GB/T 8323.2-2008 PDF EnglishUS$145.00 · In stock · Download in 9 seconds
GB/T 8323.2-2008: Plastic - Smoke generation - Part 2: Determination of optical density by a single-chamber test 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 8323.2-2008: Plastic - Smoke generation - Part 2: Determination of optical density by a single-chamber test---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/GBT8323.2-2008 Plastic. Smoke generation. Part 2. Determination of optical density by a single-chamber test ICS 13.220.40 G31 National Standards of People's Republic of China GB/T 8323.2-2008/ISO 5659-2.2006 Replace GB/T 8323-1987 Plastic smoke generation Part 2. Test method for determination of smoke density by single chamber method (ISO 5659-2.2006, IDT) Released on.2008-12-30 2009-08-01 implementation General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China China National Standardization Administration issued Content Foreword I 1 Scope 1 2 Normative references 1 3 Terms and Definitions 1 4 Principle 2 5 Materials for testing 2 6 Sample structure and preparation 3 7 Instruments and auxiliary equipment 4 8 Test environment 15 9 Installation and Calibration Procedure 15 10 Test Step 18 11 results indicate 19 12 precision 20 13 Test report 20 Appendix A (Normative) Calibration of the heat flow meter 21 Appendix B (informative) Variability of smoke-to-optical density measured in single-chamber measurements 22 Appendix C (informative) Determination of mass optical density 24 Appendix D (informative) Expansive materials test data precision 29 Reference 31 GB/T 8323.2-2008/ISO 5659-2.2006 ForewordGB/T 8323 "Plastic Smoke Generation" is divided into the following two parts. --- Part 1. Guidelines for smoke density test methods; --- Part 2. Test method for determination of smoke density by single chamber method. This part is the second part of the standard GB/T 8323, equivalent to ISO 5659.2.2006 "Plastic - smoke generation --- Part 2 Points. Single-chamber Method for Measuring Optical Density, for editorial changes. --- Removed the preface to ISO 5659.2.2006; --- Replace "this part of ISO 5659" with "this part of GB/T 8323"; --- Replace the international standards cited in the standard with the corresponding national standards; --- Change some expressions applicable to international standards to those applicable to Chinese standards. This part replaces GB/T 8323-1987 "Plastics Density Test Method for Plastics Burning Performance", compared with GB/T 8323-1987 The differences are as follows. --- Adding materials other than plastics in the scope of application (the original post-title suspension section, 1.1 of this edition); --- Increased the main purpose of this test method (1.3 of this edition); --- It is clear that the smoke generated by the material will vary according to the irradiance of the sample exposed, and the test mode is added to the test method. And illuminance requirements (1.4 and 10.9.1 of this edition); --- Added normative references (Chapter 2 of this edition); --- Added 10 terms and definitions for assemblies, composites, irradiance, etc., removed the term flameless combustion test and flaming combustion Test 2 terms and definitions (Chapter 1 of the original, Chapter 3 of this edition); --- Added principle (Chapter 4 of this edition); --- Increased the distance between the sample and the radiation cone from the sample when the pre-test of the expansive material is 50mm (6.1.4 of this edition); ---The side length tolerance of the sample changed from "0-+0.5mm" to "±1mm", and the thickness is specified as 25mm (original version 2.1, this edition) 6.2); ---The requirements for the sample liner are divided into three categories according to the thickness of the sample (6.4.2 of this edition); --- Added sample preparation requirements for elastic materials and thin airtight specimens (6.4.3 and 6.4.4 of this edition); --- The state adjustment time changed from 24h to the constant weight of the sample (Chapter 3 of the original, 6.5.1 of this edition), adding state adjustment Sample placement requirements (6.5.2 of this edition); ---Specified size and functional requirements for equipment (Chapter 4 of the original, Chapter 7 of this edition); --- Cancel the operation of covering the test box window with opaque curtain when the transmittance is less than 0.01% (the original 5.13); --- Increased the test environment (Chapter 8 of this edition); --- Added calibration of various parts of the device (Chapter 9 of this edition); --- The termination time of the test is the minimum or 10min transmittance (the original version