Falling Sand Abrasive Test (ASTM D 968)
"Standard Test Method for Abrasion Resistance of Organic Coatings by Falling Abrasives"
ASTM D968 measures the resistance of organic coatings to abrasion caused by abrasives falling onto coatings applied to planar rigid surfaces such as metal or glass plates. The abrasive is allowed to drop through the conduit from the specified height onto the coated plate until the substrate becomes visible. The amount of abrasive per unit film thickness is reported as the abrasion resistance of the coating on the panel. Silica sand or silicon carbide can be used.
Air Impact Abrasion Test (ASTM D658)
"Standard Test Method for Abrasion Resistance of Organic Coatings by Air Blasting Abrasives"
Method ASTM D 658 covers the determination of the resistance of organic coatings to abrasion produced by abrasive blasting of coatings on planar rigid surfaces such as metal or glass plates.
The abrasive, propelled by a controlled flow of air, is allowed to impinge on the coated panel until the substrate beneath the coating becomes visible. The amount of abrasive used per unit film thickness is reported as the abrasion resistance of the coating. Since the abrasive flow is facilitated by air blast, the wear rate is significantly greater than that obtained with free-falling abrasive.
Although this method has been obsoleted by ASTM, the method still has many applications, especially in support of research on wear-resistant coatings.
Testing of Taber Abraser Organic (Paint) Coatings - ASTM D4060
Test method ASTM D4060 covers the determination of the resistance of organic coatings to abrasion from Taber Abraser coatings applied to flat rigid surfaces such as metal panels.
The organic coating to be tested is applied to a flat rigid plate at a uniform thickness, and after curing, the surface is abraded by rotating the plate under a weighted abrasive wheel.
ASTM D 4060 can be used to evaluate the abrasion resistance of adherent coatings. Abrasion resistance can be calculated in three ways: weight loss at a specific number of wear cycles, weight loss per cycle, or the number of cycles required to remove a unit amount of coating thickness.
Reference: ASTM D 4060 Taber Abraser Standard Test Method for Abrasion Resistance of Organic Coatings
