Stability Data
Bacteriostatic Water Shelf Life
USP-grade bacteriostatic water has a 24–36 month shelf life unopened at 15–30 °C and a 28-day post-puncture window when refrigerated at 2–8 °C. Stability is validated via USP release-test panel at defined intervals.
Direct Answer
Shelf life: 24–36 months unopened, 28 days after first puncture (refrigerated 2–8 °C). BAC Water Depot publishes manufacture, expiration, and retest dates on every per-lot CoA, with stability validated against USP <71>, <85>, <621>, <788>, <791>, and <1207>.
Frequently Asked Questions
What is the shelf life of bacteriostatic water?
Bacteriostatic water shelf life is typically 24 to 36 months from the manufacture date when stored unopened at controlled room temperature (15–30 °C / 59–86 °F). The exact expiration date is printed on the vial label and documented on the per-lot Certificate of Analysis. After first puncture, the 28-day post-opening rule applies regardless of the original lot expiration.
How is bacteriostatic water shelf life determined?
Shelf life is established through validated stability studies measuring sterility, benzyl alcohol concentration, particulate matter, container integrity, and pH at defined intervals (typically 3, 6, 9, 12, 18, 24, and 36 months) under controlled storage conditions. A retest date is also assigned — typically 12 months from manufacture — at which point retained samples are re-tested to confirm continued compliance with spec.
What is the retest date on a Certificate of Analysis?
The retest date is the point at which manufacturer-retained samples from the lot are re-tested for sterility, endotoxin, benzyl alcohol concentration, and container integrity to confirm continued compliance with spec. Retest is typically scheduled at 12 months from manufacture. Successful retest extends confidence in the lot through its full expiration. BAC Water Depot publishes both manufacture and retest dates on every per-lot CoA.
What affects bacteriostatic water shelf life?
Three factors: (1) storage temperature — sustained exposure above 30 °C accelerates degradation; (2) container integrity — a compromised crimp seal or cracked vial invalidates the lot; (3) light exposure — though USP-grade product is reasonably light-stable, prolonged direct sunlight should be avoided. Maintain stable room temperature, original packaging, and an intact tamper-evident seal until first use.
Does freezing affect bacteriostatic water?
Yes — bacteriostatic water should not be frozen. Freezing can compromise the glass vial's container integrity (USP <1207>) and alter the benzyl alcohol/water phase relationship. If a shipment is exposed to freezing temperatures in transit, inspect for cracked vials or broken seals and contact the supplier for replacement. BAC Water Depot ships in insulated packaging during winter months.
How long can I store bacteriostatic water before using it?
Unopened: store at 15–30 °C until the printed lot expiration date (typically 24–36 months from manufacture). After first puncture: refrigerate at 2–8 °C and discard remaining product after 28 days. BAC Water Depot ships fresh lots — typical shelf life remaining at delivery is 20+ months on retail orders.
