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ASTM D1894 · TAPPI T-815 — Static & Kinetic COF

C.O.F. Tester (Static & Kinetic Friction Tester)

A coefficient-of-friction tester for the static and kinetic COF of plastic films and sheeting — available as a horizontal-sled model to ASTM D1894 and an inclined-plane model to TAPPI T-815.

  • Static & kinetic COF to ASTM D1894
  • Capacity up to 9.999 kg; 150 mm/min; 200 g sled
  • Computerised model: RS232, PC graphing & 10-sample statistics
  • Inclined-plane model to TAPPI T-815 (film-to-film, metal, glass)
Made in IndiaISO 9001:2015CE CertifiedExported to 60+ countries
Overview

Control how film slips and stacks

Coefficient of friction (COF) decides how film runs on high-speed machinery and how packs stack: too high and film jams the line, too low and stacked packs slide. COF is set by slip and anti-block additives and must be controlled batch to batch.

International Equipments builds two COF instruments: a horizontal-sled Static & Kinetic Friction Tester to ASTM D1894, and an Inclined Plane Tester to TAPPI T-815. The computerised sled model adds PC Load-vs-travel graphing and 10-sample statistics. Manufactured in Mumbai, CE marked and calibration-certified.

Models

Two COF models

Choose the horizontal-sled or inclined-plane method for your standard.

Static & Kinetic Friction Tester — ASTM D1894

Horizontal-sled method: capacity up to 9.999 kg, 150 mm/min, 200 g sled and three SS templates, with direct static & kinetic COF. The computerised model adds a microcontroller with RS232, PC software for Load-vs-travel graphing, result storage and printout, and merging of 10 samples with mean & standard deviation.

Inclined Plane Tester — TAPPI T-815

Tilting-plane method at 1.5°–2.0° per second with a 750 g, 4″ × 2″ sled and two SS templates — for film-to-film, film-to-metal and film-to-glass friction.

How the test works

Step by step

  1. Mount the surfacesFix one film to the sled and one to the plane using the stainless steel templates.
  2. Set the speedSet 150 mm/min for the ASTM D1894 horizontal-sled method.
  3. Pull the sledThe sled is drawn across the surface while the tester records the static (start) and kinetic (sliding) friction.
  4. Read the COFStatic and kinetic COF are shown directly, and graphed on the computerised model.
Technical Specifications

C.O.F. Tester (Static & Kinetic Friction Tester) specifications

Specifications for the Static & Kinetic (ASTM D1894) model; the Inclined Plane model runs at 1.5°–2.0°/s with a 750 g sled.

StandardsASTM D1894; TAPPI T-815 (inclined-plane model)
CapacityUp to 9.999 kg
MeasurementStatic & kinetic COF (direct display)
Speed150 mm/minute
Weight of sled200 g
AccessoriesThree SS templates
Computerised optionMicrocontroller with RS232 & PC software — Load vs travel graph, storage, printout, merge 10 samples with mean & SD
PaintPowder coated
Power230 V, 50 Hz, single phase
Applications

Where it's used

Film machinabilityEnsuring film runs smoothly on filling lines.
Stacking stabilityPreventing pack slippage on pallets.
Slip additive QCVerifying slip and anti-block additive levels.
LaminatesSurface friction of printed and coated laminates.
Incoming QCBatch-to-batch COF consistency.
R&DAdditive and surface-treatment development.
FAQ

Frequently asked questions

What is the difference between static and kinetic COF?
Static COF is the resistance to start sliding; kinetic COF is the resistance while sliding. The tester displays both directly per ASTM D1894.
ASTM D1894 or the inclined-plane model — which do I need?
The horizontal-sled ASTM D1894 model is the standard for plastic film COF. The inclined-plane model (TAPPI T-815) tilts a plane until the sled slides and covers film-to-film, film-to-metal and film-to-glass.
Why does COF matter for film?
It governs how film runs on packaging machinery and how packs stack — controlled by slip and anti-block additives, so it is a routine QC check.
What does the computerised model add?
RS232 and PC software for Load-vs-travel graphing, result storage and printout, and merging 10 samples with mean and standard deviation.
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