SN/T 5165-2019 in English
VALIDInspection rules for import and export dangerous chemical products- Determination of Nitrocellulose wetting agent
- Issued on:2019-10-25
- Implemented on:2020-05-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$59.00
Introduction
Standard Background and Scope of Application
This standard is formulated to meet the quality control requirements of nitrocellulose, a high-risk chemical, in the import and export links, and focuses on regulating the determination method of the wetting agent content in nitrocellulose products with a nitrogen content of ≤12.6%. The content of wetting agent (including ethanol, isopropanol, etc.) directly affects the stability of nitrocellulose. The standard requires the wetting agent content to be ≥25% to ensure safe transportation and storage.
Analysis of core determination methods
| Key steps | Technical requirements | Safety control points |
|---|---|---|
| Sampling | Perform according to GB/T 3723 and GB/T 6679, seal and protect from light | Keep away from heat sources and prevent static electricity |
| Vacuum drying | 4 groups of optional conditions (40‚ÑÉ~80‚ÑÉ/-0.05~-0.1MPa) | Oven lock must be released |
| Constant weight determination | Difference between two weighings <0.003g | It is better to use explosion-proof oven |
Technological evolution and innovation
Compared with the traditional oven method, this standard introduces gradient vacuum drying technology:
- The temperature range is extended to 40-80‚ÑÉ to adapt to different types of wetting agents
- Vacuum degree graded control (-0.05MPa/-0.1MPa) balances efficiency and safety
- Innovative safety design: automatic release mechanism of oven lock
Implementation suggestions
Case: During the inspection at a certain port, it was found that the wetting agent content of a batch of nitrocellulose was only 18%, and the risk warning was immediately activated. According to Article 6.1 of the standard, the nitrogen content was supplemented and tested (the result was 11.9%), and it was determined to be unqualified.
Operational suggestions:
- Samples with unknown nitrogen content must be tested according to GJB 337 first
- Real-time monitoring of vacuum fluctuations during the drying process
- Waste samples must be immersed in water and professionally handled
Key points of quality control
Note for result calculation:
- Calculate the mass fraction according to the formula ùëä=(ùëö‚àí(ùëö2‚àíùëö1))/ùëö√ó100
- The allowable difference between parallel determinations is ≤0.5%
- The final result is rounded to three decimal places (GB/T 8170)
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