GB/T 21782 "Powder coatings" is divided into 14 parts, this part is the 4th part of GB/T 21782. This part is published for the first time. This standard specifies a calculation method for the lower explosion limit of powder coatings. When calculating, it is necessary to be based on the total calorific value of the product measured by ISO 1928:1995, or based on the total calorific value of each component of the product. This part is equivalent to the international standard ISO8130-4:1992 "Powder coatings Part 4: Calculation of the lower explosion limit" (English version), including its technical corrigendum ISO8130-4:1992 TECHNICAL CORRIGENDUUM 1. GB/T 21782.4-2008 Powder coatings Part 4: Calculation of lower explosion limit GB/T21782.4-2008 standard download decompression password: www.bzxz.net
GB/T 21782 "Powder coatings" is divided into 14 parts, this part is the 4th part of GB/T 21782. This part is published for the first time. This standard specifies a calculation method for the lower explosion limit of powder coatings. When calculating, it is necessary to be based on the total calorific value of the product measured by ISO 1928:1995, or based on the total calorific value of each component of the product. This part is equivalent to the international standard ISO8130-4:1992 "Powder coatings Part 4: Calculation of lower explosion limit" (English version), including its technical corrigendum ISO8130-4:1992 TECHNICAL CORRIGENDUUM 1.
class="f14" style="padding-top:10px; padding-left:12px; padding-bottom:10px;"> GB/T21782 "Powder Coatings" is divided into 14 parts. The structure and its corresponding international standards are as follows:
---Part 1: Determination of particle size distribution by sieving method (ISO8130-1:1992, IDT);
---Part 2: Determination of density by gas comparison pycnometer method (arbitration method) (ISO8130-2:1992, IDT);
---Part 3: Determination of density by liquid displacement pycnometer method (ISO8130-3:1992, IDT);
---Part 4: Calculation of lower explosion limit (ISO8130-4:1992, IDT);
---Part 5: Determination of the flow properties of powder/air mixtures (ISO 8130-5:1992, IDT);
---Part 6: Determination of the gel time of thermosetting powder coatings at a given temperature (ISO 8130-6:1992, IDT);
---Part 7: Determination of mass loss on baking (ISO 8130-7:1992, IDT);
---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: Inclined plane flow test (ISO8130-11:1997, IDT);
---Part 12: Determination of compatibility (ISO8130-12:1998, IDT);
---Part 13: Particle size analysis by laser diffraction (ISO8130-13:2001, IDT);
---Part 14: Terminology (ISO8130-14:2004, IDT). This
part is Part 4 of GB/T 21782.
This part is equivalent to the international standard ISO8130-4:1992 "Powder coatings Part 4: Calculation of lower explosion limit" (English version), including its technical corrigendum ISO8130-4:1992 TECHNICAL CORRIGENDUM 1.
Compared with ISO81304:1992, the following editorial changes have been made to this part:
--- Replace ISO842:1984 Sampling of raw materials for paints and varnishes (ISO842:1984 has been obsoleted and replaced by ISO15528:2000) with GB/T3186-2006 Paints, varnishes and raw materials for paints and varnishes (ISO15528:2000, IDT);
--- Replace the comma as a decimal point with a decimal point.;
--- Delete the foreword of the international standard.
This part was proposed and managed by the National Technical Committee for Standardization of Dangerous Chemicals Management (SAC/TC251).
The main drafting organizations of this part are: Guangdong Entry-Exit Inspection and Quarantine Bureau, Sinochem Changzhou Paint Chemical Research Institute, Marine Chemical Research Institute, Sinochem Chemical Standardization Institute, and Hubei Entry-Exit Inspection and Quarantine Bureau.
The main drafters of this part are Mo Man, Liu Jianbin, Li Zhengjun, Wang Xiaobing, Zhong Zhiguang, Zhai Cuiping, Peng Subiao, Shen Sujiang, Mao Leilei, Lin Yanfei and Li Qingxiang. This part
is published for the first time.

