If a supplied lot fails agreed specifications, we’ll replace it at no cost or refund its purchase price in full.
Quality test failed? Free replacement or full refund.
Off-spec? Free replacement or full refund.
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Research reagent · Research use only
Preservative-free sterile-water reconstitution diluent (single-use)
Price, MOQ and lead time come in your written quote — usually within 24 hours. No account needed.
Compound facts
| Name | Sterile Water |
|---|---|
| CAS number | 7732-18-5 |
| PubChem CID | 962 |
| Molecular weight | 18.02 g/mol |
| Appearance | Clear, colorless liquid |
| Purity specification | ≥ 99.0% |
| Batch COA | Every lot has its own batch COA; the tests are listed on it. |
| Storage | Room temperature |
| Fill sizes | 3 ml · 5 ml · 10 ml · 30 ml |
| Pack | 10 vials per kit |
| MOQ | On request |
| Lead time | 7–14 days |
| Use | Research use only — not for human or veterinary use |
Identity data from the Lyochem product catalogue, checked against PubChem and registry records. The batch COA of your lot is the record for that lot's results. How to verify a COA
Lot documentation
Every lot has its own batch COA; the tests performed are listed on it.
Values belong to the lot. Ask for the COA of the offered lot before you order.
Independent test fails? Full refund. How it works
Overview
Sterile Water for Injection (SWFI) is the preservative-free, single-use reconstitution diluent. The absence of any preservative — the distinction from Bacteriostatic Water — makes it the appropriate choice in two cases: preparations intended for single use within a short window after reconstitution, where multi-use preservation is unnecessary; and peptides whose chemistry or downstream application is incompatible with benzyl alcohol or other preservatives. It is also the diluent of choice where a sterile-filled finished preparation builds its preservation system into the formulation rather than the diluent. It is supplied as a characterized ancillary diluent rather than a research-target molecule. Lyochem supplies SWFI in sterile vial formats to USP Water for Injection monograph specifications; sterility and bacterial endotoxin (LAL) results are available on request and listed on the batch COA when tested; EP / BP / JP equivalents are available on request. Because there is no preservative, an opened vial has a limited multi-use life (microbial ingress after septum puncture is the limiting factor), so SWFI is matched to single-use or short-window preparation. Match the diluent to the peptide's stability profile: acidic-pH-requiring peptides use the 0.6% acetic-acid diluent; preservative-incompatible peptides use SWFI; preservative-compatible peptides for multi-use can use BAC Water.
Applications & buyer fit
Solvents and ancillaries are the bench-support consumables a lab pairs with a reference standard once it leaves the freezer — bacteriostatic and sterile water, 0.6% acetic-acid water, and the benzyl-alcohol preservative used in multi-use diluent prep. These are diluents and process auxiliaries rather than research targets, so the documentation is diluent / solvent-grade (component identity, sterility, endotoxin, osmolality where applicable, pharmacopeia monograph) rather than the peptide HPLC + MS + sequence packet. Diluent selection follows the peptide's stability profile: acidic-pH-requiring proteins use the acetic-acid water; preservative-incompatible peptides use sterile water; preservative-compatible peptides for multi-use vials use BAC water.
Academic Laboratories
Universities, medical schools, and government research institutes qualifying a reference standard for a method-development or in vivo workflow.
Core Facilities & Instrumentation Cores
Shared instrumentation cores, mass-spec facilities, and departmental analytical labs holding reference standards for cross-PI method validation and reagent qualification.
Contract Research Organisations (CROs)
CROs running preclinical and translational studies on behalf of academic, biotech, or pharma sponsors who need traceable reference material across multi-site campaigns.
Every lot has its own batch-specific CoA — RP-HPLC purity, ESI-MS identity, bacterial endotoxin and fill amount, plus any analytical scope agreed at quote stage — tied to the exact lot you receive.
Review a representative batch CoA before you order, so you can confirm the packet matches what your method or sponsor audit needs.
Supplied strictly as a research reagent to research institutions — not a finished dosage form and not for human administration. Buyer qualification runs at the inquiry stage.
Regulatory note
Preservative-free reconstitution diluent for single-use preparations; supplied for Research Use Only. Verify sterility, pyrogen (LAL), and injectable-grade compliance with the destination market's requirements before use.
Frequently asked questions
Benzyl alcohol (the preservative in BAC Water) associates with the surface of some short peptides, which can shift solubility, accelerate aggregation, or interfere with benzyl-alcohol-sensitive downstream assays. Preservative-free SWFI removes that concern entirely, at the trade-off that the opened vial must be used within a short window because nothing inhibits microbial growth after septum puncture. For documented benzyl-alcohol-compatible peptides, BAC Water is operationally simpler; for new or untested peptides, SWFI is the conservative default.
Lyochem supplies SWFI to the USP Water for Injection monograph (strict limits for total organic carbon, conductivity, microbial limits, and bacterial endotoxin); sterility results are available on request and listed on the batch COA when tested. International equivalents (EP, BP, JP) are available on request; specify the required monograph at quote stage so the documentation references it.
SWFI is preservative-free and neutral but unbuffered and non-isotonic, suited to single-use preparation and preservative-incompatible peptides. Saline adds isotonicity (≈ 300 mOsm/L) for physiological compatibility, and BAC Water adds benzyl-alcohol preservation for multi-use vials. The peptide's recommended diluent is noted on its COA; the three cover the common reconstitution cases.
Send any vial from your order to an independent laboratory of your choice. If the report shows the product does not meet the specification on its COA — purity below the stated minimum, or an identity that does not match — share the report with our sales team and we refund that product in full.
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