Martindale Pilling Resistance Test
topic
Martindale pilling test (ISO 12945-2) subjects 38 mm diameter fabric specimens mounted in Martindale specimen holders under 1.96 kPa (200 g) load to Lissajous rubbing motion against grey knitted polyamide abradant fabric (SMS 25 specification) — lower load than abrasion test (9 kPa) to generate surface entanglement without yarn breakage. Evaluation intervals: knitwear assessed after 125, 500, 1,000, 2,000 cycles; wovens after 250, 500, 1,000, 2,000, 5,000 cycles — graded against EMPA photographic reference standard at each interval under D65 illuminant at 1,000 lux with trained assessor. Grade scale 1–5: Grade 5 = no change in surface appearance; Grade 4 = slight surface fuzzing and/or beginning of formation of pills; Grade 3 = moderate pilling, balls varying in size and density cover part of surface; Grade 2 = pronounced pilling, balls varying in size and density cover large portion; Grade 1 = dense pilling, balls varying in size and density cover entire surface. Automated pilling assessment (Textechno PillGrade, SDL Atlas Pilling Rater, digital camera + image analysis): objectifies grade assessment by measuring pill count, pill density, pill projected area ratio — correlation with visual grade R² = 0.88–0.92, reproducibility CV% < 5% versus visual CV% 8–15%. Fibre effect on pilling grade at 2,000 Martindale cycles: 100% cotton jersey grade 4.5; 100% cotton-polyester 50/50 grade 2.5 (polyester anchors pills, cotton provides fuzz supply); 100% polyester microfibre (1.0 dpf) grade 2.0; compact ring cotton (low hairiness H = 2.5) grade 4.5 versus standard ring (H = 5.8) grade 3.5 — hairiness is the primary determining variable. Enzyme biopolishing (cellulase, 0.5–2.0% owf, 55°C, 60 min) removes protruding cotton surface fibres reducing pilling by 1–1.5 grade improvement: from grade 3 to grade 4–4.5 for cotton-rich blends.
Role
Martindale pilling testing is the universal pilling quality specification in European and global retail apparel buying, with pilling grade at 2,000 cycles being the single most commonly tested and most frequently failed mechanical specification in knitwear quality assurance — making pilling test results the primary driver of raw material selection decisions (compact versus standard ring yarn, fibre blend ratios) and finishing process choices (biopolishing, anti-pilling finishes) in knitwear production.