GB/T 39693.3-2021 English PDFUS$264.00 · In stock
Delivery: <= 3 days. True-PDF full-copy in English will be manually translated and delivered via email. GB/T 39693.3-2021: Rubber, vulcanized or thermoplastic - Determination of hardness - Part 3: Dead-load hardness using the very low rubber hardness(VLRH) scale Status: Valid
Basic dataStandard ID: GB/T 39693.3-2021 (GB/T39693.3-2021)Description (Translated English): Rubber, vulcanized or thermoplastic - Determination of hardness - Part 3: Dead-load hardness using the very low rubber hardness(VLRH) scale Sector / Industry: National Standard (Recommended) Classification of Chinese Standard: G40 Word Count Estimation: 14,186 Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration GB/T 39693.3-2021: Rubber, vulcanized or thermoplastic - Determination of hardness - Part 3: Dead-load hardness using the very low rubber hardness(VLRH) scale---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order. Rubber, vulcanized or thermoplastic - Determination of hardness Part 3.Dead-load hardness using the very low rubber hardness(VLRH) scale ICS 83.060 G40 National Standards of People's Republic of China Determination of the hardness of vulcanized rubber or thermoplastic rubber Part 3.Use Ultra Low Rubber Hardness (VLRH) Scale Determine the hardness of the test force (ISO 48-3.2018, IDT) Released on 2021-03-09 2021-10-01 implementation State Administration of Market Supervision and Administration Issued by the National Standardization Management Committee ForewordGB/T 39693 "Determination of the hardness of vulcanized rubber or thermoplastic rubber" is planned to be divided into the following 9 parts. ---Part 1.Introduction and Guide; ---Part 2.International Rubber Hardness (10IRHD~100IRHD); ---Part 3.Use the ultra-low rubber hardness (VLRH) scale to determine the hardness of the test force; ---Part 4.Determine the indentation hardness by the Shore hardness tester method (Shore hardness); ---Part 5.Use the portable international rubber hardness tester to determine the indentation hardness; ---Part 6.Use the IRHD method to determine the apparent hardness of the rubber roller; ---Part 7.Use the Shore hardness tester to determine the apparent hardness of the rubber roller; ---Part 8.Using Zhao's (P ---Part 9.Calibration and verification of the hardness tester. This part is Part 3 of GB/T 39693. This section was drafted in accordance with the rules given in GB/T 1.1-2009. The translation method used in this part is equivalent to the adoption of ISO 48-3.2018 ``Determination of the hardness of vulcanized rubber or thermoplastic rubber Part 3.Use Ultra-low rubber hardness (VLRH) scale to determine the hardness of the test force". The Chinese documents that have a consistent correspondence with the international documents cited in this section are as follows. ---GB/T 2941-2006 Rubber Physical Test Method General Procedure for Sample Preparation and Adjustment (ISO 23529.2004, IDT) ---GB/T 25269-2010 Rubber Test Equipment Calibration Guidelines (ISO 18899.2004, IDT) This part was proposed by the China Petroleum and Chemical Industry Federation. This part is under the jurisdiction of the General Test Methods Subcommittee of the National Rubber and Rubber Products Standardization Technical Committee (SAC/TC35). Drafting organizations of this section. Guangdong Institute of Metrology, German Business Borui Instrument (Shanghai) Co., Ltd., Industrial Chain (Ningbo) Information Technology Co., Ltd., Xinlun Technology (Changzhou) Co., Ltd., Guangdong Crown Adhesive Products Co., Ltd., Sailun Group Co., Ltd., Beijing Rubber Industry Industry Research and Design Institute Co., Ltd. The main drafters of this section. Hu Zhukuan, Chen Minghua, Shen Shilong, Chen Zhiguang, Tan Zhixue, Wang Cheng, Yue Wei, Ding Yulan, Li Chunlei, Li Jianxiong, Zhang Wei, Xie Junfang, Sun Siwen.IntroductionThe hardness test method specified in this document is for rubber with a hardness below 35IRHD in the International Rubber Hardness Scale (ISO 48-2). A more recognizable alternative. The AO scale method of soft rubber shore hardness tester is given in ISO 48-4.Typical application packages of these methods Including low modulus support, soft roll outer rubber and printing rubber. Figure 1 shows the comparison of the hardness ranges of IRHDN and IRHDL in the ISO 48-2 standard with the VLRH hardness ranges in this part. The main difference between these methods is the diameter of the spherical indenter and the size of the press-in force. The appropriate method can be selected according to the specific application. Determination of the hardness of vulcanized rubber or thermoplastic rubber Part 3.Use Ultra Low Rubber Hardness (VLRH) Scale Determine the hardness of the test force1 ScopeThis part of GB/T 39693 specifies a method for measuring ultra-soft vulcanized rubber or thermoplastic rubber using an ultra-low rubber hardness (VLRH) scale. The method of gel setting test force hardness. The indentation depth of the spherical indenter has a linear relationship with the VLRH scale.2 Normative referencesThe following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this article Pieces. For undated reference documents, the latest version (including all amendments) is applicable to this document. ISO 48-9.2018 Determination of hardness of vulcanized rubber or thermoplastic rubber Part 9.Calibration and verification of durometer (Rubber, vulcanizedorthermoplastic-Determinationofhardness-Part 9.Calibrationandverificationofhard- nesstesters) ISO 18899 Rubber-Guidetothecalibrationoftestequipment (Rubber-Guidetothecalibrationoftestequipment) ISO 23529 Rubber-General procedures for the preparation and adjustment of rubber physical test methods (Rubber-General procedures forpre- paringandconditioningtestpiecesforphysicaltestmethods)3 Terms and definitionsTerms and definitions are not listed in this document. ISO and IEC have established terminology databases for standardization purposes. The website is as follows.4 Test principleThis hardness test includes the measurement of the indentation depth difference of the spherical indenter pressed into the rubber surface under the action of a small contact force and a large total force. value. According to this difference, the "Very Low Rubber Hardness" (VLRH) value can be obtained from Table A.1 (see Appendix A) or a curve drawn based on this table. Or it can be directly read by a ruler calculated from the table and installed on the indentation depth measuring device.5 InstrumentsThe main components of the instrument are as follows, and suitable dimensions and force values are shown in Table 1.See references [3] and [4] for details. 