GB/T 2440-2017Urea (English PDF)

Foreword

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".

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

3 Terms and definitions

The following terms and definitions apply to this document.

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

6 Inspection rules

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 […]