GB/T 21782.2-2008 English PDF

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GB/T 21782.2-2008: Coating powders -- Part 2: Determination of density by gas comparison pycnometer (referee method)
Status: Valid

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 21782.2-2008	114	Add to Cart	3 days	Coating powders -- Part 2: Determination of density by gas comparison pycnometer (referee method)	Valid

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Basic data

Standard ID: GB/T 21782.2-2008 (GB/T21782.2-2008)
Description (Translated English): Coating powders -- Part 2: Determination of density by gas comparison pycnometer (referee method)
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: A80
Classification of International Standard: 13.300
Word Count Estimation: 6,623
Date of Issue: 2008-05-12
Date of Implementation: 2008-09-01
Quoted Standard: GB/T 3186-2006; GB/T 21782.3-2008
Adopted Standard: ISO 8130-2-1992, IDT
Issuing agency(ies): General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China
Summary: This standard specifies the comparison with a gas analyzer to determine the proportion of the density of the powder coating method. This method is applicable to all types of powder coatings, the test is very simple, but the density used in the test method, the apparatus requires complicated law. The density of the powder coating can also be used GB/T 21782. 3-2008 in the liquid displacement pycnometer method. This method is relatively simple instrument, but the liquid displacement pycnometer method is easy to get wrong results. In particular, the following two situations: First, the substitution occurs used powder coating liquid contact after the powder coating swelling, Second, not all replacement fluid displaces the air between the powder coating particles. Pycnometer liquid displacement measurement method is slower, accuracy is low, only it can be compared with the gas specific gravity meter method when the same result can be used.

GB/T 21782.2-2008: Coating powders -- Part 2: Determination of density by gas comparison pycnometer (referee method)

---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.
Coating powders Part 2. Determination of density by gas comparison pyknometer (referee method) ICS 13.300 A80 National Standards of People's Republic of China GB/T 21782.2-2008/ISO 8130-2.1992 Powder Coatings Part 2. Determination of the density of gas specific gravity meter comparative law (Arbitration Act) (ISO 8130-2.1992, IDT) Posted 2008-05-12 2008-09-01 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China released

Foreword

GB/T 21782 "powder coating" is divided into 14 parts, the structure and corresponding international standards are as follows. --- Part 1. Determination of particle size distribution by sieving (ISO 8130-1.1992, IDT); --- Part 2. Determination of density (Arbitration Act) compare the proportion of gas meter method (ISO 8130-2.1992, IDT); --- Part 3. Determination of liquid displacement pycnometer density (ISO 8130-3.1992, IDT); --- Part 4. Calculation of lower explosive limit (ISO 8130-4.1992, IDT); --- Part 5. Powder/air mixture Determination of flow characteristics (ISO 8130-5.1992, IDT); Measured at a given temperature thermosetting powder coating of gel time (ISO 8130-6..1992, IDT) --- Part 6; --- Part 7. Determination (ISO 8130-7.1992, IDT) mass loss during baking; --- Part 8. Evaluation of the storage stability of thermosetting powders (ISO 8130-8.1994, IDT); --- Part 9. Sampling (ISO 8130-9.1992, IDT); --- Part 10. Determination of deposition efficiency (ISO 8130-10.1998, IDT); --- Part 11. ramp flow test (ISO 8130-11.1997, IDT); --- Part 12. Determination of compatibility (ISO 8130-12.1998, IDT); --- Part 13. Laser diffraction particle size analysis (ISO 8130-13.2001, IDT); --- Part 14. Terminology (ISO 8130-14.2004, IDT). This is Part 2 GB/T 21782 of. This part identical with ISO 8130-2.1992 "powder coatings Part 2. Comparison of the proportion of instrument gas density determination (Arbitration Act)." (In English). For ease of use, ISO 8130-2.1992 to do this part of the main editorial changes are. --- With "GB/T 3186-2006 Paints, varnishes and raw materials for paints and varnishes - Sampling (ISO 15528.2000, IDT)" instead of "ISO 842. 1984 Paints and varnishes - Sampling of raw materials" (ISO 842. 1984 has been canceled, the ISO 15528.2000 Generation for); --- Increase in the normative references cited GB/T 21782.3-2008; "." --- With a decimal point instead of a comma as the decimal point, ""; --- Delete international standards foreword. This part of the National Chemicals Management Standardization Technical Committee dangerous (SAC/TC251) and focal points. Drafting this Part. Guangdong CIQ, in the construction of Changzhou coating Chemical Research Institute, Marine Chemicals Research Institute, the Chemical Standardization Institute, Hubei Exit Inspection and Quarantine. The main drafters of this section. Chengu Feng, Chen Wenjie, Chen Qiang, Zhou Wei, Di Cuiping, Jian-Guo Zheng, Liang Meiqiong, Shen Jiang Su Qian Ye Miao, Cui Hairong, Liqing Xiang. This section first release. GB/T 21782.2-2008/ISO 8130-2.1992 Powder Coatings Part 2. Determination of the density of gas specific gravity meter comparative law (Arbitration Act)

