Abrasion Resistance
Standardized rotary abrasion testing quantifies mass loss from flat rubber or plastic coated fabrics exposed to abrasive wheels under defined mechanical loads. Specimen discs rotate against abrasive wheels for a specified cycle count, after which technicians measure mass differential using analytical balances. Under laboratory evaluation, ISO 5470 1 wear index provides a numerical value expressing milligrams of material lost per thousand rotation cycles.
The standard covers flexible polymer coated substrates and stops at uncoated paperboard or rigid unreinforced plastics.
Test Protocol
Specimen preparation requires conditioning at twenty-three degrees Celsius and fifty percent relative humidity to stabilize polymer properties. Abrasive wheels must undergo resurfacing before testing to maintain consistent grit sharpness across comparative runs. Vacuum suction nozzles continuously extract abraded debris, preventing loose particles from altering friction coefficients between wheel and specimen.
Mass determinations require precision balances sensitive to fractional milligrams to capture subtle abrasive losses accurately. Discrepancies in wheel density or suction airflow distort mass loss values, compromising test repeatability between testing facilities.
Coating Durability
Lower index values indicate superior resistance to mechanical rub during transit and handling. Packaging specifiers select high-performing polymer coatings for heavy industrial sacks to prevent protective layer failure under severe friction conditions.
