SN/T 5290-2021 in English
VALIDThe method of quantitative analysis for import and export feather &down and polyester fibers blended textile by using hypochlorite
- Issued on:2021-11-22
- Implemented on:2022-06-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$127.00
Introduction
Interpretation of the core technical aspects of the standard
This standard innovatively adopts a dissolution scheme that uses a constant temperature water bath shaker in conjunction with a stoppered Erlenmeyer flask to achieve selective dissolution of feather down using a 0.9-1.1 mol/L sodium hypochlorite solution at (20±2)℃. The key technical parameters include:
| Key links | Technical parameters | Quality control points |
|---|---|---|
| Sample preparation | Air blowing and mixing 1.5kW power | Visual observation of scattered and tumbling in the air |
| Dissolution reaction | 100mL/g sodium hypochlorite solution | Oscillation 40min±1min |
| Filtration accuracy | 90-150μm sand core crucible | Vacuum suction and drainage |
In-depth analysis of the method principle
Based on the specific solubility of feather protein fiber in alkaline hypochlorite, the polyester fiber maintains stable chemical properties. After dissolution, the component content is calculated by mass difference subtraction. Special attention should be paid to the following:
- Sodium hypochlorite concentration needs to be verified by iodine titration
- Residues need to be manually checked for hair stem impurities
- Parallel test tolerance ≤1%
Implementation points and common problems
Case: Inspection of a batch of exported down jackets
Blockage was found during filtration using a glass sand core funnel. Solution:
- Manually pick out the undissolved feather stems according to Clause 6.3.4
- Use a crucible with a pore diameter of 150μm
- Add a dilute acetic acid neutralization step (Clause 4.3)
Standard evolution and industry value
Compared with the traditional physical separation method, this chemical analysis method:
| Comparison dimension | This method | Traditional method |
|---|---|---|
| Accuracy | ±0.5% | ±2.0% |
| Detection cycle | 3 hours | 8 hours |
| Applicability | Mixed complex samples | Simple mixtures |
Supplementary instructions for operating specifications
According to Clause 7.2, when it is necessary to combine the official moisture regain:
- Polyester fiber is based on GB/T 9994
- Feather and down refer to Part 15 of IDFB Testing Procedure
- The final result is rounded to 1 decimal place
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