of 5.14, 10.8 of this edition); --- Cancel the calculation formula of average smoke speed, calibration smoke density, and sample mass loss rate; --- Appendix A is changed from "Calibration and detailed description of test equipment (supplement)" to "Calibration of heat flow meter (normative appendix)"; --- Appendix B changed from "Calculation example and supplementary calculation (supplement)" to "Variation of smoke specific optical density measured in single-chamber measurement" (informative appendix)"; --- Added Appendix C "Determination of Mass Optical Density (Informative Appendix)" and Appendix D "Precision of Test Data for Expansive Materials (Information Sexual appendix)"; --- Added references. GB/T 8323.2-2008/ISO 5659-2.2006 Appendix A of this part is a normative appendix, and Appendix B, Appendix C and Appendix D are informative appendices. This section was proposed by the China Petroleum and Chemical Industry Association. This part is under the jurisdiction of the National Plastics Standardization Technical Committee General Method and Product Branch for Plastic Resins (SAC/TC15/SC4). This section is responsible for drafting the unit. National Synthetic Resin Quality Supervision and Inspection Center. Participated in the drafting of this section. Nanjing Jiangning District Analytical Instrument Factory, Guangzhou Blonde Technology Co., Ltd., National Plastic Products Quality Inspection Center (Fuzhou). The main drafters of this section. Zhao Ping, Wang Fuhai, Li Jianjun, He Wei. This section replaces the previous status of the standard. GB/T 8323-1987. GB/T 8323.2-2008/ISO 5659-2.2006 Plastic smoke generation Part 2. Test method for determination of smoke density by single chamber method1 Scope1.1 This part of GB/T 8323 specifies specimens of sheets, composites or specimens not exceeding 25 mm in thickness, placed vertically In a closed cabinet equipped with a specified level of heat radiation source, the side that generates smoke from the exposed surface is measured with or without a pilot flame. law. This test method is applicable to all plastics and can also be applied to the evaluation of other materials (eg rubber, textile coverings, painted surfaces, Wood and other materials). 1.2 It should be noted that the optical density value of the smoke measured by this test method is measured under the specified shape and size of the sample or assembly. It cannot be considered as its inherent basic performance. 1.3 This test is mainly used for R&D and fire safety engineering of buildings, trains, boats, etc., and cannot be used as the basis for building rating or Other purposes. There is no basis for predicting the smoke density produced by materials exposed to heat or flame under other (actual) combustion conditions, There is also no connection to the data obtained by other test methods. This test procedure eliminates the effects of irritants on the eye. Note. This test procedure discusses the loss of vision due to smoke density, which is usually independent of irritancy, as explained in Section 1 of this standard. 1.4 It is important to emphasize that the smoke generated by the material will vary depending on the illuminance of the sample exposed. Therefore, at the junction using this method If it is confirmed, the sample should be exposed to the specified illuminance of 25kW/m2 or 50kW/m2.2 Normative referencesThe terms in the following documents become the provisions of this part by reference in this part of GB/T 8323-2008. Any dated Reference documents, all subsequent amendments (not including errata content) or revisions do not apply to this section, however, encouragement under this Part The parties that reached the agreement examined whether the latest version of these documents could be used. For undated references, the latest edition applies. In this section. GB/T 2918-1998 Standard environment for conditioning and testing of plastic specimens (idt, ISO 291.1997) GB/T 8323.1-2008 Plastics -- Part 1 . Guidelines for smoke density test method (ISO 5659-1.1996, IDT) ISO 13943 Fire Safety - Vocabulary3 Terms and definitionsThe following terms and definitions established by ISO 13943 apply to this section. 3.1 Articles of materials and/or composites. Such as. three-layer sandwich panels. Note. The assembly may contain voids. 3.2 A composite material is generally considered to be a whole composed of discrete entities. Such as coating materials and laminates. 3.3 The deviation does not exceed the surface of the 1 mm plane. GB/T 8323.2-2008/ISO 5659-2.2006 3.4 Subject to heated product surface under test conditions. 