ASTM D3991 - 94(2012)e1

    Standard Specifications for Fineness of Wool or Mohair and Assignment of Grade

    Active Standard ASTM D3991 | Developed by Subcommittee: D13.13

    Book of Standards Volume: 07.01


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    ASTM D3991

    Significance and Use

    These specifications are considered satisfactory for classifying wool or mohair by grade and provide a basis for acceptance of commercial shipments.

    Grade determined by visual examination is a common trade practice. In case of doubt or dispute, comparison of the measured average fiber diameter and fiber diameter standard deviation with the respective specification shall be used as the referee procedure for assigning grade.

    This specification is not intended for application to mixed lots, that is, lots of wool or mohair consisting of fleeces of different grades that are to be segregated into smaller more homogeneous lots before use.

    1. Scope

    1.1 These specifications cover the classification, by fineness grade, of wool or mohair that is in the grease, pulled, washed, or scoured state, or in the form of card sliver.

    1.2 These specifications are applicable also to assignment of grade for wool or mohair in spun materials or products processed beyond carding on the woolen system but not on the worsted system which involves a combing process.

    Note 1—For fineness specifications for wool top, mohair top, and alpaca, refer to Specifications D3992 and D2252.


    2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

    ASTM Standards

    D123 Terminology Relating to Textiles

    D2130 Test Method for Diameter of Wool and Other Animal Fibers by Microprojection

    D2252 Specification for Fineness of Types of Alpaca

    D3992 Specifications for Fineness of Wool Top or Mohair Top and Assignment of Grade

    D4845 Terminology Relating to Wool

    Federal Standards

    MeasurementMethodfor


    ICS Code

    ICS Number Code 59.060.10 (Natural fibres)

    UNSPSC Code

    UNSPSC Code 11151508(Wool fibers)


    DOI: 10.1520/D3991-94R12E01

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