A reliable foil purchase starts with a controlled order basis—not with an ambiguous phrase such as “0.005 foil,” “medical foil” or “ultra-clean titanium.” The buyer and supplier need the same material, dimensional, surface, coil, evidence and delivery definition.
1. Start with the Downstream Process and Supply Scope
Record what happens after delivery: forming, stamping, etching, bonding, coating, winding, electrical assembly or another qualified process. State equipment interface, material orientation, temperature, media, loads, cleanliness, inspection and component qualification where relevant.
Component geometry, deformation, feeding, bonding/coating, electrical duty, environment and acceptance authority.
Master coil, slit strip, cut sheet or blank; annealing, cleaning, slitting, inspection, documents and packing.
2. Foil, Strip, Sheet and Plate
These words do not share one universal thickness cutoff across every commercial convention and specification. Avoid arguing from the label alone. State the governing specification, nominal thickness with unit, width, length or coil data, condition and delivery form.
| Order description | Typical delivery focus | Required clarification |
|---|---|---|
| Foil coil | Very thin continuous rolled material | Thickness/width, condition, surface, ID/OD/weight, winding |
| Slit strip | Controlled-width continuous coil | Width tolerance, edge/burr, camber, coil set and package |
| Cut foil sheet / blank | Flat piece converted from coil or strip | Dimensions, flatness, edge, surface protection and quantity |
| Sheet / plate | Flat product controlled by the ordered specification | Confirm whether the requirement belongs on the plate/sheet route |
3. Standard, Grade and Condition
ASTM B265 covers annealed titanium and titanium-alloy strip, sheet and plate within its scope. It should not be applied automatically to every thin-gauge, hard, half-hard or customer-defined foil product. State the revision and verify that grade, condition and dimensions fit the ordered basis.
Use `grade + UNS when needed + specification/revision + condition + dimensions + supplementary requirements`. For non-standard condition or performance, add a customer-approved specification and acceptance plan.
4. Thickness, Units and Width
Always state thickness with its unit. A value of 0.005 could mean millimetres or inches, producing very different material. Include nominal thickness, thickness tolerance, width, width tolerance, length or coil configuration and quantity.
Common engineering order unit; write the leading zero.
1 mm = 1,000 μm. Use for clarity with very thin material.
State decimal inches explicitly and do not omit the unit.
Capability should be treated as a thickness × width × grade × condition relationship. A minimum thickness claim without its achievable width, tolerance, length and evidence is incomplete.
5. Tolerance, Flatness and Measurement Plan
Thickness tolerance, width tolerance, flatness, camber, waviness, coil set and edge shape are separate controls. The inspection plan should define instrument, measurement force where relevant, locations, edge exclusion, sample frequency, rounding and report format.
| Control | What to define | Why it matters |
|---|---|---|
| Thickness mapping | Method, points across width/length, sampling and tolerance | Shows local and lot variation |
| Width and edge | Width method, burr, edge damage and slit consistency | Affects feeding, forming and handling |
| Flatness/camber | Datum, length basis, method and maximum deviation | Cannot be inferred from thickness values |
| Coil shape | Telescoping, dish, coil set and winding acceptance | Affects payoff and line stability |
6. Surface, Cleanliness and Pinhole Requirements
Bright, matte and degreased are descriptive starting points, not complete acceptance criteria. Define surface roughness where required, visible-defect limits, cleaning method, permitted residue, oil/handling restrictions, pinhole inspection method, sample area, lighting or instrument and acceptance threshold.
- Do not promise pinhole-free material without a method, inspected area and limit.
- Keep cosmetic surface requirements separate from functional bonding or coating requirements.
- Define protective films, interleaving and packaging compatibility with the downstream process.
- Agree what happens if the coil is opened, respun, cut or re-cleaned.
7. Coil, Slitting and Edge Control
For a coil or slit-strip order, specify coil ID, maximum OD, net weight, winding direction, material orientation, core, tie-down, splice policy, telescoping limit and protective package. For slitting, add width tolerance, burr, edge condition, camber and any edge-trim requirement.
Separate the master-coil source, conversion scope and final lot identity. Confirm whether heat treatment or cleaning occurs before or after slitting and how traceability is transferred to each child coil.
8. Application Qualification Boundaries
Define surface, cleanliness, roughness, chemistry restrictions, dimensional stability and process trials rather than assuming adhesion from material grade.
Customer specifications, approved source, condition, properties, traceability and qualification remain order-specific.
Raw foil does not establish cell performance, current-collector suitability, coating compatibility or service life.
Material conformity does not establish finished-device approval, biological evaluation, sterilization validation or clinical suitability.
9. Process Route and Order Evidence
The order-specific route may include source coil review, rolling, intermediate/final annealing, cleaning, slitting, cutting and packaging. Require disclosure of the actual route and processing responsibility instead of relying on a generic factory statement.
| Control question | Evidence when applicable | Acceptance decision |
|---|---|---|
| Is the material the ordered grade/condition? | MTC, heat/lot identity, condition and route statement | Certificate, order and labels agree |
| Can the route meet thickness/width? | Capability review, process plan and sample dimensional report | Required combination and tolerance are feasible |
| Will surface and edge meet the process? | Agreed inspection method, report template and protected sample | Criteria are measurable and linked to the lot |
| Will the coil arrive usable? | Coil drawing/data, winding and packing proposal | Equipment interface and damage prevention are covered |
10. Cost and Quotation Comparison
Price is influenced by alloy and condition, source coil, finished thickness, width and tolerance, rolling and annealing route, yield loss, surface/cleaning, slitting, inspection, coil size, quantity, packing and logistics. Thin material can cost more per kilogram because additional process control and yield loss may outweigh the reduction in mass.
