GB/T 34709-2017 in English
VALIDGeneral test method for silica gel
- Issued on:2017-11-01
- Implemented on:2018-05-01
- File Format:PDF
- Delivery:Via email within 5 business days
Price(USD)：
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$156.00
$156.00
| Standard No: | GB/T 34709-2017 |
| Document status: | VALID |
| Title in English: | General test method for silica gel |
| Title in Chinese: | 硅胶通用试验方法 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 5 business days |
| Issued on: | 2017-11-01 |
| Implemented on: | 2018-05-01 |
| ICS Classification: | 71.060.01-Inorganic chemicals in general |
| Chinese Classification: | G10-Inorganic chemicals in general |
| Professional Classification: | GB-National Standard |
| Related Topics: | Silica gel
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《GB/T 34709-2017硅胶通用试验方法》由TC63（全国化学标准化技术委员会）归口，TC63SC1（全国化学标准化技术委员会无机化工分会）执行，主管部门为中国石油和化学工业联合会。
Introduction
Analysis of the core content of the standard
| Test items | nMethod principle | Key instruments | Accuracy requirements |
|---|---|---|---|
| Particle size determination | Laser scattering method | Laser particle size analyzer | D50 report value |
| Adsorption amount | Static/dynamic adsorption equilibrium | Constant temperature dryer | ±1.0% |
| Specific surface area | BET nitrogen adsorption method | Specific surface porosimeter | ±0.02mL/g |
Key technical points
1. Particle size analysis system
The standard adopts a dual-track detection scheme:
- Laser scattering method: Applicable to the range of 0.1-3000μm, the shading degree needs to be controlled at 10-20%
- Sieving method: There are two sieves: metal wire mesh (block silica gel) and perforated plate (spherical silica gel)
Application case: Microsphere silica gel detection must first be subjected to ultrasonic dispersion (power>100W) for 3 minutes, and the silica refractive index parameter of 1.46 is selected for calibration.
2. Adsorption performance test
Establish a three-level humidity control system:
- The static method uses a sulfuric acid solution gradient (20%-90%RH)
- The dynamic method needs to control the air flow rate to 2-2.5L/min
- Color identification requires a standard chromatogram
Standard evolution analysis
Main upgrades compared to the old standard:
- Added guided spouted bed abrasion rate determination method (specially for microsphere silica gel)
- Introduced a rapid moisture meter to replace the traditional oven method
- Refine the CO₂ adsorption determination operating procedures
Implementation suggestions
Laboratory configuration plan:
| Basic level | Screening set + constant temperature drying oven + analytical balance |
| Professional level | Laser particle size analyzer+BET specific surface area analyzer+dynamic adsorption device |
Notes: The determination of iron content must be strictly carried out in accordance with GB/T 3049-2006, and the blank test must be carried out simultaneously
Sample only — not a preview of GB/T 34709-2017
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