The Taber Abrasion Test Method is a widely used laboratory technique for evaluating the abrasion and wear resistance of coatings, plastics, laminates, textiles, and other flat materials. By pressing two standardized abrasive wheels against a rotating specimen under controlled loads, the test quantifies material loss and surface degradation in a reproducible manner. This article explains the technical principle, applicable standards, sample requirements, testing procedure, calculation methods, and typical industrial applications of the Taber abrasion test.
Technical Overview
The Taber Abrasion Test, performed with a Taber Abraser (Rotary Platform Double-Head Abrader), is one of the most widely recognized bench-scale methods for measuring the abrasion resistance of rigid and flexible flat materials. The instrument was developed by Taber Industries and has since been incorporated into numerous international standards, including ASTM D4060, ASTM D1044, ASTM D3389, ISO 9352, and ISO 8251.
The operating principle is straightforward: a flat specimen is mounted on a turntable that rotates at a fixed speed, typically 60 revolutions per minute. Two abrasive wheels are positioned on opposite sides of the specimen and pressed against its surface under a defined dead-weight load. As the specimen rotates, friction drives the wheels to rotate as well, producing a characteristic ring-shaped wear track through a combination of rolling and sliding abrasive action. A built-in vacuum system continuously removes loose debris from the wear track to prevent interference with the abrading process.
Test results are usually expressed as weight loss, the Taber Wear Index, volume loss, or the number of cycles required to reach a defined failure condition. Because the test parameters—wheel type, load, and cycle count—can be precisely controlled, the method provides a reliable basis for comparing the relative abrasion resistance of different materials or coating systems.
Testing Samples
Rigid Flat Materials
Specimens for the Taber test are typically flat discs or squares with a diameter or side length of approximately 100 mm (4 inches) and a central hole of about 6.35 mm (0.25 inch) for mounting on the turntable spindle. Typical rigid materials include plastic sheets, laminate panels, ceramic tiles, glass, anodized aluminum, and painted or powder-coated metal panels.
Coated Panels and Organic Coatings
For coatings tested in accordance with ASTM D4060, the coating is applied to a rigid substrate such as steel or aluminum panels. The coating must be fully cured and conditioned before testing so that the measured weight loss reflects only the mechanical wear behavior of the coating system.
Flexible Materials
Coated fabrics, leather, films, and other flexible materials tested under ASTM D3389 are usually backed with a rigid support plate to ensure a flat, uniform abrading surface. Flexible specimens must be free of wrinkles and mounted tautly to guarantee consistent contact between the abrasive wheels and the material surface.
Specimen Conditioning
Prior to testing, specimens are conditioned in a controlled atmosphere, commonly 23 ± 2 °C and 50 ± 5% relative humidity, in accordance with standards such as ASTM D618 for plastics. Proper conditioning is essential because temperature and humidity can significantly influence the wear behavior of both the specimen and the resilient rubber-bonded abrasive wheels.
Testing Items
Depending on the material and the governing specification, the Taber test can be used to determine the following quantities:
- Weight loss: the mass difference of the specimen before and after a specified number of abrasion cycles, reported in milligrams.
- Taber Wear Index: the weight loss normalized to 1,000 cycles, calculated as (A − B) × 1000 / C, where A is the initial mass, B is the final mass, and C is the number of cycles.
- Volume loss: the weight loss divided by the material density, useful when comparing materials of different densities.
- Cycles to wear-through: the number of cycles required to expose the substrate or underlying layer, often used for paint and coating qualification.
- Increase in haze: for transparent plastics tested under ASTM D1044, the change in light transmission haze is measured according to ASTM D1003 after specified abrasion intervals.
- Visual and instrumental surface changes: gloss loss, color change, scratching, marring, or other visible alterations of the abraded area.
Testing Methods
Abrasive Wheels and Loads
The choice of abrasive wheel determines the severity of the test. Resilient rubber-bonded wheels (Calibrase series, such as CS-10 and CS-17) are commonly used for coatings, anodized aluminum, and transparent plastics, while hard vitrified wheels (Taber series, such as H-10, H-18, H-22, and H-38) provide more aggressive abrasion for flooring, laminates, and other demanding applications. CS-10 wheels produce relatively fine abrasion, whereas CS-17 wheels exert a more severe cutting action. Standard counterweights allow loads of 250 g, 500 g, or 1,000 g per wheel, selected according to the material and specification.
