAR/file/94632/Podstawowe_zasady_bezpiecznej_pracy_w_magazynach_chemikaliow-Domanski_2013.pdf), Centralny Instytut Ochrony Pracy, Państwowy Instytut Badawczy
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