Yarn spun from linen fibers. Linen yarn is usually measured in metric units (Nm) to indicate its thickness. For example, pure linen yarn 36N (L36N) represents that one kilogram of raw material can spin 36 pieces of 1000 meters long. Flax fiber is the earliest natural fiber used by humans and the only bundle plant fiber among natural fibers. It has a natural spindle shaped structure and unique pectin slanted edge holes, resulting in excellent moisture absorption, breathability, anti-corrosion, antibacterial, low static and other characteristics, making linen fabric a fabric that can breathe naturally and known as the "fiber queen". At room temperature, wearing linen clothing can reduce the actual temperature of the human body by 4-5 degrees, hence linen is known as a "natural air conditioner". Because linen is a rare natural fiber, accounting for only 1.5% of natural fibers, linen products are relatively expensive and have become a symbol of status and status abroad. This standard specifies the public moisture regain, variety, specifications, identification, technical requirements, sampling and testing, acceptance rules, marking, packaging, transportation, and storage of flax (including oil fiber dual use flax) yarn products. This standard is applicable to the identification of the quality of wet spun long and short linen yarn (primary color yarn and bleached yarn) produced on ring spinning frames and serves as a unified regulation for handover acceptance. The following normative references are essential for the application of this document. For dated references, only the dated version applies to this document. For undated references, the latest version (including all modification orders) applies to this document. GB/T 250 Textiles - Evaluation of Color Fastness - Grey Sample Card for Discoloration - GB/T 3292.1 Textiles - Test Method for Uneven Yarn Yarns - Part 1: Capacitance Method - GB/T 3916- Determination of Breaking Strength and Elongation at Break of Single Yarn for Textiles and Wrapped Yarns (CRE Method) - GB/T 4743-2009- Textiles - Determination of Linear Density by Wrapped Yarn Method - GB/T 9995- Determination of Moisture Content and Moisture regain in Textile Materials - Oven Drying Method - FZ/T 01035- General System for Indicating Linear Density of Textiles (Tex system)

Function of testing report:

1. Project bidding: Issue authoritative third-party CMA/CNAS qualification report

2. Online e-commerce platform entry: Quality inspection report recognized by major e-commerce platforms

3. Used as a sales report: issuing legally effective testing reports to make consumers more confident

4. Papers and research: Provide professional personalized testing needs

5. Judicial services: providing scientific, fair, and accurate testing data

6. Industrial problem diagnosis: Verify the troubleshooting and correction of industrial production problems

100% inspection and testing process:

1. Telephone communication and confirmation of requirements

2. Recommend solutions and confirm quotations

3. Mail samples and arrange testing

4. Progress tracking and result feedback

5. Provide reports and after-sales service

6. If urgent or priority processing is required

Testing and testing characteristics:

1. The testing industry is fully covered, meeting different testing needs

2. Fully cover the laboratory and allocate localized testing nearby

3. Engineers provide one-on-one services to make testing more accurate

4. Free initial testing, with no testing fees charged

5. Self service order delivery for free on-site sampling

6. Short cycle, low cost, and attentive service

7. Possess authoritative qualifications such as CMA, CNAS, CAL, etc

8. The testing report is authoritative and effective, and is generally used in China