Wheel Refacing
To maintain a consistent abrasive surface, the wheels must be periodically refaced using designated abrasive refacing discs. Refacing removes embedded debris and worn abrasive grains, restoring the cutting efficiency of the wheels. Standards and manufacturer guidance specify refacing intervals, and wheels that show uneven wear, glazing, or degradation beyond acceptable limits must be replaced.
General Test Procedure
Although details vary between standards, a typical Taber abrasion test follows these steps:
- Condition the specimen and, where required, the abrasive wheels in the specified atmosphere.
- Resurface the wheels and verify their condition before mounting.
- Weigh the clean specimen to the required precision and record the initial mass.
- Mount the specimen centrally on the turntable and install the selected wheels and counterweights.
- Adjust the vacuum nozzle height and suction so that loose particles are removed from the wear track without disturbing the specimen.
- Run the instrument for the specified number of cycles, refacing the wheels at prescribed intervals if required.
- Clean the specimen thoroughly to remove all abraded debris, then reweigh it.
- Calculate the weight loss, wear index, or other specified parameters and visually examine the wear track for failure criteria.
Governing Standards
ASTM D4060 covers the abrasion resistance of organic coatings by the Taber Abraser; ASTM D1044 addresses surface abrasion of transparent plastics by measuring haze development; ASTM D3389 applies to coated fabrics; ISO 9352 specifies a rotating abrasive wheel method for plastics; and ISO 8251 governs wear resistance testing of anodized aluminum. Users should always verify the current edition of the applicable standard, as procedures and precision statements are periodically revised.
Applications
The Taber abrasion test is applied across a broad range of industries for material qualification, quality control, and research and development:
- Paints and coatings: evaluating organic coatings, powder coatings, coil coatings, and refinish systems for architectural, industrial, marine, and transportation uses.
- Plastics and transparent materials: assessing hard-coated polycarbonate glazing, headlamp lenses, instrument panels, and display windows through haze or weight-loss measurements.
- Flooring and furniture: ranking the durability of resilient flooring, wood laminates, high-pressure laminates, and decorative surfaces.
- Anodized aluminum: verifying wear resistance of architectural anodized finishes under ISO 8251 and related qualification schemes.
- Textiles and coated fabrics: testing upholstery, protective coatings, and technical textiles under ASTM D3389.
- Consumer electronics and printing: screening scratch and abrasion resistance of housings, keypads, UV-cured topcoats, printed labels, and packaging films.
- Aerospace and medical devices: qualifying surface treatments, functional coatings, and durable component finishes.
FAQ
What does the Taber test actually measure?
The Taber test measures the resistance of a flat material surface to abrasion caused by rotating abrasive wheels. The result is most commonly reported as weight loss in milligrams, the Taber Wear Index per 1,000 cycles, or the number of cycles needed to reach a defined failure such as substrate exposure or a haze limit.
What is the difference between CS-10 and CS-17 wheels?
Both are resilient rubber-bonded wheels, but CS-10 produces a milder, finer abrasive action suited to coatings and transparent plastics, while CS-17 delivers a more severe cutting action used for tougher or thicker materials. Because rubber-bonded wheels are sensitive to humidity and aging, they must be conditioned, refaced, and replaced according to the standard to maintain reproducibility.
How is the Taber Wear Index calculated?
The wear index equals the specimen weight loss multiplied by 1,000 and divided by the number of test cycles. A lower wear index indicates better abrasion resistance, provided that wheel type, load, speed, and environmental conditions are identical.
How many cycles should be run?
The cycle count depends entirely on the material and the governing specification, and typical values range from 100 cycles for soft coatings to 10,000 cycles or more for durable anodized or laminated surfaces. The chosen cycles should produce measurable wear without completely penetrating the material unless wear-through is the intended endpoint.
Why must the abrasive wheels be refaced?
During testing, abrasive grains wear down and specimen debris can clog the wheel surface, a condition known as glazing. Refacing on abrasive discs restores the original cutting texture and removes contamination, which is essential for obtaining consistent and comparable wear rates throughout a test series.
Are Taber results directly comparable between laboratories?
Interlaboratory agreement is generally limited because results depend strongly on wheel history, humidity, vacuum adjustment, and operator technique. Taber data should therefore be treated as a comparative ranking tool within a defined set of test conditions rather than an absolute material property, and the full test parameters should always be reported alongside the results.