The clauses in the following documents become the clauses of this part through reference in this part of GB/T 21782. For any dated referenced document, all subsequent amendments (excluding errata) or revisions are not applicable to this part. However, the parties to an agreement based on this part are encouraged to study whether the latest versions of these documents can be used. For any undated referenced document, the latest version shall apply to this part.
GB/T3186-2006 Sampling of paints, varnishes and raw materials for paints and varnishes (ISO15528:2000, IDT)
ISO1928:1995 Determination of gross calorific value and calculation of net calorific value of solid mineral fuels by bomb calorimeter
ISO6184-1:1985 Explosion suppression systems Part 1: Determination of the explosion index of combustible dust in air

ICS13.300
National Standard of the People's Republic of China
GB/T 21782.4—2008/1SO 8130-4:1992 Powder coatings
Part 4: Calculation of lower explosion limit
Coating powders
Part 4: Calculation of lower explosion limit(ISO8130-4:1992,IDT)
Published on 2008-05-12
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China Standardization Administration of China
Implementation on 2008-09-01
GB/T21782.4-2008/1SO8130-4:1992GB/T21782 "Powder coatings" is divided into 14 parts, the structure and its corresponding international standards are as follows Part 1: Determination of particle size distribution by sieving (ISO8130-1:1992, [DT]); Part 2: Determination of density by gas comparison pycnometer (arbitration method) (ISO8130-2:1992, IDT); Part 3: Determination of density by liquid displacement pycnometer (ISO8130-3:1992, IDT); Part 4: Calculation of lower explosion limit (ISO8130-4:1992, IDT): Part 5: Determination of flow characteristics of powder/air mixtures (ISO8130-5: 1992, IDT); Part 6: Determination of gelling time of thermosetting powder wood coatings at a given temperature (ISO8130-6: 1992.IDT); Part 7: Determination of mass loss during baking (ISO8130-7: 1992, 1DT); Part 8: Evaluation of storage stability of thermosetting powders (ISO8130-8: 1994, IDI); Part 9: Sampling (ISO8130-9: 1992, IDT); Part 10: Determination of deposition efficiency (ISO8130-10.1998IDT): - Part 11: Inclined plane flow test (ISO8130-11:1997IDT); - Part 12: Determination of compatibility (ISO8130-12:1998, IDT); Part 13: Particle size analysis by laser diffraction (ISO8130-13:2001, IDT); Part 14: Terminology (ISO8130-14:2004, IDT). This part is Part 4 of CB/T21782. This part is equivalent to the international standard ISO8130-4:1992 "Powder coatings Part 4: Calculation of lower explosion limit" (English version), including its technical corrigendum ISO8130-4:1992TECHNICALCORRIGENDUM1. Compared with IS08130-1:1992, this part has made the following editorial changes: - GB/T3186-2006 Sampling of paints, varnishes and raw materials for paints and varnishes (IS015528:2000, IDT)\ replaces "ISO842:1984 Sampling of raw materials for paints and varnishes\ (ISO842:1984 has been obsolete and replaced by ISO15528:2000);
replace the logical sign ", " as a decimal point with a decimal point \\; delete the foreword of the international standard.
This part was proposed and managed by the Standardization Technical Committee for Dangerous Chemicals Management of Jinguo (SAC/TC251). The main drafting units of this part are: Guangdong Exit-Entry Inspection and Quarantine Bureau, Sinochem Changzhou Paint Chemical Research Institute, Marine Chemical Research Institute, Sinochem Chemical Standardization Institute, Hubei Exit-Entry Inspection and Quarantine Bureau. This part Main drafters: Mo Man, Liu Jianbin, Li Zhengmou, Wang Xiaobing, Zhong Zhiguang, Zhai Cuiping, Peng Subiao, Shen Sujiang, Mao Leilei, Lin Lifei, Li Qingxiang.