3.5 The ratio of the radiant flux incident into an infinitesimal area to that area. 3.6 A substantially single base material or a homogeneously dispersed mixture. Such as metal, stone, wood, cement, mineral fibers or polymers. 3.7 The opacity of the smoke as determined by the mass loss. Note. Refer to Appendix C for the determination method. 3.8 The degree of opacity of smoke is expressed as the negative logarithm of the relative transmittance. 3.9 A material, composite or assembly of properties to be determined. 3.10 The product of the optical density and a factor, which is the ratio of the test chamber volume to the sample exposure area and the optical path product of the beam. owned. Note. See 11.1. 3.11 Samples of the article with a substrate or surface coating that were tested. Note. The sample may contain voids. 3.12 Unstable material, when the distance between the cone heater and the sample is 25mm, the thickness is greater than 10mm during the test. Carbonized expansion structure.4 PrincipleThe sample is placed horizontally in the test box, and the upper surface of the sample is exposed to heat radiation with a constant irradiance set at 50 kW/m2. Under the source. The generated smoke was collected in a test box equipped with a luminometer. The attenuation of the beam after passing the smoke is measured. The result is lighter than the light Degree representation.5 materials suitable for testing5.1 Material geometry 5.1.1 This method is applicable to sheet materials, composite materials or assemblies with a thickness not exceeding 25 mm. GB/T 8323.2-2008/ISO 5659-2.2006 5.1.2 This test method is for the set of specimens in geometry, surface orientation, thickness (integral thickness or thickness of individual layers), mass and material. The small changes in the formation are very sensitive, so the test results measured by this method are only applicable to the test material at this thickness. Impossible to be lighter than The degree is converted from one thickness of the material to a specific optical density at another thickness. 5.2 Physical properties Materials evaluated by this test method may have many different surfaces or contain different materials in a different order. If any surface is exposed to fire conditions during use, these surfaces should be evaluated.6 sample structure and preparation6.1 Number of samples 6.1.1 If testing is to be carried out in 4 modes (see 10.9.1), at least 12 specimens are required. 6 specimens at 25 kW/m2 The next test (three samples use a pilot flame, three samples do not use a pilot flame); six samples are tested at 50kW/m2 (3 tests) The pilot flame was used, and the pilot flame was not used for the three samples. If the test uses less than four modes, then at least 3 samples are required for each mode. 6.1.2 According to the requirements of 5.2, each side shall be tested with the number of additional samples specified in 6.1.1. 6.1.3 If the mode specified in 10.9.2 is required, an additional 12 samples (ie 3 samples per mode) shall be prepared for use. Samples are taken. 6.1.4 For expansive materials, the cone heater should be pre-tested 50 mm from the sample, so at least 2 more should be prepared. sample. 6.2 Sample size 6.2.1 The specimen is a square with a side length of 75 mm ± 1 mm. 6.2.2 When the nominal thickness of the material is not more than 25 mm, it shall be evaluated over the entire thickness. If a comparative test is performed, the material is evaluated. The thickness should be 1.0mm ± 0.1mm. When the material burns in the test chamber, it will consume oxygen, and some materials (especially fast burning or thick Sample) The generation of smoke is affected by a decrease in the oxygen concentration in the test chamber. Test specimens should be as far as possible using the final thickness test. 6.2.3 When the thickness of the material is more than 25mm, the thickness of the sample shall be processed to 25mm±1mm, and then the original surface (raw surface) shall be Line evaluation. 6.2.4 For multi-layer material samples with a thickness greater than 25 mm and composed of different materials, the core layer and the skin layer shall be prepared according to the provisions of 6.2.3 (see 6.3.2) 6.3 Sample preparation 6.3.1 Specimens shall be representative and prepared in accordance with the procedures described in 6.3.2 and 6.3.3. The sample should be from a sample with uniform material Areas should be cut, sawed, molded or stamped and their thickness records should be kept and their quality records should be retained if necessary. 