GB/T 2440-2017 PDF English
GB/T 2440: Historical versions
| Standard ID | USD | BUY PDF | Delivery | Standard Title (Description) | Status |
| GB/T 2440-2017 | 150 | Add to Cart | Auto, 9 seconds. | Urea | Valid |
| GB 2440-2001 | 70 | Add to Cart | Auto, 9 seconds. | [GB/T 2440-2001] Urea | Obsolete |
| GB 2440-1991 | RFQ | ASK | 3 days | Urea | Obsolete |
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GB/T 2440-2017: Urea
---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT2440-2017GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 65.080 G 21 Replacing GB/T 2440-2001 Urea Issued on. DECEMBER 29, 2017 Implemented on. JULY 01, 2018 Issued by. General Administration of Quality Supervision, Inspection and Quarantine; Standardization Administration of PRC.
Table of Contents
Foreword... 3 1 Scope... 4 2 Normative references... 4 3 Terms and definitions... 5 4 Requirements... 5 5 Test methods... 6 6 Inspection rules... 8 7 Marking... 10 8 Packaging, transportation and storage... 10 Appendix A (Informative) Calculation method of size guide number (SGN) and uniformity index (UI)... 12Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009. This standard replaces GB/T 2440-2001 “Urea”. As compared with GB/T 2440- 2001, the main technical changes are as follows. - RE-CLASSIFY the grades; - ADJUST the technical indicators such as total nitrogen, biuret, and so on; - MODIFY the total nitrogen from the dry basis to the wet basis; - ADD that for the agricultural (fertilizer) urea products, it shall be marked on the packaging container with a warning message “biuret contained”. This standard was proposed by the China Petroleum and Chemical Industry Federation. This standard shall be under the jurisdiction of the National Fertilizer and Soil Conditioning Standardization Technical Committee (SAC/TC 105). Drafting organizations of this standard. Shanghai Chemical Research Institute, Ruixing Group Co., Ltd., Jiangsu Huachang Chemical Co., Ltd., China National Petroleum Chemical Co., Ltd., Tianji Coal Chemical Group Co., Ltd. The main drafters of this standard. Shang Zhaocong, Meng Guangyin, Hu Bo, Fan Xiukai, Li Haofeng, Shen Bing, Ji Min, Yao Ye, Ma Aizhi, Xu Shiming. This standard replaces the standard previously issued as follows. - GB 2440-1981, GB 2440-1991, GB/T 2440-2001. Urea1 Scope
This standard specifies the terms and definitions, requirements, test methods, inspection rules, marking, packaging, transportation and storage of urea. This standard applies to agricultural (fertilizer) urea and industrial urea which are produced by the synthesis of ammonia and carbon dioxide. For the sulfur- coated urea, urea for AUS32, urea for raw materials with national standards or industry standards, it shall implement the corresponding standards. Note. Urea formula. CO(NH2)2. Relative molecular mass. 60.055 (according to the 2013 International Relative Atomic Mass Table).2 Normative references
The following documents are essential to the application of this document. For the dated documents, only the versions with the dates indicated are applicable to this document; for the undated documents, only the latest version (including all the amendments) are applicable to this standard. GB/T 2441.1 Determination of urea - Part 1.Total nitrogen content GB/T 2441.2 Determination of urea - Part 2.Biuret content - Spectrophotometric method GB/T 2441.3 Determination of urea - Part 3.Water content - Karl Fischer method GB/T 2441.4 Determination of urea - Part 4.Iron content - 1,10- Phenanthroline spectrophotometric method GB/T 2441.5 Determination of urea - Part 5.Alkalinity - Titrimetric method GB/T 2441.6 Determination of urea - Part 6.Water insoluble matter content - Weight method3 Terms and definitions
The following terms and definitions apply to this document. 3.1 Size guide number; SGN Average particle size of the materials between the two sieves according to the mass fraction more than 50%, which reflects the size of the dominant particle size. 3.2 Uniformity index; UI The uniformity index, which reflects the uniformity of the particle size. 3.3 Trace additive An additive which has a mass fraction of not more than 1.0% in the urea product.4 Requirements
4.1 Appearance. Granular or crystalline, without mechanical impurities. 4.2 Agricultural (fertilizer) urea shall meet the requirements of Table 1, meanwhile it shall also meet the indicated values.5 Test methods
5.1 Appearance It is determined by visual inspection. 5.2 Total nitrogen content It is determined according to the provisions of GB/T 2441.1, calculated according to formula (1). 5.3 Biuret content It is performed according to the provisions of GB/T 2441.2. 5.4 Moisture It is performed according to the provisions of GB/T 2441.3. 5.8 Water insoluble content It is performed according to the provisions of GB/T 2441.6. 5.9 Granularity It is performed according to the provisions of GB/T 2441.7.6 Inspection rules
6.1 Inspection categories and inspection items Product inspection includes exit-factory inspection and type inspection. The exit-factory inspection items include total nitrogen, biuret and moisture. The type inspection includes all items to be measured in the following cases. 6.2 Group-batch The products are inspected in batches, the production volume per shift or day is considered as a batch, the maximum batch size is 1500 t. 6.3 Sampling plan 6.3.1 Bagged products When the number of bags is less than 512, follow the Table 3 to determine the minimum number of sampling bags. When the number of bags is more than 512, use the formula (2) to calculate the minimum number of sampling bags. If there is a decimal number, it is rounded off to an integer. 6.5 Determination of results 6.5.1 The qualification judgment of the product’s quality indicators in this standard shall use the “comparative methods of rounding-off values” in GB/T 8170-2008. 6.5.3 When performing the exit-factory inspection, if one indicator of the inspection results does not meet the requirements of this standard, it shall retake the samples from double number of packaging bags for inspection. In the re-inspection results, even though there is one indicator failing to comply with this standard, this batch of products is judged to be disqualified.7 Marking
7.1 For the agricultural (fertilizer) urea, it shall be marked on the packaging container with the name and address (residence) of manufacturer, name of product, net content, grade, range of particle size (or SGN and UI), this standard number, other contents to be marked as required by laws and regulations. 7.3 For the industrial urea, it shall be marked on the packaging container with the name and address (residence) of manufacturer, name of product, batch number or date of manufacture, net product content, grade, this standard number, other contents to be marked as required by laws and regulations.8 Packaging, transportation and storage
8.1 Agricultural (fertilizer) urea products are packaged by the materials in accordance with the provisions of GB/T 8569, the packaging specifications are 50.0 kg, 40.0 kg, 25.0 kg, 10.0 kg. 8.2 When there are additives in the products within the specified net content range of each bag, they shall be mixed evenly with the original materials. It shall not place it in the package bag in the form of small packages. 8.3 According to the agreement between the supplier and the purchaser, the urea product can be in bulk or use the container bag (which shall meet the requirements of GB/T 10454) as a packaging container. 8.4 The transportation and handling tools of the product shall be clean, flat and free of sharp objects, to avoid piercing and scratching the package. 8.5 The product shall be stored in a warehouse that is flat, cool, ventilated and ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