1 Scope

This section GB/T 21782 specifies the method of comparison with a gas analyzer to determine the proportion of the powder coating density. This method is applicable to all Powder coating systems, test is very simple, but compared with the commonly used methods for testing the density, complex equipment requirements of this Law. The density of the powder coating can also be used GB/T 21782.3-2008 liquid in the replacement Pycnometer method. The law instrument relative Simple, but liquid displacement pyknometer method easy to get the wrong result. In particular, the following two situations. First appeared substitution liquid used in contact After powder coating, powder coating swelling; the second is the replacement liquid can not displace all the air between the particles of the powder coating. Liquid displacement gravity Flask method measuring speed is slow, low accuracy, it can only get the same results with the gas comparison method when the proportion of instrument can be used.

2 Normative references

The following documents contain provisions which, through reference GB/T 21782 in this section constitute provisions of this section. For dated reference documents Member, all subsequent amendments (not including errata content) or revisions do not apply to this section, however, encouraged to reach under this section Parties to research agreement to use the latest versions of these documents. For undated reference documents, the latest versions apply to this section. GB/T 3186-2006 Paints, varnishes and raw materials for paints and varnishes - Sampling (ISO 15528.2000, IDT) GB/T 21782.3-2008 powder coatings - Part 3. Determination of liquid displacement pycnometer density (ISO 8130-3.1992, IDT) Principle 3 When the sample is added to the assay vessel by measuring the gas volume being replaced vessel to measure the volume of the sample has been weighed. balance By the pressure caused by gas replacement, in order to obtain the volume of gas to be replaced. Density is then calculated from the mass and volume of the sample.

4 Materials

4.1 air If required, the use of helium, storage cylinders, industrial grade. If the test product is not affected, and the test reports indicate the deviation of the method, you can use other gases.

5 Instruments

5.1 Comparison of the proportion of gas meter For manual or automatic determination of density, shall meet the following requirements. Using air as the medium of a typical gas meter compare the proportion of the basic design shown in Figure 1. It is composed of two living with exactly equal size Plug cylinder (A and B). Between valves and cylinders are connected by a differential pressure gauge. Mounted in 50mL beaker B sample is placed in the cylinder. Two A piston movement range, etc., with the result that the pressure difference is formed between the cylinder A and B. Then move the measuring piston cylinder B regain Isobaric. Read the resulting change in volume, namely the volume of the sample from the scale. Measured cylinder ventilation capacity should prove within 0.5% (relative value) range are equal. On the scale indicates the measured volume of the interval should not Measuring more than 1% by volume. Scale correction should be carried out by placing in a known volume of the instrument and the tracers have the ability to reference standards. GB/T 21782.2-2008/ISO 8130-2.1992 ......

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