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GB/T 9966.5-2020: Test methods for natural stone - Part 5: Determination of hardness
Status: Valid GB/T 9966.5: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 9966.5-2020 | English | 119 |
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Test methods for natural stone - Part 5: Determination of hardness
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GB/T 9966.5-2020
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| GB/T 9966.5-2001 | English | 239 |
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Test methods for natural facing stones -- Part 5: Test method for shore hardness
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GB/T 9966.5-2001
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| GB/T 9966.5-1988 | English | 199 |
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Test methods for natural facing stones--Test method for specular gloss
| Obsolete |
GB/T 9966.5-1988
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PDF similar to GB/T 9966.5-2020
Basic data | Standard ID | GB/T 9966.5-2020 (GB/T9966.5-2020) | | Description (Translated English) | Test methods for natural stone - Part 5: Determination of hardness | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | Q21 | | Classification of International Standard | 91.100.15 | | Word Count Estimation | 6,625 | | Date of Issue | 2020-03-06 | | Date of Implementation | 2021-02-01 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 9966.5-2020: Test methods for natural stone - Part 5: Determination of hardness---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.
Test methods for natural stone--Part 5. Determination of hardness
ICS 91.100.15
Q21
National Standards of People's Republic of China
Replaces GB/T 9966.5-2001
Test methods for natural stone
Part 5. Hardness test
2020-03-06 release
2021-02-01 implementation
State Administration of Market Supervision
Published by the National Standardization Administration
Foreword
GB/T 9966 "Test Methods for Natural Stone" is divided into 18 parts.
--- Part 1. Compression strength test after drying, water saturation and freeze-thaw cycles;
--- Part 2. Bending strength test after drying, water saturation, freeze-thaw cycles;
--- Part 3. Water absorption, bulk density, true density, true porosity test;
--- Part 4. Wear resistance test;
--- Part 5. Hardness test;
--- Part 6. acid resistance test;
--- Part 7. Hanging strength test of stone pendant combination unit;
--- Part 8. Testing the structural strength of stone mounting systems with uniform static pressure difference;
--- Part 9. (by measuring the fundamental frequency of resonance) determine the dynamic elastic modulus;
--- Part 10. Determination of seismic performance of pendant combination units;
--- Part 11. Determination of accelerated aging intensity by chilling and heat;
--- Part 12. Determination of static elastic modulus;
--- Part 13. Determination of capillary water absorption coefficient;
--- Part 14. Determination of resistance to fracture energy;
--- Part 15. Determination of aging resistance to salt spray;
--- Part 16. Determination of the linear thermal expansion coefficient;
--- Part 17. Determination of salt crystal strength;
--- Part 18. Lithofacies analysis.
This part is Part 5 of GB/T 9966.
This section is drafted in accordance with the rules given in GB/T 1.1-2009.
This section replaces GB/T 9966.5-2001 "Test methods for natural facing stone-Part 5. Shore hardness test method". Headquarters
Compared with GB/T 9966.5-2001, in addition to editorial changes, the main technical changes are as follows.
--- Added normative references (see Chapter 2);
--- Increased the content of the Mohs hardness test method (see Chapter 3);
--- The sample drying is changed from 105 ℃ ± 2 ℃ for 24h to 65 ℃ ± 5 ℃ for 48h (see 4.2.3, 4.4.1,.2001 version)
3.3, 5.1);
--- Removed the requirement for the gloss value of the sample (see 4.3 in the.2001 edition);
--- Added part of the test report (see Chapter 5, Chapter 7 of the.2001 edition).
This section is proposed by China Building Materials Federation.
This section is under the jurisdiction of the National Stone Standardization Technical Committee (SAC/TC460).
This section was drafted. Sinoma Artificial Crystal Research Institute Co., Ltd., Beijing Sinoma Artificial Crystal Research Institute Co., Ltd., Universal Stone (Fu
Construction) Co., Ltd.
The main drafters of this section. Zhou Junxing, Yu Quan, Gong Yue, Li Wenhong, Liu Wuqiang, Huang Yong.
The previous versions of the standards replaced by this section are.
--- GB/T 9966.5-1988, GB/T 9966.5-2001.
Test methods for natural stone
Part 5. Hardness test
1 Scope
This part of GB/T 9966 specifies the principles, instruments and equipment, test samples, test procedures and test results of natural stone hardness testing
And test report.
This section applies to the determination of the hardness of natural stone.
2 Normative references
The following documents are essential for the application of this document. For dated references, only the dated version applies to this article
Pieces. For undated references, the latest version (including all amendments) applies to this document.
GB/T 17670 unified number of natural stone
3 Mohs hardness
3.1 Principle
Ten kinds of ore were selected as the hardness standard, and the hardness was divided into 10 grades according to the order of hardness (see Table 1) to produce obvious scratches on the sample.
The standard minimum grade is the relative hardness of the sample.
3.2 Equipment
Mohs hardness tester. 10 kinds of hardness standard minerals, see Table 1.
Table 1 Mohs hardness table
Hardness grade 1 2 3 4 5 6 7 8 9 10
Ore Name Talc Gypsum Calcite Fluorite Apatite Orthoclase Quartz Topaz Corundum Diamond
3.3 Test samples
Three specimens with a length and width of 100mm × 100mm, in which the test surface should be polished into a mirror or fine surface.
3.4 Test procedure
Place the sample on a solid, stable support with the facing up. Use different standard scratched ore from small to large.
A new cutting edge of the standard scratch ore was used to scribe the surface of the sample vertically. Hold the standard scratch ore while scoring without wrist
Move, take the hand holding the standard scratched ore with the translation of the arm, until a clear single-line engraved scratch appears on the surface of the sample. Test
The applied force should be moderate, and the edge of the standard scratch ore should not be broken due to excessive force to form double-line or even multi-line scribe marks. Every
The sample was scratched four times, and the surface of the sample was scratched visually.The minimum standard hardness level that produced obvious scratches on the sample was used as the sample.
Moh's hardness.
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