Bac water · SKU LD-MW10

Bacteriostatic Water 10ml (Bac Water, 0.9% Benzyl Alcohol)

Name: Labdrop Bacteriostatic Water 10ml (Bac Water, 0.9% Benzyl Alcohol)
Brand: Labdrop
Price: 5.95 GBP
Availability: InStock

Sterile0.9% benzyl alcohol in purified water10 ml borosilicate vial

£5.95

Pack size: 1 vial

1 vial£5.95£5.95 per vial 10 vials£54.00£5.40 per vialSave 9% 50 vials£247.50£4.95 per vialSave 16%

Number of packs

Order by 3pm, Monday to Friday, for same-day dispatch

Royal Mail Tracked 24 £4.95 · Special Delivery by 1pm £8.95 · No dispatch at weekends or on bank holidays

Held in UK stock, tracked delivery on every order
Card or Pay by Bank at checkout
No account needed

Labdrop bacteriostatic water, often shortened to bac water, is sterile purified water with 0.9% w/v benzyl alcohol added as a preservative. It comes in a 10 ml Type I borosilicate vial, sealed with a butyl stopper and a blue aluminium flip-off cap.

What the benzyl alcohol does

Sterile water has no preservative, so once a vial is opened it is meant for one use. The 0.9% benzyl alcohol in bac water stops bacteria growing in the vial, so it can be used for multiple withdrawals for 28 days after the stopper is first pierced. That is why it is the usual diluent for reconstituting lyophilised laboratory reagents.

Storage and shelf life

Keep vials sealed, between 2 and 25 °C and away from light. A fridge is fine but not needed. Unopened, a vial lasts 24 months from its fill date. The lot number and expiry are printed on every label, and the QR code links back to this page. Discard a vial 28 days after first opening.

Packs and bulk

Buy a single vial, or packs of 10 and 50 to bring the price per vial down. Labs that apply their own labels can buy the same water unlabelled in packs of 50, 100 and 200.

Everything is held in UK stock. Orders placed before 3pm Monday to Friday are dispatched the same working day by Royal Mail Tracked 24. Answers to the most common questions are in our bac water FAQ.

For laboratory use only. Not for human or veterinary use.

Specification

Composition: Purified water, benzyl alcohol 0.9% w/v
Volume: 10 ml
Container: Type I borosilicate glass, butyl stopper, aluminium flip-off cap
Sterility: Sterile filtered, sealed
Storage, sealed: 2–25 °C, away from light
After opening: Discard after 28 days
Shelf life: 24 months from fill date, printed as EXP on the label

Safety Data Sheet Coming soon

Common questions

What is bac water?

Bac water is short for bacteriostatic water: sterile purified water with 0.9% benzyl alcohol added as a preservative. It is also sold as mixing water.

What is the difference between bac water and sterile water?

Sterile water has no preservative, so a vial is meant for a single use. Bac water contains 0.9% benzyl alcohol, which keeps it usable for multiple withdrawals for 28 days after the stopper is first pierced.

How long does bac water last?

Sealed, it lasts until the expiry date printed on the label, which is 24 months from the fill date. Once the stopper has been pierced, discard it after 28 days.

Does bac water need to be refrigerated?

No. Store it between 2 and 25 °C, away from light, before and after opening. A fridge falls within that range, so keeping it in the fridge is fine, but it is not required.

How should bac water be stored?

Keep it sealed, between 2 and 25 °C and away from light.

Can I buy bac water in bulk?

Yes. This 10 ml vial comes in packs of 1, 10 and 50, and we also sell unlabelled bac water in bulk packs of 50, 100 and 200 vials.

Where can I buy bac water in the UK?

Labdrop holds bac water in UK stock. Orders placed before 3pm Monday to Friday are dispatched the same working day by Royal Mail Tracked 24. Pharmacies do not generally stock it.