GB/T 8949-2008 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 8949-2008 | English | 160 |
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Polyurethane dry-processing artificial leather
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| GB/T 8949-1995 | English | 359 |
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Polyurethane dry-processing artificial leather
| Obsolete |
| GB 8949-1988 | English | RFQ |
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Polyurethane artificial leather
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GB/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/GBT8949-2008
GB
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 Contents
Foreword... 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... 16
Foreword
This 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 leather
1 Scope
This 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 references
The 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 strength
3 Product classification
Products are classified by cloth base, as shown in Table 1.
4 Requirements
4.1 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 method
5.1 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 Discoloration
6 Inspection rules
6.1 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 Marking
The package of each roll of products shall have the following markings.
8 Packaging, transportation, storage
8.1 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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