0.9% Benzyl Alcohol in Bacteriostatic Water: What Does It Mean?
On a bacteriostatic water label, 0.9% benzyl alcohol identifies the stated concentration of the added preservative. It is a formulation detail, separate from the vial’s volume or expiry date. UKB’s own-brand listings state this concentration, but other manufacturer products may differ. Check the exact label and documentation when selecting water for laboratory or analytical research.
Updated 5 October 2026 · Laboratory and analytical research information only.
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Why is benzyl alcohol listed on BAC water?
Benzyl alcohol is identified as the bacteriostatic preservative in many labelled bacteriostatic-water products. Its presence distinguishes that formulation from a preservative-free water preparation. A preservative statement is one part of the specification; the full product identity, container presentation and manufacturer instructions still matter.
What does the 0.9% statement tell a buyer?
It describes concentration, rather than the total container volume. A 3 mL vial and a 30 mL vial can carry the same concentration statement while containing different supplied volumes. It is not a measure of product purity, an expiry period or an instruction about how much to use.
Where the percentage basis is unclear, use the manufacturer’s documentation instead of making assumptions from a retailer’s shortened description.
Does every manufacturer use the same formulation?
No. Pfizer’s product description, for example, includes both 0.9% and 1.1% benzyl alcohol formulations. This is why the specific label matters more than the general product name.
Formulation reference: Pfizer’s product description. This describes its own labelled products; it does not certify UKB products or determine their intended use.
A matching preservative concentration alone does not establish that two products have identical grades, packaging or suitability for a particular analytical method.
Is 0.9% benzyl alcohol the same as 0.9% saline?
No. Benzyl alcohol and sodium chloride are different substances. Similar percentage wording does not make the products equivalent. Read the full ingredient name and product specification, and do not use a shortened search phrase as the basis for a laboratory purchase.
See the sterile-water comparison for another common naming distinction.
Which UKB listings state 0.9% benzyl alcohol?
The own-brand pages for UKB3ML · 3 mL, UKB10 · 10 mL and UKB30 · 30 mL state 0.9% benzyl alcohol and identify the volume and glass-vial presentation. Check the supplied label alongside the listing when receiving stock; contact UKB if the information differs or is incomplete.
The size guide compares packaging choices. For the wider range, open the UK buying guide.
Does the preservative determine storage or expiry?
Do not use the concentration statement to infer a storage temperature or a universal period after opening. Those are separate product-specific instructions. The labelled expiry also should not be treated as a guarantee for an opened container.
Read how to check bacteriostatic water storage information and the BAC water basics.
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