WFI Beyond
Water for Injection, Beyond Compendial
Water for Injection engineered beyond the Ph. Eur./USP monograph · GMP (EU Annex 1) · backed by FDA DMF MF044505
WFI Beyond is a beyond-compendial grade of Water for Injection, controlled past the Ph. Eur./USP monograph and backed by FDA Drug Master File MF044505. WFI Beyond is purified and controlled to exceed the Ph. Eur./USP Water-for-Injection monograph on the attributes that decide an advanced biologic. The monograph is rooted in 1969, written for the medicine of that era; WFI Beyond is built for the medicine of today and tomorrow — and backed by a filed FDA Drug Master File (MF044505) you can reference in your own submission.
One partner, across the whole purity ladder. PAN-Biotech offers three matched water grades — Sterile Water for Cell Culture (research), WFI Quality Water (GMP, EP/USP) and WFI Beyond (beyond compendial, FDA DMF) — so the same partner carries you from research to GMP without changing supplier.
Why WFI Beyond
Ultra-low endotoxin
< 0.005 EU/mL — more than 50× below the monograph limit.
Very low organic carbon
< 0.05 mg/L — more than 10× below the limit.
Exceptional conductivity
< 0.2 µS/cm — more than 5× below the limit.
Nuclease-free; nitrosamine-assessed
RNase & DNase not detected; nitrosamine risk assessed to EMA guidance.
A first: full elemental profile
All 24 ICH Q3D elemental impurities quantified on every CoA.
Sterile by design
0.1 µm filtration, aseptic Grade A filling and gamma irradiation to SAL 10⁻⁶.
Specifications at a glance
| Property | Detail |
|---|---|
| Endotoxin | < 0.005 EU/mL (Ph. Eur. 2.6.14) |
| Total organic carbon | < 0.05 mg/L — more than 10× below the limit |
| Appearance | Clear, colourless liquid |
| Conductivity | < 0.2 µS/cm (20 °C) |
| Nuclease activity | RNase & DNase not detected |
| Elemental impurities | 24 elements, ICP-MS, to ICH Q3D — values on every CoA |
| Sterility | Sterile-filtered 0.1 µm; aseptically filled (Grade A); gamma-irradiated to SAL 10⁻⁶ |
| Basis | Water for Injection, Ph. Eur. 0169 and beyond compendial · GMP (EU Annex 1) |
| Regulatory | FDA Type IV DMF · MF044505 |
Conductivity and total organic carbon are measured continuously, online in the storage loop ahead of filling. Manufactured by PAN-Celltech GmbH, Aidenbach, Germany. Single-use, gamma-irradiated from production to delivery.
The WFI Beyond Standard, defined
"Water for Injection" is a pharmacopoeial grade with a defined monograph - limits on conductivity, organic carbon and endotoxin. That is a meaningful bar, but it is a floor, not a ceiling: the European standard dates back to the first European Pharmacopoeia, published in 1969, its limits framed in, and for, the medicine of that era, and it sets no limit at all on the trace metals and other impurities that quietly degrade a modern biologic. A standard is not a claim - it is something written down, measurable and demandable. The proof reads in three columns - the pharmacopoeia floor, the WFI Beyond specification, and the actual result measured on a real production batch - so the gap is visible, not asserted:
| Attribute | Ph. Eur. 0169 limit | WFI Beyond spec | Result, real batch |
|---|---|---|---|
| Conductivity (20 °C) | ≤ 1.1 µS/cm | ≤ 0.2 µS/cm | 0.128 µS/cm |
| Total organic carbon | ≤ 0.5 mg/L | ≤ 0.05 mg/L | 0.011 mg/L |
| Endotoxin | ≤ 0.25 EU/mL | < 0.005 EU/mL | < 0.005 EU/mL |
| Elemental impurities | not in monograph | < ICH Q3D limit | 24 elements by ICP-MS; 22 < LOQ, Sb & Cr thousands-fold below limit |
| Nuclease activity | not in monograph | none detected | RNase & DNase not detected |
| Sterility | – | sterile · single-use | no growth |
| Animal origin | – | animal-component-free | TSE/BSE safety (signed declaration) |
| Regulatory | – | Type IV DMF | MF044505 (FDA excipient) |
These are not target or typical figures: each is the actual result measured on a real production batch (Art. CT-981000, Lot 2560826), as reported on its Certificate of Analysis. The WFI Beyond specification alone sits >5x below the pharmacopoeia on conductivity, 10x below on TOC and >50x below on endotoxin - and the measured batch result is lower still. LOQ = limit of quantification, the level below which a value cannot be reliably measured, i.e. effectively "not detectable".
