GB/T 4740-2024 English PDF

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GB/T 4740-2024: Test method for strength of ceramic materials
Status: Valid

GB/T 4740: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 4740-2024	119	Add to Cart	3 days	Test method for strength of ceramic materials	Valid
GB/T 4740-1999	139	Add to Cart	2 days	Standard test method for compressive resistance ceramic materials
GB/T 4740-1984	RFQ	ASK	3 days	Standard test method for compressive resistance of domestic ceramic	Obsolete

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Basic data

Standard ID: GB/T 4740-2024 (GB/T4740-2024)
Description (Translated English): Test method for strength of ceramic materials
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: Y24
Classification of International Standard: 81.060.20
Word Count Estimation: 6,622
Date of Issue: 2024-11-28
Date of Implementation: 2025-06-01
Older Standard (superseded by this standard): GB/T 4740-1999,GB/T 4741-1999
Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration

GB/T 4740-2024: Test method for strength of ceramic materials

---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.
ICS 81.060.20 CCSY24 National Standard of the People's Republic of China Replace GB/T 4740-1999, GB/T 4741-1999 Test methods for strength of ceramic materials Released on 2024-11-28 2025-06-01 Implementation State Administration for Market Regulation The National Standardization Administration issued

Foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1.Structure and drafting rules for standardization documents" Drafting. This document replaces GB/T 4740-1999 "Test Method for Compressive Strength of Ceramic Materials", GB/T 4741-1999 "Test Method for Flexural Strength of Ceramic Materials" Compared with GB/T 4740-1999 and GB/T 4741-1999, in addition to structural adjustments and editorial changes, the main technical changes are The following. --- Changed the scope (see Chapter 1, Chapter 1 of GB/T 4740-1999 and Chapter 1 of GB/T 4741-1999); --- Changed the requirements for the size of the flexural strength specimens (see 5.2.1, 4.1 of GB/T 4741-1999); --- Changed the provisions for sample drying in the compressive strength test procedure (see 6.1.1, 5.1 of GB/T 4740-1999); --- Changed the provisions on the number of discarded specimens for re-testing (see 7.1.3, 7.2.3, 6.2.2 and 6.2.2 of GB/T 4741-1999) Please note that some of the contents of this document may involve patents. The issuing organization of this document does not assume the responsibility for identifying patents. This document was proposed by China Light Industry Federation. This document is under the jurisdiction of the National Technical Committee for Standardization of Daily-Use Ceramics (SAC/TC405). This document was drafted by. Jiangxi Ceramic Testing Center, Fujian Daily Ceramic Product Quality Supervision and Inspection Center, People's Republic of China Yixing Customs, Chongqing Jinhui Ceramics Co., Ltd., China Light Industry Ceramics Research Institute, Fujian Huaxia King Kong Technology Co., Ltd. The main drafters of this document are. Ao Min, Chen Guodian, Wang Jinli, Zhang Jiyi, Xiao Jianxiang and Lin Xiaowa. The previous versions of this document and the documents it replaces are as follows. --- First published in 1984 as GB/T 4740-1984 and GB/T 4741-1984, first revised in.1999; ---This is the second revision. Test methods for strength of ceramic materials

1 Scope

This document describes the method for determining the compressive strength and flexural strength of ceramic materials at room temperature. This document is applicable to the determination of ceramic materials and their auxiliary materials.

2 Normative references

This document has no normative references.

3 Terms and definitions

The following terms and definitions apply to this document. 3.1 Compressive strength The maximum load that a material can bear per unit area. 3.2 Bending strength The maximum stress when the specimen is subjected to static bending force and fails. Note. It is expressed as the ratio of the bending force applied to the specimen when it is destroyed to the modulus of rupture at the fracture point. 4.Instruments and Equipment 4.1 Compression strength testing machine. The pressure when the sample is fully crushed is between 10% and 90% of the testing machine's range. The relative error of the testing machine is not large. One of the pressure plates is equipped with a spherical seat, which can compensate for the slight deviation of the parallelism between the pressure surface of the specimen and the pressure plate. 4.2 Bending strength testing machine. relative error is not more than 1%, capable of constant speed loading, loading and support blade diameter is 10mm±0.1mm. 4.3 Vernier caliper. accuracy is 0.02mm. 4.4 Oven. capable of maintaining heat at 110℃±5℃. 4.5 Drying dish. 4.6 Balance. accuracy is 0.1g. 5.Samples 5.1 Compressive strength test specimen 5.1.1 10 cylindrical specimens, diameter (d) 20 mm ± 2 mm, length (L) 20 mm ± 2 mm [diameter d of the stoneware specimen is 50mm±5mm, length (L) is 50mm±5mm]. 5.1.2 The preparation of the test specimens shall adopt the same process as that used in the actual production of the material. 5.1.3 The specimen is processed to a point where the non-parallelism between the two bottom surfaces is less than 0.1 mm/mm and the non-perpendicularity between the generatrix and the bottom surface is less than 1°. 5.1.4 The specimen should be free of obvious defects and have a clean surface. ......

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