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GB/T 16578.1-2008 English PDF (GBT16578.1-2008)

GB/T 16578.1-2008 English PDF (GBT16578.1-2008)

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GB/T 16578.1-2008: Plastics -- Film and sheeting -- Determination of tear resistance -- Part 1: Trouser tear method

GB/T 16578.1-2008
Plastics.Film and sheeting.Determination of tear resistance.Part 1.Trouser tear method ICS 83.140.10
G31
National Standards of People's Republic of China
GB/T 16577.1-2008/ISO 6383-1.1983
Replace GB/T 16578-1996
Determination of tear resistance of plastic films and sheets
Part 1.Pants-shaped tearing method
(ISO 6383-1.1983, IDT)
2008-08-04 released
2009-04-01 implementation
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China Issued by China National Standardization Management Committee
Foreword
GB/T 16578 "Determination of tear resistance of plastic films and sheets" is divided into 2 parts. --- Part 1.Trouser-shaped tearing method;
--- Part 2.The Elmendorf Method (Elmendorfmeth).
This part is part 1 of GB/T 16578, which is equivalent to ISO 6383-1.1983 "Plastics-Films and sheets-tear resistance Determination of performance. Part 1.Trouser tearing method (English version). This part is equivalent to the translation of ISO 6383-1.1983, which is completely consistent in technical content. For ease of use, the following editorial changes have been made to this standard. --- Change "this part of ISO 6383" to "this part of GB/T 16578";
--- Deleted the preface of ISO 6383-1.1983;
--- Added the foreword of national standards;
--- Replace the international standards listed in the "normative references" chapter with the national standards equivalent to the documents; --- Replace the ISO standard involved in the standard with the corresponding national standard. This part replaces GB/T 16578-1996 "Test method for tear resistance of plastic films and sheets". Compared with GB/T 16578-1996, the main changes in this part are.
--- Changed the standard name and added a preface;
--- Added normative references;
--- The definition content is different, the definition of maximum tearing force has been deleted; --- Delete the original 6.3 (tool);
--- Delete the original figure 2 sample cutting method;
--- Increased the test speed of 250mm/min;
--- Increased tear expansion pattern;
--- Delete the load-time diagram of the original 11.2 and Figure 5 highly stretched film; --- Delete the 11.5 standard deviation calculation formula.
This part is proposed by China Petroleum and Chemical Industry Association. This part is under the jurisdiction of the National Plastic Standardization Technical Committee (SAC/TC15). This section is responsible for drafting unit. National Synthetic Resin Quality Supervision and Inspection Center. Participated in the drafting of this part. Beijing Yanshan Petrochemical Resin Institute, National Chemical Building Materials Testing Center (Material Testing Department), National Petrochemical Organic Raw Material Synthetic Resin Quality Inspection Center, National Plastic Quality Inspection Center (Beijing), Guangzhou Jinfa Technology Co., Ltd. The main drafters of this section. Shi Yafang, Huang Zhengan, Chen Hongyuan, Li Jianjun, Wang Chaoxian, Song Chao, Jin Wei. The release of previous versions of the standard replaced by this part are. --- GB/T 16578-1996.
GB/T 16577.1-2008/ISO 6383-1.1983
Determination of tear resistance of plastic films and sheets
Part 1.Pants-shaped tearing method
1 Scope
This part of GB/T 16578 specifies the use of standard pant-shaped samples to measure the tearing properties of films and sheets with a thickness of less than 1 mm method. The test shall be carried out under the prescribed state adjustment and test speed. This section applies to films and sheets of soft and hard materials. The material should not be brittlely damaged or irreversibly deformed during the test. The energy consumed by the deformation of the two trouser legs should not affect the energy consumed by the tear. This section does not apply to the determination of the tear properties of foam sheets and foam films. 2 Normative references
The clauses in the following documents become the clauses of this part by quoting GB/T 16578 in this part. For dated references, their All subsequent amendments (not including errata content) or revisions do not apply to this section, however, encourage each agreement reached in accordance with this section Fang studies whether the latest version of these documents can be used. For the cited documents without date, the latest version applies to this section. GB/T 2918-1998 Standard environment for plastic sample condition adjustment and testing (idt ISO 291..1997) GB/T 6672-2001 Plastic film and sheet thickness determination mechanical measurement method (idt ISO 4593..1993) GB/T 104.3-2006 Test method for tensile properties of plastic films (ISO 527-3..1995, IDT) GB/T 20220-2006 Determination of the average thickness of plastic film and sheet samples, the average thickness of the roll and the weight per unit area Method (Weighing Thickness) (ISO 4591..1992, IDT)
3 Terms and definitions
The following terms and definitions apply to this section.
3.1
At a constant test speed, the average force required to make the crack traverse the sample shown in Figure 1. The unit is mm
Figure 1 Sample
3.2
The tearing force is divided by the thickness of the sample.
GB/T 16577.1-2008/ISO 6383-1.1983
4 Significance
4.1 This method can be used as a basis for quality control, acceptance or rejection according to standards, and data required for research and development. 4.2 Tear performance may vary with sample preparation, test speed and test environment. Therefore, when you need to accurately compare the results, you should pay attention to Control these factors.
Generally speaking, as long as the thickness of samples of different materials does not differ by more than ± 10%, their tear strengths can be compared (see 3.2). But in When interpreting the test results, it should be noted that the tearing energy of different materials may vary significantly with the test speed. 5 Principle
