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Filtration · PTFE membrane

PTFE membrane

Surface filtration instead of depth. A microporous PTFE membrane laminated to polypropylene felt — a sharp cut point, cake that releases cleanly, and no fibre migration at all

Specification

PTFE membrane felt

Media codePTM
ConstructionMicroporous PTFE membrane laminated to a polypropylene needle-felt substrate
Filtration modeSurface — solids are retained on the membrane face, not within the felt
Standard sizeSize 2 — φ180 × 810 mm, 0.5 m², 17 L
Other sizesSize 1 (0.25 m², 8 L) · Size 3 (0.09 m², 1.3 L) · Size 4 (0.16 m², 2.5 L)
Ratings1–25 micron, with sub-micron available
Max. temperature90 °C continuous, 100 °C short-term — set by the PP substrate, not the membrane
Chemical resistancePTFE is effectively inert; the polypropylene substrate governs the practical limits
Ring optionsPolypropylene snap ring · stainless steel · galvanised steel
FitsEvery housing we supply — see the range

Exact membrane rating, substrate weight, ring material and food-contact compliance are confirmed per order against the manufacturer’s current datasheet.

Close view of filter bag felt media
What it is for

Where this media earns its place

A felt bag filters through its thickness, so the rating is nominal and fine solids work their way in. A membrane bag filters at the surface, so the cut point is sharp and repeatable, the cake lifts off instead of blinding the media, and nothing sheds into your clean side. It costs several times a plain felt bag and earns it back on life and on cut point — not on unit price.

Typical duties

Where a defined cut point has to be proven, where fibre shed is unacceptable — coatings, electronics, plating and pharmaceutical duty — and where the solid is worth recovering.

Why it lasts

Because solids sit on the surface rather than lodging in the felt, the cake releases and the bag can often be cleaned and returned to service — which is where the cost case comes from.

Temperature

90 °C continuous, 100 °C short-term. The membrane is not the limit — the PP substrate is. The housing seal has its own limit, and the lower of the two governs.

Other media

If this is not the right one

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PPMO

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Carbon

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Oil sorb

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HE / HiSEP

High efficiency

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Leachate

Landfill leachate

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Priced per box · volume rates

Bag price moves with media, micron, ring type and quantity, and drops sharply at volume. Tell us the spec and your annual usage for a per-bag rate and a standing-order price. Get bag pricing →

Build it and see the price

Pick the size, media, micron, ring, handles and pack — the configurator gives you a part code, a full specification and a price, with the volume breaks shown. Minimum order a pack of five.

Build & price a bag →

Tell us the duty, not the part number

Flow rate, fluid, temperature, particle size and how often you want to change bags. We size the housing and the bag around that and quote the pair, delivered and commissioned.

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