Inspection and Factory Quality Audit | Jacket Inspection Standards and Methods

1. Appearance quality inspection standards

1. Sewing process requirements

• Suture quality:

  • Stitch density: 12-14 stitches/3cm (flat stitch)

  • Seam width: 1.0-1.2cm (key parts)

  • Thread end treatment: Exposed thread end ≤ 0.5cm

• Symmetrical tolerance:

  • Sleeve length deviation ≤ 0.6cm

  • The difference in trouser leg length is ≤0.8cm

  • Pocket position deviation ≤ 0.5cm

2. Surface defect grading

• Minor defects (acceptable):

  • Stain area ≤1.0cm² (fabric)

  • Dead fold length ≤ 3cm

  • Stitch skew ≤ 0.3cm/20cm

• Serious defects (requires repair):

  • Glue penetration area ≥ 2cm²

  • Degumming length ≥1cm

  • ≥3 exposed needle holes on the fabric

• Fatal defects (rejection):

  • Lack of waterproof structure

  • Zipper malfunction

  • Fabric inconsistency in the forward direction

3. Color difference inspection standards

• Color card comparison:

  • Main body fabric ≥ Grade 4 (GB/T 250)

  • Seams ≥ Level 3-4

  • Color difference of the set ≥3-4 levels

• Special requirements:

  • Color difference of waterproof pressure glue strip ≥4 levels

  • Color change after washing ≤0.5 level

2. Functional testing standards

1. Waterproof performance test

• Surface moisture resistance:

  • Initial value ≥ Grade 4 (AATCC 22)

  • After washing 5 times ≥ level 3

• Hydrostatic pressure:

  • Initial ≥10000mmH₂O (ISO 811)

  • After washing 5 times ≥8000mmH₂O

2. Air permeability test

• Moisture permeability:

  • ≥10000g/m²/24h（JIS L1099）

  • Retention rate after washing ≥80%

3. Durability testing

• Wear resistance:

  • ≥10,000 times (Martindale)

  • No noticeable wear (ASTM D4966)

• Seam strength:

  • ≥100N (ISO 13935-2)

  • Crotch ≥ 150N

3. Safety and environmental protection testing

1. Chemical Substance Restrictions

• Hazardous substances:

  • Formaldehyde ≤75mg/kg (GB 18401)

  • PFOS/PFOA≤1μg/m²

  • No carcinogenic dyes were detected

• pH range:

  • 4.0-7.5 (direct contact with skin)

2. Attachment Security

• Zipper test:

  • Reciprocating test ≥500 times

  • Tensile strength ≥200N

• Button fastness:

  • Tensile force ≥70N (EN 14372)

  • Sharp edge detection (R ≥ 0.5mm)

4. Dimensional stability test

1. Dimensional changes after washing

• Machine wash test:

  • Temperature 40℃×5 times

  • Clothing length change ≤±2%

  • Chest circumference change ≤ ±1.5%

2. Dry cleaning stability

• Tetrachloroethylene dry cleaning:

  • After 3 cycles

  • Dimensional change ≤±1.5%

V. Special inspection items

1. Metal residue detection

• Needle detector test:

  • Sensitivity Φ0.8mm steel ball

  • Full scan without alarm

2. Appearance after washing

• Washing program:

  • Standard 40℃ washing

  • Drying temperature 60℃

  • Assessment items:

    • Integrity of the sealing strip

    • Fabric pilling (≤ level 3)

    • Accessory color change

3. Color fastness test

• Test items and standards:

  • Friction: dry ≥ level 4, wet ≥ level 3

  • Sweat stains: ≥ level 3-4

  • Water stains: ≥ Level 4

  • Light: ≥ Level 4 (40 hours)

VI. Inspection Implementation Specifications

1. Inspection conditions

• Environmental requirements:

  • Light ≥ 1000 lux

  • Inspection table height 80cm

  • Color temperature 6500K

2. Sampling plan

• AQL Standards:

  • Fatal flaw: 0 take and 1 return

  • Major flaws: 1.5

  • Minor flaws: 4.0

3. Measurement method

• Key dimension measurement points:

  • Length: From neck point to hem

  • Chest: 2cm below the armpit

  • Sleeve length: shoulder point to cuff

This specification applies to the quality inspection of all types of outdoor functional clothing. Special inspection requirements should be supplemented for special designs. Manufacturers are advised to establish a digital inspection system to enable real-time upload of inspection data and quality traceability. Exported products must also comply with relevant standards such as EU EN 343 and US ASTM F2732.