6.3.2 If a flat section of the same thickness and composition is used instead of a bend, a forming part or a special part of the test, it shall be referred to in the report. Out. Any matrix or core material of the sample should be the same as in actual use. 6.3.3 When coating materials, including coatings and adhesives, are tested with the substrate or core material in actual use, they should be handled according to the usual operation. To prepare samples. For this case, the coating method, the number of coatings, and the type of substrate should be indicated in the test report. 6.4 Package of sample 6.4.1 Wrap the entire back of the specimen with a complete piece of aluminum foil (approximately 0.04 mm thick) and wrap the front side of the specimen along the edge On the periphery, only the center test area of 65 mm × 65 mm is left, and the dark side of the aluminum foil is in contact with the sample. Care should be taken when handling Pierce the aluminum foil or make the aluminum foil have excessive wrinkles. The folding of the aluminum foil should be such that the melting loss of the sample at the bottom of the sample box is minimized. Placed in the sample After entering the sample box, the excess aluminum foil along the front edge should be trimmed off. 6.4.2 Requirements for the liner of the wrapped sample. a) After wrapping, if the thickness of the sample is not more than 12.5mm, the nominal thickness is 12.5mm and the drying density is 850kg/ M3±100kg/m3 Non-combustible insulation board and low-density refractory fiber felt (nominal density 65kg/m3) together as a gasket GB/T 8323.2-2008/ISO 5659-2.2006 The fire fiber mat should be under the non-combustible insulation board. b) After wrapping, if the thickness of the sample is greater than 12.5mm and less than 25mm, use low-density refractory fiber felt (nominal density is 65kg/ M3) as a liner. c) When the thickness of the sample after wrapping is 25mm, no gasket or refractory fiber felt shall be used. 6.4.3 For elastic materials, the sample wrapped in aluminum foil shall be placed in the sample box in such a manner that the exposed surface of the sample shall be open to the sample box. The inner surface is flush. When the exposed surface of the material is not flat, the material should not exceed the opening plane of the sample box. 6.4.4 When a thin, gas impermeable specimen, such as a thermoplastic film, is expanded during the test due to the presence of air between the membrane and the gasket, In order to keep the sample still flat, 2 to 3 openings (20 mm to 40 mm long) can be cut on the film as an exhaust port. 6.5 State adjustment 6.5.1 Before preparing the sample, the sample should be adjusted at 23 °C ± 2 °C and relative humidity (50 ± 10)% until constant weight. In two successive weighings with an interval of 24h, the difference in mass of the sample is not more than 0.1% of the mass of the sample or not more than 0.1g, which is constant weight (see GB/T 2918-1998). 6.5.2 In the condition box, the specimen shall be placed on the bracket so that air can come into contact with all surfaces. Note. To speed up the state adjustment process, air flow can be driven in the condition adjustment tank. The results measured by this test method are sensitive to changes in the state of the sample. Therefore, carefully follow the requirements of 6.5 to operate ten It is important.7 Instruments and auxiliary equipment7.1 Overview The instrument (see Figure 1) is equipped with a sample box, a radiation cone, an igniter, a light transmission and measuring device, and others, as well as some ease of experimental operation. A closed test box for the controlled equipment. 7.2 Test box 7.2.1 Structure 7.2.1.1 The test box (see Figures 1 and 2) shall be made of a multi-layer board whose inner surface shall be coated with enamel or resistant to a thickness of not more than 1 mm. Learn the corrosion and metal layers that are easy to clean. The internal dimensions of the test box should be 914mm ± 3mm long, 914mm ± 3mm high, 610mm ±3mm deep. The test box shall have a hinged front door with a window and an active opaque visor that blocks the window to Avoid light entering the sealed box. In the test box, there should be aluminum foil with a thickness of not more than 0.04mm and an area of not less than 80600mm2. The safety rupture discs composed shall be airtight during their installation. The rupture disc can be protected with a stainless steel wire mesh. The screen was fixed 50 mm from the rupture disc to prevent the rupture disc from exploding. 