All wetted materials
Compare membrane, cage, end caps, support, housing and seal—not only the headline membrane polymer.
Replacement and supply continuity
Semiconductor filter second-source qualification.
A matching size or pore label does not establish equivalence. A controlled second-source review compares construction, retention method, hydraulics, hardware, cleanliness requirements and process acceptance before production use.
IdentifyFull part numberOr a clear product label photo
DefineChemical and SDSPlus the exact process position
MeasureOperating envelopeFlow, pressure drop and temperature
ApproveAcceptance criteriaWritten before sample testing
Qualification boundary
“Potential alternative” comes before “approved replacement.”
Part-number mapping can identify a candidate, but it cannot approve the process change. The candidate must fit the same chemical duty and hardware interface, and the buyer must define how retention, flow, cleanliness and process performance will be compared.
Zhongfu supports the technical screening of its engineered liquid filter families using the information available. Any final approval remains controlled by the customer’s qualification process.
We do not describe a filter as a drop-in equivalent solely from a catalogue description. Differences in test method, materials, membrane area, seal, adapter or cleaning state can change the result.
1 · INTAKECapture the complete incumbent identity, process duty and reason for qualification.
2 · GAPCompare every known field and mark missing evidence explicitly.
3 · SAMPLEAgree the configuration, baseline, test method, quantity and stop conditions.
4 · DECIDERecord approved conditions, limitations, open issues and requalification triggers.
Comparison framework
Six fields that must survive the handover.
The output should be a documented evidence gap and sample plan—not an unsupported “same as” statement.
Test method and challenge
Record whether the published value is nominal, absolute or method-specific, including challenge fluid and acceptance criterion.
Flow and differential pressure
Compare clean and loaded behaviour at the real fluid viscosity, temperature, normal flow and peak flow.
Cartridge and hardware fit
Confirm length, outside diameter, end adapter, seal dimensions, flow direction and available installation envelope.
Process-relevant criteria
Define the required extractables, ionic/metal contamination, TOC, rinse-down, integrity or other facility criteria where applicable.
Documents and change control
List the evidence your quality process requires. Availability of each requested document must be confirmed, not assumed.
Start when the business need and process boundary are clear
Common triggers include supply continuity, lifecycle risk, a new site, a new equipment set, a cost review or a process change. Record the trigger because it determines the acceptable timeline, testing depth and decision owner.
For an existing position, start with the incumbent’s complete part number, label, datasheet revision, housing and approved conditions. For a new position, use an application design-in process instead of forcing an incumbent-style cross-reference.
Candidate evidence table
| Field | Incumbent evidence | Candidate evidence |
|---|---|---|
| Product identity | Complete manufacturer and part number | Complete candidate family, configuration and revision |
| Application | Approved chemical, position and operating conditions | Explicit screening boundary and known limitations |
| Construction | Membrane, supports, hardware and seals | All equivalent fields; unexplained differences flagged |
| Retention | Published value and test method | Comparable method or a defined bridging test |
| Hydraulics | Baseline flow/ΔP and change-out criterion | Test curve under representative conditions |
| Interface | Controlled drawing, housing or verified dimensions | Fit check before chemical or tool testing |
| Acceptance | Current process/yield or quality criteria | Written pass, conditional-pass and fail thresholds |
Write the sample plan before shipping samples
- Identify the exact candidate configuration, quantity, lot relationship and labelling.
- Define the incumbent baseline and whether testing is parallel, sequential or position-limited.
- Agree incoming inspection, flushing, pre-wet, handling and installation procedures.
- Set test duration, data owner, measurement method and process stop conditions.
- Record pass, conditional-pass and fail criteria in writing.
- Define the controlled production-lot step and requalification triggers after a successful sample.
Open the complete semiconductor filter qualification checklist →
Minimum information for Zhongfu screening
Send the full incumbent part number or label photo, chemical/SDS, process position, flow, inlet pressure, allowable pressure drop, temperature, adapter and seal, current acceptance method, sample quantity, destination and the business reason for the review.
If the duty points to an all-fluoropolymer construction, review the PTFE and PFA semiconductor filter selection page. The complete Zhongfu range is listed on the 12-family product page.
Have a part number or label photo?
Send it with the process duty and acceptance target. We will identify the evidence gaps before samples.