Rubber abrasion rate determination is a core performance test used to quantify how much material a rubber compound loses under controlled rubbing contact, expressed as volume loss in mm³ or as an abrasion resistance index. This guide explains the principle, sample requirements, and internationally recognized test methods—such as ISO 4649, ASTM D5963, DIN 53516, ASTM D1630, and ASTM D2228—used by accredited third-party laboratories to evaluate the wear life of tires, footwear, belts, seals, and other rubber products.
Technical Overview
Abrasion resistance is one of the most important durability properties of vulcanized rubber and thermoplastic elastomers. It describes the ability of a rubber surface to withstand material removal caused by sliding or rolling friction against another surface. The abrasion rate, also called the wear rate, is typically expressed as the volume of rubber lost (in mm³) under a standardized test condition, or as the abrasion resistance index (ARI), which compares the performance of the test compound against a certified reference compound.
Rubber wear is a complex phenomenon driven by several interacting mechanisms, including abrasive wear (cutting and ploughing by hard asperities), adhesive wear (formation and rupture of junctions between surfaces), fatigue wear (repeated deformation causing crack growth), and erosive wear (impact of loose particles). Because real-world wear depends on load, speed, temperature, and surface roughness, laboratory abrasion tests do not reproduce service conditions exactly; instead, they provide a controlled, repeatable basis for ranking materials, validating formulations, and performing quality control.
Modern abrasion rate determination relies on standardized apparatus such as the rotating cylindrical drum device (DIN abrader), the Taber rotary abraser, the NBS abrasion tester, and the Pico abrader. Test results are reported alongside the specific standard, method variant, applied force, abrasive type, and number of cycles, since these parameters strongly influence the measured value.
Testing Samples
Vulcanized Rubber Compounds
For the rotating cylindrical drum method (ISO 4649 / ASTM D5963), the preferred specimen is a cylindrical disc 16 mm in diameter with a minimum thickness of 6 mm, cut from a standard vulcanized test sheet or molded directly. Specimens must be free of voids, blisters, fabric impressions, and surface contamination.
Finished and Semi-Finished Products
Specimens can be cut or buffed from tire treads, footwear soles and heels, conveyor belt covers, hose covers, seals, gaskets, and rubber rollers. When the product is curved or fabric-reinforced, a flat test area of adequate thickness is prepared by cutting and buffing, taking care not to overheat the sample, since heat buildup can alter the surface properties of the rubber.
Sheet Materials and Coated Fabrics
For Taber-type rotary abrasion testing, flat discs approximately 100 mm in diameter (or 100 mm × 100 mm squares) are used. These are suitable for rubber sheets, floor mats, anti-slip mats, and rubber-coated textiles.
Thermoplastic Elastomers
TPE, TPU, TPV, and other thermoplastic elastomer materials can be evaluated with the same abrasion apparatus, provided the specimens are molded or cut flat and conditioned under the standard laboratory atmosphere (typically 23 °C and 50% relative humidity) before testing.
Testing Items
Typical test items and reported parameters in rubber abrasion rate determination include:
- Abrasion volume loss (relative volume loss, in mm³) under a specified force and travel distance
- Abrasion resistance index (ARI), the ratio of the volume loss of a standard reference compound to that of the test compound, expressed as a percentage
- Mass loss per unit travel distance or per unit number of cycles
- Specific wear rate (volume loss normalized by applied load and sliding distance)
- Number of abrasion cycles required to reach a defined endpoint, as used in NBS and Taber procedures
- Durometer hardness and density measurements, which are commonly determined together with abrasion testing to support interpretation of the results
Testing Methods
Rotating Cylindrical Drum Method (DIN Abrasion Test)
The most widely used procedure is specified in ISO 4649, ASTM D5963, DIN 53516, and GB/T 9867. A cylindrical specimen is pressed against the surface of a rotating drum, 150 mm in diameter and about 500 mm in length, covered with an abrasive cloth of specified grit (typically 60 grit). The specimen holder traverses along the drum length so that fresh abrasive is engaged continuously. In Method A, the specimen rotates around its own axis during testing to distribute wear evenly; in Method B, the specimen does not rotate. The standard test applies a force of 10 N over an abrasion travel distance of 40 m. The mass loss of the specimen is measured, and the volume loss is calculated by dividing the mass loss by the density of the rubber. Before testing, the abrasive cloth is conditioned by running a certified standard rubber compound, which allows the relative volume loss and the abrasion resistance index to be calculated.
Taber Rotary Abrasion Method
Specified for rubber and coated fabrics in ASTM D3389 and ISO 5470-1, the Taber method presses two rotating abrasive wheels of defined grade (commonly CS-10 for mild abrasion or H-18 for severe abrasion) against a flat specimen mounted on a rotating turntable. Loads of 500 g or 1000 g per wheel and cycle counts such as 500 or 1000 revolutions are typical. Results are expressed as mass loss or volume loss per 1000 cycles, or as wear cycles to a defined endpoint.
