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GB/T 8949-2008: Polyurethane dry-processing artificial leather 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 8949: Historical versions
Similar standardsGB/T 8949-2008: Polyurethane dry-processing artificial leather---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/GBT8949-2008GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 59.080.40 Y 47 Replacing GB/T 8949-1995 Polyurethane dry-processing artificial leather Issued on. AUGUST 19, 2008 Implemented on. MAY 01, 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... 5 2 Normative references... 5 3 Product classification... 6 4 Requirements... 6 5 Test method... 8 6 Inspection rules... 14 7 Marking... 15 8 Packaging, transportation, storage... 16ForewordThis Standard replaces GB/T 8949-1995, Polyurethane dry-processing artificial leather. Compared with GB/T 8949-1995, the major changes of this Standard are. -- Change the product classification from “divide into classes A, B, and C according to the purpose” of the original standard to “divide into classes A and B according to the cloth base classification”; -- In 4.1.3 of this Standard, change the length of each roll and its limit deviation from “the length is generally 50 m/roll, and the limit deviation is +0.1 m” of the original standard to “the length is determined by negotiation between the supplier and the buyer, and the length cannot be a negative deviation”; -- In 4.1.4 of this Standard, determine different indicators according to the length of each roll; -- Cancel product quality gradation in this Standard; -- In this Standard, divide it into general physical and mechanical properties (4.3.1) AND negotiated physical and mechanical properties (4.3.2) according to the importance of physical and mechanical properties to products; -- In 5.2 of this Standard, change “cut more than 0.65 m along the warp direction of the product as the sample” of the original standard to “cut 0.8 m along the warp direction”; -- Add requirements for rubbing resistance, bursting strength, discoloration, and low-temperature flex resistance. This Standard replaces GB/T 8949-1995 from the date of implementation. 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. This Standard was drafted by Wuxi Double Elephant Micro Fibre Material Co., Ltd., with the participation of Foshan Plastics Group Co., Ltd. Shuanglong Branch and Zhejiang Hexin Ind Grp Co., Ltd. The drafters of this Standard. Gu Yuting, Tian Weikun, Zou Huizhong, Jin Mei, Zou Yonghua. The previous versions which are replaced by this Standard are. -- GB/T 8949-1988, GB/T 8949-1995. Polyurethane dry-processing artificial leather1 ScopeThis Standard specifies the product classification, requirements, test method, inspection rule and marking, packaging, transportation, and storage of polyurethane dry-processing artificial leather. This Standard is applicable to the polyurethane dry-processing artificial leather, of which knitted fabric base and woven fabric base are used as the base.2 Normative referencesThe terms in the following documents become the terms of this Standard by reference to this Standard. For dated references, all subsequent amendments (not including errata content) or revisions do not apply to this standard. However, parties to agreements that are based on this Standard are encouraged to study whether the latest versions of these documents can be used. For undated references, the latest edition applies to this Standard. GB/T 250-2008, Textiles - Tests for colour fastness - Grey scale for assessing change in colour GB/T 1040.1-2006, Plastics - Determination of tensile properties - Part 1. General principles GB/T 1040.3-2006, Plastics - Determination of Tensile Properties - Part 3. Test Conditions for Films and Sheets GB/T 1539-2007, Paperboard - Determination of bursting strength3 Product classificationProducts are classified by cloth base, as shown in Table 1.4 Requirements4.1 Specifications 4.1.1 Product thickness and its limit deviation It shall be in accordance with Table 2. 4.1.2 Product width and its limit deviation It shall be in accordance with Table 3. 4.1.3 Length of each roll and its limit deviation The length of each roll shall be determined by negotiation between the supplier and the buyer; it cannot be a negative deviation. 4.3 Physical and mechanical properties 4.3.1 General physical and mechanical properties The general physical and mechanical properties shall meet the requirements of Table 6. 4.3.2 Negotiated physical and mechanical properties Negotiated physical and mechanical properties refer to the physical and mechanical properties items that are agreed upon by the supplier and the buyer. The negotiated physical and mechanical properties shall meet the requirements of Table 7.5 Test method5.1 Sample state adjustment and test environment Perform it according to the standard environment, of which the temperature is 23 °C ± 2 °C, and the relative humidity is 50% ± 10%, and the general deviation range that are specified in GB/T 2918-1998; the sample state adjusting time is not less than 4 h; the test is carried out under this condition. 5.2 Sampling Cut more than 0.8 m along the warp direction of the product as a sample. Remove 50 mm on both sides in the width direction. The sample cut dimensions are shown in Table 8; the arrangement is shown in Figure 1. 5.3 Thickness 5.4 Width Use a steel tape or a meter whose accuracy is 1 mm to measure 3 points arbitrarily along the length direction. Take the minimum one as the result, accurate to 1 mm. 5.5 Length Use a suitable measuring tool or instrument to measure; the result is accurate to 1 cm. 5.6 Appearance Visually inspect under natural light. 5.7 Tensile load and elongation at break The tensile testing machine shall comply with the provisions of 5.1.2 ~ 5.1.5 in GB/T 1040.3-2006; 5.9 Peeling load 5.9.1 Instruments 5.9.1.1 The cupping machine shall be in accordance with the provisions of GB/T 1040.3. 5.9.1.2 Constant temperature oven with a blower device. 5.9.2 Test procedure Take 3 samples; use an appropriate amount of adhesive glue to paste the coating and the same leather coating together (the sample must be firmly bonded); then, place the bonded sample at 135 °C ± 5 °C; 5.9.3 Test result 5.9.3.1 Take the arithmetic average of each group of samples, accurate to 1 N; 5.10 Surface color fastness Perform it according to the provisions of GB/T 3920-2008; the standard lining fabric for friction shall meet the provisions of GB/T 7565-1987.The test results are evaluated according to GB/T 250-2008. 5.11 Anti-blocking 5.11.1 Instruments Constant temperature oven with a blower device. 5.15 Bursting strength 5.15.1 Test equipment The Mullen disruptive strength testing machine shall meet the requirements of GB/T 1539-2007. 5.15.2 Test procedure Place the coating surface of the sample down; use a ring fixture to clamp it; evenly press it until the sample is burst. The bursting strength is expressed by the pressure when the sample is burst. The test result is the arithmetic average of 3 samples, accurate to 0.1 MPa. 5.16 Discoloration6 Inspection rules6.1 Batch The products shall be checked and accepted in batches. Products of the same raw material, same specification and same process shall be one batch; the quantity of each batch shall not exceed 15 000 m. 6.2 Delivery inspection The factory inspection items are all items in 4.1, 4.2 and Table 6. 6.3 Type inspection The type inspection items are all items in 4.1, 4.2, Table 6, and Table 7. In any of the following cases, perform the type inspection. 6.4 Sampling For the inspection of specifications and appearance, adopt the one-time normal sampling plan, of which the general inspection level is I and the acceptance quality limit AQL is 6.5, that is specified in GB/T 2828.1-2003. 6.5 Judgment rules 6.5.1 Determination of qualified items Take roll as the sample unit for the specifications and appearance; respectively perform in accordance with the provisions of Table 2, Table 3, Table 4 and Table 5. 6.5.2 Determination of a qualified batch If all the inspection results are qualified, judge the batch of products to be qualified. If there is an unqualified item, judge the batch of products to be unqualified.7 MarkingThe package of each roll of products shall have the following markings.8 Packaging, transportation, storage8.1 Packaging Products are generally rolled into a neat round roll with a roll core and packaged in the plastic film or wrapping paper. 8.3 Storage Store the products in a clean, dry, ventilated warehouse of a suitable temperature; avoid extrusion; ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. 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