Some standard content:
Chemical Industry Standard of the People's Republic of China
Industrial Sodium Hexametaphosphate
1 Subject Content and Scope of Application
HG/T 2519-93
This standard specifies the technical requirements, test methods, inspection rules, and marking, packaging, transportation, and storage of industrial sodium hexametaphosphate (also known as sodium hexametaphosphate).
This standard applies to industrial sodium hexametaphosphate. This product is mainly used as an adhesive, flotation agent, dispersant, etc. Molecular formula: (NaPO.),
2 Reference standards
GB/T 601
GB/T 602
Preparation of standard solution for titration analysis (volume analysis) of chemical reagents Preparation of standard solution for determination of impurities of chemical reagents GB/T603 Preparation of preparations and products used in test methods of chemical reagents Methods of expressing and determining limit values GB1250
GB/T 3049
General method for determination of iron content in chemical products General rules for sampling of chemical products
GB/T 6678
GB/T6682 Specifications and test methods for water used in analytical laboratories GB8947 Composite plastic woven bags
3 Technical requirements
3.1 Appearance: white powder or granules.
2 Industrial sodium hexametaphosphate should meet the requirements of the following table. 3.2
Total phosphate (as P:0,) content, %
Inactive phosphate (as P,Os) content, %Water-insoluble matter content, %
Iron (Fe) content, %
pH (10g/L)
Solubility
4 Test method
O-phenanthroline spectrophotometry
Qualified products
The reagents and water used in this standard, unless otherwise specified, refer to analytical pure reagents and grade 3 water specified in GB/T6682. Approved by the Ministry of Chemical Industry of the People's Republic of China on September 8, 19931
Implemented on July 1, 1994
HG/T2519-93
Standard solutions, impurity standard solutions, preparations and products required in the test shall be prepared in accordance with the provisions of GB/T601, GB/T602 and GB/T603 unless otherwise specified. 4.1 Determination of total phosphate content
4.1.1 Summary of the method
The sample is completely hydrolyzed into orthophosphate in an acidic solution, and quinoline phosphomolybdic acid precipitate is generated after adding quinoline molybdate solution, which is filtered, washed, dried and weighed.
4.1.2 Reagents and materials
4.1.2.1 Nitric acid (GB/T626) solution: 1+1;4.1.2.2 Quinoline molybdate solution
Preparation method:
Solution 1: Weigh 70g sodium molybdate (HG3-1087) and dissolve it in 150mL water; Solution II: Weigh 60g citric acid (GB/T9855) and dissolve it in a mixture of 85mL nitric acid (GB/T626) and 150mL water; Solution II: Weigh 5mL azole and dissolve it in a mixture of 35mL nitric acid (GB/T626) and 100mL water. Under constant stirring, first slowly add solution I to the solution, then slowly add the solution to solution II and mix well. Leave it for 24h and filter. Add 280mL acetone (GB/T686) to the filtrate, dilute it to 1000mL with water and mix well. Store in colored glass bottles or polyethylene bottles.
4.1.3 Instruments and equipment
4.1.3.1 Wafer filter: filter plate pore size 5~15μm. 4.1.4 Analysis steps
4.1.4.1 Preparation of test solution
Use a weighing bottle to weigh about 2g of the sample, accurate to 0.0002g. Place in a 100mL beaker. After adding water and dissolving at room temperature, transfer all to a 500mL volumetric flask, dilute with water to the scale, and shake well. Dry filter, the filtrate obtained is test solution A, which is used for the determination of total phosphate and inactive phosphate.
4.1.4.2 Determination
Use a pipette to transfer 15mL of test solution A, place in a 400mL tall beaker, add 15mL of nitric acid solution and 70mL of water. Heat to a slight boil for 15min. Add 50mL of quinoline molybdate solution while hot, keep the solution temperature at 75±5℃, and keep warm for 30s (do not use open flames or stir during the addition of reagents and heating to avoid lumps). Cool to room temperature and stir 3 to 4 times during cooling. Filter by pouring through a filter that has been dried to constant weight at 180±5℃ or 250±10℃. Wash the precipitate in a beaker 3 times, using 15mL of water each time. Transfer the precipitate to the filter and continue washing with water. The total amount of washing water used is about 150mL. Dry at 180±5℃ for 45min or at 250±10℃ for 30min. Cool in a desiccator and weigh. 4.1.4.3 Blank test
Replace test solution A with 15mL of water, and the rest of the operation is the same as in 4.1.4.2. 4.1.5 Expression of analysis results
The total phosphate (P2Os) content (X1) expressed as mass percentage is calculated according to formula (1): X = (ml=mo) × 0 032 07 × 100
106. 9 (ml - mo)
Wherein: m1
The mass of quinoline phosphomolybdic acid precipitate generated in the test solution, name; The mass of quinoline phosphomolybdic acid precipitate in the blank test, name; m—-The mass of the sample, g;
The coefficient for converting quinoline phosphomolybdic acid into phosphorus pentoxide. 0. 032 07-
4.1.6 Allowable difference
HG/T 2519 --- 93
The arithmetic mean of the parallel determination results is taken as the determination result. The absolute difference between the two parallel determination results shall not exceed 0.3%. 4.2 Determination of inactive phosphate content
4.2.1 Summary of the method
Add barium chloride solution to the test solution to form a precipitate with sodium hexamethaphosphate. Filter, add acid to the filtrate to hydrolyze the inactive phosphate into orthophosphate. Add quinomolybdic acid solution to form quinammonia phosphomolybdic acid precipitate. Filter, wash, dry and weigh. 4.2.2 Reagents and materials
Reagents and materials specified in Article 4.1.2
4.2.2.1 Chlorinated barium (GB/T652) solution: 250g/L. 4.2.3 Instruments and equipment
Same as Article 4.1.3.