NBS Abrasion Test for Footwear
ASTM D1630 employs the NBS (National Bureau of Standards) abrasion tester, in which specimens of sole and heel rubber, typically 25 mm square and at least 6 mm thick, are rubbed against abrasive paper strips. The result is reported as the number of cycles required to abrade the specimen to a defined endpoint, often normalized against a standard compound. This method is widely referenced in footwear material specifications.
Pico Abrasion Test
ASTM D2228 uses a Pico abrader equipped with tungsten carbide knives of defined geometry that score the rubber surface under a specified load while the specimen rotates in a bed of abrasive powder. The test evaluates resistance to sharp, severe abrasion and is particularly useful for tread compounds and other high-durability applications. Results are expressed as an abrasion index relative to a reference compound.
Akron and Lambourn Abrasion Tests
Older but still referenced in some specifications, the Akron abrasion test rubs a driven rubber wheel at an angle against an abrasive wheel, while the Lambourn test abrades a rubber wheel against a rotating abrasive disc, often under controlled slip and temperature conditions. These methods were developed with tire wear simulation in mind and appear in selected national and industry standards.
Calculation of Results
The fundamental calculation converts measured mass loss into volume loss: the volume loss equals the mass loss divided by the density of the specimen. The relative volume loss corrects the measured value for the behavior of the abrasive cloth, established using a standard reference compound. The abrasion resistance index is calculated as the volume loss of the standard compound divided by the volume loss of the test compound, multiplied by 100. A higher abrasion resistance index or a lower volume loss indicates better wear performance. Because temperature rise during testing can significantly affect results, temperature-correction procedures and conditioned abrasive media are used where the applicable standard requires them.
Applications
Rubber abrasion rate determination supports material development, product qualification, and quality control across many industries:
- Tire industry: ranking tread compounds, evaluating filler systems such as carbon black and silica, and validating wear-related performance claims
- Footwear: assessing outsole and heel durability for leather shoes, safety footwear, sports shoes, and slippers
- Conveyor belting: verifying cover rubber wear life for mining, cement, and bulk material handling belts
- Automotive components: evaluating bushings, engine mounts, suspension parts, seals, wiper blades, and weatherstrips
- Industrial rubber goods: rollers, hoses, diaphragms, gaskets, linings, and protective rubber sheets
- Consumer and flooring products: floor mats, anti-slip surfaces, playground surfaces, and rubber tracks
- Research and development: studying the influence of polymer type, crosslink density, reinforcing fillers, plasticizers, and protective additives on wear behavior
FAQ
What is the difference between DIN abrasion and Taber abrasion testing?
DIN abrasion (ISO 4649 / ASTM D5963) presses a cylindrical specimen against a rotating drum covered with abrasive cloth, reporting volume loss in mm³ over a fixed travel distance. Taber abrasion (ASTM D3389 / ISO 5470-1) uses abrasive wheels on a flat rotating disc and reports mass or volume loss per number of cycles. The DIN method is the dominant method for bulk rubber compounds, while the Taber method is preferred for flat sheets and coated materials.
What does a lower abrasion volume loss mean?
A lower volume loss, or a higher abrasion resistance index, means that less material is removed under the same standardized conditions, which generally indicates longer service life in wear-related applications. However, abrasion results should always be compared only within the same test method, force, and abrasive specification, because values from different methods are not directly interchangeable.
What sample size and preparation are required?
For the DIN drum method, cylindrical discs 16 mm in diameter and at least 6 mm thick are required, and at least three specimens are usually tested to obtain an average. For Taber testing, flat specimens about 100 mm in diameter with a central mounting hole are used. Specimens should be conditioned at 23 °C and 50% relative humidity, and their density should be determined to allow conversion of mass loss to volume loss.
Which factors influence abrasion test results?
Key factors include the rubber formulation (polymer type, filler loading and particle size, crosslink density), test temperature, applied load, abrasive grit and its conditioning state, specimen geometry, and sliding velocity. Careful control of these parameters and the use of standard reference compounds are essential for reproducible results.
Can abrasion rate results predict real service life?
Laboratory abrasion values provide a reliable ranking of materials under identical test conditions and are invaluable for formulation development and specification compliance. Because actual service wear involves additional variables such as road surface, contamination, temperature, and mechanical stress, abrasion rate data should be combined with field testing and engineering judgment for full lifetime prediction.
Which standards should be specified when ordering a test?
The most commonly specified standards are ISO 4649, ASTM D5963, DIN 53516, and GB/T 9867 for the rotating drum method; ASTM D3389 and ISO 5470-1 for Taber abrasion; ASTM D1630 for NBS footwear abrasion; and ASTM D2228 for the Pico method. Specifying the exact method variant, force, abrasive grade, and reporting format ensures that results meet the intended regulatory or contractual requirements.