Acetic acid
64-19-7 · Acetasol · Acetic acid-2-13C,d4 · Acetic acid · Acetic acid (aqueous) · Acetic acid (natural) · Acetic acid 0.25% in plastic container · Acetic acid glacial · Acetic acid, diluted · acetic acid- · Acetic-13C2 acid (8CI,9CI) · Aceticum acidum · Acetopyrine · Aci-jel · Acide acetique · Acido acetico · Acidum aceticum · Acidum aceticum glaciale · AcOH · Acopyrine · Azetat · Azijnzuur · BRN 0506007 · Caswell No. 003 · CH3-COO(-) · CH3-COOH · CH3COOH · DYSPEPSIA FATIGUE · E 260 · Earcalm · EPA Pesticide Chemical Code 044001 · Essigsaeure · Ethanoat · ethanoate · ethanoic acid · Ethanoic acid monomer · ethoic acid · ethylic acid · FEMA No. 2006 · FUNGAL NAIL REPAIR · Glacial acetic acid · Glacial acetic acid (pure compound) · HOAc · hydron;acetate · INS NO.260 · INS-260 · Kyselina octova · MeCO2 anion · MeCOOH · methane carboxylic acid · Methanecarboxylic acid · New CleanFlex · Octowy kwas · Orlex · Orthoacetic acid · Otic Domeboro · Otic Tridesilon · Shotgun · vinegar · Vinegar acid · E260 · 260 · Acetic acid · Acetic acid · Acetic acid · Acid acetic · Acide acétique · Acto rūgštis · Azijnzuur · Aċidu aċetiku · Ecetsav · Eddikesyre · Essigsäure · Etikkahappo · Etiķskābe · Kwas octowy · Kyselina octová · ocetna kislina · Octena kiselina · Ácido acético · Ättiksyra · Äädikhape · Οξικό οξύ · Оцетна киселинаE number E260INS 260CAS 64-19-7
Listed as a preservative and an acidity regulator by Canada, Codex and the US.
Listed as preservatives (CA, US, Codex) · acidity regulators (CA, US, Codex) · flavour enhancers (US) · curing and pickling agents (US) · flavouring agents and adjuvants (US) · solvents and vehicles (US)
- Canada: Preservative — Health Canada, List of Permitted Preservatives (List 11)
- United States: Antimicrobial agent — FDA, Substances Added to Food: ACETIC ACID
- Codex Alimentarius: Preservative — CXS 192-1995 Table One, INS 260
- Canada: Acidity regulator — Health Canada, List of Permitted Acidity Regulators and Acid-Reacting Materials (List 10)
- United States: pH control agent — FDA, Substances Added to Food: ACETIC ACID
- United States: pH control agents — 21 CFR 184.1005, citing 21 CFR 170.3(o)(23)
- Codex Alimentarius: Acidity regulator — CXS 192-1995 Table One, INS 260
- United States: Flavor enhancer — FDA, Substances Added to Food: ACETIC ACID
- United States: Flavor enhancers — 21 CFR 184.1005, citing 21 CFR 170.3(o)(11)
- United States: Curing and pickling agents — 21 CFR 184.1005, citing 21 CFR 170.3(o)(5)
- United States: Flavoring agent or adjuvant — FDA, Substances Added to Food: ACETIC ACID
- United States: Flavoring agents and adjuvants — 21 CFR 184.1005, citing 21 CFR 170.3(o)(12)
- United States: Solvents and vehicles — 21 CFR 184.1005, citing 21 CFR 170.3(o)(27)

Acetic acid is the acid of vinegar, used as an acidity regulator and preservative in pickles, sauces, dressings and bread. Glacial acetic acid is the concentrated form handled by manufacturers rather than sold as vinegar.
