ASTM
ASTM D1425 Standard Test Method for Unevenness of Textile Strands Using Capacitance Testing Equipment
WITHDRAWN IN 2005. The capacitance evenness test — U%, CV%, thin places, thick places, neps — as an ASTM method. The test is still run every day; this document is no longer maintained.
- Number
- ASTM D1425
- Committee
- ASTM D13.58
- Status
- withdrawn
Verification coverage
Not yet checked: ISO, AATCC, BIS, SAC, JIS, EN, DIN — an absent row here does not mean no equivalent exists.
What this standard is for
Where it is used
Named in older mill specifications and in a great deal of teaching material, including seven calculators on this site.
Why it matters
Evenness governs yarn appearance, strength variability and end breakage, so the measurement matters as much as it ever did. What has gone is the ASTM text describing it: practice now follows the instrument makers' own methods and the Uster Statistics benchmarks rather than a published consensus standard.
What to watch for
A specification that still names D1425 is naming a document withdrawn twenty years ago. That is not automatically a problem — everyone knows what is meant — but it cannot be audited against, and a laboratory cannot issue a report to a withdrawn method. Establish which instrument, which test speed and which Uster percentile the buyer actually means before agreeing a limit.
Calculators that implement this
- Card Sliver Draft, Can Capacity & Change Interval
- Drawframe Draft, Doubling & Drafting-Wave Decomposition
- Ring-Frame Drafting Zone Settings & Irregularity Floor
- Roving Bobbin Build, Doff Interval & Changeover Loss
- Roving Hank to Yarn Count Draft Predictor
- Sliver Coil Geometry, Can Packing Density & Capacity
- Winding Production, Splice Loss & Effective Drum Efficiency
- Yarn Clearer Cut Rate, Splice Load & Clearing Efficiency
Buy the official copy from ASTM
Metadata only — purchase the standard from the issuing body.
Report incorrect information on this page
Tell us what is wrong and we will check it against the source. Reports are private, are never published, and go to an editor rather than into a comment thread.