5.1 Vertical guide bar Vertically movable pressure rod, the lower end is a rigid ball or spherical surface, the support device of the pressure rod can make it just before applying contact force The lower end of the sex ball is slightly higher than the reference surface of the annular foot. 5.2 Device for applying contact force and press-in force to the press rod The acting force includes the weight of the pressure rod and the accessories connected to it, as well as all spring forces that may act on the pressure rod, so that it is actually applied to the pressure rod. The force at the end of the rod meets the regulations. 5.3 A device for measuring the increase in the indentation depth of the plunger produced by the indentation force The maximum uncertainty in millimeters is 0.001mm, or when reading the VLRH value directly, a score of at least 0.5VLRH can be obtained Discernment. 5.4 Annular flat foot pressing It is perpendicular to the axis of the pressing rod and has a concentric circular hole through which the pressing rod passes. A device for pressing the foot on the sample, pressing the foot and measuring the depth of indentation It is a rigid connection. The displacement measured in this way is the displacement of the pressure rod relative to the pressure foot (that is, the upper surface of the sample), not the pressure rod relative to the support. The surface displacement of the specimen. If the surface of the test sample is curved, the test result needs to be corrected. Samples with flat surface and curved surface of the material Tests are required to obtain the hardness difference (Hcurved-Hflat). Take the opposite of the difference to correct samples with similar materials to curved surfaces The hardness value measured on the above. 5.5 Sample stage Used to support the sample, the sample table is flat and perpendicular to the axis of the pressure rod. Table 1 Force values and dimensions of the instrument Contact force/mN Press-in force/mN Total force/mN Press-foot force/mN 8.3±0.5 91.7±0.5 100.0±1.0 235±30 Diameter/mm Spherical indenter diameter, foot diameter, hole diameter 2.50±0.01 6.0±0.5 3.0±0.16 CalibrationRefer to Appendix B for the calibration requirements of measuring instruments.7 SpecimenThe sample should be prepared in accordance with ISO 23529. The upper and lower surfaces of the sample should be flat, smooth and parallel to each other. The thickness of the standard sample is at least 6mm, and it can be composed of one, two or three layers of rubber. The thickness of the thinnest layer should not be Less than 2mm. The transverse dimensions of the sample should meet at least three hardness measurements, and the distance between the measuring points should be at least 10mm. The measuring point is at least 3mm away from the edge of the sample. Other size samples or finished samples can also be used, but they usually produce different results from standard samples.8 Time interval between curing and testingThe time interval between vulcanization and testing should comply with ISO 23529.9 Adjustment of the sampleThe sample should be adjusted at the standard laboratory temperature (see ISO 23529) for at least 3h before testing. 10 Test temperature The test should be carried out at the same standard laboratory temperature as used for conditioning. 11 Procedure Place the sample on a horizontal sample table, and lower the pressure foot to contact the surface of the sample. Under the action of contact force, the pressure rod and the spherical indenter are in the Keep it on the rubber for 5 seconds. If the durometer is indexed with ultra-low rubber hardness (VLRH), it should be adjusted to a reading of 100 at the end of the 5s time; then apply Press the force and hold for 30s, at this time, the ultra-low rubber hardness (VLRH) value can be directly read. If the hardness tester is divided by length units, the difference D of the indentation depth of the compression rod caused when the indentation force is applied for 30 s should be recorded, and the difference D, according to Table A.1 Or the curve obtained from this table can be converted to the corresponding VLRH value. Repeat the measurement at three different positions on the sample, take the median of the three results as the measurement result, pay attention to the distance between each measurement point Should meet the requirements of Chapter 7. 12 Test report The test report should include the following. a) Description of samples and test specimens. 1) A detailed description of the sample and its source; 2) If necessary, the conditions of mixing and vulcanization; 3) The size of the sample; 4) The number of layers and the thickness of the thinnest layer of the sample; 5) If it is a curved or irregular sample, a description of the sample; 6) The method of preparing the sample from the sample, such as molding or cutting. b) Test method. 1) The name and number of the standard used; 2) For bending specimens, the method of fixing the specimen and the method of applying the test force. c) Test details. 1) The time and temperature of the sample adjustment; 2) If necessary, test temperature and relative humidity; 3) Any deviation from the procedures specified in this section. d) Test results. 1) Number of samples; 2) Single test result; 3) The median value of the test result, the result is expressed as 15VLRH. e) Test date. ......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of GB/T 39693.3-2021_English be delivered?Answer: Upon your order, we will start to translate GB/T 39693.3-2021_English as soon as possible, and keep you informed of the progress. 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