Where it is and isn’t permitted
| Jurisdiction | Status | Scope and limits | Citation |
|---|---|---|---|
| Australia and New Zealand | Permitted, with conditions | 56 food categories highest permitted level 5,000 mg/kg Show every food category
| Food Standards Code, Schedule 15, S15—5and 55 further provisionsretrieved 2026-10-17 |
| Canada | Permitted, with conditions | no numerical limit (good manufacturing practice) 7 permitted uses Show every permitted use
| Health Canadaand 6 further provisionsretrieved 2026-10-17 |
| European Union | Permitted, with conditions | 75 food categories Show every food category
| Regulation (EC) No 1333/2008, Annex IIand 74 further provisionsretrieved 2026-10-18 |
| Great Britain | Permitted, with conditions | 73 food categories Show every food category
| Assimilated Regulation (EC) No 1333/2008and 72 further provisionsretrieved 2026-10-18 |
| Japan | Permitted, with conditions | Designated additive: Appended Table 1, item 334, 氷酢酸 (“Glacial Acetic Acid” in the unofficial English translation). …Designated additive: Appended Table 1, item 334, 氷酢酸 (“Glacial Acetic Acid” in the unofficial English translation). Standards for use — Specifications and Standards for Foods, Food Additives, etc. (MHW Notification No. 370 of 1959), Part II (Food Additives), F (Standards for use): The Notification sets no standard for use (使用基準) for this additive, so it is not restricted there to particular foods or amounts. Compositional specifications for this additive, in the same Notification, are not imported and are not shown here; nor are the general rules in F 添加物一般, which apply to every additive. | Regulations for Enforcement of the Food Sanitation Act (MHW Ordinance No. 23 of 1948), Appended Table 1retrieved 2026-10-18 |
| South Korea | Permitted, with conditions | Designated food additive: Standards and Specifications for Food Additives, Part III, 1. …Designated food additive: Standards and Specifications for Food Additives, Part III, 1. 일반식품첨가물 (general food additives), 빙초산 (“Glacial Acetic Acid”, the English the Code prints beside it); 1. 일반식품첨가물 (general food additives), 초산 (“Acetic Acid”, the English the Code prints beside it). Main use (주용도) of 빙초산: 산도조절제, 보존료, 향료. Standard for use (사용기준) of 빙초산: (1) [to be used under the general standard for use in II. 2. 1), the minimum amount that achieves the technical effect, with no limit set for this additive in particular] “II. 2. 1)의 규정에 따라 사용하여야 한다.” Main use (주용도) of 초산: 산도조절제, 향료. Standard for use (사용기준) of 초산: (1) [to be used under the general standard for use in II. 2. 1), the minimum amount that achieves the technical effect, with no limit set for this additive in particular] “II. 2. 1)의 규정에 따라 사용하여야 한다.” The Korean is the standard as published. There is no official English translation of the current Code (the English version on MFDS’s website is the 2020 edition and has no legal effect); the English in square brackets is this site’s description of what each sentence does, not a translation of the foods or the levels. Compositional specifications (Part IV) are not imported, nor are the general standards in Part II, which apply to every additive. | Standards and Specifications for Food Additives (식품첨가물의 기준 및 규격), MFDS Notification, Part III (Standards for use, by item)retrieved 2026-10-18 |
| United States | Permitted | 21 CFR 184.1005retrieved 2026-10-17 | |
| Codex Alimentarius | Permitted, with conditions | 13 food categories highest permitted level 5,000 mg/kg Show every food category and its notes
| CXS 192-1995 Table Three, INS 260and 13 further provisionsretrieved 2026-09-07 |
How much is permitted
A listing usually limits the quantity as well as the food. Only one of the forms that takes is a figure: quantum satis and good manufacturing practice permit the amount the technological effect requires and no more, which is a limit rather than the absence of one. Figures below are the range across every food category this page is listed in, and categories differ between regulators — see how much is permitted.
| Australia and New Zealand | 5,000 mg/kg | 1 numeric limit, 55 GMP |
|---|---|---|
| Canada | — | 7 GMP |
| European Union | — | 46 several limits, 7 quantum satis, 22 no quantity stated |
| Great Britain | — | 73 quantum satis |
| Japan | — | 1 no quantity stated |
| South Korea | — | 1 no quantity stated |
| United States | — | 1 no quantity stated |
| Codex Alimentarius | 5,000 mg/kg | 1 numeric limit, 13 GMP |
What it is made from
Produced industrially by carbonylating methanol, and by fermentation where vinegar is wanted rather than the pure acid. The synthetic and fermented routes give the same molecule but are labelled differently, and only the fermented route may be called vinegar.
- Vegan
- Vegetarian
Compare other additives on the dietary indexes.
