ISO 8295 Coefficient of Friction Testing Plastic Film Sheeting

Information on the most widely used ASTM standards within the materials testing industry

Descriptions of the most prominent lSO standards within the materials testing industry

Standards including EN, DIN, JlS, and more

Mechanical testing of polymer materials in the automotive industry is directly related to the safety of components and the reliability of the entire vehicle. UnitedTest can cover mechanical performance testing for automotive interior and exterior parts, as well as functional components, adapting to automaker standards and providing comprehensive testing solutions including tensile, impact, and fatigue tests.

Mechanical testing in the battery industry determines the tensile and puncture resistance of core components such as separators and electrodes, directly affecting battery safety and cycle life. UnitedTest can cover full-dimensional mechanical testing of battery materials, compatible with national and international standards, and provide customized testing solutions.

Mechanical testing in the consumer goods industry determines product durability and safety, such as impact resistance for toys and fatigue resistance for home appliances, making it core to compliance and quality. UnitedTest can cover mechanical tests for all categories of consumer goods, including tensile, impact, and hardness tests, compatible with national and international standards, and offers customized testing solutions.

In the field of medical and biomedical sciences, mechanical testing determines the safety and compatibility of implanted devices and biomaterials, making it a core part of regulatory approval. UnitedTest can cover a full range of tests including tensile, fatigue, and wear tests, compatible with national and international standards, and provides customized biomechanical testing solutions.

Material strength is a course that most engineering fields are required to study in university education. This interesting course is very practical and makes use of testing equipment in the materials laboratory.

Mechanical testing of industrial products and components is essential to ensure their load-bearing, fatigue resistance, and impact resistance, directly preventing production accidents and ensuring stable operation of equipment. UnitedTest can cover a full range of tests including tensile, hardness, and fatigue, complying with national and international standards, and provides customized industrial mechanical testing solutions.

Mechanical testing in the plastic pipe industry determines ring stiffness, impact resistance, and tensile performance, directly preventing pipe bursts and deformation risks. UnitedTest can cover full-dimensional mechanical testing of pipes, complies with ISO,ASTM,EN et.c, international standards, and provides customized testing solutions.

In the construction engineering and building materials industry, mechanical testing determines the compressive and tensile properties of materials such as concrete and steel, which is core to ensuring the safety and durability of buildings. UnitedTest can cover the full range of building material mechanical tests, complies with ISO, ASTM international standards, and provides customized testing solutions for compressive, tensile, and other properties.

Mechanical testing in the food and beverage industry involves the compressive and tensile performance of packaging and the safety of food texture, directly ensuring storage, transportation safety, and the eating experience. UnitedTest can cover all-dimensional mechanical testing for packaging and food texture, comply with national and international standards, and provide customized testing solutions.

Mechanical testing in the packaging industry determines the packaging's resistance to compression, impact, and tension, directly ensuring the safety of contents during storage and transportation. UnitedTest can cover comprehensive mechanical testing for packaging, complying with ISO, ASTM Standards, and provides customized testing solutions for compression, drop, tear, and more.

Mechanical testing in the transportation industry concerns the load-bearing and fatigue resistance performance of core components such as vehicles, tracks, and containers, directly ensuring transport safety and equipment durability. UnitedTest can cover mechanical testing for all types of transportation materials, complying with national and international standards, and provides customized testing solutions including tensile, fatigue, and impact tests.

Metallurgical testing examines the properties of metallic materials to determine if a particular metal is appropriate for its intended use.

Testing of polymer materials covers mechanical, thermal, and chemical properties, verifying strength, heat resistance, composition, and ensuring product quality and compliance.

UnitedTest offer world-class testing solution in testing for polymeric materials, including elastomers, thermoplastics, composites, coatings, and structural adhesives in a variety of industries.

Testing of rubber and elastomers is used to assess the various properties and performance of materials under different conditions. This is crucial for ensuring the safety, functionality, and quality of rubber and elastomer products used in industries such as automotive, construction, consumer goods, and aerospace.

Conduct adhesive testing using various testing methods to determine their performance and characteristics in applications across multiple industries such as aerospace, automotive, construction, packaging, industrial, medical, and energy, thereby supporting application development and quality assurance.