7.2.1.2 There shall be 2 light windows with a diameter of 75 mm, one at the top of the test box and the other at the bottom, as shown in Figure 2. The inner surface of the light window should be flush with the outside of the test box lining. Below the lower window should be equipped with a ring electric heater of about 9W to ensure the light window The temperature of the upper surface (50 ° C ~ 55 ° C is appropriate) in order to minimize the smoke concentration on the surface, and the heater should be installed near the light window The edge position avoids affecting the light path. An 8mm thick optical platform should be installed around the light window outside the test box. Less than 12.5mm metal rods that can be attached to the fixed platform and test box. 7.2.1.3 The appropriate opening for other applications shall be available at the appropriate location on the test box. These openings shall be capable of being inspected in accordance with 7.6 and 9.6. It is closed and can withstand and maintain the internal pressure of the test chamber greater than the atmospheric pressure of 1.5kPa (150mmH2O) (see 7.2.2). Test box Some should be able to withstand greater pressure than safety rupture discs. 7.2.1.4 The air inlet with the baffle shall be placed at the top of the front of the test box or at the top of the test box and away from the radiation cone. Row with baffles The port should be placed at the bottom of the test box and pass through a hose with a diameter of 50mm to 100mm and can produce at least 0.5kPa (50mmH2O). The suction of the negative pressure is connected. 7.2.2 Test box pressure control device In order to control the internal pressure of the test box, some accessories should be prepared. The range that should have a connection to the pressure regulator and the top of the tank is 1.5 kPa (150 mm H2O) water column pressure gauge. GB/T 8323.2-2008/ISO 5659-2.2006 A suitable pressure regulator (see Figure 3) should be filled with water and placed in the front of the test chamber with a 25 mm diameter hose end Insert 100mm below the surface and connect the other end to the pressure gauge and test box. The outlet of the pressure regulator should be connected to the exhaust system. Note. Other suitable flow indicating fluids may be selected in the pressure gauge instead of the water-staining level indication. 1---photomultiplier tube black box; 2---radiation cone; 3---igniter; 4---bursting disc; 5---The lower window of the optical system. Figure 1 Schematic diagram of the test equipment GB/T 8323.2-2008/ISO 5659-2.2006 The unit is mm 1---exhaust port; 2---the thermocouple on the inner wall; 3---optical platform; 4---radiation cone assembly; 5---light window; 6---bursting disc; 7---window heater. Figure 2 Top view of a typical test box GB/T 8323.2-2008/ISO 5659-2.2006 The unit is mm 1---connected to the exhaust system; 2---test box wall; 3--- Prevent liquid from sucking up; 4---Exhaust of the test box; 5---jar with lid; 6---Glass pressure tube or U-tube (filling water - staining liquid level to 0 scale line). Figure 3 Typical box pressure relief meter 7.2.3 Test box wall temperature The thermocouple measuring junction made of wire with a diameter of not more than 1mm shall be installed at the geometric center inside the back wall of the test box, with thickness An insulating sheet (such as polystyrene foam) with a diameter of about 6.5 mm and a diameter of not more than 20 mm covers the thermocouple and the insulating sheet is coated with a suitable adhesive. Fixed to the test box wall. The thermocouple should be connected to the recording device or meter and the system should be capable of measuring a temperature range of 35 ° C to 80 ° C Wai (see 10.2.2). 7.3 Sample fixation and heating distribution 7.3.1 Radiation cone 7.3.1.1 The radiation cone consists of a heating element rated at 2600 W. The heating element contains a length that is wound into a truncated cone shape. 2210mm stainless steel tube with a diameter of 6.5mm and can be fixed in the cover. The overall height of the cover is 45mm ± 0.4mm, and the inside is straight. The diameter is 55 mm ± 1 mm, and the diameter of the base is 110 mm ± 3 mm. There are two stainless steel plates with a thickness of 1mm in the outer cover. 10mm thick ceramic fiber with a nominal density of 100kg/m3 is insulated. The heating elements should be clamped and secured to the upper and lower surfaces of the enclosure. 7.3.1.2 The radiation cone shall be capable of providing an irradiance of 10 kW/m2 to 50 kW/m2 at the center of the sample surface. When testing the irradiance of the other two locations 25 mm from the center of the sample, the irradiance of the two locations cannot be lower than the sample. GB/T 8323.2-2008/ISO 5659-2.2006 85% of the central irradiance. 