JC/T 2518-2019 in English
VALIDContinuously hot-dip zinc and zinc alloy coated steel sheet and strip
- Issued on:2019-05-02
- Implemented on:2019-11-01
- File Format:PDF
- Delivery:Via email within 5 business days
$136.00
本标准规定了疏水二氧化硅气凝胶粉体的术语和定义、产品分类与标记、技术要求、检验方法、检验规则、包装、标识、运输和贮存。
本标准适用于溶胶-凝胶法制备的疏水型二氧化硅气凝胶粉体，不适用于气相法或沉淀法制备的白炭黑。
Introduction
Standard Overview
JC/T 2518-2019 is my country's first building materials industry standard for hydrophobic silica aerogel powder, which was issued and implemented by the Ministry of Industry and Information Technology in 2019. The standard specifies the classification system, technical requirements and testing methods of the product, and is applicable to the production and quality control of aerogel materials used in building insulation, industrial insulation and other fields.
Interpretation of core parameters
| Classification indicators | SiO₂-SS-I type | SiO₂-SS-II type | SiO₂-SS-III type | SiO₂-SS-IV type |
|---|---|---|---|---|
| Tap density (g/cm³) | ≤0.050 | 0.051-0.100 | 0.101-0.200 | >0.200 |
| Specific surface area (m²/g) | ≥600 (Type I/II) ≥400 (Type III/IV) | |||
| SiO₂ content (%) | ≥85.0 | |||
Key technical requirements
1. Determination of tap density
Use the method specified in GB/T 21354. Note:
- Samples with particle size＞0.45mm need to be crushed and passed through a 40-mesh sieve
- Use an analytical balance with a range of 100g and an accuracy of 0.1mg
- Glass measuring cylinder specifications: 10cm³ volume/0.2cm³ graduation value
2. Specific surface area test
According to GB/T 19587 volumetric method execution, key points:
- BET method calculation pressure range: 0.04-0.30MPa
- Pore volume takes P/P₀=0.992-0.995 adsorption amount
- Parallel sample allowable deviation ≤5%
Implementation suggestions
Key points of quality control
Manufacturers should focus on:
- Purity control of raw silicon source (directly affects SiO₂ content)
- Hydrophobic modification process stability (determines mass moisture absorption rate ≤5%)
- Supercritical drying parameter optimization (affects pore size distribution)
Application scenario matching
Select applicable model according to standard classification:
- Type I: Aerospace grade insulation material (lowest tap density)
- Type III: Building insulation mortar additive
- Type IV: Industrial pipeline insulation filler
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