GB/T 8813-2020 PDF EnglishUS$170.00 · In stock · Download in 9 seconds
GB/T 8813-2020: Rigid cellular plastics--Determination of compression properties Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid GB/T 8813: Historical versions
Similar standardsGB/T 8813-2020: Rigid cellular plastics--Determination of compression properties---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/GBT8813-2020GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 83.100 G 31 GB/T 8813-2020 / ISO 844:2014 Replacing GB/T 8813-2008 Rigid cellular plastics - Determination of compression properties (ISO 844:2014, IDT) ISSUED ON: JULY 21, 2020 IMPLEMENTED ON: FEBRUARY 01, 2021 Issued by: State Administration for Market Regulation; Standardization Administration of the People’s Republic of China. Table of ContentsForeword ... 3 1 Scope ... 5 2 Normative references ... 5 3 Terms and definitions ... 5 4 Symbols ... 6 5 Principle ... 7 6 Equipment ... 7 7 Sample ... 8 8 Test procedure ... 9 9 Result expression ... 10 10 Precision ... 13 11 Test report ... 13 References ... 15ForewordThis Standard was drafted in accordance with the rules given in GB/T 1.1-2009. This Standard replaces GB/T 8813-2008, “Rigid cellular plastics - Determination of compression properties”. Compared with GB/T 8813-2008, the major changes of this Standard are as follows: -- Modify the scope (see Chapter 1, Chapter 1 of version 2008); -- Modify symbols and abbreviations (see Chapter 4; Chapter 4 of version 2008); -- Modify the displacement measurement (see 6.2.1; 6.2.1 of version 2008); -- Modify the state adjustment (see 7.4; 7.4 of version 2008); -- Modify the test procedures (see Chapter 8; Chapter 8 of version 2008); -- Modify the overview (see 9.1; 9.1 of version 2008); -- Modify the units of compressive strength and compressive stress at 10% relative deformation (see 9.2.1, 9.3; 9.2.1, 9.3 of version 2008); -- Modify the compressive modulus of elasticity (see 9.4; 9.4 of version 2008); -- Modify the test report (see Chapter 11, Chapter 11 of version 2008); This Standard uses the translation method that is equivalent to ISO 844:2014, “Rigid cellular plastics - Determination of compression properties”. The documents of our country that have a consistent correspondence with the international documents that are referenced in this Standard are as follows: -- GB/T 6342-1996, Cellular plastics and rubbers - Determination of linear dimensions (ISO 1923:1981, IDT). This Standard was proposed by China National Light Industry Council. This Standard shall be under the jurisdiction of National Technical Committee 48 on Plastic Products of Standardization Administration of China (SAC/TC 48). The drafting organizations of this Standard: Light Industry Plastics Processing Application Research Institute, Hebei Wuzhou Kaiyuan Environmental Protection New Material Co., Ltd., Wuhan Industrial Control Inspection and Testing Co., Ltd., Shanghai Pugong Testing Technology Co., Ltd., China National Centre for Quality Supervision & Test of Plastic Products (Beijing). Rigid cellular plastics - Determination of compression properties1 ScopeThis Standard specifies methods for determining the following parameters: a) Compressive strength and relative deformation; or b) Compressive stress at 10% relative deformation; and c) Compression modulus of rigid cellular plastics, if needed. There are two methods: -- Method A uses beam displacement to determine compression properties. When it is necessary to determine the compressive stress at 10% relative deformation, use Method A. -- Method B uses a strain measurement device (contact extensometer) or a similar device that is fixed on the sample to directly measure the deformation of the sample. When it is necessary to determine the compression modulus, use Method B. Note: Both method A and method B can determine the compressive strength (at maximum load).2 Normative referencesThe following documents are indispensable for the application of this document. For dated references, only the dated version applies to this document. For undated references, the latest edition (including all amendments) applies to this document. ISO 1923, Cellular plastics and rubbers - Determination of linear dimensions3 Terms and definitionsThe following terms and definitions are applicable to this document. 3.1 Relative deformation σm: compressive strength, MPa. σ10: compressive stress at 10% relative deformation, MPa. xe: displacement corresponding to the compressive force Fe within the proportional limit, mm. xm: displacement corresponding to the maximum compressive force Fm when the relative deformation ε< 10%, mm. x10: displacement when the relative deformation is 10%, mm.5 PrincipleApply a vertical compressive force to the surface of the sample, so as to calculate the maximum stress that the sample bears. If the relative deformation corresponding to the maximum stress is less than 10%, call it “compressive strength”. If the relative deformation corresponding to the maximum stress reaches or exceeds 10%, take the compressive stress at 10% relative deformation as the test result, which is called “compressive stress at 10% relative deformation”.6 Equipment6.1 Compression testing machine The range of force and displacement of the used compression testing machine shall meet the requirements of this Standard. Two square or round parallel plates with polished surface and no deformation are required. The side length (or diameter) of the plate is at least 100 mm and larger than the pressure surface of the sample; one of them is fixed and the other can be moved at a constant rate according to the conditions that are specified in Chapter 8. The two plates shall always be kept level. 6.2 Displacement and force measurement device 6.2.1 Measurement of displacement Method A -- The compression testing machine shall be equipped with a device that can continuously measure the displacement x of the moving plate; the accuracy is ±5% or ±0.1 mm; if the latter is more accurate, select the latter (see the second paragraph of 6.2.2). It is not allowed to stack several samples for testing. The results that are measured on samples of different geometries and thicknesses are not comparable. 7.2 Preparation When preparing the sample, its pressure surface shall be perpendicular to the direction in which the product is stressed. To understand the complete characteristics of anisotropic materials, or to know the main direction of anisotropic materials, prepare multiple sets of samples. In general, the characteristics of anisotropic body are represented by a plane and its orthogonal plane; so, two sets of samples are considered. The preparation of sample shall not change the structure of the foam material. If the product does not retain the molded skin during use, the skin shall be removed. 7.3 Quantity When taking samples from block materials or thick plates of rigid cellular plastic products, refer to the provisions in the relevant foam plastic product standards for the sampling method and quantity. In the absence of relevant regulations, take at least 5 samples. 7.4 State adjustment According to one of the following conditions, adjust for at least 6 h: a) Temperature of (23±2) °C, relative humidity of (50±10) %; b) Temperature of (23±5) °C, relative humidity of 50+20 -10 %; c) Temperature of (27±5) °C, relative humidity of 65+20 -10 %.8 Test procedureThe test condition shall be the same as the condition of the sample state adjustment. According to the provisions of ISO 1923, measure the three-dimensional size of each sample. Place the sample in the center between the two parallel plates of the compression testing machine; compress the sample at a rate of 10% of the initial thickness of the sample per minute as much as possible, until the compressive strength σm and/or the compressive stress at 10% relative deformation σ10 are measured. ......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 8813-2020 be delivered?Answer: The full copy PDF of English version of GB/T 8813-2020 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 8813-2020_English with my colleagues?Answer: Yes. The purchased PDF of GB/T 8813-2020_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 8813-2020 -- 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.Question 5: Should I purchase the latest version GB/T 8813-2020?Answer: Yes. Unless special scenarios such as technical constraints or academic study, you should always prioritize to purchase the latest version GB/T 8813-2020 even if the enforcement date is in future. Complying with the latest version means that, by default, it also complies with all the earlier versions, technically.How to buy and download a true PDF of English version of GB/T 8813-2020?A step-by-step guide to download PDF of GB/T 8813-2020_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 8813-2020". 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 |
