WECOME / Membrane materials

Low-Pressure RO Membrane Sheets for Element Manufacturers

Compare LP and ULP grades, define your roll requirements and request samples for your next production trial.

  • Polyamide TFC sheet in roll form
  • Grade review against your rejection and output targets
  • Roll, slitting and sample supply by quotation
Request Samples & a QuoteCompare Grades

Membrane raw material for element production. Product visuals are illustrations, not factory photographs.

Illustrative RO membrane rolls and unwound flat sheet for element production
LP & ULP gradesCompare on a common test basis
Roll requirementsDefine width and cut layout
Sample reviewValidate in your construction
Supply quotationAgree grade, quantity and delivery

A focused procurement shortlist

Compare Low-Pressure and Ultra-Low-Pressure Sheet

Start with the conditions your element must meet. These three listed grades offer a starting point for a sample discussion, not an automatic substitute for your approved sheet.

LP / REJECTION-LED

TPK-LP-H

Start with the rejection target. Shortlist when your acceptance brief puts a tighter limit on salt passage. Confirm that the resulting element also meets your required output.

Discuss TPK-LP-H
LP / BASELINE COMPARISON

TPK-LP

Compare with your current sheet. A candidate for a controlled, like-for-like production trial. Keep feed conditions, membrane area and element construction consistent when comparing.

Discuss TPK-LP
ULP / PRESSURE REVIEW

TPK-ULP

Review the pressure requirement. Discuss this ULP candidate with your feed-water analysis and intended pressure. The grade name is not a guaranteed operating-pressure rating.

Discuss TPK-ULP
Published Grade Reference
GradeSalt rejectionWater flux, GFDBefore approval
TPK-LP-H99.5%32–36Confirm grade-specific test data and sample results
TPK-LP99.4%35–39Confirm grade-specific test data and sample results
TPK-ULP99.2%39–42Confirm grade-specific test data and sample results
Read the conditions with the numbers. The current product reference lists 150 psi, 25°C and pH 7–8. It does not specify feed-salt concentration, recovery or test method for each grade. Request the current test sheet before treating these figures as a directly comparable performance guarantee.

For the wider range, including XLP options, see the RO membrane sheet product specifications.

Conceptual exploded TFC membrane structure: separation film, porous support and nonwoven backing
Generic TFC structure. Colors, layer spacing and thicknesses are illustrative, not a TPK cross-section specification.

Inside the membrane sheet

Three Layers. Different Jobs.

A TFC membrane combines a thin separation layer with supporting layers. Understanding this RO membrane material helps separate sheet specifications from the components added during element assembly.

1

Polyamide separation layer

The selective surface controls water and salt transport. Protect it from damage during handling and conversion.

2

Porous support layer

Supports the thin selective film. The material and structure must be verified against the supplied grade.

3

Nonwoven backing

Provides mechanical support for handling and conversion. It is part of the membrane sheet, not the separate permeate carrier.

Match the grade to the duty

Define the Result You Need

A low-pressure label alone is not enough to select a sheet. Put the following requirements into the same acceptance brief before you compare samples.

Feed-water conditions

Share salinity or TDS, temperature, pH and relevant contaminants. A general label such as tap water does not replace a water analysis.

Available pressure

State intended operating and test pressure. Ask for the grade's operating limits; do not assume a pressure or energy-saving percentage from its name.

Rejection and output

Define the required permeate quality and element output together. A higher flux is useful only when rejection and construction requirements are also met.

Element construction

Provide the format, membrane area, leaf layout and spacer/carrier specifications. Finished-element performance must be checked in that construction.

Discuss My Application

From master roll to your leaf

Confirm the Usable Width Before Ordering

The overall roll width is not the same as usable membrane width. Match the grade and cut plan to your leaf design before calculating material use or placing a slit-roll order.

Published overall width
1,070 mm
Published effective width
1,036 mm
  • Confirm the cutting direction and active surface orientation.
  • Specify slit width or cut length, quantity and tolerances.
  • Check edge allowance and sample layout before approving the order.

Dimensions are from the current product reference. Confirm the actual supplied grade and agreed cut specification.

Plan view showing 1070 mm overall roll width and 1036 mm effective width with a sample leaf layout
Planning illustration only. The hatched margins are not an approved edge-trim tolerance.
Illustrative roll and unwound membrane sheet
Roll format: confirm the required width and length in your order.
Illustrative close-up of membrane roll edges
Edge and surface condition: inspect against an agreed sample specification.
Illustrative spiral-wound membrane element cutaway showing sheet, permeate carrier and feed spacer
Assembly concept, not a production drawing. The feed spacer and permeate carrier are separate materials.

Keep the material stack consistent

From Flat Sheet to Spiral-Wound Elements

Membrane sheet is one input to spiral wound membranes. The neighbouring flow-channel materials and leaf construction also affect how the finished element performs.

  • Membrane sheet provides the selective barrier.
  • Feed spacer forms the feed-side flow channel.
  • Permeate carrier provides the permeate-side path toward the central tube.

