Cotton Fibre Testing
category
Cotton fibre testing measures the seven USDA classing properties (micronaire, length, uniformity, strength, elongation, reflectance, yellowness) by HVI and provides single-fibre distribution data by AFIS, collectively determining raw cotton market value and spinning process parameters. HVI (High Volume Instrument, USTER HVI 1000, Premier ART 2) classing processes 100 g samples in 60 seconds on 20+ million bales annually — each 227 kg bale value adjusted by $5–200 versus base grade depending on HVI results. AFIS Pro 2 (Trützschler) complements HVI by measuring individual fibre properties: nep count and size, short fibre content (SFC% by number and weight), length distribution (Lw, Ln, CV%), trash particle count and size, and seed coat nep count — 3,000–5,000 fibres measured per test in 3–5 minutes. Cotton fibre testing standards: ASTM D5867 (HVI), ASTM D1448 (micronaire), ASTM D1445 (bundle strength), ASTM D1447 (length uniformity), and ISO 4912 (micronaire calibration). USDA cotton classing generates 15 million HVI test records annually from 11 classing offices, producing the world's largest publicly accessible fibre quality database used by traders, mills, and breeders globally.
Role
Cotton fibre testing is the commercial and technical interface between cotton farming and textile manufacturing — HVI test results determine the $40–50 billion annual value distribution across global cotton trading, while AFIS data provides the process intelligence that allows spinning mills to predict and control yarn quality from raw material input to finished yarn output.