- Normalize grade, condition, thickness/width and tolerances.
- Compare the same coil, slit-strip or cut-sheet scope.
- Separate material, conversion, special tests, packing, freight and taxes where useful.
- Record MOQ basis, quotation validity, schedule stages, exceptions and exclusions.
11. Complete Titanium Foil Purchase Guard
11.1 Product and material identity
- State foil coil, slit strip, cut sheet or drawing-based blank.
- Name grade, UNS where needed, specification and revision.
- State annealed, as-rolled, cold-worked or other approved condition.
- Prohibit unapproved material, condition, source or route changes where qualification depends on them.
11.2 Thickness, units and tolerance
- Write the nominal value and unit explicitly.
- Define thickness tolerance, local variation, edge exclusion and rounding.
- Agree instrument, measurement force, positions and sample frequency.
- Require a report format that matches the purchase acceptance decision.
11.3 Width, length and shape
- State width/length and tolerances for strip or cut pieces.
- Define flatness, camber, waviness and coil set separately where applicable.
- Identify rolling or material orientation if it affects processing.
- Use a drawing for profiles, datums and critical dimensions.
11.4 Surface and cleanliness
- Define finish, roughness when needed, visual-defect limits and cleaning method.
- Specify permitted residues, oils, markers, contact materials and handling.
- Define pinhole method, inspected area, sampling and acceptance only when required.
- Agree protective film/interleaving and removal compatibility.
11.5 Edge and slitting
- State slit, sheared, trimmed or drawing-specific edge.
- Define burr direction/height, edge damage, width consistency and camber.
- Confirm whether edge trim changes final width or yield basis.
- Protect slit edges from impact during handling and shipping.
11.6 Coil configuration and payoff
- Provide core/ID, maximum OD, net weight and allowable coil width.
- State winding direction, orientation, splice policy and telescoping limit.
- Define tie-down, core material, lifting and equipment interface.
- Agree child-coil identity and quantity tolerance after slitting.
11.7 Inspection, documents and traceability
- Create an order-specific inspection and document index.
- For every check, state method, sampling, acceptance and report requirement.
- Link heat/lot through rolling, slitting/cutting, label, MTC and packing list.
- Reject unrelated certificates as proof for the ordered coil or lot.
11.8 Availability, MOQ and schedule
- Ask whether source material is physical stock, incoming, mill-order or planned for conversion.
- Confirm whether MOQ is driven by source coil, rolling/annealing setup, slitting or shipping lot.
- Break lead time into material, conversion, inspection, documents, packing and transit.
- Record events that reset price or schedule.
11.9 Commercial comparability and change control
- Normalize quantity by kilogram, coil, meter, sheet or lot.
- Align currency, Incoterm, named place, payment, validity and delivery split.
- List technical exceptions and exclusions beside the quoted scope.
- Require written approval for deviations, substitutions and route changes.
11.10 Packing, handling and storage
- Prevent creasing, telescoping, pressure marks, edge damage and contamination.
- Define cores, wraps, interleaving, cartons/crates, moisture control and lifting.
- Align inner identity, outer label, packing list and certificate.
- State receiving, opening, storage and return-to-storage instructions.
Red flags before purchase order
The quotation says 0.005 or 5 without stating mm, inches or micrometres.
Minimum gauge is stated without width, grade, condition, tolerance and inspection evidence.
No method, inspected area, sampling or acceptance limit is stated.
ID, OD, weight, winding, orientation, splice, edge and packing are missing.
Decision gate
Do not release the order until material, dimensions, condition, surface, edge, coil/cut configuration, evidence, exceptions, packing and delivery terms tell the same story.
12. RFQ and Pre-Order Checklist
Grade, UNS, specification/revision, condition and required properties.
Thickness and unit, tolerance, width/length, flatness and camber.
Finish, cleanliness, roughness/pinhole criteria, burr and protection.
Coil/slit/cut, ID/OD/weight, winding, orientation and splice policy.
MTC, traceability, dimensions, surface/edge tests, witness and reports.
Quantity basis, MOQ, validity, packing, destination, Incoterm and required date.
13. Titanium Foil Purchasing FAQ
Is foil defined by a universal maximum thickness?
No. Terminology varies by specification, supplier convention and end use. The purchase order should control the product through its governing specification, dimensions, delivery form and acceptance requirements.
Can ASTM B265 be applied to cold-worked or hard foil automatically?
Do not assume so. Confirm the standard scope, ordered grade, permitted condition, dimensions and any customer requirements before claiming compliance.
How should thickness tolerance be verified?
Agree instrument type, contact or non-contact method, measurement force where relevant, locations, edge exclusion, sample frequency, rounding and report format.
What is the difference between thickness variation and flatness?
Thickness variation describes gauge values; flatness describes the material shape. Camber, coil set, waviness and edge condition are separate controls.
Does raw titanium foil qualify a battery, aerospace or medical component?
No. Material conformity is only one input. The component or process owner must complete application-specific qualification, design, safety and regulatory approval.
How should two titanium foil quotations be compared?
Normalize grade, specification revision, condition, thickness/width and tolerances, surface, edge, coil data, tests, documents, quantity basis, packing, Incoterm, schedule assumptions and exclusions.