- CAS registry number
- 64-19-7
- InChIKey
- QTBSBXVTEAMEQO-UHFFFAOYSA-N
- PubChem
- CID 176
The two specifications, compared
The European Union sets identity and purity by regulation; JECFA publishes its own through FAO, advisory until a country adopts it. Both documents are below in full. These are the parameters each puts a number on.
| Parameter | European Union | JECFA |
|---|---|---|
| Assay | no less than 99.8 % | no less than 99.5 % |
| Lead | no more than 0.5 mg/kg | no more than 2 mg/kg |
| Arsenic | no more than 1 mg/kg | — |
| Mercury | no more than 1 mg/kg | — |
2 parameters differ between the two documents. A difference is not a disagreement about safety: the two are revised on their own cycles, and an assay or a drying loss can be measured against a different preparation of the substance, which is why only the contaminant ceilings are marked. Within the EU the EU's figure is the one that binds.
How the EU defines it
The legal specification an additive must meet to be sold as this E number in the EU — what it is, how it may be made, and the purity it must reach. From Commission Regulation (EU) No 231/2012.
E 260 Acetic acid
Assay, identification and purity criteria
Description and assay
- Einecs
- 200-580-7
- Chemical name
- Acetic acid; Ethanoic acid
- Chemical formula
- C₂H₄O₂
- Molecular weight
- 60,05
- Assay
- Content not less than 99,8 %
- Description
- Clear, colourless liquid having a pungent, characteristic odour
Identification
- Boiling point
- 118 °C at 760 mm pressure (of mercury)
- Specific gravity
- About 1,049
- Test for acetate
- A one in three solution gives positive tests for acetate
- Solidification point
- Not lower than 14,5 °C
Purity criteria
- Non-volatile residue
- Not more than 100 mg/kg
- Formic acid, formates and other oxidisable substances
- Not more than 1 000 mg/kg expressed as formic acid
- Readily oxidisable substances
- Dilute 2 ml of the sample in a glass-stoppered container with 10 ml of water and add 0,1 ml of 0,1 N potassium permanganate. The pink colour does not change to brown within 30 minutes
- Arsenic
- Not more than 1 mg/kg
- Lead
- Not more than 0,5 mg/kg
- Mercury
- Not more than 1 mg/kg
How JECFA defines it
The international specification for identity and purity, prepared by the Joint FAO/WHO Expert Committee on Food Additives and published by FAO. It is a different document from any above, written by a different body and revised on its own cycle; it is advisory, and a country adopts it or does not.
INS 260 Acetic Acid, Glacial
Acetic acid is manufactured by aerial oxidation of C5-C6 fractions of aliphatic hydrocarbons, and separation of the various acids by distillation. Also by oxidation of acetaldehyde, methanol and of butane or as the reaction product of methanol and carbon dioxide.
Synonyms: INS No. 260 Ethanoic acid
Assay, identification and purity criteria
Description and assay
- Specification history
- Prepared at 63 rd JECFA (2004) and published in FNP 52 ADD 12 (2004) superseding specifications prepared at the 19 th JECFA (1975), and published in FNP 52 (1992). Metal contaminants specifications amended at the 59th JECFA (2002). A group ADI ‘not limited’ for acetic acid and its potassium and sodium salts was established at the 17th JECFA (1973) and maintained at the 49 th JECFA (1997).
- Chemical name
- Acetic acid, ethanoic acid
- C.A.S. number
- 64-19-7
- Chemical formula
- C 2 H 4 O 2
- Formula weight
- 60.05
- Assay
- Not less than 99.5%
- DESCRIPTION
- Colourless liquid, having a pungent characteristic odour
- FUNCTIONAL USES
- Acid, flavouring agent (see Flavouring agent specification, JECFA No. 81)
Identification
- Solubility (Vol. 4)
- Miscible with water, ethanol, glycerol and diethyl ether
- Test for acid
- 1 in 3 aqueous solution is acidic
- Test for acetate (Vol. 4)
- Apply to a 1 in 3 solution of the sample Passes test
Purity criteria
- Solidification point (Vol. 4)
- Not lower than 15.6º
- Non-volatile residue (Vol. 4)
- Not more than 0.01% after evaporation of 20 g of the sample and holding at 100° for 2 h.
- Readily oxidizable substances
- Dilute 2 ml of the sample in a glass-stoppered container with 10 ml of water and add 0.1 ml of 0.1 N potassium permanganate. The pink colour does not change to brown within 30 min.