Applying ICH Q3D to water is a first: the WFI monograph does not call for it, and it is a finished-drug standard. WFI Beyond runs it anyway - all 24 elemental impurities by ICP-MS against the ICH Q3D parenteral limits, the actual values reported on every Certificate of Analysis, not a pass/fail. And the questions the monograph never asks are answered up front: WFI Beyond carries a signed BSE/TSE & ICH Q3 declaration - manufactured from raw materials of non-animal origin and out of scope of the EMA TSE/BSE guidance (EMA/410/01 Rev. 3), with residual solvents (ICH Q3C), nitrosamines (EMA) and elemental impurities (ICH Q3D) risk-assessed across every product-contact material.
The 24 elements, in full
This is the heart of the standard, and the part that is genuinely new: the Ph. Eur./USP water monograph sets no limit on elemental impurities at all. The WFI Beyond Standard gives each of the 24 ICH Q3D elements a defined specification and reports its measured value on every lot. The specification is set conservatively - at 50% of the ICH Q3D parenteral limit for each element as a launch criterion - so it is reliably met and can only be tightened over time, never widened. All values in µg/L; elements in ICH Q3D class order.
| Element | Class | ICH Q3D limit (µg/L) | WFI Beyond spec (µg/L) | LOQ (µg/L) | Result, real batch (µg/L) |
|---|---|---|---|---|---|
| Arsenic (As) | 1 | 1 500 | ≤ 750 | 0.30 | < LOQ |
| Cadmium (Cd) | 1 | 200 | ≤ 100 | 0.04 | < LOQ |
| Mercury (Hg) | 1 | 300 | ≤ 150 | 0.06 | < LOQ |
| Lead (Pb) | 1 | 500 | ≤ 250 | 0.10 | < LOQ |
| Cobalt (Co) | 2A | 500 | ≤ 250 | 0.10 | < LOQ |
| Nickel (Ni) | 2A | 2 000 | ≤ 1 000 | 0.40 | < LOQ |
| Vanadium (V) | 2A | 1 000 | ≤ 500 | 0.20 | < LOQ |
| Silver (Ag) | 2B | 1 000 | ≤ 500 | 0.20 | < LOQ |
| Gold (Au) | 2B | 10 000 | ≤ 5 000 | 2.0 | < LOQ |
| Iridium (Ir) | 2B | 1 000 | ≤ 500 | 0.20 | < LOQ |
| Osmium (Os) | 2B | 1 000 | ≤ 500 | 0.20 | < LOQ |
| Palladium (Pd) | 2B | 1 000 | ≤ 500 | 0.20 | < LOQ |
| Platinum (Pt) | 2B | 1 000 | ≤ 500 | 0.20 | < LOQ |
| Rhodium (Rh) | 2B | 1 000 | ≤ 500 | 0.20 | < LOQ |
| Ruthenium (Ru) | 2B | 1 000 | ≤ 500 | 0.20 | < LOQ |
| Selenium (Se) | 2B | 8 000 | ≤ 4 000 | 1.60 | < LOQ |
| Thallium (Tl) | 2B | 800 | ≤ 400 | 0.16 | < LOQ |
| Barium (Ba) | 3 | 70 000 | ≤ 35 000 | 14.00 | < LOQ |
| Chromium (Cr) | 3 | 110 000 | ≤ 55 000 | 22.00 | ~0.3 |
| Copper (Cu) - key for antibody oxidation | 3 | 30 000 | ≤ 15 000 | 6.00 | < LOQ |
| Lithium (Li) | 3 | 25 000 | ≤ 12 500 | 5.00 | < LOQ |
| Molybdenum (Mo) | 3 | 150 000 | ≤ 75 000 | 30.00 | < LOQ |
| Antimony (Sb) | 3 | 9 000 | ≤ 4 500 | 1.80 | 0.7-2.6 |
| Tin (Sn) | 3 | 60 000 | ≤ 30 000 | 12.00 | < LOQ |
ICH Q3D limit = parenteral permitted daily exposure expressed as a concentration (Option 1, 10 g/day). The result column holds the actual values measured on a real production batch (Art. CT-981000, Lot 2560826), not typical or target figures. LOQ = limit of quantification of the accredited laboratory - the lowest concentration the validated ICP-MS method can reliably measure (shown per element, as on the Certificate of Analysis); results below it are reported as "< LOQ". On this lot 22 of the 24 were < LOQ; only antimony and chromium registered, each far below the WFI Beyond spec.