Cut the sample to 1/2 place in the long axis direction of the sample, subject the two "trouser legs" formed by the incision to a tensile test, and test the tear along the long axis direction Calculate the tear strength of the material based on the average force required to crack the specimen (see Figure 1). 6 Instruments
6.1 Tensile testing machine (non-pendulum type). similar to that specified in GB/T 104.3-2006, with the following characteristics. 6.1.1 With the jig separation speed specified in Chapter 9.The load measuring device should be equipped with an automatic recorder, which can be applied from the beginning of the test The load on the sample is recorded as a function of time.
6.1.2 The clamp shall be equipped with jaws that can firmly hold the sample "trouser legs" without slipping. The width of the jaws should be greater than the width of the sample. The jaws should be parallel to each other and should not be mounted on a rotatable joint. 6.2 Thickness measuring device. an instrument for measuring the thickness of the sample according to the method described in GB/T 6672-2001.For embossed films or sheets, use The instruments specified in GB/T 20220-2006.
7 Sample
7.1 The shape and size of the sample are shown in Figure 1.The length of the cut in the center of the sample is 75mm ± 1mm. 7.2 The sample shall be cut so that the edges are smooth and free of gaps. It is recommended to use a low power microscope to check for nicks. Pay special attention to the top of the central cut of the specimen. 7.3 For some types of films and sheets, the tear resistance may vary with the direction of the film surface (anisotropy). In this case, you need To prepare two sets of samples, their main axes should be parallel or perpendicular to a specific direction of the film or sheet, which can be seen or Inferred by known manufacturing methods.
The specified test direction is the long axis direction of the sample.
Note. For some types of film, any test direction (for example, the machining direction or the direction perpendicular to it) may result in different tears Strength results. For example. when using the machining direction, the result depends on whether the tear propagation is along the machining direction or the opposite direction (see figure 2). When such a situation is known to occur, the specimen should be cut in two directions to obtain results in the two possible directions of tear propagation. Figure 2 The direction of tear propagation
GB/T 16577.1-2008/ISO 6383-1.1983
8.Number of samples
8.1 Test at least 5 specimens in each required direction.
8.2 Where the tear is not in a straight line and the crack is biased to the other end of the specimen, the specimen shall be discarded and another specimen shall be taken and retested (see 11.3). 9 Test speed
The test speed shall be..200mm/min ± 20mm/min or 250mm/min ± 25mm/min.
10 State adjustment
Unless otherwise specified, the sample should be adjusted and tested in accordance with GB/T 2918-1998, with an environmental condition of 23 ° C/50%. A known When the material is not sensitive to humidity, the environmental condition can be 23 ℃. 11 Steps
11.1 Use the measuring instrument specified in GB/T 6672-2001 to measure the thickness of the sample. For very thin films or embossed films, press GB/T 20220-2006 stipulates the method to measure the thickness.
11.1.1 When using the measuring instrument specified in GB/T 6672-2001, three points of equal distance between the tip of the sample cut and the other end of the sample Measure the thickness of the sample and take its arithmetic mean.
11.1.2 When measured according to the method specified in GB/T 20220-2006, the average thickness of the film sample shall be taken as the thickness of the sample. 11.2 Adjust the starting distance between the two clamps to 75mm, install the two trouser legs of the sample so that the main axis of the sample coincides with the center of the line of the clamp (see Figure 3).
Figure 3 Fixing method of the specimen in the fixture
GB/T 16577.1-2008/ISO 6383-1.1983
11.3 Set the required test speed (see Chapter 9), start the testing machine and record the load required to extend the crack over the uncut length of the specimen. If the tear line deviates from the center line to the other side of the specimen, the specimen should be discarded and the specimen should be taken and tested again. 12 Representation of results
12.1 The load-time curve recorded by the automatic recording device of the tensile testing machine shows the changes dependent on the characteristics of the tested material and its thickness Track.
Discard the load values of the first 20 mm and the last 5 mm of the uncut length at the time of tearing, and take the remaining 50 mm uncut length to bear The average value of the charge. When this part of the graph is a wavy platform, draw a midline parallel to the horizontal axis through the wavy curve (see Figure 4). Read the load corresponding to this midline and record it as the tearing force of the sample. Figure 4 Load-time diagram of the stationary part of the curve
12.2 Calculate the tear strength of the sample by equation (1).
(1)
In the formula.
σ --- Tear strength of the sample, unit kN/m (kN/m);
Ft --- average tearing force, unit Newton (N);
Note. When the result does not need to be expressed in tear strength, the tear force can be reported directly. 12.3 Calculate the arithmetic mean of each group of samples.
12.4 If necessary, calculate the standard deviation and coefficient of variation of each group of samples. 13 Test report
The test report shall include the following.
a) Indicate the adoption of this part of GB/T 16578;
b) A complete description to identify the test material, including type, source, manufacturer code, shape and previous experience c) The thickness of the tested material;
d) Number of samples;
e) Test speed;
f) Tear strength and/or tear force in each test direction and tear propagation direction; GB/T 16577.1-2008/ISO 6383-1.1983
g) Single test result;
h) GB/T 2918-1998 standard environment for condition adjustment and testing and any pre-treatment; i) If necessary, give the standard deviation and coefficient of variation of the test results; j) Any operation details that may affect the results do not comply with the provisions of this part of GB/T 16578. GB/T 16577.1-2008/ISO 6383-1.1983

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