BS ISO 18642:2016 pdf download – Fertilizer and soil conditioners — Fertilizer grade urea — General requirements 1 Scope This International Standard specifies the general requirements regarding testing methods, sampling and preparation of test sample, marking and labelling, package, transport, and storage of fertilizer grade urea. This International Standard is applicable to urea in solid form, e.g. granular, prilled, or pastilled, which is made by the reaction of ammonia with carbon dioxide. Urea can be classified by its intended use,industrial and/or agricultural. It is mainly used as fertilizer in the field of agriculture. This International Standard is only applicable to fertilizer grade urea in the field of agriculture. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 5315, Fertilizers — Determination of total nitrogen content — Titrimetric method after distillation ISO 7410, Fertilizers and soil conditioners — Final samples — Practical arrangements ISO 7742:1988, Solid fertilizers — Reduction of samples ISO 8397, Solid fertilizers and soil conditioners — Test sieving ISO 8633, Solid fertilizers — Simple sampling method for small lots ISO 18643, Fertilizers and soil conditioners — Determination of biuret content of urea-based fertilizers — PLC method EN 13466-1:2001, Fertilizers — Determination of water content — (Karl Fischer methods) — Part 1: Methanol as extracting medium 3Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 urea white crystalline, or granular, or prill, or pastill, solid synthesized from ammonia and carbon dioxide under high temperature and pressure by a number of processes Note 1 to entry: The molecular formula is CO(NH 2 ) 2 . The molecular weight is 60,053 according to IUPAC’s 2011 report on standard atomic weights. [SOURCE: ISO 8157:2015, 2.2.1.9, modified — In the definition, “or prill, or pastill,” has been added. Note 1 to entry has been added.] 4 Requirement 4.1 Appearance: The product shall be solid, such as in granular or prilled or pastill form, generally white in colour. 4.2 Fertilizer grade urea products shall be tested to demonstrate conformance with all the requirements specified in Table 1. 5 Testing methods 5.1 Appearance Visually inspect for the presence of contaminant and foreign matter. 5.2 Determination of total nitrogen contents Nitrogen contents...

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