The two metals that oxidise an antibody - copper and iron
Of the 24 elements, two matter to a monoclonal antibody out of all proportion to the rest, for one reason: they catalyse oxidation. Oxidative damage to an antibody is overwhelmingly metal-catalysed - Fenton chemistry, in which a redox-active metal ion cycles between oxidation states and, with the traces of peroxide and oxygen present in any process, generates radicals that attack methionine, histidine and tryptophan. What follows is the failure mode that ends programmes late: charge variants, loss of potency, fragmentation and, above all, aggregation - the developability problems that appear not on day one but deep in CMC, where they are hardest and most expensive to fix.
The two catalysts are copper and iron. Copper is the most potent per mole - it binds histidine-rich sites on the antibody and does targeted damage at parts-per-billion levels; iron is the most ubiquitous, leaching from stainless steel and water systems into everything downstream. And this is the gap the WFI Beyond Standard closes: the water monograph tests neither metal, and ICH Q3D - a toxicity framework - covers copper but not iron. A water can be fully compendial and fully ICH Q3D-clean and still carry the iron that oxidises an antibody. WFI Beyond measures both - on the reference lot, copper and iron were both below the limit of quantification - reported on the Certificate of Analysis and, for the oxidation pair specifically, in a dedicated oxidation-metals addendum.
Copper and iron are the two metals that oxidise an antibody. One of them - iron - no water monograph and not even ICH Q3D requires you to measure. WFI Beyond measures both, and proves them lot by lot.
A standard you can point to - and pass on
The most valuable component in a process is often the one no one can see. The WFI Beyond Standard makes the invisible nameable: a defined water specification a developer can design to, a CDMO can standardise on, a sponsor can carry into a filing, and a partner or investor can recognise in diligence.
Built on WFI Beyond is that mark: a short, honest signal that the water beneath a process meets the standard set out here - beyond compendial, all 24 ICH Q3D elements specified and measured, DMF-backed, proven lot by lot.
Formats and article numbers
Bottles of 500 ml and 1000 ml, and single-use, gamma-irradiated bags from 1 L to 1000 L. Customized bag, tubing and connector configurations on agreement.
WFI Beyond - GMP, beyond-compendialCT-98 series
Everything a qualification needs
Specification, a representative Certificate of Analysis, the BSE/TSE & ICH Q3 declaration, and a DMF Letter of Authorization on request - plus the full standard in In-Depth Edition 01.
DMF backing applies to WFI Beyond (MF044505) and DPBS (MF044371). Manufactured to GMP in an EU Annex 1 facility (a capability, not a certification); ISO 9001-certified QC laboratory. WFI Beyond is opt-in and is an excipient for further manufacturing, not Sterile Water for Injection for direct human use.
Applications
Key terms
| Term | Meaning |
|---|---|
| WFI | Water for Injection — the pharmacopoeial grade of water permitted in injectable medicines (Ph. Eur. monograph 0169). |
| Endotoxin | Pyrogenic fragments of bacterial cell walls; the Ph. Eur. WFI limit is < 0.25 EU/mL. |
| TOC | Total organic carbon — a measure of organic purity; the WFI monograph limit is 0.5 mg/L. |
| Nuclease-free | No detectable RNase or DNase activity — protects RNA/DNA and mRNA payloads. |
| ICH Q3D | The international guideline that sets safe limits for 24 elemental (metal) impurities in medicines. |
| SAL 10⁻⁶ | Sterility Assurance Level of one-in-a-million — the pharmaceutical standard for terminal sterilisation. |
| DMF | Drug Master File — confidential data filed with the FDA that a customer references in their own submission via a letter of authorization. |
| GMP (EU Annex 1) | Good Manufacturing Practice for the manufacture of sterile medicinal products in the EU. |
WFI Beyond, answered
What makes it beyond compendial
What makes WFI Beyond “beyond compendial”?
It is controlled to exceed the Ph. Eur./USP WFI monograph on endotoxin (more than 50× below the limit), total organic carbon (more than 10× below), conductivity (more than 5× below) and nuclease activity, and adds elemental-impurity control and a nitrosamine assessment the monograph does not require.
What is the difference between WFI Quality Water and WFI Beyond?
Both are Water for Injection quality, made by a membrane-based process, not distillation. WFI Quality Water meets the Ph. Eur./USP monograph. WFI Beyond is engineered beyond it: endotoxin more than 50× below the limit, TOC 10× below, conductivity more than 5× below, nuclease-free, all 24 ICH Q3D elemental impurities specified and measured on every lot, and backed by a filed FDA Type IV (excipient) DMF (MF044505).
