GB/T 21862 "Determination of density of paints and varnishes" is divided into 4 parts, and this part is the 5th part of GB/T 21862. This part is published for the first time. This part specifies the method for determining the density of paints, varnishes and related products by hydrometer method. This part is applicable to the density determination of raw materials for manufacturing paints, varnishes and liquids and transparent bodies. This part is equivalent to NF30-028:1989 "Determination of density of paints and varnishes by hydrometer method" (French version). GB/T 21862.5-2008 Determination of density of paints and varnishes Part 5: Hydrometer method GB/T21862.5-2008 Standard download decompression password: www.bzxz.net
GB/T 21862 "Determination of density of paints and varnishes" is divided into 4 parts, and this part is the 5th part of GB/T 21862. This part is published for the first time. This part specifies the method for determining the density of paints, varnishes and related products by hydrometer. This part is applicable to the determination of density of raw materials for the manufacture of paints, varnishes and liquids and transparent bodies. This part adopts NFT30-028:1989 "Determination of density of paints and varnishes by hydrometer" (French version).
GB/T21862 "Determination of density of paints and varnishes" consists of the following 4 parts:
---Part 2: Falling ball method;
---Part 3: Vibration method;
---Part 4: Cup pressure method;
---Part 5: Hydrometer method. This part
is Part 5 of GB/T21862.
This part adopts NFT30-028:1989 "Determination of density of paints and varnishes by hydrometer" (French version).
GB/T21862 "Determination of density of paints and varnishes" related standards: GB/T6750-2007 "Determination of density of paints and varnishes - Pycnometer method" (ISO2811?1:1997, IDT).
This part is proposed and managed by the National Technical Committee for Standardization of Dangerous Chemicals Management (SAC/TC251).
The responsible drafting unit of this part: Jiangsu Entry-Exit Inspection and Quarantine Bureau. ||tt ||
Participating drafting units of this part: Sinochem Chemical Standardization Research Institute, Marine Chemical Research Institute, Changzhou Paint Chemical Research Institute of China National Chemical Construction Corporation.
Main drafters of this part: Wang Rong, Mei Jian, Jiang Hongxing, Mao Leilei, Song Jie, Kou Haijuan, Zhao Ling. This part
is published for the first time.
The provisions in the following documents become the provisions of this part through reference in this part of GB/T21862. For dated references, all subsequent amendments (excluding errata) or revisions are not applicable to this standard. However, parties to agreements based on this standard are encouraged to investigate whether the latest versions of these documents can be used. For undated references, the latest versions apply to this standard.
NFB35-302 Glass products and test related equipment Cylindrical scale test tubes
NFB35-502 Glass products and test related equipment Stem precision thermometers
NFB35-510 Glass products and test related equipment Liquid hydrometers, construction principles and standardization principles
NFT30-048 Sampling methods for paints (paints, varnishes, similar preparations and their raw materials)
NFT30-058 Tests of paints under normal conditions and tests under specified conditions

ICs 13. 300
National Standard of the People's Republic of China
GB/F21862.5—2008
Paints and varnishes-Determination of the density-Part 5:Areometer method
Promulgated on 2008-05-12
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China Administration of Standardization of the People's Republic of China
Implementation on 2008-09-01
GB/T 21862 "Paints and varnishes-Determination of the density" consists of the following 4 parts: Part 2: Falling ball method;
Part 3·Vibration method,
Part 4·Cup pressure method;
Part 5: Areometer method.
This part is part 5 of GB/T 21862. GB/T 21862.5--2008
This part adopts NFT31-028:1989 "Determination of density of paints and varnishes - Hydrometer method" (French version), GB/T21862 "Determination of density of paints and varnishes" related standards: GB/T6750-2007 "Determination of density of paints and varnishes - Hydrometer method" (ISO2811-1:1997.IDT). This part is proposed and approved by the National Technical Committee for the Administration of Dangerous Chemicals (SAC/TC251). The responsible unit for the reform of this part: Jiangsu Exit-Entry Inspection and Quarantine Bureau. Participating drafting units of this part: China National Chemical Standardization Research Institute, Marine Chemical Research Institute, China National Chemical Construction Corporation Changzhou Coatings Chemical Research Institute
Main drafters of this part: Wang Ju, Mei Jian, Jiang Hongxing, Mao Tixu, Song Jie, Kou Haijuan, Zhao Ling. This part is published for the first time.
