GB/T 3399-1982 PDF EnglishUS$179.00 · In stock · Download in 9 seconds
GB/T 3399-1982: Test method for thermal conductivity of plastics by means of the guarded hot plate Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure
GB/T 3399-1982: Test method for thermal conductivity of plastics by means of the guarded hot plate---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/GBT3399-1982 GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA UDC 678.5.536.2 GB 3399-1982 Test Method for Thermal Conductivity of Plastics by Means of the Guarded Hot Plate Issued on: DECEMBER 29, 1982 Implemented on: OCTOBER 1, 1983 Approved by. National Bureau of Standard Table of Contents1 Definitions... 3 2 Principle... 3 3 Specimen... 3 4 Test Conditions... 4 5 Test Instrument... 4 6 Test Procedure... 5 7 Test Results... 5 8 Test Report... 7 Additional Information... 7 Test Method for Thermal Conductivity of Plastics by Means of the Guarded Hot Plate This Standard applies to the steady-state measurement of thermal conductivity of plastics using the guarded heat plate method. It is not applicable to the measurement of plastics with a thermal conductivity greater than 2.20 W/(m·K).1 Definitions1.1 Heat flux Φ. The amount of heat passing through a surface per unit time, measured in W. 1.2 Heat flux density q. The amount of heat passing through a unit area of a surface per unit time, measured in W/m². 1.3 Thermal conductivity λ. The heat flux per unit area per unit temperature gradient perpendicular to the unit area under steady-state conditions, measured in W/(m·K).2 Principle2.1 This method is based on the principle of unidirectional stable heat conduction. When the upper and lower surfaces of the specimen are at different stable temperatures, the heat flux through the specimen's effective heat transfer area, as well as the temperature difference and thickness between the two surfaces, are measured to calculate the thermal conductivity.3 Specimen3.1 The specimen shall be a homogeneous hard material, with both surfaces smooth and parallel, free of cracks or other defects. For flat specimens, the unevenness is required to be within 0.5 mm/m. When testing soft materials or granular materials, a wooden frame is required, and the specimen shall be generally homogeneous. 3.2 The specimen shall be a representative portion of the product, either cut directly from the product or prepared according to the product standard. 3.2.1 For specimens measured by the double-plate thermal conductivity testers, they shall be as similar as possible. 3.3 The specimen shall be circular or square, with a diameter or side length equal to that of the guarded hot plate and a thickness of no less than 5 mm. The maximum thickness is determined by the instrument and shall not exceed 1/8 of its diameter or side length. 3.4 Before testing, the specimen shall be conditioned according to the product standard. If no product standard available, the specimen shall be conditioned for 24 h according to the conditions specified in GB 2918-1982 Plastics - Standard Atmospheres for Conditioning and Testing. 3.5 Each set of specimens shall consist of at least two specimens.4 Test Conditions4.1 Test Environment. It shall comply with the normal temperature and humidity requirements specified in GB 2918-1982. 4.2 Test conditions Hot plate temperature. Below 333 K. Cold plate temperature. Room temperature or the desired temperature. The temperature difference between the hot and cold plates shall be no less than 10 K, and the temperature gradient across the specimen shall be between 400 K/m and 2000 K/m. NOTE. If no anti-dew protection measures are in place, the cold plate temperature shall be at least 5 K above the ambient dew point.5 Test InstrumentThe instrument required by this method is a flat-plate thermal conductivity meter with a guarded hot plate. It consists of a hot plate (including a main hot plate and a guarded hot plate), a cold plate, a temperature measuring instrument, and a calorimeter. 5.1 Hot plate. The main hot plate shall have a diameter of at least 100 mm; and the minimum width of the guarded hot plate shall be at least 1/4 of the hot plate's side length or diameter. A suitable gap shall be provided between the main and guarded hot plates, with the flat area of the gap not exceeding 8% of the main hot plate's area. The hot plates shall be flat and smooth, with surface unevenness within 0.25 mm/m. Temperature shall be uniform, with temperature fluctuations on the main hot plate not exceeding 2% of the temperature difference between the two sides of the specimen; on the guarded hot plate, not exceeding 5%. An average temperature balance detector shall be located between the main and guarded hot plates. 5.2 Cold plate. It shall have the same dimensions and unevenness requirements as the hot plate. ......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 3399-1982 be delivered?Answer: The full copy PDF of English version of GB/T 3399-1982 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 3399-1982_English with my colleagues?Answer: Yes. The purchased PDF of GB/T 3399-1982_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 3399-1982 -- 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 3399-1982?A step-by-step guide to download PDF of GB/T 3399-1982_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 3399-1982". 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 |