UnitedTest supply machine and testing solution for tension, compression, fracture toughness, direct shear, triaxial and ultrasonic velocity are common concrete and rock testing applications.

UnitedTest has helped a number of companies involved in the wood, paper, cardboard, and corrugated industry with their testing needs. Our materials testing systems are capable of testing raw materials, components, and finished products.

UnitedTest testing system is trusted by leading medical device manufacturers, universities, and medical research laboratories worldwide. Whether testing tissues or bioresorbable materials, stents, or sutures, UnitedTest offers a variety of single-actuator and dual-actuator systems to meet your biomedical testing needs.

Mechanical testing in the textile fabric industry determines core properties such as fabric tensile strength, tear resistance, and wear resistance, directly affecting product durability and safety. UnitedTest can cover comprehensive mechanical tests for textiles, complying with national standards / ISO standards, and provides customized testing solutions including tensile, tear, and puncture tests.

The mechanical testing of industrial components directly determines the load-bearing, fatigue resistance, and wear resistance of the parts, helping to avoid equipment failure risks. UnitedTest can cover a full range of tests including tensile, hardness, and fatigue, is compatible with ISO/ASTM/GB standards, and provides customized mechanical testing solutions for industrial components.

Mechanical testing in the glass-ceramics industry determines core properties such as flexural strength, hardness, and fracture toughness, directly helping to avoid brittleness and failure risks. UnitedTest can cover comprehensive testing for flexural strength, hardness, and fracture toughness, compatible with national and ISO/ASTM standards, and provides customized testing solutions.

Tensile test evaluates material resistance to stretching, measuring strength/elongation critical for quality control. UnitedTest offers universal tensile testers (10-600KN) compliant with ASTM/ISO standards, providing tailored solutions for metals, polymers, medical & industrial materials.

Compression test assesses material resistance to compressive loads, measuring strength/deformation critical for quality validation. UnitedTest offers compression testing machines compliant with ASTM/ISO standards, providing tailored solutions for concrete, plastics, metals and industrial components.

Flexural & Bend tests evaluate material resistance to bending forces, measuring strength, stiffness and ductility for quality assurance. UnitedTest provides flexural testing machines (3-point/4-point bend) compliant with ASTM/ISO standards, offering tailored solutions for composites, plastics, metals and construction materials.

Torsion Test evaluates material resistance to rotational forces, measuring torsional strength/ductility critical for fasteners, insulators, shafts. UnitedTest offers torsion testers compliant with ASTM A938/ISO 16047, providing tailored solutions for automotive, aerospace, fastener industries.

Fatigue Test assesses material durability under cyclic loading, critical for predicting service life of industrial components. UnitedTest offers fatigue testing systems (axial/bending/torsion) compliant with ASTM E466/ISO 12106, providing tailored solutions for automotive, aerospace and manufacturing sectors.

Peel Test measures material adhesion strength by evaluating resistance to peeling forces, critical for adhesives, films, packaging. UnitedTest offers peel testers compliant with ASTM D903/ISO 8510, covering 90°/180° peel tests, and tailored solutions for packaging, automotive, textile industries.

Impact Test evaluates material resistance to sudden shock loads, critical for assessing toughness and fracture risk. UnitedTest offers impact testers (Charpy/Izod/fall weight) compliant with ASTM E23/ISO 148, providing tailored solutions for metals, plastics, glass and industrial components.

Tear & Shear Test evaluates material resistance to tearing and shearing forces, measuring critical strength parameters for quality control. Tear tests (Elmendorf/trouser/trapezoidal) assess resistance to crack propagation in films/fabrics, while shear tests measure resistance to parallel forces in joints/bolts. UnitedTest provides universal testing machines (10KN-600KN) with specialized fixtures for both tests, compliant with ASTM D624/D3164 and ISO standards, serving automotive, packaging and construction industries.

Hardness test measures material's resistance to permanent indentation, critical for quality control. UnitedTest offers universal hardness testers (Rockwell/Brinell/Vickers) compliant with ASTM/ISO standards, plus tailored hardness testing solutions for diverse industrial needs.

