Knitted Fabric Testing

Knitted fabric is a textile material formed by inter‑looping yarn coils. It features excellent elasticity and air permeability, and is widely used in apparel, home textiles, medical supplies, sportswear and other fields. Testing services cover fiber composition analysis, physical‑property tests, color‑fastness evaluation, functional testing and eco‑safety index verification, ensuring compliance with national and industrial standards and delivering reliable quality references for manufacturers, traders and consumers.

Knitted fabric tests are performed in accordance with domestic and international standards including GB/T, ISO, AATCC and JIS, realizing full‑process quality control from raw yarn to finished fabric. Test reports can be applied for factory inspection, trade acceptance, quality‑dispute settlement and certification application.

Test Scope

1. Weft‑knitted fabric

2. Warp‑knitted fabric

3. Single jersey fabric

4. Rib knitted fabric

5. Double‑knit fabric

6. Piqué mesh fabric

7. Fleece sweatshirt fabric

8. Terry fabric

9. Velvet fabric

10. Polar fleece fabric

11. Roma fabric

12. Jacquard knitted fabric

13. Stretch knitted fabric

14. Functional knitted fabric

15. Polyester knitted fabric

16. Cotton knitted fabric

17. Nylon knitted fabric

18. Acrylic knitted fabric

19. Wool knitted fabric

20. Silk knitted fabric

21. Bamboo‑fiber knitted fabric

22. Modal knitted fabric

23. Polyester‑cotton blended knitted fabric

24. Nylon‑cotton blended knitted fabric

Test Items

1. Fiber Composition Content: Analyze percentage of each fiber component and verify consistency with marked composition.

2. Fabric Weight: Determine mass per unit area for evaluating fabric thickness and material cost.

3. Breaking Strength: Measure maximum tensile load and reflect fabric durability.

4. Tearing Strength: Evaluate resistance to tear propagation and service‑life performance.

5. Bursting Strength: Assess anti‑damage performance under vertical pressure load.

6. Pilling Resistance: Detect pilling degree caused by friction and evaluate surface appearance quality.

7. Dimensional Change Rate: Test shrinkage or elongation ratio after washing or dry‑cleaning.

8. Color Fastness to Washing: Assess color fading and staining degree during washing cycles.

9. Color Fastness to Rubbing: Measure color transfer caused by surface friction.

10. Color Fastness to Perspiration: Evaluate color retention under sweat‑simulated environment.

11. Color Fastness to Light: Detect fabric fading degree under light exposure.

12. Color Fastness to Chlorine Bleaching: Evaluate fabric resistance to chlorine‑bleach agents.

13. pH Value: Determine pH of fabric aqueous extract for skin‑contact safety assessment.

14. Formaldehyde Content: Detect residual free formaldehyde and control hazardous‑substance limits.

15. Decomposable Carcinogenic Aromatic Amine Dyes: Screen banned azo dyes for eco‑safety guarantee.

16. Heavy Metal Content: Detect residual lead, cadmium, chromium and other heavy‑metal elements.

17. Air Permeability: Measure air transmission capacity and wearing comfort performance.

18. Water Vapor Permeability: Evaluate water‑vapor transmission related to sweat‑wicking function.

19. Elastic Recovery Rate: Test fabric resilience after tensile deformation.

20. Tensile Elastic Elongation: Measure elongation ratio under specified load.

21. Seam Strength: Assess tensile resistance of fabric sewn joints.

22. Anti‑UV Performance: Test UPF value and ultraviolet transmittance.

23. Antibacterial Performance: Detect bacterial inhibition or sterilization effect of fabrics.

24. Moisture Absorption & Quick‑dry Performance: Evaluate water‑absorbing and drying speed.

25. Electrostatic Performance: Measure surface resistance and static‑charge half‑life period.

Applicable Standards

1. GB/T 2910, Textiles — Quantitative chemical analysis

2. GB/T 4669, Textiles — Determination of mass per unit length and mass per unit area of woven fabrics

3. GB/T 3923.1, Textiles — Tensile properties of fabrics — Part 1: Determination of breaking force

4. GB/T 3917.1, Textiles — Tearing properties of fabrics — Part 1: Determination of tear force

5. GB/T 19976, Textiles — Determination of bursting strength

6. GB/T 4802.1, Textiles — Determination of fabric pilling performance

7. GB/T 8628, Textiles — Preparation of fabric specimens and garments for dimensional‑change tests

8. GB/T 3921, Textiles — Color‑fastness test: Color fastness to soaping

9. GB/T 3920, Textiles — Color‑fastness test: Color fastness to rubbing

10. GB/T 3922, Textiles — Test method for color fastness to perspiration

11. GB/T 8427, Textiles — Color‑fastness test: Color fastness to artificial light

12. GB/T 7573, Textiles — Determination of pH value of aqueous extract

13. GB/T 2912.1, Textiles — Determination of formaldehyde‑Part 1: Free and hydrolysed formaldehyde

14. GB/T 17592, Textiles — Determination of banned azo dyes

15. GB/T 17593.1, Textiles — Determination of heavy‑metal content

Test Instruments

1. Electronic Textile Strength Tester

2. Martindale Abrasion Tester

3. Fabric Pilling Tester

4. Fabric Thickness Gauge

5. Electronic Analytical Balance

6. Color Fastness Tester

7. Light Fastness Tester

8. pH Meter

9. Spectrophotometer

10. Gas Chromatograph

11. Atomic Absorption Spectrometer

12. Air Permeability Tester

13. Water‑vapor Permeability Tester

14. Static‑electricity Tester

15. UV‑Protection Performance Tester

Notes

1. Knitted fabric samples shall avoid stretching during cutting; keep original relaxed status before conditioning to prevent deviation of dimensional‑change and elasticity test data.

2. Bursting strength and physical tensile tests shall select appropriate clamps for knitted loop‑structured fabrics to prevent sample slippage.

3. Elastic knitted fabrics need sufficient relaxation under standard temperature‑humidity environment before formal testing.

4. For color‑fastness testing, specimen laying direction shall conform to knitting loop direction requirements.

5. Functional indexes such as antibacterial, moisture‑absorption quick‑dry shall strictly follow sample pretreatment specified in standards.

6. Seam‑strength test specimens shall adopt actual sewing process consistent with finished‑product production.

Summary

Knitted fabric testing acts as a vital guarantee for product quality and safety. Systematic test items comprehensively evaluate physical properties, chemical safety and functional characteristics. Test data provides scientific reference for enterprises to optimize production procedures and control product quality, helps consumers identify qualified goods, and promotes sound development of the textile industry.