Scope

This standard specifies the terms and definitions, product identification, technical requirements, test methods, inspection rules and markings, as well as packaging, transportation, and storage requirements for polyacrylonitrile based carbon fiber large tow precursors This standard is applicable to polyacrylonitrile based carbon fiber large tow precursors with a single filament number ranging from 24 K to 50 K. Polyacrylonitrile based carbon fiber large tow precursor fibers with a thickness of over 50 K can be used as a reference Note: 1K is 1000 pieces The following documents 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 2828.1-2012 Sampling Procedures for Inspection by Attributes: Part 1: Sampling Plans for Batch Inspection Retrieved by Acceptance Quality Limit (AQL)

GB/T 3291.1 Textile and Textile Materials - Performance and Testing Terminology - Part 1; Fibers and Yarns

GB/T 3291.3 Textile Materials Performance and Testing Terminology Part 3: General

GB/T 4146 (All Parts) Spinning Products Chemical Fibers

GB/T 6503 Test Method for Moisture regain of Chemical Fibers

GB/T 6505-2017 Test Method for Thermal Shrinkage of Chemical Fibers Filament (After Treatment)

GB/T 8170-2008 Rules for rounding off numerical values and representation and determination of limit values

GB/T 14335-2008 Test Method for Dimensional Linear Density of Chemical Fiber Short Fibers

GB/T 14337-2008 Test Method for Tensile Properties of Chemical Fiber Short Fibers

GB/T 14343-2008 Test Method for Linear Density of Chemical Fiber Long Filaments

FZ/T 50032 Test Method for Residual Solvent in Polypropylene Based Carbon Fiber Raw Filaments

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