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Laboratory diluents for research use. Not for direct human use.
Bacteriostatic Water 5 mL — box of 10 vialsBacteriostatic Water 5 mL — one vial (sold by the box of 10)
  • One or two reconstitutions a month
  • Spares for travel

Bac Water 5 mL

For light, occasional use: a 5 mL vial is used up long before day 28, so you pay for water you actually use.

Box of 10 vials · 5 mL each · BAC5

$14.00
1 box × $14.00 per box

No payment online: you send an order request, we confirm stock, lot and the total, then you pay. US shipping $9.90 per order; other countries quoted.

Not sure which size? Size Finder: your 28-day use → the right size and number of boxes

What's in the vial

In the vial
5 mL — sterile water with 0.9% (v/v) benzyl alcohol as preservative
Re-use
Yes: re-enter the vial; discard 28 days after first use
Keep it
Room temperature (15–25 °C), out of the light, never frozen
Sold as
Boxes of 10 vials — no single vials
Vial
Clear glass vial · grey butyl rubber stopper · aluminium flip-off seal example
Lot / use by
EXAMPLE-BW05-2608 · 2028-08 example · test results

Box prices

ProductBox1–19 boxes20+ boxes
Bacteriostatic Water 5 mL BAC510 vials$14.00 / boxquote

Good to know

Why not just buy 30 mL?
An opened vial is discarded after 28 days. If you use 5 mL a month, most of a 30 mL vial would be thrown away.

Shipping & returns — damaged, wrong or missing items are reshipped; a quality problem is refunded in full.

Lot, expiry and test results

Every release test with its method and limit, and the lot record for this size. The original certificate is e-mailed with your order confirmation.

Original file on request

Example data · not a real lot

Bacteriostatic Water 5 mL

Lot
EXAMPLE-BW05-2608
Manufactured
2026-08
Expiry
2028-08
Container
Clear glass vial · grey butyl rubber stopper · aluminium flip-off seal
CheckThis lotPass mark
AppearanceConforms (example)Clear, colorless solution
Water and benzyl-alcohol component identityConforms (example)Water grade conforms to the released specification and the preservative is identified as benzyl alcohol; component identity does not by itself establish concentration, sterility or finished-product status
Benzyl alcohol content0.91% v/v (example)0.9% ± 0.1% (v/v)
pH5.8 (example)5.0–7.0
Elemental impuritiesAll elements below limits (example)Cd NMT 0.2; Pb 0.5; As 1.0; Hg 0.3; Co 0.5; V 1.0; Ni 2.0; Li 5.0; Sb 1.0; Cu 5.0 ppm; sum of Cd, Pb, As, Hg, Co, V and Ni <4.0 ppm
Antimicrobial effectivenessMeets Category 1 criteria (example)Meets USP <51> Category 1 criteria for the tested released formulation; this result does not sterilize a contaminated vial or replace aseptic controls
Fill volume5.04 mL (example)5.00 mL/vial ±3.0%
Particulate matter≥10 µm: 120 / container; ≥25 µm: 8 / container (example)NMT 6000 particles ≥10 µm and NMT 600 particles ≥25 µm per container; essentially free from visible particulates
Bacterial endotoxins< 0.10 EU/mL (example)NMT 0.25 EU/mL
SterilityNo growth (14 days) (example)Sterile — no growth

The full certificate (PDF) for your lot is sent by our sales team. Get it with your order