There are two different tests for pilling on the upholstery that ACT recognizes – ASTM D3511 Brush Pilling Test and ASTM D4970 Martindale Pilling Test.
There are two different tests for pilling on the upholstery that ACT recognizes – ASTM D3511 Brush Pilling Test and ASTM D4970 Martindale Pilling Test.