PTFE Membrane Filter Cartridge Supplier in India

A filtration element built from polytetrafluoroethylene membrane, pleated into a standard cartridge envelope with end caps that seat into a matching housing. PTFE is chosen mainly for its chemical-resistance characteristics, which let it handle acids, alkalis and solvents that would attack other membrane materials.

It is supplied in two distinct forms. Hydrophobic PTFE repels water and is used for gas, air and tank-vent duty. Hydrophilic PTFE is surface-modified to wet out and pass liquid, and is used for aqueous, solvent and chemical filtration. The two are not interchangeable, so the form is part of the specification rather than a detail.

Whether the membrane repels water or wets with it. Hydrophobic PTFE will not allow aqueous liquid through without substantial applied pressure, which is exactly the property wanted on a vent: gas passes freely while moisture is held back, so the vent keeps working in humid service.

Hydrophilic PTFE has been surface-modified so liquid wets the membrane and flows through it, while the underlying chemical resistance is retained. That combination is why it is specified for solvent and aggressive-chemistry liquid duty rather than a conventional hydrophilic membrane. Putting either in the other's job fails: a hydrophobic element will not pass your liquid, and a hydrophilic element on a vent blocks as soon as condensate reaches it.

Hydrophobic PTFE, because a vent has to keep passing gas in service that is often humid or condensing, and a wettable membrane would block. The pore rating follows the objective — 0.22 micron where the vent is protecting a vessel from airborne contamination, coarser where the duty is particulate only.

Sizing matters more than on most cartridges. A vent must pass gas at least as fast as liquid leaves the vessel, or the tank goes into vacuum — and tanks are considerably weaker in vacuum than in pressure. Size on the fastest transfer rate the vessel will see plus any steam or CIP flow, not on tank volume. In condensing service a heated or jacketed housing keeps the membrane dry, and the element should be dried after steam sterilisation before the vessel returns to transfer duty.

Hydrophilic PTFE, where the selected product is designed and documented for that fluid. It wets with liquid while retaining the chemical resistance that made PTFE the choice, which is what suits it to solvents, acids, alkalis and reagents.

One caution is worth more than any general recommendation: confirm compatibility against the whole cartridge, not the membrane. Support layers, cage, core, end caps and O-rings are usually polypropylene or another polymer, and on aggressive chemistry those commonly reach their limit before the PTFE does. The seal material in particular is frequently the weakest component and the easiest to specify wrongly. No PTFE cartridge should be treated as universally chemically compatible.

Pore rating, and therefore what each is used for. A 0.45 micron element suits pre-filtration, particulate reduction and clarification. A 0.22 micron element is the rating conventionally associated with sterilizing-filtration and critical gas or vent workflows, where the exact product is validated for that use.

They are frequently used together rather than as alternatives, with a coarser stage carrying the bulk load ahead of the finer one. Note also that flow through a 0.22 element is materially lower than through a 0.45 at the same size, which matters more on gas and vent duty than most buyers expect — check the pressure drop at your intended flow before fixing the size.

They describe how the cartridge seals into the housing. DOE — double open end — is a plain element sealed by compression between plates. Code 7 has a 226 O-ring at one end with a bayonet lock and a fin or spear at the other, positively locating the element so it cannot lift or bypass under flow or a pressure surge. Code 3 uses a 222 O-ring with a flat end.

The codes are not interchangeable, and a Code 7 element will not seat in a Code 3 or DOE housing. Where a defined retention is the point, positive O-ring retention is normally specified, because a compression seal that relaxes leaves a bypass path around the membrane and the rating then means nothing. Confirm the code, and the seal material, against the housing before ordering.

A non-destructive measurement on the installed filter, correlated by the manufacturer to the retention testing performed on that product, confirming the membrane and its seals are intact and that the assembly matches the condition the data applies to.

The method depends on the form. A wetted hydrophilic filter is generally tested by bubble point, diffusion or pressure hold. A hydrophobic filter cannot simply be water-wetted the same way, so hydrophobic elements are commonly tested by a water intrusion method or by an alcohol-based wetting procedure, depending on the product. Because both the method and its limits are product-specific, they must come from that item's own guide rather than from a general figure. An integrity test confirms the filter is intact; it does not by itself establish that your process is validated.

Datasheets, validation guides, integrity-test guidance, chemical compatibility information, extractables or biological-safety documentation and Certificates of Analysis can be coordinated where the relevant manufacturer issues them for the specific product.

They are not available for every product or brand, and their scope differs considerably. On PTFE specifically, the compatibility document is the one worth requesting early, because it is what tells you whether the supports and seals suit your chemistry rather than only the membrane. State what your file needs at enquiry and availability can be confirmed for the specific item before an order is placed.

Sourcing enquiries are supported for reputed brands including Sartorius, Pall, Merck Millipore, Parker domnick hunter, 3M, Cobetter and Graver, along with equivalent options, subject to availability, technical compatibility, documentation and buyer requirement.

This does not indicate authorised distribution, official dealership or an exclusive partnership with any brand. An equivalent is matched on PTFE form, pore rating and its stated basis, full materials of construction, dimensions, end-cap code and seal material. On a regulated process or a critical vent, substituting a filter is a change to a qualified arrangement, so whether an equivalent is acceptable is your QA or engineering function's determination rather than a sourcing question.

Yes. Supply and project coordination run from Delhi NCR across Gujarat, Maharashtra, Tamil Nadu, Telangana, Karnataka, West Bengal and other industrial and pharmaceutical clusters, covering production, pilot, laboratory and institutional requirements.

Cartridges are supplied individually packaged and should be stored sealed, clean and dry within the temperature range the manufacturer states — hydrophobic elements in particular should not be allowed to become wetted in storage. Lead time is confirmed per line item at quotation stage; commonly held ratings move quickly, while specific brands, capsule formats and documented product lines are often imported to order.