Acidity Standards in Industrial Vinegar Production: BRC vs FDA

Acidity is the first number a professional buyer looks at on a vinegar specification, and often the only one that reaches the purchase order. It is also the number most often misunderstood, because two different frameworks govern it and they do not govern the same thing.

What "6% acidity" actually means

Acidity in vinegar is expressed as grams of acetic acid per 100 millilitres of product. A vinegar declared at 6% carries six grams of acetic acid in every 100 ml. It is a concentration, not a pH. Two vinegars can share a pH and differ in acidity, because pH measures free hydrogen ions while total acidity measures everything the fermentation produced.

The distinction has consequences in production. Acidity drives preservation: it is what makes a pickling brine shelf-stable. pH drives taste perception and enzyme activity. A buyer who specifies only a pH has not specified the product.

What the FDA requires

For the United States market the reference is the Food and Drug Administration's long-standing position that a product sold as vinegar should contain at least 4 grams of acetic acid per 100 millilitres. It is a floor on identity: below it, the product may not carry the name. The FDA sets no ceiling and prescribes no value for a particular style. Wine vinegar, cider vinegar and spirit vinegar are all measured against the same minimum.

The European Union has no equivalent single standard of identity for vinegar. National rules, the Codex regional standard and, in practice most decisively, the buyer's own written specification govern what a given lot must deliver. This is why an exporter serving both markets works to declared specifications rather than to one regulatory number.

What BRCGS requires

This is where the comparison in this article's title breaks down, and the break is worth stating plainly: BRCGS sets no acidity value at all. It is a food safety and quality management standard. It asks how you control the number you have declared.

An audit looks for a documented specification per product, a validated analytical method, calibrated equipment with traceable records, a defined tolerance, and a corrective action procedure for a lot that falls outside it. A fully certified supplier may produce a 4% vinegar or a 10% one. Certification tells a buyer that the declared figure is measured, recorded and defensible. It does not tell them what the figure is.

So the two frameworks are not alternatives to choose between. The FDA governs what you may call the product in one market. BRCGS governs whether the supplier can prove the number, in every market. Our certifications page lists the schemes we hold.

How acidity is verified in practice

The reference method is titration. A measured volume of vinegar is neutralised with a sodium hydroxide solution of known concentration, and the volume consumed gives the acetic acid content directly. In a laboratory running many lots a day this is automated by potentiometric titration, which takes the operator's reading of a colour change out of the result.

Two controls sit around it. The titrant is standardised on a schedule, because a drifting sodium hydroxide concentration shifts every result in the same direction and is invisible in the numbers alone. And a retained sample from each lot allows a disputed result to be re-tested against the original material rather than against a fresh production run. Both are part of our quality control plan.

The acidity of our range

Most of our vinegars are produced at 6% acidity: white alcohol vinegar, red wine vinegar, white wine vinegar, and the flavoured and coloured lines.

Our apple cider vinegar sits at 5%, in both the filtered and the unfiltered version. The lower figure is deliberate: cider vinegar is bought for the character of the fruit, and pushing the acetic acid higher flattens it.

Our condiments carry lower figures, because there acidity is one ingredient among several rather than the product itself: 4% in the brine of our lemon pickled gherkins, 3% in our hot sauce and in our caper paste, 2.5% in our hot pepper paste. The full range is on the products page.

Acidity can be adjusted to a customer's specification on production runs. Every lot is checked before release and the figures are recorded against the lot number.

Four questions to ask a supplier

Four questions separate a specification from a claim. What is the declared acidity, and what is the tolerance around it? What method measures it, and is the equipment calibrated against a traceable standard? Will a certificate of analysis accompany each lot? Is a sample retained, and for how long?

A supplier who answers all four in writing is a supplier whose number you can build a recipe around. Send us your specification and we will answer it against ours.