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Lot traceability

Certificate of Analysis lookup

Every ResearchWater lot is third-party tested for sterility, identity, pH, endotoxin (where applicable), and resistivity (where applicable). Enter the lot number printed on your vial to download the full Certificate of Analysis as a PDF.

Sample CofA

What you'll receive after lookup.

Certificate of Analysis

RW-BAC-30-2026-04-A1

Released · Pass
ProductBacteriostatic Water 30 mL · 0.9% benzyl alcohol
Lot #RW-BAC-30-2026-04-A1
Manufacturing date2026-04-08
Expiration2028-04-08 (24 months)

Test results

SterilityNo growth · USP <71> · 14-day membrane filtration · Pass
Endotoxin<0.05 EU/mL · Spec <0.5 EU/mL · Pass
pH5.4 · NIST-traceable calibration · Spec 4.5 – 7.0 · Pass
IdentityBenzyl alcohol 0.91% w/v · GC-FID · Spec 0.85 – 0.95% · Pass
ResistivityN/A — preserved aqueous SKU; bulk feed water 18.2 MΩ·cm at 25 °C
Tested byAtlas Analytical Labs · ISO/IEC 17025 · Cert. AAL-2026-00412
Released byM. Okafor, QA Manager · 2026-04-15

Sample CofA shown for illustration. Live lot lookups return a downloadable, signed PDF with the same data fields plus the testing lab's countersignature page.

CofA contents

What every CofA includes.

Test 01

Sterility USP <71>

14-day membrane filtration sterility test against fluid thioglycollate and soybean-casein digest media. Pass/fail with full incubation log.

Test 02

Endotoxin LAL

Kinetic chromogenic LAL assay per USP <85>. Reported in EU/mL with the assay range and the pass/fail spec for that SKU.

Test 03

Identity & potency

Where applicable, GC-FID identity and concentration of bacteriostatic agent (benzyl alcohol) reported with the in-spec range.

Test 04

pH / resistivity

NIST-traceable pH on aqueous SKUs; resistivity (MΩ·cm at 25 °C) on ultrapure SKUs. Both reported with calibration date and spec.

Standards

What we test against.

  • USP <1231> Water for Pharmaceutical Purposes — source water requirements, monograph water types, microbial and chemical attribute guidance.
  • USP <71> Sterility Tests — 14-day membrane filtration test in fluid thioglycollate and soybean-casein digest media.
  • USP <85> Bacterial Endotoxins Test — kinetic chromogenic LAL assay with documented sensitivity and inhibition/enhancement screening.
  • ASTM D1193 Reagent Water Specification — Types I through IV defined by resistivity, TOC, sodium, silica, and chloride limits.
  • NIST NIST-traceable pH calibration buffers (4.00, 7.00, 10.01) verified before each release run.