YBB 60102012 PDF EnglishUS$160.00 · In stock · Download in 9 seconds
YBB 60102012: Tests for Resistance to Attack of Glass by a Boiling Aqueous Solution of Mixed Alkali Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure
YBB6:---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/YBB6YBB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA Tests for Resistance to Attack of Glass by a Boiling Aqueous Solution of Mixed Alkali Tests for Resistance to Attack of Glass by a Boiling Aqueous Solution of Mixed Alkali This method is suitable for the determination and grading of the resistance to attack of various types of medicinal glass by boiling aqueous solution of mixed alkali. This method is to etch a glass sample with a total surface area of 10~15cm2 with an equal volume of boiling mixed solution of 0.5 mol/L sodium carbonate and 1 mol/L sodium hydroxide for 3 hours. Determine the mass loss per unit surface area of the glass test sample. Instruments Test container: made of sterling silver or alkali-resistant silver alloy or welded stainless steel (related components of welded stainless steel: 18%Cr, 10%Ni, 0.08%C and additional Ti). The container (shown in Figure 1) is a cylindrical silver cup with a hemispherical or flat base and a tightly fitting lid. The lid has a thick neck and a small mouth for inserting the thermometer, and is equipped with four hooks for hanging samples below. If necessary, a gasket of stable material can be added to ensure that the seam between the cup body and lid is sealed. Condenser: spherical or straight; length is 400 mm; made of chemically resistant glass. Gooch glass funnel: (shown in Figure 2) made of chemically resistant glass. The upper port is connected to the condenser with a plug. The lower tube of the funnel is connected to the neck of the container with a stopper. Stoppers shall be made of stable material. Boil it in water for 60 minutes beforehand. Heating bath: equipped with a controller that can heat glycerol and maintain a constant temperature at any temperature between 100~120°C, and is equipped with a stirring device. Place the test sample in a plastic beaker. Add hydrofluoric acid (40%) - 2mol/L hydrochloric acid (1:9) mixed solution to completely immerse it. Stir with a magnetic stirrer for 10 minutes. Use tweezers (the head is wrapped in plastic or platinum; use dilute hydrochloric acid before use; then wash with water) and take out the test sample. Wash, dry, cool and weigh as described above. Determination method Immerse the test container into the heating bath. Add 400 ml of 0.5 mol/L sodium carbonate solution and 400 ml of 1 mol/L sodium hydroxide solution into the test container to make the liquid level in the test container consistent with that of the bath solution. After covering with the lid, install the Gouch glass funnel and condenser. Turn on the condenser water flow. Start the stirrer and heat the bath. Allow the temperature in the test container to reach 102.5°C ± 0.5°C. The dripping speed of the reflux liquid shall be controlled to 4~6 seconds/drop. Then open the lid. Use silver wire to hang the test sample on the hook of the container lid. Immerse the test sample into the boiling solution (no collision between the test samples or between the test sample and the container wall) and boil continuously for 3 hours ± 2 minutes. Take out the test sample. Quickly soak three times in 1 mol/L hydrochloric acid solution. Wash three times with water. Finally rinse with acetone or absolute ethanol. Place in oven to dry at 110°C for 60 minutes. Transfer to a desiccator and cool to room temperature. Then weigh it accurately. Record its mass m2. Figure 2 -- Gooch glass funnel ...... 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 YBB 60102012 be delivered?Answer: The full copy PDF of English version of YBB 60102012 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 YBB 60102012_English with my colleagues?Answer: Yes. The purchased PDF of YBB 60102012_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 -- YBB 60102012 -- 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 YBB 60102012?A step-by-step guide to download PDF of YBB 60102012_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 "YBB 60102012". 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 |