- METHOD OF Measure about 2 ml of the sample into a tared, glass-stoppered flask, ASSAY and weigh accurately. Add 40 ml of water, then add phenolphthalein TS and titrate with 1 N sodium hydroxide. Each ml of 1 N sodium hydroxide is equivalent to 60.05 mg of C
- 2 H 4 O 2 .
INS 262(ii) Sodium Diacetate
A molecular compound of sodium acetate and acetic acid
Synonyms: INS No. 262(ii)
Assay, identification and purity criteria
Description and assay
- Specification history
- Prepared at the 17th JECFA (1973), published in FNP 4 (1978) and in FNP 52 (1992). Metals and arsenic specifications revised at the 63rd JECFA (2004). An ADI of 0-15 mg/kg bw was established at the 17th JECFA (1973)
- Chemical names
- Sodium hydrogen diacetate
- C.A.S. number
- Sodium acetate: 127-09-3 Acetic acid: 64-19-7
- Chemical formula
- C 4 H 7 NaO 4 · xH 2 O
- Formula weight
- 142.09 (anhydrous)
- Assay
- 39-41% of free acetic acid; 58-60% of sodium acetate
- DESCRIPTION
- White, hygroscopic crystalline solid with an acetic odour
- FUNCTIONAL USES
- Antimould and antirope agent, sequestrant
- METHOD OF ASSAY
- Sodium acetate Weigh 0.5 g of the sample to the nearest mg and dissolve in 50 ml of glacial acetic acid. Dry the exterior of a glass-calomel electrode assembly of a pH meter and place the electrodes in the solution. Set the pH meter on the + mV circuit, and add 0.1 N perchloric acid in large increments until the mV-changes with each addition shows that the titration is nearing the end-point (the deflection of the needle becomes noticeable). Then reduce the added fractions to 0.1 ml until there is a further decrease in the mV-changes after each addition. Plot the curve obtained by the milliliters added against the mV- readings and determine the quantity of the titrant corresponding to half-way up the steepest gradient. where V = ml of the perchloric acid N = exact normality of the perchloric acid w = weight (in grams) of the sample Free acetic acid Weigh 4 g of the sample to the nearest mg and dissolve in 50 ml of distilled water. Titrate the solution with N sodium hydroxide using phenolphthalein TS as indicator. where V = ml of the sodium hydroxide N = exact normality of the sodium hydroxide W = weight (in grams) of the sample
Identification
- Solubility (Vol. 4)
- Freely soluble in water
- Ignition test
- Ignite the sample. An alkaline residue is formed which effervesces on acidification.
- Test for acetate (Vol. 4)
- Passes test
- Test for sodium (Vol. 4)
- Passes test
Purity criteria
- Water (Vol. 4)
- Not more than 2% (Karl Fischer Method)
- pH (Vol. 4)
- 4.5 - 5.0 (1 in 10 soln)
- Formic acid and oxidizable impurities
- Not more than traces Dissolve 2.5 g of the sample in 5 ml of water. Add 2.5 ml of 0.1 N potassium dichromate and 6 ml of sulfuric acid, and allow to stand for 1 min. Add 20 ml of water, cool to 15 o and add 1 ml of potassium iodide TS. A faint yellow or brown colour should be produced immediately.
- Aldehydes
- Not more than 0.2% (as propanal) Dissolve 5 g of the sample in 10 ml of water and distil. To the first 5 ml of the distillate, add 10 ml of mercuric chloride TS and make alkaline with N sodium hydroxide. Allow to stand for 5 min, and acidify with dilute sulfuric acid TS. The solution should show no more than a faint turbidity.
- Lead (Vol. 4)
- Not more than 2 mg/kg Determine using an atomic absorption technique appropriate to the specified level. The selection of sample size and method of sample preparation may be based on the principles of the method described in Volume 4, “Instrumental Methods.”