This part is published for the first time.
1 Scope
Powder coatings
GB/T21782.4—2008/ISO8130-4:1992 Part 4: Calculation of lower explosion limit
This part of CB/T21782 specifies a method for calculating the explosion limit of powder coatings, that is, the minimum concentration of powder coating dust in the air that can form an explosive mixture. The calculation is based on the total calorific value of the product measured by ISO1928:1995, or the total calorific value of each component of the base product.
In order to obtain reliable measurement data, a special instrument is required to determine the explosion index of combustible dust in the air. This method is used in It is described in ISO6184-1:1985. However, this instrument is not easy to obtain, and the method is very complicated. It not only requires professional knowledge, but also has a relatively high cost. Experience has shown that the lower explosion limit obtained by this calculation method is still satisfactory when applied in paint workplaces. Note 1: If it is a non-combustible powder paint such as vinyl chloride, this method can still obtain a lower explosion limit in air. Therefore, it can effectively avoid underestimation of any explosion hazard. Note 2: The calculation method used in this section is based on the following assumptions: a) The material should be a molecular dispersion; b) It should be a material that can be completely burned and can reach the highest oxidation state; c) The reaction should be adiabatic; d) When the minimum explosive concentration is reached in the air, the combustion temperature of the component is 1000°C. 2 Normative references
The clauses of the listed documents become the clauses of this part through the reference of this part of GB/T 21782. For the dated referenced documents, all the subsequent amendments (excluding errata) or revisions are not applicable to this part. However, the parties to the agreement based on this part are encouraged to study whether the latest versions of these documents can be used. For the undated referenced documents, the latest versions are applicable to this part.
GB/T 3186-2006 Sampling of paints, varnishes and raw materials for paints and varnishes (1SO15528: 2000, IDT) 1SO1928: 1995 Determination of gross calorific value and calculation of net calorific value of solid mineral fuels by bomb calorimeter IS06184-1: 1985 Explosion suppression systems Part: Determination of explosion index of combustible dust in air 3 Terms and definitions
The following terms and definitions apply to this part. 3. 1
lower explosion limitlower explosion limit
The lower explosion limit refers to the concentration of powder coating in the mixture of powder coating and air below a certain value, and no flame explosion will occur. This concentration is the "lower explosion limit" and is expressed in grams per cubic meter. 4 Sampling
Draw representative samples of the test product in accordance with the provisions of GB/T31862006. 5 Determination of gross calorific value
The gross calorific value H of the test product can be determined according to the method described in ISO1928:1995. Or, according to the requirements of Chapter 6 of this part, calculate the sum of the gross calorific values ​​of the inter-combustible components of the product. 1
GB/T 21782.4—2008/1SO 8130-4: 19926 Calculation of the lower explosion limit
Calculate the gross calorific value H of the test product.
The total calorific value of each combustible component is multiplied by the mass fraction of the component in 1g of product, and the sum is calculated. The value H is obtained by formula (1)::
Where:
is the number of combustible components;
c\-the mass fraction of the i-th component;
II-the total calorific value of the i-th component, in joules per gram (J/g). The lower explosion limit C is calculated by formula (2):
Wu City;
C-the minimum concentration of powder coating explosion in air, in grams per cubic meter (g/m\); A-constant, equal to -2.5g/m;
band number, equal to 1.2 4×10J/m;
The total calorific value of powder coatings, in joules (J/g). H.—
The report results are rounded to the integer,
Test report
The test report shall include at least the following information:
a) All necessary details to identify the tested product; b)
Indicate the number of this part:
Test results specified in Chapter 6;
Any differences from the specified test methods; Test date.
GB/T 21782.4-2008
People's Republic of ChinabZxz.net
National Standard
Powder coatings
Part 4: Calculation of lower explosion limit
GB/T 21782.4—2008/1SO 8130-4:1992*
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