7.3.1.3 The temperature controller for the radiation cone shall be proportional, integral and differential type 3 with fast cycle thyristor stack or phase angle control The controller has a maximum rating of at least 10A. The adjustment time of the integration time within 50s and the derivative time within 30s should be The response characteristics of the heater are suitably matched. The temperature controlled by the heater should be stable at ±2 °C. Input temperature range should be 0 ° C ~ 1000 ° C. When the heater temperature is between 700 ° C and 750 ° C, the irradiance at the sample 25 mm below the edge should be 50 kW / M2. It should also be equipped with automatic cold junction compensation for thermocouples. Note. Table D. 3 gives the test heater temperature range for the distance between the edge of the radiation cone and the sample of 50 mm. 7.3.1.4 The irradiance of the radiation cone shall be controlled by direct reading of two Type K thermocouples that directly mount the contact elements but do not weld the components. 2 roots The thermocouples should be of equal length and connected in parallel to the temperature controller. The thermocouple is approximately one-third of the surface of the top end of the radiation cone. Phase angle control can be used in the radiation cone temperature controller, but filters are used to reduce interference requirements. 7.3.2 Support structure of radiation cone, sample box and heat flow meter The radiation cone is fixed and protected by a vertical positioning rod of the support frame, so for non-expanding materials, the radiation cone is placed horizontally when the sample is placed The lower edge of the outer cover junction is 25 mm ± 1 mm above the upper surface of the sample. For intumescent materials, this distance should be 50mm. The details of the radiation cone and the support portion are shown in Figures 4 and 5. 7.3.3 Radiation cone shield Remote metal and/or inorganic protective covers (see Figures 5 and 6) with a diameter of not less than 130 mm are blocked before and after exposure The sample is exposed to radiation and the upper surface of the shield is positioned approximately at the center of the radiation cone base and the sample. Note. This device is required in order to be able to repeat the test without cutting off the radiation cone power supply. 7.3.4 Heat flow meter 7.3.4.1 The heat flow meter shall be a thermoelectric element (Schmidt-Boelter) with a range of 50 kW/m2. The area receiving radiation (see Figure 4) should be A flat area of 10 mm in diameter with a matte black finish on the surface. The heat flow meter should be cooled by water cooling. 7.3.4.2 According to the 7.8.6 heat flow meter, it should be directly connected with a suitable recording device or meter. When the instrument is calibrated, the heat flow meter should be able to ensure that it is recorded. The recorded heat flux of 25kW/m2 and 50kW/m2 is accurate to ±1kW/m2. If the recorder uses only millivolts as the output unit, the millivolt value should be converted to the specified value by using the calibration factor (or the equation used). Heat flux kW/m2. 7.3.4.3 When the heat flux exposed to 25kW/m2±1kW/m2 and 50kW/m2±1kW/m2 exceeds the average of the heat flow meter For a 10 mm diameter zone, the response time of the heat flow meter system should be compared to the response time of the original reference standard according to Appendix A. Perform calibration. 7.3.5 Sample box The details of the sample box are shown in Figure 7. A low density of not less than 10 mm is arranged at the bottom of the sample box (nominal density is 65 kg/ M2) refractory fiber mat (unless the sample thickness is 25 mm, see 6.4.2). Use a retainer structure to reduce non-representative edges of composite samples Burning edge. The sample should not raise the retainer ... ......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 8323.2-2008 be delivered?Answer: The full copy PDF of English version of GB/T 8323.2-2008 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 8323.2-2008_English with my colleagues?Answer: Yes. The purchased PDF of GB/T 8323.2-2008_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 8323.2-2008 -- 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.How to buy and download a true PDF of English version of GB/T 8323.2-2008?A step-by-step guide to download PDF of GB/T 8323.2-2008_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 8323.2-2008". 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 |
