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PVDF membrane cartridges
PVDF Membrane Filter Cartridges
PVDF membrane cartridges use polyvinylidene fluoride membrane rated from 0.1 to 0.65 micrometres, available in hydrophilic and hydrophobic forms. PVDF combines broad chemical resistance with low protein binding, which suits aggressive streams and protein-bearing solutions that would foul or attack other membranes.
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Answer first
What PVDF Membrane Cartridges Are, and How They Are Specified
PVDF membrane cartridges use polyvinylidene fluoride membrane rated from 0.1 to 0.65 micrometres, available in hydrophilic and hydrophobic forms. PVDF combines broad chemical resistance with low protein binding, which suits aggressive streams and protein-bearing solutions that would foul or attack other membranes.
PVDF sits between PES and PTFE. It resists a wider range of chemistry than PES while remaining usable in aqueous duty when supplied in hydrophilic form, and it retains the low protein binding that matters in biological work.
Because both hydrophilic and hydrophobic grades exist under the same material name, the form has to be stated explicitly. A hydrophobic PVDF cartridge fitted where an aqueous stream was expected will not pass water without pre-wetting.
Specification
PVDF membrane cartridge specification
| Parameter | Typical value or range | Notes |
|---|---|---|
| Membrane | Polyvinylidene fluoride (PVDF) | Hydrophilic or hydrophobic grades |
| Ratings | 0.1, 0.22, 0.45, 0.65 µm | 0.22 µm for sterilising duty |
| Protein binding | Low | Suits protein-bearing streams |
| Chemical compatibility | Broader than PES, narrower than PTFE | Check the stream against the compatibility chart |
| Hydrophilic grade | Wets with water | For aqueous filtration |
| Hydrophobic grade | Requires pre-wetting for aqueous use | For gas and vent duty |
| Integrity testable | Yes | Required for sterilising duty |
| Steam sterilisable | Construction dependent | Confirm cycle limits on the datasheet |
Membrane
- Typical value or range
- Polyvinylidene fluoride (PVDF)
- Notes
- Hydrophilic or hydrophobic grades
Ratings
- Typical value or range
- 0.1, 0.22, 0.45, 0.65 µm
- Notes
- 0.22 µm for sterilising duty
Protein binding
- Typical value or range
- Low
- Notes
- Suits protein-bearing streams
Chemical compatibility
- Typical value or range
- Broader than PES, narrower than PTFE
- Notes
- Check the stream against the compatibility chart
Hydrophilic grade
- Typical value or range
- Wets with water
- Notes
- For aqueous filtration
Hydrophobic grade
- Typical value or range
- Requires pre-wetting for aqueous use
- Notes
- For gas and vent duty
Integrity testable
- Typical value or range
- Yes
- Notes
- Required for sterilising duty
Steam sterilisable
- Typical value or range
- Construction dependent
- Notes
- Confirm cycle limits on the datasheet
Typical values across the cartridge class. Compatibility and grade follow the datasheet of the cartridge quoted.
Selection guidance
State hydrophilic or hydrophobic on the purchase order
PVDF is the one membrane material in common use that is routinely supplied in both wetting forms, and the material name alone does not distinguish them. Ordering PVDF without stating the form is how a hydrophobic cartridge ends up in an aqueous line.
The symptom is unmistakable and easy to misdiagnose: almost no flow at normal pressure, with the filter appearing blocked from new. Before condemning a cartridge in that situation, confirm which grade was supplied.
Application mapping
Where PVDF Membrane Cartridges Are Used
Protein-bearing process streams
- Typical requirement
- Low binding with chemical resistance
- Indicated configuration
- Hydrophilic PVDF at the rating the process specifies
Aggressive aqueous chemistry
- Typical requirement
- Resistance beyond what PES tolerates
- Indicated configuration
- Hydrophilic PVDF selected on the compatibility chart
Gas and vent duty
- Typical requirement
- Water excluded from the membrane
- Indicated configuration
- Hydrophobic PVDF, or PTFE where chemistry demands it
Replacement and consumables
Replacement Intervals and the Signs It Is Due
Intervals are indicative planning figures. The signal in the last column is what should actually trigger the change.
| Duty | Typical interval | Signs it is due |
|---|---|---|
| Validated sterile filtration | Per batch or validated cycle | Failed integrity test, or end of the validated period |
| Process stream filtration | By throughput and differential | Differential pressure rise at constant flow |
| Gas and vent duty | Scheduled | Replace on schedule rather than on failure |
Validated sterile filtration
- Typical interval
- Per batch or validated cycle
- Signs it is due
- Failed integrity test, or end of the validated period
Process stream filtration
- Typical interval
- By throughput and differential
- Signs it is due
- Differential pressure rise at constant flow
Gas and vent duty
- Typical interval
- Scheduled
- Signs it is due
- Replace on schedule rather than on failure
Where the filter sits in a validated process, replacement is governed by your validation rather than by the media's tolerance.
Put this on a standing order
Once a plant has a year of running behind it, consumption for this item is predictable. Sending the plant list and last year's usage gets it scheduled against your maintenance calendar instead of ordered in an emergency at the point the plant is already out of specification.
Commercial terms
How This Category Is Quoted
Water treatment does not have a list price, and any supplier quoting one before seeing a feed analysis is quoting a different plant from the one you need.
Pricing basis
On request, and capacity-dependent. Plant pricing moves with capacity, feed water analysis and the recovery target; membranes, cartridges and resins are quoted per element, per lot or per litre of media.
Order quantity
From a single replacement element or a case of cartridges through to full plant scope. Consumable lines are quoted per box or per lot, and the lot size is stated on the quotation.
Lead time
Confirmed per line item at quotation stage. Stocked consumable lines and made-to-order plant differ substantially, so a single blanket lead time for the category would be misleading — the quotation carries the figure for each line.
Invoicing
GST invoice against company or institutional purchase order. Proforma issued where advance payment or internal approval requires it.
Delivery coverage
Despatch from Delhi NCR across India, including plant, project and institutional sites. Delivery city and site access are asked for at enquiry because both affect despatch mode.
Documentation
Technical datasheet for the item quoted, and a test certificate where the principal supplies one with that product. Tender and institutional documentation formats are prepared on request — send the format with the enquiry so the quotation is issued in a form you can submit without rework.
Request for quotation
Request a Quote — PVDF Membrane Cartridges
Fields marked with an asterisk are required. The technical fields are what usually decide whether you get a quotation on the first pass or three emails of clarification.
Frequently asked
PVDF Membrane Cartridges — Common Questions
What is the difference between hydrophilic and hydrophobic PVDF?
Hydrophilic PVDF wets with water and is used for aqueous filtration. Hydrophobic PVDF repels water and is used for gas, vent and breather duty.
Both are sold as PVDF, so the form must be stated on the order. A hydrophobic cartridge in an aqueous line shows almost no flow and is easily mistaken for a blocked filter.
Should I use PVDF or PES?
PES for straightforward aqueous and pharmaceutical duty, where it gives high flow and low protein binding at lower cost.
PVDF where the stream is chemically more aggressive than PES tolerates but does not warrant PTFE, and where low protein binding still matters.
Is PVDF suitable for sterilising filtration?
Yes, at 0.22 µm in an integrity-testable construction with supporting bacterial retention data.
As with any sterilising duty, the rating alone is not the claim — ask for the retention data and integrity test limits with the quotation.
Related Products and Categories
Specified alongside pvdf membrane cartridges, and the category this page sits in.
PES membrane cartridgesPTFE membrane cartridges for solvents0.22 micron filters for sterilising dutyBack to Cartridge Filters
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