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Coefficient of Friction Tester
STF-A /C
Focusing on packaging and material testing technology, we are committed to quality control in industries such as healthcare, pharmaceuticals, food, packaging, textiles, and new materials. Our products are widely used in enterprises, testing institutions, universities, and research institutes.
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- Commodity name: Coefficient of Friction Tester
STF-A /C
Coefficient of Friction (COF) Tester for Films, Papers & Sheets
Functions
Measure the static coefficient of friction (COF‑Static) — the force required to initiate motion between two surfaces.Measure the kinetic coefficient of friction (COF‑Kinetic) — the force required to maintain steady sliding.Evaluate the slip properties and smoothness of plastic films, packaging sheets, paper, and nonwoven materials.Essential for optimizing converting speed, packaging line efficiency, and consumer opening experience.Working Principle
A test specimen is fixed on the flat test bed. A calibrated sled (standard 200 g) with a known contact surface is placed on top of the specimen. The test bed moves horizontally at a constant speed (1–500 mm/min), pulling the sled via a precision force sensor. The system records the maximum force at the moment motion begins (static COF) and the average force during steady sliding (kinetic COF). Both values are automatically calculated and displayed.Compliant Standards
GB/T 10006‑2023 — Plastics — Film and sheeting — Determination of the coefficients of frictionISO 8295:1995 — Plastics — Film and sheeting — Determination of coefficients of frictionASTM D1894‑14(2020) — Standard Test Method for Static and Kinetic Coefficients of Friction of Plastic Film and SheetingTAPPI T816 om‑22 — Coefficient of Static and Kinetic Friction of Corrugated and Solid FiberboardGB/T 17200 — Rubber and plastics — General requirements for tensile testing machinesKey Features
Simultaneous Static & Kinetic COF: One automated test run delivers both the maximum starting force and the steady‑state sliding force, saving time and ensuring data correlation.High‑Speed Sampling: Up to 60 readings per second (Model STF‑C) captures the exact millisecond of static friction peak, preventing underestimation.Ultra‑High Precision: 0.001 N resolution and 0.5 % accuracy class (Model STF‑C) detect minute slip variations critical for high‑speed packaging lines.Precision Ball Screw Drive: Delivers vibration‑free, whisper‑quiet motion for stable low‑speed testing (as low as 1 mm/min).Fully Digital Control: No mechanical knobs; all zero adjustments and calibrations are performed digitally via the embedded microprocessor.Group Testing & Statistics: Run multiple specimens and automatically calculate Max, Min, Average, and Standard Deviation.Dual Model Options: Choose the standalone STF‑A for basic QC, or the STF‑C with professional PC software for advanced R&D and curve analysis.Technical Specifications
Models Available: STF‑A (Standalone) and STF‑C (Computer‑Controlled)Common Specifications (Both Models):Test Mode: Flat material to flat material frictionForce Range: 0 – 5 N (optional: 10 N, 20 N, 30 N)Force Resolution: 0.001 NMaximum Stroke: 150 mmStandard Sled Weight: 200 gTest Speed Range: 1 – 500 mm/min (stepless)Overall Dimensions: 520 × 330 × 230 mm (L×B×H)Net Weight: 20 kgPower Supply: AC 220/110V, 50/60 Hz, 200 WModel‑Specific Differences:STF‑A (Economy Model):Accuracy Class: 1 %Sampling Rate: 20 times/secondPC Software: Not includedPrinter: Built‑in micro printerSTF‑C (Advanced Model):Accuracy Class: 0.5 %Sampling Rate: 60 times/secondPC Software: Included (professional software with database and curve analysis)Printer: Built‑in micro printerStandard Configuration
Main testing machine (host unit)Standard 200 g sled with felt‑backed contact surfaceMicro thermal printerProfessional PC software (STF‑C model only)Operating manual and calibration certificateApplication Industries & Scenarios
Flexible Packaging & Converting
BOPP / BOPET Films: Measure COF to optimize slip agent (erucamide, oleamide) concentration and prevent blocking.Laminated Pouches: Ensure consistent heat‑seal jaw release and smooth filling line operation.Shrink Sleeves & Labels: Verify low COF for high‑speed automatic applicators.Paper & Printing
Corrugated Box Liners: Test linerboard friction to prevent jamming on folder‑gluers.Magazine & Catalog Paper: Evaluate pile friction for perfect binding and trimming.Release Liners: Measure release force and interfacial friction of silicone coatings.Pharmaceutical & Medical Packaging
