GB/T 21524-2008 PDF EnglishUS$115.00 · In stock · Download in 9 seconds
GB/T 21524-2008: Particle size determination of inorganic chemical products -- Sieving method Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid
Similar standardsGB/T 21524-2008: Particle size determination of inorganic chemical products -- Sieving method---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/GBT21524-2008GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 71.060.10 G 10 Particle size determination of inorganic chemical products - Sieving method (ISO 2926:1974, NEQ) ISSUED ON: APRIL 01, 2008 IMPLEMENTED ON: SEPTEMBER 01, 2008 Issued by: General Administration of Quality Supervision, Inspection and Quarantine; Standardization Administration of the People’s Republic of China. Table of ContentsForeword ... 3 1 Scope ... 4 2 Normative references ... 4 3 Terms and definitions ... 4 4 Principle of the method ... 5 5 Apparatus ... 5 6 Analysis procedure ... 6 7 Result calculation ... 7 Particle size determination of inorganic chemical products - Sieving method1 ScopeThis Standard specifies the methods for the determination of particle size in inorganic chemical products. This Standard is applicable to the determination of particle size in inorganic chemical products with a particle size larger than 45 μm and are non-hygroscopic or insoluble in water.2 Normative referencesThe following documents contain the provisions which, through reference in this Standard, become the provisions of this Standard. For dated references, their subsequent amendments (excluding corrigendum) or revisions do not apply to this Standard. However, the parties who enter into agreement based on this Standard are encouraged to investigate whether the latest versions of these documents are applicable. For undated reference documents, the latest versions apply to this Standard. GB/T 6003.1-1997 Test sieves of metal wire cloth (eqv ISO 3310.1:1990)3 Terms and definitionsFor the purpose of this Standard, the following terms and definitions apply. 3.1 hand sieving method A sieving method in which the test sieve is vibrated back and forth by hand, the test sieve is gently collided with the other hand at the amplitude distance, and the resulting vibration causes the particles smaller than the hole size to pass through the sieve holes. 3.2 mechanical sieving method A sieving method in which the test sieve is installed on a vibrating sieving machine, and the test sieve is vibrated by the vibrating machine.6 Analysis procedure6.1 Assemble the test sieves of the specified size in order to increase sieve holes from the bottom to the top. 6.2 Weigh 20.0 g ~ 50.0 g of sample with a balance, to the nearest 0.02 g. Put it on the test sieve at the top and close the top cover. 6.3 Determination 6.3.1 Hand sieving method Carry out the test through vibration by hand. The amplitude is about 0.1 m, the frequency is about 120 times/min, and the sieving duration is 3 min ~ 5 min. Let it stand for 3 min, and weigh the sieve residue of each sieve or under each sieve. The determination method is according to 6.4. 6.3.2 Mechanical sieving method Install the test sieve containing the sample on the vibrating sieving machine, of which the amplitude is 2 mm, the frequency is 120 times/min, and the vibration duration is 5 min. Let it stand for 3 min, and weigh the sieve residue. 6.3.3 Brush sieving method Put the sample on the test sieve, and brush repeatedly with a wool brush until there is no trace of the sample on the black backing paper. Let it stand for 3 min, and weigh the sieve residue. The determination method is according to 6.4. 6.3.4 Wet sieving method Put the sample on the test sieve, repeatedly rinse with water or immerse it in water, and brush repeatedly with a wool brush until the sample does not flow out in the rinse water. Let it stand for 3 min, place the test sieve in an electric oven at (105 ± 2) °C to dry until the mass is constant, and weigh the sieve residue to the nearest 0.0002 g. 6.4 The sieving process shall be continued until the mass fraction of the sample passing through the test sieve with the largest remaining particle size class within 1 min is less than 0.1 %. Carefully brush the sample left on each sieve and the bottom plate with a brush, and weigh the sieve residues (m1) of the test sieves of each particle size class, respectively. The difference between the sum of the amount of all sieve residues and the weighed sample amount shall not be greater than 1.5 %, otherwise, re-sample for determination. 6.5 After each determination, use ultrasonic to clean the whole set of sieves to ensure that the clogging of the test sieves is not greater than 1.0 %. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of English version of GB/T 21524-2008 be delivered?Answer: The full copy PDF of English version of GB/T 21524-2008 can be downloaded in 9 seconds, and it will also be emailed to you in 9 seconds (double mechanisms to ensure the delivery reliably), with PDF-invoice.Question 2: Can I share the purchased PDF of GB/T 21524-2008_English with my colleagues?Answer: Yes. The purchased PDF of GB/T 21524-2008_English will be deemed to be sold to your employer/organization who actually paid for it, including your colleagues and your employer's intranet.Question 3: Does the price include tax/VAT?Answer: Yes. Our tax invoice, downloaded/delivered in 9 seconds, includes all tax/VAT and complies with 100+ countries' tax regulations (tax exempted in 100+ countries) -- See Avoidance of Double Taxation Agreements (DTAs): List of DTAs signed between Singapore and 100+ countriesQuestion 4: Do you accept my currency other than USD?Answer: Yes. www.ChineseStandard.us -- GB/T 21524-2008 -- Click this link and select your country/currency to pay, the exact amount in your currency will be printed on the invoice. Full PDF will also be downloaded/emailed in 9 seconds.How to buy and download a true PDF of English version of GB/T 21524-2008?A step-by-step guide to download PDF of GB/T 21524-2008_EnglishStep 1: Visit website https://www.ChineseStandard.net (Pay in USD), or https://www.ChineseStandard.us (Pay in any currencies such as Euro, KRW, JPY, AUD).Step 2: Search keyword "GB/T 21524-2008". Step 3: Click "Add to Cart". If multiple PDFs are required, repeat steps 2 and 3 to add up to 12 PDFs to cart. Step 4: Select payment option (Via payment agents Stripe or PayPal). Step 5: Customize Tax Invoice -- Fill up your email etc. Step 6: Click "Checkout". Step 7: Make payment by credit card, PayPal, Google Pay etc. After the payment is completed and in 9 seconds, you will receive 2 emails attached with the purchased PDFs and PDF-invoice, respectively. Step 8: Optional -- Go to download PDF. Step 9: Optional -- Click Open/Download PDF to download PDFs and invoice. See screenshots for above steps: Steps 1~3 Steps 4~6 Step 7 Step 8 Step 9 |