1 Scope
Paints and varnishes
Determination of density
Part 5: Hydrometer method
This part specifies the method for determining the density of paints, varnishes and related products by hydrometer method. This part is applicable to the density determination of raw materials for the manufacture of paints, varnishes and liquids and transparent bodies. 2 Normative references
GB/T 21862.5—2008
The following documents have become part of this part through reference in this part of GB/T 21862. For any cited document of the date mentioned, all subsequent amendments (excluding corrigenda) or revisions shall not apply to the parties to the agreement. The latest technical versions of these documents may be used.
NF R 35-302
NF 3 35-502
NF B35-510
NF T 30 048
NF T 30-058
3 Principle
Glassware and related test equipment
Glassware and related verification equipment
Existing glassware and related test equipmentbZxz.net
All undated references
Cylindrical scale test tubes
Rod-shaped refined sulfur thermometers
are encouraged to be based on this part of the method
and the latest edition is applicable to this part
Liquid hydrometer, construction principles and standardization PRESS
Paint sampling method (paints, varnishes, similar preparations and their raw materials) Paint test under normal environment and specified conditions The hydrometer method is based on the Archimedean principle. When the hydrometer is immersed in liquid, it displaces part of the volume and is in the state of being equal to the displacement from bottom to top. At this time, the density of the product is the force of the weight of the liquid. When the weight of the displaced liquid equals the weight of the hydrometer itself, the hydrometer is at equilibrium and can be read directly from the hydrometer.
4 Instruments
4.1 Hydrometer
The following hydrometers may be used for the determination of liquid density: 4.1.1
M10008000900NFB35-510;
M10009001000VFB35-510:
c) M_0C: 0C0 1 100 NF B 35-510.OF
4.1.2 When the density of the liquid is outside the range of 8 g/mL to 1 g/ml, a hydrometer of equivalent accuracy shall be used. 4.2 The inner diameter of the test tube shall be less than the outer diameter of the hydrometer and its height shall be such that the bottom of the hydrometer is at least 25 mm away from the bottom of the test tube (see NFB35302).
4.3 Thermometer
The accuracy shall meet the requirements of STI./0.2/15/45, NF B 35 502. 5 Sample preparation
5.1 Sampling shall be carried out in accordance with the provisions of NF T 30-048. 5.2 The sample volume shall be sufficient for three tests. Note: When sampling, avoid injecting products containing bubbles and suspended matter into the test tube. GB/T 21862.5—2008
6 Test steps
6.1 Before the test, place the hydrometer, the sealed vial containing the sample and the test tube in a room or thermostat for about 2 hours. The temperature must be constant at 23'℃±1℃.
6.2 Pour the processed sample into the test tube, let the bubbles in the sample slowly rise to the surface, measure its temperature and then pour it into the hydrometer.
6.3 After the sample is still in the hydrometer, read the value according to the meniscus of the liquid surface, accurate to 0.005 g/mL. 7 Conclusion
7.1 Read the value of the hydrometer according to three tests and average it. The reading accuracy is 0.005 at this time. The average value of mass density is accurate to 0.01.
7.2 When the measurement temperature is between 15℃ and 25℃, the measured density needs to be corrected. When the measurement temperature exceeds 23℃, the density decreases by 0.007 g/ml for every 1℃ increase in temperature. When the measurement temperature is less than 23℃, the density increases by 0.007 g/mL for every 1℃ decrease in temperature. Test report
The test report should include the following aspects: a) the nature of the tested product; h) indicate the standard number of this part;
actual test temperature:
actual test results;
various factors that may affect the test results; test date.
Art references
Mass density of petroleum products - wave level method, NF T 60-101
Petroleum products
NF ISO 6883
GB/T21862.5--2008
Determination of mass density of animal fats and plants in air (index level: T60-214)GB/T 21862.5-2008
National Standard of the People's Republic of China
Determination of density of paints and varnishes
Part 5: Hydrometer method
GR/T 21862. 5—2008
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