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GB/T 6669-2008: Flexible cellular polymeric materials -- Determination of compression set 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 6669: Historical versions
Similar standardsGB/T 6669-2008: Flexible cellular polymeric materials -- Determination of compression set---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/GBT6669-2008GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 83.080.01 G 31 GB/T 6669-2008 / ISO 1856:2000 Replacing GB/T 6669-2001 Flexible cellular polymeric materials - Determination of compression set (ISO 1856: 2000, IDT) ISSUED ON: AUGUST 19, 2008 IMPLEMENTED ON: MAY 1, 2009 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 Term and definition ... 4 4 Principle ... 5 5 Apparatus ... 5 6 Test pieces ... 5 7 Test procedure ... 6 8 Calculation and expression of results ... 7 9 Test report ... 8ForewordThis standard is identical to the international standard ISO 1856: 2000 Flexible cellular polymeric materials - Determination of compression set and its Amendment 1 (2007) in terms of the technical contents and text structures, except for a few editorial changes. This standard replaces GB/T 6669-2001 Polymeric material cellular flexible - Determination of compression set. The following main changes have been made with respect to GB/T 6669-2001: — The sentence “If samples show orientation of the cellular structure, the direction in which the compression is to be carried out shall be agreed between the supplier and the demander.” is deleted from 6.2; — The conditioning atmosphere “(20±2)℃ and (65±5)% relative humidity” is deleted from 6.4, while some contents are added to 6.4; — The requirements for the deviation of the compression level, compression time and recovery time are added; — The symbol “P” that represents the compression set in Formula (1) is replaced by "CS”; — The contents of test report are added; This standard was proposed by the China National Light Industry Council. This standard shall be under the jurisdiction of the National Technical Committee on Plastics of Standardization Administration of China. The main drafters of this standard: Ni Xiaodong, Sun Lin, Chen Qian, Zhou Xiaofang, Qian Hongxiang. The previous editions of this standard are as follows: — GB/T 6669-1986 and GB/T 6669-2001. Flexible cellular polymeric materials - Determination of compression set1 ScopeThis standard specifies three methods for determining the compression set of flexible cellular polymeric materials. This standard applies only to latex and polyurethane foams of thickness greater than 2mm.2 Normative referencesThe following normative documents contain provisions which, through reference in this text, constitute provisions of this standard. For dated references, subsequent amendments (excluding corrections), or revisions, of any of these publications do not apply to this standard. However parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition applies. GB/T 6342-1996 Cellular plastics and rubbers - Determination of linear dimensions (idt ISO 1923: 1981)3 Term and definitionFor the purpose of this standard, the following term and definition apply. 3.1 compression set the difference between the initial thickness and the final thickness of a test piece of the flexible cellular polymeric material after compression for a given time at a given temperature and after a given recovery time, the difference being referred to the initial thickness 6.3 Number of test pieces Five 25-mm-thick test pieces, or five assemblies in the case of thin materials, shall be tested. 6.4 Conditioning Materials shall not be tested less than 72 h after manufacture unless it can be demonstrated that the results obtained at either 16 h or 48 h after manufacture do not differ by more than ±10% from those obtained after 72h, in which case testing is permitted at 16h or 48h, respectively. Prior to the test, the test pieces shall be conditioned for at least 16h in one of the following atmospheres: (23±2)℃ and 50%±5% relative humidity; (27±2)℃ and 65%±5% relative humidity. This conditioning period may cover the final part of or, in the case of testing 16h after manufacture, the whole of the period following manufacture. In the case of quality-control tests, test pieces can be taken a shorter time (down to a minimum of 12 h) after manufacture and testing carried out after conditioning for a shorter period (down to a minimum of 6 h) in one of the atmospheres specified above.7 Test procedure7.1 General The test may be carried out by method A, method B or method C, or by all three. The three methods may, however, give different results. 7.2 Method A (compression at 70 °C) After the test piece has been conditioned as specified in 6.4, measure its initial thickness, d0, in accordance with GB/T 6342. In the case of thin materials, calculate the initial thickness d0 of the test piece by deducting the thickness of the glass slides from the total thickness of the assembly of glass slides and test pieces measured with the assembly in the horizontal position. Place the test piece or assembly between the plates of the compression device; compress it by either 50%±4% or 75%±4% of its thickness and maintain it under this condition. In special cases, a compression of 90% may be agreed upon. Chinese Standards This is an excerpt of the PDF (Some pages are marked off intentionally) Full-copy PDF can be purchased from 1 of 2 websites: 1. https://www.ChineseStandard.us SEARCH the standard ID, such as GB 4943.1-2022. Select your country (currency), for example: USA (USD); Germany (Euro). Full-copy of PDF (text-editable, true-PDF) can be downloaded in 9 seconds. Tax invoice can be downloaded in 9 seconds. Receiving emails in 9 seconds (with download links). SEARCH the standard ID, such as GB 4943.1-2022. Full-copy of PDF (text-editable, true-PDF) can be downloaded in 9 seconds. Receiving emails in 9 seconds (with PDFs attached, invoice and download links). Translated by: Field Test Asia Pte. Ltd. (Incorporated & taxed in Singapore. Tax ID: 201302277C) Linkin: https://www.linkedin.com/in/waynezhengwenrui/ ------ The End ------ ......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 6669-2008 be delivered?Answer: The full copy PDF of English version of GB/T 6669-2008 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 6669-2008_English with my colleagues?Answer: Yes. 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