FAQ
Frequently Asked Questions
What is Bacteriostatic (BAC) Water and how does it work?
Bacteriostatic Water is sterile USP-grade water containing 0.9% benzyl alcohol as a bacteriostatic preservative. It is commonly used in laboratory settings to dissolve or dilute powdered research compounds so they can be sampled multiple times from the same vial. The preservative helps inhibit bacterial growth after the vial has been opened, making it suitable for repeated laboratory use when handled according to established research protocols.
What ingredients are inside BAC water? (0.9% Benzyl Alcohol)
Just two components: a Water base and 0.9% benzyl alcohol acting as the bacteriostatic preservative. No salts, buffers, or other additives.
Is BAC water the same as sterile water or saline?
No. Sterile water has no preservative and is single-use once opened. Saline contains sodium chloride. BAC water contains 0.9% benzyl alcohol, making it safe for multi-sampling use.
How should unopened and opened BAC water be stored?
Store at controlled room temperature, 20–25°C (68–77°F), away from direct light. Unopened shelf life is up to 24 months; after first puncture, use within 28 days.
Can BAC water expire or become contaminated?
Yes. Discard after the printed expiry, after 28 days from first puncture, or immediately if the solution is cloudy, discolored, or the seal is compromised.
Where can I safely buy USP-grade BAC water online?
Buy from a supplier that publishes a per-lot Certificate of Analysis and ships in temperature-stable, tamper-evident packaging. Every Buy Bac Water USA batch is USP-grade, lab-tested, and COA-verifiable by batch code.
Why does a Certificate of Analysis test pH?
pH testing confirms the solution falls within an expected range (commonly 4.0–7.0), which helps verify the water is chemically stable and consistent with USP standards.