Authorised in other additives, enzymes, flavourings and nutrients
These authorisations are not for use in food. They let this substance be used inside another additive, a food enzyme, a flavouring or a nutrient preparation — often as a carrier — and it reaches food only as part of that product. Annex III to Regulation (EC) No 1333/2008.
| Part | May be used in | Maximum level | Citation |
|---|---|---|---|
| Annex III, Part 2: Food additives other than carriers in food additives | All food additive preparationsAuthorised as a member of Table 1 of Part 6, listed as "Table 1" Note (1): Except enzymes authorised as food additives. | quantum satis | Regulation (EC) No 1333/2008, Annex III, Part 2, via Table 1 of Part 6 |
| Annex III, Part 3: Food additives including carriers in food enzymes | Food enzymesCan be used as a carrier: Yes Note (1): Including enzymes authorised as food additives. | In enzyme preparation: quantum satis In final food except beverages: quantum satis In beverages: quantum satis | Regulation (EC) No 1333/2008, Annex III, Part 3 |
| Annex III, Part 4: Food additives including carriers in food flavourings | All flavouringsAuthorised as a member of Table 1 of Part 6, listed as "Table 1" | quantum satis | Regulation (EC) No 1333/2008, Annex III, Part 4, via Table 1 of Part 6 |
| Annex III, Part 5, Section A: Food additives added in nutrients except in nutrients intended to be used in foodstuffs listed in Part E, point 01.10, of Annex II and foodstuffs for infants and young children listed in Part E, point 13.1, of Annex II | All nutrients | quantum satis | Regulation (EC) No 1333/2008, Annex III, Part 5, Section A |
Every name it appears under
84 recorded names. A label may use any of them.
E number
- E260
INS number
- 260
CAS registry number
- 64-19-7
As it appears in regulation
- Acetic acid
Other names
- Acetasol
- Acetic acid-2-13C,d4
- Acetic acid
- Acetic acid (aqueous)
- Acetic acid (natural)
- Acetic acid 0.25% in plastic container
- Acetic acid glacial
- Acetic acid, diluted
- acetic acid-
- Acetic-13C2 acid (8CI,9CI)
- Aceticum acidum
- Acetopyrine
- Aci-jel
- Acide acetique
- Acido acetico
- Acidum aceticum
- Acidum aceticum glaciale
- AcOH
- Acopyrine
- Azetat
- Azijnzuur
- BRN 0506007
- Caswell No. 003
- CH3-COO(-)
- CH3-COOH
- CH3COOH
- DYSPEPSIA FATIGUE
- E 260
- Earcalm
- EPA Pesticide Chemical Code 044001
- Essigsaeure
- Ethanoat
- ethanoate
- ethanoic acid
- Ethanoic acid monomer
- ethoic acid
- ethylic acid
- FEMA No. 2006
- FUNGAL NAIL REPAIR
- Glacial acetic acid
- Glacial acetic acid (pure compound)
- HOAc
- hydron;acetate
- INS NO.260
- INS-260
- Kyselina octova
- MeCO2 anion
- MeCOOH
- methane carboxylic acid
- Methanecarboxylic acid
- New CleanFlex
- Octowy kwas
- Orlex
- Orthoacetic acid
- Otic Domeboro
- Otic Tridesilon
- Shotgun
- vinegar
- Vinegar acid
Systematic names
- Acetic acid
Hazard reference values
No reference value for this substance in the sources we hold.
Evidence and how bodies read it
Studies, and the differing conclusions regulators drew from them, are curated rather than machine-read, and none has been written for this substance yet.
Common questions
Assembled from what is above, in the words the questions are usually asked in. Each answer is the same statement the relevant section makes, with the same citations behind it.
- What is E 260?
- E 260 is Acetic acid. Acetic acid is the acid of vinegar, used as an acidity regulator and preservative in pickles, sauces, dressings and bread. Glacial acetic acid is the concentrated form handled by manufacturers rather than sold as vinegar.
- What is Acetic acid used for in food?
- It is listed as a preservative and an acidity regulator — the role Canada, Codex and the US assign it. This page shows every function each regulator records, with the citation for each.
- Where is Acetic acid permitted?
- Of the seven regulators this site reads, Australia and New Zealand, Canada, the EU, Great Britain, Japan, South Korea, the US and the Codex standard permit it. Each permission is for named foods at named levels, not a blanket one; the table on this page gives them with citations.
- Is Acetic acid vegan?
- Yes. Acetic acid is not derived from animals, and is suitable for vegetarians. This page says what it is made from and how.
Sources for this page
- anz retrieved 2026-10-17
- ca retrieved 2026-10-17
- eu retrieved 2026-10-18
- gb retrieved 2026-10-18
- jp retrieved 2026-10-18
- kr retrieved 2026-10-18
- ecfr retrieved 2026-10-17
- gsfa retrieved 2026-09-07
- euspecs retrieved 2026-10-18
- jecfaspecs retrieved 2026-09-23
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