Biaxial/triaxial tests evaluate material performance under multi-axis loads, critical for biomaterials, metals and composites. UnitedTest provides compliant testing machines (ASTM/ISO) for planar biaxial, static/fatigue triaxial tests, with tailored solutions for industrial & biomedical needs.

Friction and wear tests assess material resistance to friction, abrasion and wear, critical for industrial material performance validation. UnitedTest offers tribometers compliant with ASTM G99/ISO standards, covering pin-on-disk, four-ball tests, and tailored friction & wear testing solutions for diverse industries.

Pressure test evaluates material/component resistance to static/dynamic pressure, critical for sealing, strength and safety validation. UnitedTest offers pressure testing machines compliant with ASTM/ISO standards, covering burst, hold-pressure tests, and tailored solutions for industrial, automotive & medical sectors.

Fire test assesses material flammability, heat resistance and fire-retardant performance, critical for safety compliance across industries. UnitedTest offers fire testing equipment compliant with ASTM/ISO/UL standards, providing tailored fire test solutions for building materials, plastics and industrial components.

Non-destructive Test (NDT) evaluates material/component integrity without damage, critical for safety & quality across industries. UnitedTest offers ultrasonic/X-ray/magnetic particle NDT equipment compliant with ASTM/ISO standards, plus tailored NDT solutions for aerospace, automotive & manufacturing sectors.

ISO 8295 — Plastics – Film and Sheeting – Determination of the Coefficients of Friction

ISO 8295 specifies a standardized laboratory method to determine the static (starting) coefficient of friction and the dynamic (sliding) coefficient of friction of plastic films and sheeting — most commonly when the film slides over itself (film/ film) or over another substance (film/ metal, film/ other plastic surface, etc.).

Core Test Principle

Two flat specimen surfaces are placed under uniform vertical contact pressure from a standardized weighted sled. The machine records horizontal force required to generate relative sliding motion between the two surfaces. Two core friction values are captured and calculated via fixed formulas:

Static COF _μS	= F_S/ F_P	Force peak at the onset of motion
Dynamic COF _μD	= F_D/ F_P	Average sliding force over the first 6 cm after motion starts

Definition distinction: Static friction is the threshold resistance to initiate movement; dynamic friction is constant resistance during continuous sliding at set speed.

Longer contact time between surfaces increases static friction force, so standardized resting time (15 s) is enforced for consistent, comparable data.

Test Specimen Specification

Specimen size: Two pieces per measurement, each approx. 80 mm × 200 mm

Number of tests: Minimum three pairs, taken from points uniformly distributed over the roll/web width (or around circumference for tubular film);

Strict surface protection: Specimens must be free of fingerprints, dust, scratches, or contamination that alters surface slip additives bloom status. Cut multiple specimens at once and separate immediately before testing to avoid cross-contamination.

Pre-Conditioning Stipulation: All specimens must be conditioned minimum 16 hours under ISO 291 standard atmosphere: 23 °C, 50% relative humidity. Testing environment must match conditioning atmosphere entirely.

ISO 8295 Coefficient of Friction Test Required Equipment

Basically, should be an COF (Coefficient of Friction Specialized Tester), or universal testing machine with an COF test fixture:

Coefficient of Friction Tester	Coefficient of Friction Tester is professionally suitable for measuring the static friction coefficient and dynamic friction coefficient when plastic film and sheet, rubber, paper, cardboard, woven bag, fabric etc.,
Tensile test machine	Recommend UnitedTest WDW series testing machine. Drive speed control: Standard sliding speed = 100 mm/min ±10 mm/min; alternative speed 500 mm/min ±10 mm/min only permitted for special high-friction films, with deviation noted in final test report.
COF Test Fixture	Surface: Flat, smooth non-ferromagnetic metal, vibration-free horizontal movement Two apparatus layouts allowed: moving table fixed crosshead, or fixed table with moving sled pulled by tensile tester crosshead via horizontal pulley deflection.
Standard Sled	Total mass: 200 g ±2 g, delivers normal force Fp=1.96 N±0.02 N Contact base: Square shape, edge length 63 mm (40 cm² contact area) Base covering: Fine elastic felt to distribute uniform pressure and avoid embossing thin film specimens.
Auxiliary Accessories	Double-sided adhesive tape for specimen fixation, lightweight reinforcing plate (<5 g) for upper specimen edge, bubble level for table horizontal calibration, dust-free cleaning tools for specimen surfaces.