Is WFI Beyond backed by a Drug Master File?
Yes — a filed FDA Type IV Drug Master File, MF044505. You can reference our confidential manufacturing and quality data in your own submission through a simple letter of authorization.
Is it nuclease-free?
Yes. RNase and DNase are not detected, protecting mRNA and nucleic-acid payloads. Nitrosamines are addressed by a risk assessment to current EMA guidance rather than a blanket ‘free’ claim.
Does WFI Beyond measure copper and iron?
Yes — both. Copper and iron are the two metals that catalyse antibody oxidation (Fenton chemistry). The water monograph limits neither, and ICH Q3D covers copper but not iron. WFI Beyond measures both and reports them on the Certificate of Analysis; on the reference lot copper and iron were both below the limit of quantification.
Is the product compendial WFI or “WFI-quality water”?
The product WFI Beyond meets all requirements for WFI in bulk according to the currently valid monograph 0169 of the European Pharmacopoeia and is therefore compendial. Since aluminum is not tested, it is not suitable for the manufacture of dialysis solutions. WFI Quality Water is released to EP/USP WFI specifications for research and further manufacturing, but is not the finished “Sterile Water for Injection” dosage form.
How does WFI differ from Purified Water (PW)?
The acceptance criteria for microbiological monitoring and conductivity are set significantly tighter for WFI/WFI Beyond. In addition, WFI/WFI Beyond is subject to a bacterial endotoxin limit (< 0.25 EU/mL), which Purified Water is not.
Manufacturing and analysis
How is sterility assured?
The bulk is sterile-filtered through a 0.1 µm filter — tighter than the usual 0.2 µm — and filled aseptically in Grade A; the single-use containers are supplied pre-sterilised (gamma-irradiated to a Sterility Assurance Level of 10⁻⁶) as a prerequisite for filling.
Is the WFI produced by distillation or by a membrane-based process?
By a membrane-based process, not distillation: reverse osmosis, ultrafiltration, electrodeionization and a final sterile filtration. The water meets/exceeds Ph. Eur./USP requirements.
Which analytical methods and pharmacopoeial chapters are applied?
For WFI Quality Water: conductivity Ph. Eur. 2.2.38, TOC 2.2.44, bacterial endotoxins 2.6.14 (Method C), sterility 2.6.1 / USP-NF <71>. Elemental impurities are determined by ICP-MS per ICH Q3D (WFI Beyond). Testing is performed in PAN’s ISO 9001-certified QC laboratory. Nuclease freedom (WFI Beyond) is verified by fluorometry.
Do you provide a Certificate of Analysis, and what does it cover?
Yes — a CoA on every lot. For WFI Beyond it reports appearance, conductivity, TOC, endotoxin, RNase/DNase activity, sterility and all 24 ICH Q3D elemental impurities by ICP-MS, sampled at the beginning and end of fill.
Intended use
Can the WFI be used in clinical and commercial manufacturing?
Yes, the product is intended for further manufacturing, including of medicinal products. It is not approved for direct use in humans.
Is it suitable for the final formulation of a parenteral drug product?
The product is intended for further manufacturing, including of parenteral medicinal products. For example, it can be used to prepare formulation buffers. It is not approved for direct use in humans (e.g., reconstitution of lyophilized medicinal products for injection).
Can it be used directly as an excipient in a medicinal product?
Yes, the product is intended for further manufacturing, including of medicinal products, and can be used without further processing. It is not approved for direct use in humans.
Formats, bags and connectors
What sizes are available?
Bottles of 500 ml and 1000 ml, and single-use bags from 1 L to 1000 L (CT-98 series).
Which connectors and connection systems can be supplied?
Single-use 2D/3D bags can be supplied with customizable tubing lengths and connectors; specific connector types on request/agreement.
Can customized bag, tubing, or connector configurations be provided?
Yes. Customized bag, tubing and connector configurations are available on agreement.
Quality agreements and supplier qualification
Can PAN-Biotech enter into customer-specific quality agreements?
Yes, a customer-specific Quality Assurance Agreement (QAA) is possible and needs to be discussed individually.
Does PAN-Biotech offer a formal change-notification agreement?
Yes, in case there is a respective agreement, customers are notified of quality-relevant changes affecting the product under a change-notification agreement.
Is a supplier qualification package available?
Yes, suppliers and service providers are qualified and audited in accordance with internal SOPs.
Which documents does PAN-Biotech provide to support supplier qualification?
Supplier Qualification Guide, ISO certificates, additional documents information upon request.