Operating Principle & Kinematics
The Taber rotary platform method evaluates surface wear resistance by rotating a flat specimen beneath a pair of loaded abrasive wheels. In the QualiTA-III Taber-Type Rotary Abrader, the specimen mounts onto a motor-driven turntable rotating at a fixed speed of 60 or 72 RPM, configured via a color touch screen interface. Two independent arms hold abrasive wheels against the specimen under a calibrated normal force.
As the turntable rotates, surface friction drives the two abrasive wheels to turn in opposite directions: one wheel rolling outward toward the perimeter and the other rolling inward toward the center.
This counter-rotational action generates a distinctive cross-hatched circular wear track covering approximately 30 cm². By abrading the surface from all vector angles relative to the material grain, the test provides an accurate simulation of multi-directional friction encountered during actual product use.
Standard Setup Parameters & Equipment Specifications
Test conditions are configured according to material characteristics and regulatory standards. The QualiTA-III accommodates standard flat specimens up to 6.35 mm thick (and up to 40 mm using optional specimen holders), featuring a quick-release mounting nut for tool-free wheel changes.
| Operating Parameter / Feature | Standard Specification & QualiTA-III Range | Applied Industry Standard |
|---|
| Turntable Rotation Speed | 60 ± 2 RPM (Metals, rigid plastics, hard coatings)
72 ± 2 RPM (Rubber, flexible polymers, textiles) | ASTM D4060, ASTM D1044, ISO 5470 |
| Applied Arm Mass | 250g, 500g, 750g, or 1,000g per wheel arm
(Selected via stainless steel weights marked for total load: Arm + Weight) | ASTM D3884, ISO 9352 |
| Abrasive Wheel Options | • CS-10 / CS-10F (Resilient rubber base, soft grit)
• CS-17 (Resilient rubber base, medium grit)
• H-18 / H-22 (Vitrified ceramic base, hard grit)
• S-33 (Coarse sandpaper strips) | CS-10/17: Paints, lacquers, smooth polymers
H-18/22: Anodized aluminum, hard ceramics
S-33: Technical leather, floor tiles |
| Control Interface & Cycle Counter | Color Touch Screen with preset cycle counter (0 to 999,999 cycles) and automatic shutdown | ASTM D4060, TAPPI T476 |
| Specimen Geometry | 100mm × 100mm square plate or Ø 110–120mm disc
(Standard thickness up to 6.35 mm; up to 40 mm optional) | Standard flat specimen holders |
Quantitative Measurement & Calculations
Abrasion damage is calculated using standardized mathematical methods following test completion on the touch screen cycle counter:
1. Taber Wear Index (I)
Measures the rate of mass loss in milligrams per 1,000 revolutions. A lower wear index indicates greater resistance against surface abrasion:
I = [(A - B) × 1,000] / C
Where:
- A = Specimen mass prior to testing (mg)
- B = Specimen mass following testing (mg)
- C = Total test revolutions completed
2. Total Weight Loss
Records net material mass removed (in milligrams) after a specified cycle count under a defined load:
Mass Loss (L) = A - B
3. Haze Development (For Transparent Materials)
For optical polymers, transparent films, and automotive glazing (ASTM D1044), wear is evaluated by measuring light scattering across the abraded track:
ΔHaze (%) = Hazeabraded - Hazeinitial
4. Cycles to Failure
Determines the total number of rotations required to abrade through a protective coating or surface layer down to the bare substrate.
Abrasive Wheel Maintenance & Refacing Protocols
Consistent abrasive action requires proper wheel selection and continuous surface reconditioning during testing.
- Resilient vs. Vitrified Wheels: Calibrase® wheels (CS-10, CS-17) feature a rubber base for smooth, resilient contact on coatings and plastics. Calibrade® wheels (H-10, H-18, H-22) utilize a vitrified clay matrix for aggressive cutting action on hard metals and ceramics.
- Wheel Refacing: Accumulation of abraded debris (glazing) reduces wheel efficiency. Wheels must be dressed using S-11 refacing discs prior to testing new specimens and every 500 to 1,000 cycles during extended runs.
- Continuous Vacuum Extraction: To prevent loose debris from building up and causing secondary scratching, the QualiTA-III includes an integrated precision vacuum cleaner with adjustable nozzle height to remove loose dust and particulates in real-time throughout the test.
Applicable Testing Standards
The QualiTA-III Taber-Type Rotary Abrader complies with international standard test methods:
- ASTM D4060: Organic Coatings on Rigid Substrates
- ASTM D1044: Resistance of Transparent Plastics to Surface Abrasion
- ASTM D3884: Textile Fabrics (Rotary Platform, Double-Head Method)
- ISO 5470: Rubber- or Plastics-Coated Fabrics
- ISO 9352: Plastics - Determination of Resistance to Wear by Abrasive Wheels
- DIN 53754: Abrasion Resistance of Paints, Varnishes, and Coatings
- JIS K7204: Abrasion Resistance of Plastics and Building Materials
- TAPPI T476: Abrasion Loss of Paper and Paperboard