Key Mandatory Test Stipulations & Control Parameters

Contact resting time: Fixed 15 s before sliding to standardize static friction buildup (static friction rises with contact duration).

Speed tolerance: ±10 mm/min for 100 or 500 mm/min sliding speed.

Sled mass tolerance: ±2 g; contact area strictly 63 mm square with felt lining.

Force measurement error limit: ≤ ±2% full scale.

Environment control: Pre-condition ≥16 h at 23°C/50%RH; test in identical ambient conditions.

Reporting compliance: All deviations from standard parameters (e.g., 500 mm/min speed, non-standard counterface material) must be fully documented in the test report.

Surface handling ban: No touching test contact surfaces by hand; avoid dust or oil residue.

Step by step test procedure of ISO 8295 Coefficient of Friction Testing Plastic Film Sheeting:

Mode A: Film vs Film Friction Test

Fix lower specimen flat on horizontal table with double-sided tape, align long axis to sliding direction.

Attach thin reinforcing plate (<5 g) to left edge of upper specimen; connect plate to load cell via calibrated spring (static friction measurement setup).

Lay upper specimen evenly over lower specimen, gently place sled at upper specimen center without impact.

Eliminate all residual stress from the fixture, hold stationary contact for exactly 15 seconds.

Activate table horizontal movement and force recording simultaneously:

The first sharp force peak on the curve = static friction force F_s.

If force oscillation occurs after the peak (stick-slip), re-test dynamic friction with rigid connection (remove spring), this rigid setup cannot calculate static COF due to sled inertia error.

For dynamic friction calculation: Extract average force over the initial 60 mm sliding distance, ignore the static peak force.

Repeat full process for minimum three specimen pairs.

Mode B: Film vs Other Substrate (Metal/Glass/Rigid Plastic)

Replace the lower film specimen with target counter-material sheet; all sled, speed, conditioning, timing and calculation rules remain identical.

Important note: Repeated testing on the same rigid counterface will cause surface abrasion or slip agent transfer, altering subsequent friction data.

Application Industry Fields

Friction is the hidden variable that decides whether a high-speed packaging line runs or stalls.

Even though ISO 8295 isolates friction from complicating real-world factors, COF is the foundational physical property that governs all of the following:

Packaging & Converting Industry (primary field)

Problem	COF Link
Film jams or stretches on form-fill-seal (FFS) rails	μ too high
Film slips on rollers → registration / print misalignment	μ too low
Bags won't open / separate (poor "Openness")	μ too high between inner faces
Stacked bags slide off pallets	μ too low on outer faces
Additive migration ("blooming") changes slip over shelf life	COF drifts with film age — must be monitored

Other industrial fields

Printing & lamination — web handling, roller slip, register control

Medical device / pharmaceutical flexible packaging — sterile pouch films where controlled slip is critical

Automotive interior films — surface feel & anti-slip characteristics

Polymer R&D — quantifying effect of slip agents (erucamide, silica, etc.), coatings, corona/plasma treatment on surface tribology.

Production line operability judgement

Low dynamic COF ensures smooth unwinding, feeding and conveying on high-speed packaging machines, preventing film jamming, wrinkling or tearing. Excessively high static COF causes sheet blocking and production downtime.

Slip additive formulation optimization

Many plastic films contain slip additives that bloom to the surface over time, changing friction values. ISO 8295 standardized testing quantifies surface slip performance and tracks aging-dependent friction drift, guiding additive dosage adjustment.

Finished product anti-slip safety verification

High controlled static COF is required for pallet stretch films, floor protective films and food carrier packaging to prevent cargo sliding during storage and transportation.

Long-term surface stability assessment

The standard mandates specimen aging documentation in test reports, enabling manufacturers to predict how film slip performance changes during shelf storage (additive blooming or surface abrasion).

