3 mL & 10 mL research-use vials. Clear pack pricing.
Review the available COA reports. Find your next laboratory supply.
For research use only. Not for injection or human use.
Bacteriostatic water.
Clarity in every order.
About our company
Built to raise the standard of an industry that needed one.
BuyBacWaterUSA offers UltraBac bacteriostatic water in 3 mL and 10 mL vials for laboratory research. Compare single vials, multipacks and 100-vial packs, and review the available lot-specific laboratory reports before ordering. Product details, pack pricing and shipping options are available online.
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Choose 3 mL or 10 mL vials for laboratory research.
$6.99
UltraBac Bacteriostatic Water 3 mL
A compact 3 mL vial option for laboratory research. Compare the single vial with multipack options and review the available product documentation.
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$8.99
UltraBac Bacteriostatic Water 10 mL
A 10 mL vial option for laboratory research. Choose a single vial or a multipack to match your laboratory’s purchasing needs.
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3 mL or 10 mL Bacteriostatic Water vials below.
Lab-Verified Authenticity
Review the available lot-specific COA reports.
Our COA page provides third-party laboratory reports for the lots shown. Review each report for its product, lot number, test date, methods and measured results. Reported tests include benzyl alcohol content, pH and endotoxin. Results apply to the tested sample and should not be read as proof of tests that are not listed.
View Lot-Specific COA ReportsUnderstand The Essentials
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· 01
What is Bacteriostatic Water?
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.
0.9% Benzyl Alcohol
Multiple Sampling Safe
Up to 28 days
· 02
Precautions of using BAC water
In laboratory scenarios, bacteriostatic water requires strict precautions to avoid ruining research data and biological samples. It must never be introduced into cell cultures or enzymatic assays, as the 0.9% benzyl alcohol preservative kills living cells and denatures delicate proteins. Researchers must also exclude it from analytical testing like HPLC or UV spectroscopy because the alcohol molecule absorbs light and causes severe data interference. Finally, the vial must be discarded exactly 28 days after the first needle puncture due to preservative degradation, and the solution must be checked for chemical compatibility to ensure it does not precipitate the target research compound.
Sterile handling
Strict expiry
Inspect clarity
· 03
Research application of BAC Water
Bacteriostatic Water is commonly used in laboratory environments for the reconstitution and preservation of lyophilized research compounds, peptides, and proteins. The addition of 0.9% benzyl alcohol helps reduce bacterial growth, allowing researchers to sample multiple times from the same vial when handled using appropriate laboratory procedures.
This makes Bac Water suitable for:
• Reconstituting lyophilized research compounds
• Dissolving powdered peptides for laboratory analysis
• Preparing protein samples for research workflows
• Supporting repeated sampling from the same vial
• Maintaining laboratory consistency during research procedures
Product Specifications
Everything on the label
| Volume (mL) | 3 mL / 10 mL |
|---|---|
| Material | USP Type I borosilicate glass vial · butyl rubber stopper |
| Formulation | Water for base + 0.9% Benzyl Alcohol preservative |
| Packaging Standards | Sterile multi-dose vial · sealed, tamper-evident, aseptically filled |
| Storage Temperature | 20–25°C (68–77°F), away from direct light |
| Shelf Life | 24 months unopened · 28 days after first puncture |
| Quality Control / Lot Number | Batch-tracked · unique lot code · Certificate of Analysis per lot |
Compare Formulations
Product comparisons & formulations
| Property | BAC Water | Sterile Water |
|---|---|---|
| Preservative | 0.9% Benzyl Alcohol | None |
| Sterility | Sterile & bacteriostatic | Sterile only |
| Multi-sampling safe | Yes — up to 28 days | No — single use |
| Best for | Repeated reconstitution | One-time dilution |
| Property | BAC Water | Saline / Bacteriostatic Saline |
|---|---|---|
| Composition | Water + 0.9% benzyl alcohol | 0.9% sodium chloride (± preservative) |
| Contains salt (NaCl) | No | Yes |
| Preservative | Benzyl alcohol | Only in bacteriostatic saline |
| Multi-sampling safe | Yes — up to 28 days | Depends on preservative |
| Property | BAC Water | Distilled / Purified / WFI |
|---|---|---|
| USP grade | Yes (USP) | Only WFI; distilled/purified are not |
| Preservative | 0.9% Benzyl Alcohol | None |
| Sterile | Yes | WFI yes · distilled/purified not guaranteed |
| Multi-sampling safe | Yes — up to 28 days | No |
How it's made
Our manufacturing process
Multi-stage reverse osmosis
Source water is purified through successive RO membranes to strip out contaminants.
0.9% benzyl alcohol
The precise bacteriostatic concentration is blended under sterile conditions.
Aseptic vial filling
Vials are filled and sealed in a controlled cleanroom to protect sterility.
Lab test & COA
Every lot is third-party tested and issued a Certificate of Analysis before shipping.
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From the Lab Journal
Guides & Research
Answers
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 sterile 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 tamper-evident packaging. Every Buy Bac Water USA batch is USP-grade, lab-tested, and COA-verifiable by batch code.