ISO 2647-2020 PDF

Full title and description

St ISO 2647-2020 — Wool — Determination of percentage of medullated fibres by the projection microscope. This International Standard specifies a laboratory method using a projection microscope to determine the percentage of medullated (i.e., hollow or partially hollow) fibres in wool and worsted products at all stages from raw wool to yarn.

Abstract

ISO 2647:2020 defines sample preparation, microscope projection technique, counting procedures and calculation rules to estimate the percentage of medullated wool fibres (expressed as percentage of total fibre length measured) using a projection microscope. The method is intended for routine quality control, research and trade-related testing where a length-biased estimate of medullation content is required.

General information

• Status: Published (current edition).
• Publication date: July 2020 (Edition 2, 2020).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 59.060.10 — Natural fibres.
• Edition / version: Edition 2 (2020).
• Number of pages: 6 (ISO metadata).

Scope

The standard applies to wool and worsted products at all stages of production and processing (from raw wool to yarn). It covers the preparation of fibre specimens, the use of a projection microscope to observe and classify fibres as medullated or non-medullated, the counting protocol, calculation of percentage medullation (length-biased), and reporting of results. The method provides an estimate of the percentage of medullated fibres by length and is not intended to measure medullation volume or fibre density.

Key topics and requirements

• Specimen preparation and conditioning to obtain representative, length-biased samples for projection microscopy.
• Projection microscope setup and magnification, illumination and calibration requirements.
• Definition and visual criteria for identifying medullated fibres under projection microscopy.
• Counting procedure, sample size and statistical considerations to calculate percentage medullation by length.
• Calculation formulae, expression of results and required reporting elements (sample ID, test conditions, result as % medullated fibres by length).
• Limitations of the method (length-biased estimate; not a volumetric or density measurement) and recommended interpretation guidelines.

Typical use and users

Used by textile testing laboratories, wool brokers and traders, yarn and fabric manufacturers, quality control personnel, research institutions working on fibre characterization, and certification/inspection bodies. Typical applications include acceptance testing, quality control during processing, product characterization for supply-chain specifications, and research into fibre properties and breed/production effects on medullation.

Related standards

Standards commonly referenced alongside ISO 2647:2020 include ISO 137 (fibre diameter — projection microscope method), ISO 2648 (fibre length distribution methods), ISO 6938 (textiles — natural fibres — generic names and definitions), and other ISO/TC 38 wool and fibre testing methods addressing preparation, conditioning and complementary measurements.

Keywords

wool; medullated fibres; projection microscope; fibre testing; worsted; textile quality control; ISO 2647:2020; natural fibres; fibre analysis.

FAQ

Q: What is this standard?

A: ISO 2647:2020 is an International Standard that specifies a projection-microscope method to determine the percentage of medullated wool fibres (expressed as percentage of total measured fibre length).

Q: What does it cover?

A: It covers specimen preparation, projection microscope setup, visual criteria for medullation, counting procedures, calculation of percentage medullated fibres by length, reporting requirements and method limitations.

Q: Who typically uses it?

A: Textile and wool testing laboratories, manufacturers, traders, quality managers, research organisations and certification bodies involved in wool and worsted product testing and specification.

Q: Is it current or superseded?

A: The 2020 edition (Edition 2) is the current version, published in July 2020. It replaced ISO 2647:1973 and is the authoritative edition for this method.

Q: Is it part of a series?

A: It is part of the ISO/TC 38 portfolio of textile and wool testing standards and is often used alongside related methods for fibre diameter, length distribution and other textile testing standards.

Q: What are the key keywords?

A: Medullated fibres, projection microscope, wool testing, percentage medullation, worsted, fibre analysis, ISO 2647.