Pilling
Also searched as: pills, bobbling, fabric pills
The formation of small fiber balls on a fabric surface through wear and friction.
In detail
Pilling is the development of small entangled balls of fiber on a fabric surface. Wear and rubbing can bring fibers together into these visible clusters. High-contact regions, such as areas rubbed by sleeves or bags, may look different from less-exposed parts of the same garment.
The science and numbers
Gintis and Mead described pilling as overlapping stages: abrasion draws loose fiber ends to the surface as fuzz, rubbing entangles that fuzz into pills once its density reaches a critical level, and further abrasion eventually breaks the anchoring fibers so pills wear off. Visible pill count is a balance of formation and loss. Interfiber friction and bending stiffness influence fuzz formation; fiber fineness, cross-sectional shape and stiffness influence entanglement; tenacity and flex-abrasion resistance govern wear-off, so strong polyester fibers can hold pills that weaker fibers would shed. Standard tests accelerate this: ISO 12945-1 tumbles specimens in a rotating pill box, ISO 12945-2 rubs them against a standard abradant in a modified Martindale tester, and ISO 12945-3 and ASTM D3512 use random tumbling. Specimens are rated against photographic references from 5 (no change) to 1 (very severe). ASTM D3512 is harsher than the ISO tumble method and not directly comparable.
A practical example
When assessing a sweater, compare a frequently rubbed area with a protected area. Record the exposure and care history before drawing conclusions. A laboratory pilling result is also meaningful only with its method and test conditions; it is not a guarantee for every wearer.
What to distinguish
Pills are not the same as loose lint, and pilling alone does not identify fiber composition. Follow garment care guidance and use any removal method cautiously to avoid damaging the underlying fabric.
Origins and history
A widely cited analysis of the process is Gintis and Mead, 'The Mechanism of Pilling', Textile Research Journal, 1959. The pill box method now in ISO 12945-1 derives from an apparatus developed at Imperial Chemical Industries (ICI). The Martindale tester dates to 1942, when James Graham Martindale of the Wool Industries Research Association in the UK was asked to test carbon-impregnated cloth intended to protect against gas; workshop head Stanley Dilworth built the first machine and James H. Heal manufactured it. Its rubbing path traces Lissajous figures, named after the French physicist Jules A. Lissajous.
Related terms
Sources & further reading
- CottonWorks: Pilling
- Woolmark: Pilling care factsheet
- Textile Research Journal: The Mechanism of Pilling (Gintis and Mead, 1959)
- ISO 12945-2:2020, Determination of fabric propensity to surface pilling, fuzzing or matting, Part 2: Modified Martindale method
- ASTM D3512/D3512M: Pilling resistance, random tumble pilling tester
- Science Museum Group Collection: Martindale abrasion tester
- Innovation in Textiles: The Martindale abrasion tester at 80
Technical references reviewed 2026-09-22. Examples are illustrative. Industry organizations and manufacturers describe their own fields; their references are not independent product endorsements. Figures are approximate and depend on the stated test conditions.