Related Test Standard:

ASTM D1894	Standard Test Method for Static and Kinetic Coefficients of Friction of Plastic Film and Sheeting
JIS K 7125	Plastics -- Film and sheeting -- Determination of the coefficients of friction
TAPPI T816	Coefficient of Friction of Paper and Paperboard
GB/T 10006	Plastics—Film and sheeting—Determination of the coefficients of friction

Coefficient of Friction Tester is professionally suitable for measuring the static friction coefficient and dynamic friction coefficient when plastic film and sheet, rubber, paper, cardboard, woven bag, fabric etc., Conform with ISO 8295, ASTM D1894.

WDW Series Computer Control Electronic Universal Testing Machine made by UNITEDTEST range from 100N to 600KN load capacity with various models like single columns, table type, door frame type etc., is used to perform tension, compression, flexure/bending, shearing, peeling etc., test for metal and nonmetal specimens.

T-Peel Resistance Test Fixture for Adhesives is based on ASTM D1876 standard, used to measure the adhesion strength of adhesive maeterial. ASTM D1876 peel strength test method is commonly used to measure the strength of adhesive bonds between two sealed materials.

Q1: What material range does ISO 8295 cover?

A: It applies to non-tacky plastic films and thin sheets with thickness up to 0.5 mm, for testing static and dynamic friction when sliding against identical film, metal, glass or other flat substrates. It is not suitable for highly sticky adhesive films, thick rigid plastic boards or textured rubber with deep embossments.

Q2: What is the main difference between ISO 8295 and ASTM D1894?

A: Both test COF via sled-platform structure, but critical differences exist:

ISO 8295 standard speed is 100 mm/min; ASTM D1894 uses 150 mm/min.

ISO 8295 requires a calibrated spring for static friction measurement to offset sled inertia; ASTM D1894 has no mandatory spring design.

ISO specifies a 15-second static contact waiting time before sliding; ASTM does not set fixed dwell time.

Sled accessory and specimen size parameters are not fully interchangeable, so test values cannot be directly cross-compared without joint verification.

Q3. Why is the ISO 8295 friction test so important for plastic films?

A: It translates a subjective "feel" (like "this film is sticky" or "this film is too slippery") into an objective, dimensionless number. For the packaging industry, this is critical because:

Line Efficiency: Films with a COF that is too high cause jams on form-fill-seal (FFS) machines; films with a COF that is too low cause slippage and misalignment.

Bag Opening: It predicts if a stack of bags can be opened easily by vacuum cups or by hand (High Static COF often means poor "openability").

Additive Control: It verifies if slip agents (like erucamide) are present in the correct concentration and have migrated properly to the surface.

Q4. What is "Stick-Slip" and why do I need a rigid connection to measure it?

A: "Stick-slip" is a jerky, unstable motion (often heard as "squeaking" on a production line) where the film sticks, releases, sticks, and releases again.

To measure Static COF, you need a spring to allow gradual acceleration.

To measure Dynamic COF during stick-slip, you must remove the spring and use a rigid connection. If you leave the spring in place, the oscillation of the spring will hide the true average sliding force.

Q5: Why does static friction force increase with surface contact time?

A: Microscopic adhesion forms between two polymer surfaces during contact. Longer dwell time strengthens intermolecular bonding, raising the force needed to initiate sliding. ISO 8295 enforces a fixed 15-second resting period to eliminate variable contact time errors and ensure repeatable results.

Q6: What moving speed does ISO 8295 mandate? When can we use 500 mm/min?

A: Standard test speed is 100 mm/min ±10 mm/min for all general films. 500 mm/min ±10 mm/min is only permitted for special high-friction films that produce unstable signals at low speed. Any non-standard speed must be clearly recorded in the final test report.

Q7: Why must we avoid touching specimen sliding surfaces with bare hands?

A: Finger grease, sweat, dust and skin residue contaminate the film surface. Slip additives on plastic film interact with contaminants, artificially raising or lowering friction coefficients and causing inconsistent test results.

Q8: When testing film against metal or other rigid substrates, what risk affects repeatability?

A: Repeated sliding on the same rigid counterface causes surface abrasion and transfer of film slip additives to the substrate. This changes surface friction characteristics, leading to drifting test values. Replace or thoroughly clean the counterface regularly between test batches.

We offer customization to meet your specific needs. Our expert team will collaborate with you to develop the perfect product for you