Description
Polyflon · Product specification
CuFlon PTFE Circuit Boards
Identify CuFlon correctly and specify the copper-plated substrate.
CuFlon is a Polyflon microwave substrate described by Crane as pure PTFE with proprietary copper plating. It is not a Rogers laminate, despite the retained wording in this legacy URL.
Send preliminary files or a released drawing. Identify the material, quantity and open decisions.
Decision first. Request the genuine product designation, copper construction and a current supplier document. Do not transfer woven-glass PTFE drilling or dimensional assumptions directly to this unreinforced substrate.
01 / Material evidence
What to know about CuFlon PTFE Circuit Boards
| Review item | What to use |
|---|---|
| Material / subject | CuFlon PTFE Circuit Boards |
| Primary decision | Identify CuFlon correctly and specify the copper-plated substrate |
| Construction control | Exact grade, revision, dielectric thickness and foil |
| Design data | Use the approved supplier sheet and geometry model |
| Application task | Unreinforced PTFE microwave substrates |
| Useful next step | Send the drawing and material requirement |
Family and application descriptions are selection guidance. Availability, production limits, pricing and acceptance scope require a project review.
Reference: .
02 / Your engineering task
Thickness options and the model you actually use
A laminate family can offer more than one thickness and electrical data set. Choose the row that corresponds to the ordered construction. A catalog range is not a tolerance around one universal value, and its midpoint is not automatically an approved design input.
In a microstrip, the relevant height is the dielectric between the signal and reference plane. In a centered stripline it is useful to distinguish total plane spacing from the distance to either plane. A finished-board caliper measurement includes other layers and copper and cannot replace those dimensions.
Run sensitivity scenarios before the layout is frozen. Hold width fixed and vary the dielectric assumptions to see the direction of impedance movement. These corner calculations are not a statistical yield prediction. Agree the actual thickness tolerance, finished copper and coupon method with the fabricator, then record how the approved stackup maps to the circuit model.
| Continue when you need… | Next page |
|---|---|
| Choose among laminate constructions and material families | PTFE PCB Materials |
| Choose the right permittivity for a circuit model | PTFE Dielectric Constant |
| Select a PTFE construction and prepare a buildable RF board enquiry | Teflon PCB |
03 / Engineering calculations
RF design workbench: width, phase and loss
Work with CuFlon PTFE Circuit Boards using the exact construction data. Select a line model or a planar passive calculation. Results explain the assumptions and can be downloaded with the entered values.
PTFE RF Design Workbench
Read dielectric data in the right context
A material data table and a circuit simulation answer different questions. Process Dk is used in a defined material measurement. Design Dk is a supplier modeling reference. Effective permittivity belongs to the transmission-line geometry and includes how its fields occupy the surrounding media. Keep those labels attached when copying values into a drawing, a calculator or an RF model. An unlabeled number is difficult to audit later.
For a microstrip, identify the distance between the trace and its continuous reference plane. Do not enter total board thickness unless that dimension really is the dielectric height. For centered stripline, this workbench asks for total ground-plane spacing. An asymmetric stripline, a coplanar line with backside ground, solder mask over the trace or a mixed-dielectric stack requires a model that actually represents those features.
Use the calculation to establish scale and sensitivity. The workbench uses a zero-thickness, quasi-static line model, so it does not compensate for finished copper, etch shape, roughness, dispersion or transitions. A narrower nominal trace is not automatically a better layout. Check routability and tolerances, then correlate the chosen geometry with a field solver and an agreed fabrication coupon.
04 / Scope and budget
Cost planning and a usable quotation brief
Use this form when preparing a CuFlon PTFE Circuit Boards enquiry. You can also go straight to Contact without calculating. The budget is optional and uses your own board-specific cost allowances.
PTFE Fabrication & Budget Brief
Compare cost using the same construction and acceptance scope
The laminate price is only one part of a finished RF board quotation. Ordered sheet format, panel utilization, copper, layer count, holes, bonding, handling and inspection all affect the manufacturing plan. Small quantities can carry a larger share of setup and test-fixture effort. An apparent material saving may disappear if it requires a new layout, additional coupons or a repeat qualification build.
For a meaningful comparison, hold the board outline, quantity, acceptance criteria and deliverable constant. Ask which material grade, thickness, foil and bond system each proposal assumes. Separate bare-board fabrication from component purchasing and assembly. Also separate continuity testing from impedance or RF measurements so that a lower price is not simply a smaller test scope.
