Coefficient of Friction (COF) Film Test Record
Record static and kinetic COF results for film samples, then tie them to machine runnability on filling and packing equipment. Use it to document setup, acceptance criteria, and any slip-related non-conformance in one place.
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Overview
This template records coefficient of friction testing for film samples and connects the lab result to how the film actually runs on packaging equipment. It is built for static and kinetic COF measurements, with fields for sample ID, lot number, film description, test method, instrument calibration, sled weight, speed, environmental conditions, specimen orientation, and surface pairing.
Use it when slip performance affects machine feeding, conveying, sealing, or downstream handling, especially for incoming lot verification, supplier qualification, change control, or line troubleshooting. The runnability section helps you document whether the film showed sticking, excessive drag, or jamming during use on filling and packing equipment.
Do not use this as a generic material inspection form when COF is not the controlling characteristic, or when your organization needs a different validated method than ASTM D1894 or an approved internal method. It is also not a substitute for full packaging validation, seal integrity testing, or a broader quality release record. If the film is printed, coated, or orientation-sensitive, the test setup must clearly state which surface was tested and in what direction, because those details can change the result. The template is most useful when you need a repeatable record that supports acceptance decisions, non-conformance handling, and traceability back to the exact lot and test conditions.
Standards & compliance context
- The structure supports ASTM D1894-style COF testing by prompting documentation of method, instrument, sled weight, speed, and specimen orientation.
- If your site uses an internal validated method, the template can be aligned to your quality management system under ISO 9001:2015 document control and non-conformance handling.
- For food-contact or food-packaging applications, the record can support supplier verification and quality checks that sit alongside FDA Food Code-related controls and customer specifications.
- If the film is used in regulated packaging operations, the runnability notes help document release decisions, deviations, and corrective action in a traceable way.
General regulatory context for orientation only — verify current requirements with counsel or the relevant agency before relying on this template for compliance.
What's inside this template
Inspection Details
This section establishes the identity of the sample and the acceptance basis before any test results are recorded.
- Test date and time recorded
- Sample ID / lot number documented
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Film material description documented
Include resin type, structure, gauge/thickness, finish, and any coating or treatment if applicable.
- Applicable specification or acceptance criteria referenced
- Test method identified as ASTM D1894 or approved internal method
Test Setup and Conditions
This section matters because COF results are only meaningful when the instrument, method, and environment are documented.
- Test instrument identified and calibrated
- Test sled weight recorded
- Test speed recorded
-
Environmental conditions recorded
Record temperature and relative humidity at the time of test.
-
Specimen orientation and surface pairing documented
Identify film-to-film, film-to-metal, or other surface pairing and note machine direction/cross direction if applicable.
COF Test Results
This section captures the measured static and kinetic values, replicate count, and average used for the acceptance decision.
- Static COF result recorded
- Kinetic COF result recorded
- Number of test replicates completed
- Average COF values calculated and recorded
- Results meet acceptance criteria
Machine Runability Assessment
This section links the lab result to actual performance on filling and packing equipment, where slip problems show up.
- Film slip performance acceptable for intended machine
- No evidence of sticking, excessive drag, or jamming observed
-
Observed runnability notes documented
Include any observed feeding behavior, web handling concerns, or machine-specific observations.
Documentation and Sign-Off
This section closes the record by documenting deficiencies, corrective action, and accountability for the final disposition.
-
Deficiencies or non-conformances documented
Record any out-of-spec results, unusual observations, or deviations from the approved method.
-
Corrective action or disposition documented
Include re-test, hold, use-as-is, or escalation details as applicable.
- Inspector signature captured
How to use this template
- Enter the inspection details first by recording the test date and time, sample ID or lot number, film description, acceptance criteria, and the method used.
- Document the test setup by identifying the instrument, confirming calibration status, recording sled weight and speed, and noting environmental conditions and specimen orientation.
- Run the required number of replicates, capture each static and kinetic COF result, and calculate the average values in the results section.
- Compare the averages to the stated acceptance criteria and mark whether the film meets the requirement before moving to the runnability assessment.
- Record observed machine behavior such as sticking, drag, or jamming, then describe any deficiencies, corrective action, or disposition in the sign-off section.
Best practices
- Record the exact film side tested, because printed, coated, and treated surfaces can produce different COF values.
- Verify instrument calibration before the test and note the calibration status on the record, not just in a separate log.
- Use the same sled weight, speed, and surface pairing called for by the approved method so results stay comparable across lots.
- Capture each replicate immediately and calculate the average on the same record to avoid transcription errors.
- Tie the COF result to observed machine behavior, since a passing number can still hide a runnability problem on a specific line.
- Photograph or attach evidence of visible defects, contamination, or surface damage when they may have influenced the reading.
- Flag any lot with borderline results for review rather than releasing it on a verbal judgment alone.
What this template typically catches
Issues teams running this template most often surface in practice:
Common use cases
Frequently asked questions
What does this COF film test record template cover?
It captures the full COF test record for film samples, including inspection details, test setup, static and kinetic COF results, and a runnability assessment. The template is built to document whether the film meets the specified acceptance criteria and whether it performs acceptably on filling or packing equipment. It also includes space for deficiencies, corrective action, and sign-off.
When should I use a COF film test record instead of a general quality inspection form?
Use this template when slip performance matters to machine feeding, sealing, conveying, or carton/packaging line runnability. It is especially useful for incoming film verification, supplier qualification, change control after resin or coating changes, and troubleshooting line jams or excessive drag. A general inspection form usually does not capture the test method, sled weight, surface pairing, or replicate averages needed for COF work.
Who should complete this template?
A quality technician, lab technician, or packaging engineer usually runs the test and records the results. If the film is being evaluated for production release, a supervisor or quality lead should review the acceptance decision and sign off. The person completing it should be trained on the selected test method, instrument use, and how to interpret the specification.
How often should COF testing be performed?
That depends on your control plan, supplier agreement, and risk level. Many teams test on incoming lots, after formulation or coating changes, during first article approval, and when machine runnability issues appear. If the film is critical to line performance, build the frequency into the quality plan rather than waiting for a complaint or jam.
Does this template align with ASTM D1894?
Yes, the structure is designed to support ASTM D1894 or an approved internal method for measuring static and kinetic COF. It prompts you to document the instrument, sled weight, speed, specimen orientation, and surface pairing so the test can be reproduced. If your site uses a different validated method, the template can be customized to match it.
What are the most common mistakes when using a COF test record?
Common mistakes include omitting the exact film lot, failing to record calibration status, and mixing up the test surface pairing or specimen orientation. Another frequent issue is reporting a single COF value without the replicate count and average, which makes the result hard to defend. Teams also sometimes record the numbers but skip the runnability note, even though machine behavior is often the reason for the test.
Can I customize this template for different film structures or packaging lines?
Yes. You can add fields for coated versus uncoated film, printed versus unprinted side, sealant layer, gauge, slip additive package, or line-specific acceptance limits. Many teams also add machine name, product family, or supplier code so the record can be searched by the exact application that matters.
How does this template help with corrective action and traceability?
It creates a clear link between the sample identity, the test conditions, the measured COF values, and the observed machine behavior. If a lot fails, the record gives you the evidence needed to open a non-conformance, hold product, notify the supplier, or retest under controlled conditions. That traceability is much stronger than an ad hoc note in an email or spreadsheet.
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