EN 15928:2010 – Fertilizers – Determination of the fineness of grinding
1 Scope
This European Standard specifies the dry procedure for the determination of the fineness of grinding, which is applicable to all EC type fertilizers in which requirements are given of fineness of grinding using 0,630 mm and 0,160 mm.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
EN 1482-2, Fertilizers and liming materials — Sampling and sample preparation — Part 2: Sample preparation
EN 12944-1:1999, Fertilizers and liming materials and soil improvers — Vocabulary — Part 1: General terms
EN 12944-2:1999, Fertilizers and liming materials and soil improvers — Vocabulary — Part 2: Terms relating to fertilizers
ISO 3310-1, Test sieves ― Technical requirements and testing ― Part 1: Test sieves of metal wire cloth
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 12944-1:1999 and EN 12944-2:1999 apply.
4 Principle
By mechanical sieve shaking, the quantities of product with a granule size greater than 0,630 mm and those with a granule size between 0,160 mm and 0,630 mm are determined, and the percentage of fineness of grinding is calculated.
5 Apparatus
5.1 Mechanical sieve shaker.
5.2 Sieves, with aperture sizes of 0,160 mm and 0,630 mm respectively of standard ranges (200 mm diameter and 50 mm high).
For technical requirements and testing of sieves of metal wire cloth see ISO 3310-1.
6 Sampling and sample preparation
Sampling is not part of the method specified in this document. A recommended sampling method is given in EN 1482-1.
Sample preparation shall be carried out in accordance with EN 1482-2.
7 Procedure Weigh, to the nearest 0,05 g, approximately 50 g of the test sample. Assemble the two sieves and the collecting container on the shaker (5.1), the sieve with the larger apertures being placed on top. Place the test portion on the top. Sieve for 10 min and remove the part collected on the bottom. Start the apparatus up again and after one minute check that the amount collected on the bottom during this time is not more than 250 mg. Repeat the process (for 1 min each time) until the amount collected is less than 250 mg. Weigh the residual material on both sieves separately.
EN 15928:2010 – Fertilizers – Determination of the fineness of grinding