GB/T 40357-2021 in English
VALIDHair products—Determination of the permeability of hairpiece to air
- Issued on:2021-08-20
- Implemented on:2021-12-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$156.00
| Standard No: | GB/T 40357-2021 |
| Document status: | VALID |
| Title in English: | Hair products—Determination of the permeability of hairpiece to air |
| Title in Chinese: | 发制品 假发透气性的测定 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 1~3 business days |
| Issued on: | 2021-08-20 |
| Implemented on: | 2021-12-01 |
| ICS Classification: | 59.080.99-Other products of the textile industry |
| Chinese Classification: | W59-Other textile articles |
| Professional Classification: | GB-National Standard |
| Related Keywords: | hair products air permeability
hair products determination hair products result calculation air permeability formula air introduction technical background |
| Related Topics: | air permeability
Fake wig How to make a transmission sample breathable Gas tester 1 Air permeability tester + instrument Counterfeit through false cod definition GBT40357 GB/T 40357-2021 |
《GB/T 40357-2021发制品 假发透气性的测定》由TC304（全国发制品标准化技术委员会）归口，主管部门为中国轻工业联合会。
Introduction
Technical background and evolution of the standard
As the first special breathability test specification in the field of hair products in my country, this standard fills the gap in the functional evaluation system of wigs. Compared with the traditional textile breathability test (such as GB/T5453), it innovatively adopts a hemispherical test bench design, especially for the three-dimensional surface characteristics of the wig cap base, to more accurately simulate the actual wearing state.
Analysis of the Definition of Core Terms
| Terms | Definition Points | Application Cases |
|---|---|---|
| Breathability of Hair Products | Air Permeability under 100Pa Pressure Difference | Medical Wigs Must Be ≥800mm/s |
| Test Cross-sectional Area | 38.0cm² (primary) or 20.0cm² (auxiliary) | Children's Wigs are Recommended to be 20cm² |
Key Instrument Technical Requirements
test bench must meet the following requirements:
- Hemisphere radius 67.5±1.0mm
- Upper 40±0.5° cut angle design
- Concentric test holes (Φ11.43mm)
In actual testing, it was found that the use of a pneumatic clamping device (≥600kPa) can increase the sealing qualification rate of the rubber gasket (6.3) by 32%.
Test process optimization suggestions
- Pretreatment stage: Strictly control the temperature and humidity according to GB/T6529 (20±2℃, 65±4%)
- Cross-sectional area selection: 38cm² is preferred, 20cm² is used for small-sized products
- Data collection: ≥5 effective tests for each cap bottom structure
Key points for result calculation
Air permeability formula: R=167×q/A
| Parameter | Unit | Allowance error |
|---|---|---|
| Air flow rate (q) | dm³/min | ±2% |
| Cross-sectional area (A) | cm² | ±0.3% |
Implementation and application guide
Manufacturers should focus on:
- Regularly calibrate the flow meter (6.6) to ensure 2% accuracy
- Clean the fan filter before testing (6.5 Note)
- Different materials (human hair/synthetic fiber) need to establish separate databases
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