1 Scope
This standard specifies the requirements, test methods, inspection rules, marking and labeling, as well as packaging, transportation and storage of silica gel type A.
This standard is applicable to narrow pore lump silica gel and narrow pore ball silica gel, which are made from sulfuric acid and sodium silicate. The above-mentioned products are collectively referred to as silica gel type A. The narrow pore silica gel is mainly used as a gas purifying agent, a desiccant, an air humidity regulator and a catalyst carrier, and is used for refining and separating petrochemical products and dehydrating and refining organic products.
Molecular formula: SiO2?nH2O
2 Normative References
The following normative documents contain provisions which, through reference in this standard, constitute provisions of this standard. For dated references, subsequent amendments (excluding corrections) to, or revisions, of any of these publications do not apply. However, parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of these references indicated below. For undated references, the latest edition applies.
GB/T 191-2000 Packaging - Pictorial Marking for Handling of Goods
(eqv ISO 780: 1997)
GB/T 1250 Rules of Rounding Off for Numerical Values & Expression and Judgment of Limiting Values
GB/T 6678 General Principles for Sampling Chemical Products
HG/T 2765.5-2005 Test Method for Silica Gel
3 Classification
Foreword i
1 Scope
2 Normative References
3 Classification
4 Requirements
5 Test Methods
6 Inspection Rules
7 Marking and Labeling
8 Packaging, Transportation and Storage
Annex A (Informative) Technical Deviations between This Standard and the Japanese standard JIS Z 0701-1977 (1992) Silicagel Desiccants for Packaging (Category 1, Type A) and Their Causes
Annex B (Informative) Structural Deviations between This Standard and the Japanese standard JIS Z 0701-1977 (1992) Silicagel Desiccants for Packaging (Category 1, Type A)
