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GB/T 2440-2017 PDF in English


GB/T 2440-2017 (GB/T2440-2017, GBT 2440-2017, GBT2440-2017)
Standard IDContents [version]USDSTEP2[PDF] delivered inName of Chinese StandardStatus
GB/T 2440-2017English150 Add to Cart 0-9 seconds. Auto-delivery. Urea Valid
GB 2440-2001English70 Add to Cart 0-9 seconds. Auto-delivery. [GB/T 2440-2001] Urea Obsolete
GB 2440-1991EnglishRFQ ASK 3 days Urea Obsolete
Standards related to (historical): GB/T 2440-2017
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GB/T 2440-2017: PDF in English (GBT 2440-2017)

GB/T 2440-2017 GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 65.080 G 21 Replacing GB/T 2440-2001 Urea 尿素 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) ... 12  Urea 1 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 method GB/T 2441.7 Determination of urea - Part 7. Particle size - Sieve method GB/T 2441.8 Determination of urea - Part 8. Sulphate content - Visible turbidimetric method GB/T 2441.9 Determination of urea - Part 9. Methylenediurea content - Spectrophotometric method GB/T 6679 General rules for sampling solid chemical products GB/T 8170-2008 Rules of rounding off for numerical values & expression and judgement of limiting values GB/T 8569 Packing of solid chemical fertilizers GB/T 10454 Flexible freight container GB 18382 Fertilizer marking - Presentation and declaration HG/T 4365-2012 Water soluble fertilizer 3 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. requirements of this standard, the batch of products is judged to be qualified. 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. 6.5.4 Each batch of qualified exit-factory products shall be accompanied by a quality certificate, which includes. name and address (residence) of manufacturer, name of product, batch number or date of manufacture, net product content, total nitrogen content, biuret content, this standard number, other contents to be marked as required by laws and regulations. For agricultural (fertilizer) urea which has trace additives and industrial urea which has formaldehyde and other additives, it shall indicate the composition of additive in the quality certificate. 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. The net content of each bag shall be marked with a single value, such as 50 kg. The rest executes GB 18382. 7.2 For agricultural (fertilizer) urea products, it shall be marked on the packaging container with the following warning. “Biuret-containing urea, improper use can cause damage to crops”. 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. 7.4 For bulk products and products with container bags as packaging containers, if the attached quality certificate has already indicated all the marking contents, it may follow the requirements of the agreement to simplify the marking contents. 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. The allowable range of net content per bag Appendix A (Informative) Calculation method of size guide number (SGN) and uniformity index (UI) SGN is the abbreviation of SIZE GUIDE NUMBER, which is the size guide number. It refers to the average particle size of the material between the two sieves based on the mass fraction more than 50%. It reflects the size of the size guide number. The SGN value of different raw materials is generally 280 ~ 340, the closer it is, the more suitable it is to match. UI is the abbreviation of UNIFORMITY INDEX, which is the uniformity index, which reflects the uniformity of particle size. The larger the value, the better the uniformity. It is acceptable when it is at least exceeding 40. When mixing different materials, the difference in UI value shall not exceed 15%. When selecting raw materials, SGN values and UI values shall be fully considered, all raw materials shall be closer in both aspects. If necessary, use the sieving pretreatment for selection. The calculation method of SGN is to weigh a certain mass of raw material sample for sieving, weigh it separately, calculate the ratio of the mass of the material above-sieve to the total amount of the sample as well as the difference between the pore sizes of the two adjacent sieves, make calculation according to the pore size of the two sieves on which more than 50% materials above- sieve is located as well as the proportion of the materials above-sieve. SGN = Inter-sieve pore-size difference x 100 x [(Proportion of small-pore-size material above-sieve - 50)/(Proportion of small-pore-size material above-sieve - proportion of large-pore-size material above-sieve)] + small-pore-size x 100 Example of calculation method of SGN value. Taylor sieve system mesh +4 +5 +6 +7 +8 +9 +10 +12 +14 +16 -16 Standard sieve system mm 4.75 4.00 3.35 2.80 2.36 2.00 1.70 1.40 1.18 1.00 under-sieve Inter-sieve pore-size difference 0.75 0.65 0.55 0.44 0.36 0.30 0.30 0.22 0.18 - Proportion of material above-sieve, % 0 3.5 25.3 71.0 94.2 98.4 99.7 99.91 99.95 99.96 0.04 Calculation of SGN. ......
 
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.