Martindale Abrasion Resistance Test

Martindale abrasion testing (ISO 12947-1 to -4, SDL Atlas M235, James Heal TF197) subjects circular fabric specimens (diameter 38 mm for ISO 12947-2 or 140 mm for ISO 12947-3 mass loss method) clamped in specimen holders to a Lissajous figure rubbing motion against a standard abradant (worsted wool plain weave fabric, SMS 9 specification, replaced every 50,000 rubs) under specified normal load (9 kPa = 155 g ± 1 g for apparel, 12 kPa = 795 g ± 7 g for upholstery). Endpoint determination methods: ISO 12947-2 (specimen breakdown — two thread breaks in woven fabric, or hole appearance 0.5 mm diameter in knit/nonwoven, inspected every 1,000 rubs up to 5,000, every 2,000 rubs to 20,000, every 5,000 rubs above 20,000 — test stops at first specimen endpoint, highest confirmed cycle count ×0.8 safety factor reported); ISO 12947-3 (mass loss — 25 mm × 25 mm specimens weighed before and after specified cycles, mass loss mg reported); ISO 12947-4 (appearance change — 6-point scale visual assessment after specified cycles). Instrument features: 9 independent specimen positions per SDL Atlas M235 machine; speed 47.5 ±2.5 rpm equivalent to approximately 60 Lissajous cycles/min; electronic revolution counter ±5 revolutions. Construction effect on Martindale result: plain weave cotton 200 g/m² 20,000–30,000 rubs; twill weave (same yarn) 30,000–45,000 rubs (25–50% higher — reduced over-yarn float length); polyester jersey (160 g/m²) 15,000–25,000 rubs; polyester microfibre woven (100 g/m²) 40,000–80,000 rubs (finer fibre more flexible, resists yarn breakage mechanism). Abradant replacement frequency critical: worn abradant (>50,000 rubs service) gives 15–25% higher cycle counts versus fresh abradant — standardised replacement protocol essential for inter-laboratory reproducibility.