Blister Foil: Test friction between aluminum lidding and forming film to ensure smooth blister forming.Form‑Fill‑Seal Films: Validate COF for uninterrupted vertical and horizontal ffs machinery.Surgical Drapes & Gowns: Assess nonwoven friction for comfortable draping and folding.Food & Beverage Packaging
Snack Bag Films: Optimize COF for high‑speed VFFS (vertical form‑fill‑seal) equipment.Ice Cream Wrapper: Ensure easy unwinding from rolls without sticking.Bottle Labels: Verify label slide during high‑speed roll‑through applicators.Tissue & Hygiene Products
Toilet Paper & Towel: Measure ply‑to‑ply friction affecting softness perception.Feminine Hygiene Wrappers: Test low COF for easy opening and disposal.Research & Third‑Party Testing
CNAS/CMA‑Compliant Testing: Issue legally defensible COF reports referencing GB/T 10006‑2023 or ASTM D1894.New Material Development: Compare friction performance of bio‑based vs. petroleum‑based films.Academic Research: Support tribology studies on polymer surface modification.Frequently Asked Questions (FAQ)
Q1: Why is high‑speed sampling (60 Hz) important for COF testing?A: Static friction is a transient event — the peak force occurs in milliseconds when the sled just begins to move. Low‑speed sampling (e.g., 10 Hz) can miss this peak, resulting in an artificially low static COF value. 60 Hz sampling ensures the true maximum is captured every time.Q2: What is the difference between static and kinetic COF?A: Static COF is the force needed to START motion between two surfaces at rest. Kinetic COF is the force needed to MAINTAIN steady sliding. In packaging, static COF affects initial unwinding and indexing, while kinetic COF affects continuous running speed and tension control.Q3: Is GB 10006‑88 still valid? Which version should I use?A: GB 10006‑88 is obsolete. You must use GB/T 10006‑2023 for all new test reports, especially those intended for CNAS/CMA certification or customer audits. Using the old standard may result in report rejection.Q4: Can I test materials other than plastic film?A: Yes. The instrument is suitable for any flat sheet material including paper, paperboard, nonwovens, rubber, and coated metals. Simply select the appropriate sled weight and test speed per the relevant standard.Q5: What sled weight should I use?A: The standard 200 g sled is specified in GB/T 10006 and ASTM D1894 for most plastic films. Heavier sleds (500 g, 1000 g) are available optionally for thicker or more rigid materials. Always follow the test method prescribed by your customer or regulatory body.Q6: Do I need the STF‑C or is the STF‑A sufficient?A: For routine QC where a simple pass/fail result is needed, the STF‑A with built‑in printer is cost‑effective. For R&D, method development, or when detailed force‑curve analysis is required, the STF‑C with PC software is strongly recommended.Q7: How do I prepare specimens correctly?A: Cut specimens to the dimensions specified in the relevant standard (typically 250 mm × 125 mm for film). Condition them in the standard laboratory atmosphere (23 °C, 50 % RH) for at least 4 hours before testing. Handle specimens only with gloves to avoid transferring skin oils that alter friction results. -
Function:
Test the dynamic and static friction coefficients of the plane material surface.
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Standards:
GB 10006、GB/T 17200、ISO 8295、ASTM D1894、TAPPI T816。
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Charateristics:
- High precision, error less than 0.001N.
- The dynamic and static friction coefficients are tested simultaneously.
- High speed sampling, up to 60 times / s.
- No mechanical knob, digital correction and zero adjustment.
- Embedded intelligent control, fully automatic test proces.
- Precision ball screw drive, stable operation, quiet.
- Group test data, embedded data statistical analysis function.
- High precision, error less than 0.001N.
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Specification:
Name
STF-A
STF-C
Mode
Flat material friction
Force Range
5 N（Optional: 10N, 20N,30N）
Accuracy class
1%
0.5%
Force resolution
0.001 N
Maximum stroke
150 mm
Slide ass
200 g
Test speed
1-500 mm/min
1-500 mm/min
Sampling rate
20 times/s
60 times/s
Computer software
No
Yes
Size
520×330×230mm （L×B×H）
Net weight
20 Kg
Power
AC220/110V 50/60Hz 200W
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Configuration：principle Machine,micro printer, proffesional software (Model C), 200g slider.
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