The quotation tool generates a project brief by default. Optional budget numbers use your entered allowances, not a 吃瓜tv tariff or current market price. Its scenario range is not a statistical confidence interval. Complex hybrids, metal-backed structures, unresolved grades and special qualification work go to engineering quotation. Freight, tax and any work not explicitly entered remain outside the calculation.
05 / Review the construction
Design-to-build review for CuFlon PTFE Circuit Boards
What to send for an engineering quotation
Send the circuit artwork in the agreed fabrication format, drill data, board outline, mechanical notes, quantity and revision. Add a stackup that names every core and bonding layer, dielectric thickness, copper requirement and surface finish. Identify open decisions clearly; a preliminary drawing can start a discussion, but it should not be mistaken for an approved production release.
For controlled impedance, list each target, tolerance, signal layer and reference layer. State whether the requirement is single-ended or differential and provide any intended coupon or test method. For a material-controlled build, include the exact manufacturer designation and the document revision used in design. Describe approved substitutions explicitly, or say that changes require written engineering approval.
If the order includes assembly, supply the BOM with manufacturer part numbers, placement data, assembly drawing and test expectations. Discuss connector attachment, thermal exposure and any fragile or thin RF regions before fabrication. The board material, bonding film and subsequent assembly profile must be reviewed as a system. Sending these details early makes quotations easier to compare and reduces ambiguous assumptions.
06 / Evidence and release
Prepare the next engineering review
Approve the first build and control the next revision
Agree the first-build acceptance plan before the order enters fabrication. Useful records can include material identity, stackup confirmation, dimensional checks, connectivity results, impedance measurements and application-specific RF evidence. The actual list depends on the project. Do not assume that a laminate datasheet, a supplier certificate or a photograph substitutes for finished-board inspection.
When a coupon result differs from the model, compare the same reference structure and test method before changing the material value. Check finished geometry, dielectric height, foil assumptions, fixture influence and calibration. Record any agreed compensation with the drawing revision so that a repeat order does not inadvertently revert to the original nominal dimensions.
Keep an approved build record containing material designation, laminate revision, stackup, circuit revision, permitted substitutions and test limits. Review changes to foil, bond material, panel orientation, assembly exposure or supplier route before treating the next lot as identical. A successful prototype demonstrates that particular build under its test conditions; it does not eliminate the need for controlled production changes.
07 / Practical answers
Questions engineers ask before releasing CuFlon PTFE Circuit Boards
What is the most important decision for CuFlon PTFE Circuit Boards?
CuFlon is a Polyflon microwave substrate described by Crane as pure PTFE with proprietary copper plating. It is not a Rogers laminate, despite the retained wording in this legacy URL. Request the genuine product designation, copper construction and a current supplier document. Do not transfer woven-glass PTFE drilling or dimensional assumptions directly to this unreinforced substrate.
Which Dk should I enter in the calculator?
Use the approved design/model Dk for the exact construction. Process Dk is a supplier material-test value; effective permittivity is geometry-dependent. Where this page has no verified single design value, the field remains blank. An example calculation does not establish a product specification.
Does this page confirm current stock or a guaranteed build limit?
No. Material documentation describes a product; it does not confirm current 吃瓜tv inventory, procurement lead time or the manufacturability of every geometry. Send the grade, drawing, quantity and required acceptance conditions for a project-specific review.
How should I compare a proposed material substitution?
Request the genuine product designation, copper construction and a current supplier document. Do not transfer woven-glass PTFE drilling or dimensional assumptions directly to this unreinforced substrate. Compare the exact core, bond system, thickness, foil, electrical model, thermal conditions and first-build evidence. Preserve the approved drawing until the proposed change is accepted.
Does the loss calculator predict measured insertion loss?
It estimates the dielectric contribution of a simplified microstrip with an entered constant loss tangent. Conductor, roughness, radiation, mismatch, connectors and test fixtures are excluded. Use a complete circuit model and an agreed RF measurement when total insertion loss is an acceptance requirement.
Can I ask for a quote before every parameter is finalized?
Yes. Send the available files, quantity and intended use, and identify which decisions remain open. State whether you want bare boards or assembly. A preliminary enquiry can establish the next engineering questions without being treated as a released production order.
Original material references
Technical sources identify the material and explain supplier methods. They do not certify a finished 吃瓜tv board or confirm stock. Check the current exact-grade revision for a production order.
Send the material requirement with the board files.
Request the genuine product designation, copper construction and a current supplier document. Do not transfer woven-glass PTFE drilling or dimensional assumptions directly to this unreinforced substrate.
For a broader fabrication project, see PCB Manufacturing services.