When changing the sheet grade, keep the remaining material stack controlled during the first comparison. Record any process adjustments rather than attributing every result to the sheet alone.

Feed spacer specificationsPermeate carrier specifications

Before you commit to bulk supply

Turn a Sample into an Approved Specification

Agree the sample, test method and acceptance criteria first. Use the same evidence to define a repeat order.

01

Review the data

Request the grade-specific data sheet, test conditions and available batch records. Compare these with your current approved material.

02

Inspect the sample

Check supplied dimensions, visible surface and edge condition, packaging and handling instructions against the agreed requirements.

03

Run a production trial

Use your actual leaf design, materials and manufacturing process. Record conversion behaviour and test the finished sample element.

04

Agree the supply order

Confirm grade, dimensions, quantity, packaging, documents, storage requirements and delivery terms. Keep the accepted reference for repeat orders.

For the wider vendor review, use the membrane sheet supplier evaluation checklist. Sample availability and acceptance support are agreed in the quotation.

Prepare a useful quotation

Request LP / ULP Sheet Samples and Supply

Send the requirements behind the grade name. WECOME can review the candidate sheet, requested format and sample or bulk-supply scope with your team.

  • Feed-water analysis and intended test conditions
  • Target rejection and finished-element output
  • Current grade or test report, when available
  • Roll/slit dimensions, quantity and destination

A quotation should separate the sample requirement from the production order. Confirm price, minimum order, lead time and delivery terms before approval.

Your Sheet Requirement

Request Samples & a Quote

Technical references

Keep Your Next Decision Connected

Complete Sheet Range

Review the general membrane sheet range and published product dimensions.

View product specifications

Supplier Evaluation

Check the evidence behind a quotation, not just the headline price.

Review the supplier checklist

Permeate-Side Material

Confirm the carrier specification alongside the sheet and your leaf construction.

Review permeate carrier

Materials and equipment, reviewed together

Connect Your Sheet Supply to Element Production

Buying membrane sheet for an existing factory or a new line? Match your material trial to the equipment that will handle the leaf stack and finished element.

WECOME household RO membrane rolling machine with adhesive supply equipment

Residential production

Household Element Production

Review the leaf stack, central tube and finished diameter with the machine configuration before approving a new sheet grade.

View household rolling machine
WECOME industrial semi-automatic RO membrane rolling machine

Industrial production

4040 / 8040 Element Production

Check leaf dimensions, material handling and rolling requirements for your industrial program. Validate the sheet in the agreed element construction.

View industrial rolling machine

Planning the Complete Production Line?

Coordinate sheet supply with rolling, finishing and testing. Agree station scope, target output, utilities and acceptance tests in the project quotation.

Review the turnkey line solution
  1. Sheet & leaf preparation
  2. Rolling
  3. Curing & finishing
  4. Element testing

A compatible format alone does not approve a sheet-and-machine combination. Include your material sample and leaf design in the trial.

Discuss Materials & Equipment

Before your enquiry

Low-Pressure Membrane Sheet FAQs

Can you supply low-pressure RO membrane sheet rather than finished elements?
Yes. WECOME lists LP and ULP membrane sheet grades supplied as roll material for element manufacturing. Discuss full rolls, slitting or cut-to-size requirements and sample availability in your quotation. This page is for membrane sheet procurement, not replacement RO cartridges.
What is the difference between LP and ULP membrane sheet?
LP and ULP identify grade families, but they are not a universal pressure specification. Compare the supplier's grade-specific test conditions, rejection, flux and operating limits. Validate the shortlisted sheet at the pressure and feed-water conditions your finished element will actually use.
Does the highest listed flux mean the best grade for our production?
Not necessarily. The sheet must also meet the rejection target and work with your membrane area, spacers, adhesives and element construction. GFD is a flux per unit area at test conditions; it is not a finished 4040 or 8040 element output guarantee.
Can we replace an existing grade with TPK-ULP without changing the process?
Do not assume a direct substitution. Review the existing data sheet, test a sample with your current material stack and record any changes needed in cutting, leaf preparation, rolling and performance testing. Agree acceptance criteria before approving bulk supply.
Can low-pressure sheet be selected for seawater simply from this table?
No. The table does not establish seawater suitability. Send the feed-water analysis and pressure requirements and request grade-specific validation. Neither the LP/ULP name nor a general application description is sufficient to approve a seawater duty.
What should a sample and bulk-supply quotation include?
Specify the candidate grade, sample size or quantity, required roll or slit dimensions, bulk quantity and destination. Ask to confirm current specifications, test conditions, available batch documents, packaging, storage instructions, minimum order and lead time. Prices and delivery commitments must be confirmed in the quotation.

Find the Sheet That Fits Your Production

Share your target conditions, element construction and required quantity for a focused grade and supply review.

Discuss My Sheet Requirement
Grade and dimension references: WECOME membrane sheet specifications. Structural and assembly visuals are conceptual illustrations, not microscopy, product certifications or factory photographs. Confirm current grade data and the sample specification before ordering.

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