4.2.4 Analysis steps
4.2.4.1 Determination
Use a pipette to transfer 50mL of test solution A into a 100mL volumetric flask. Add 30mL of barium chloride solution while stirring constantly. Shake thoroughly to allow complete precipitation. Dilute to scale with water, shake well, and dry filter. Use a pipette to transfer 50mL of filtrate into a 400mL tall beaker. Add 15mL of nitric acid solution and 35mL of water. Heat to a slight boil for 15min. Add 20mL of quinoline molybdate solution while hot. Keep the solution temperature at 75±5℃ and keep warm for 30s (open flames should not be used during the addition of reagents and heating, and stirring should not be allowed to prevent lumps). Cool to room temperature and stir 3 to 4 times during the cooling process. Filter by pouring through a crucible filter that has been dried to constant weight at 180±5℃ or 250±10℃ in advance. Wash the precipitate in a beaker three times, using 15 mL of water each time, transfer the precipitate to a crucible filter, and continue washing with water, using a total of about 150 mL of washing water. Dry at 180 ± 5°C for 45 min or at 250 ± 10°C for 30 min. Cool in a desiccator and weigh. 4.2.4.2 Blank test
Replace test solution A with 50 mL of water, and perform the same operations as in 4.2.4.1. 4.2.5 Expression of analysis results
The content of inactive phosphate (in terms of P2O,) expressed as mass percentage (X) is calculated according to formula (2): (ml = mo) × 0. 032 07 × 100X,
50×50
500×100
64.14(mi m.)
Wherein, m1--mass of quinoline phosphomolybdic acid precipitate generated in the test solution, g; mo--mass of quinoline phosphomolybdic acid precipitate in the blank test, g; m--mass of the sample, g;
0.03207--coefficient of converting quinoline phosphomolybdic acid into phosphorus pentoxide. 4.2.6 Allowable difference
The arithmetic mean of the parallel determination results is taken as the determination result. The absolute difference between the two parallel determination results shall not exceed 0.3%. 4.3 Determination of water-insoluble matter content
4.3.1 Instruments and equipment
4.3.1.1 Filter: filter plate pore size 5~15μm. 4.3.2 Analysis steps
Weigh about 30g of the ground sample to an accuracy of 0.01g. Place in a 400ml beaker, add 200ml water, heat to boiling to dissolve. Filter while hot with a dried constant weight crucible filter, wash with hot water 10 times, each time with 20ml water. Dry at 105-110℃ to constant weight.
4.3.3 Expression of analysis results
The water-insoluble content (X,) expressed as mass percentage is calculated according to formula (3): t
Where: ml——mass of crucible filter, g; HG/T2519
9—93
X, = m2
m2-—mass of water-insoluble matter and crucible filter, g;-mass of sample, g.
4.3.4 Allowable difference
ml×100
The arithmetic mean of the parallel determination results shall be taken as the determination result, and the absolute difference between the two parallel determination results shall not exceed 0.01%. 4.4 Determination of iron content
4.4.1 Summary of method
Same as Article 2 of GB/T3049.
4.4.2 Reagents and materials
Same as Article 3 of GB/T3049.
4.4.3 Instruments and equipment
Same as Article 4 of GB/T3049.
4.4.4 Drawing of working curve
According to Article 5.3 of GB/T3049, use a 3cm absorption cell and the corresponding amount of iron standard solution to draw the working curve. 4.4.5 Analysis steps
4.4.5.1 Preparation of test solution
(3)
Weigh about 2g of sample, accurate to 0.01g, and place in a 250mL beaker. Add 100mL of water and 10mL of (1+1) hydrochloric acid solution, heat to a slight boil for 15min. Cool, transfer all to a 250mL volumetric flask, dilute to the mark with water, and shake well. 4.4.5.2 Preparation of blank test solution
Add 100mL of water and 10mL of (1+1) hydrochloric acid solution to a 250mL beaker, heat to a slight boil for 15min. Cool. Transfer all to a 250mL volumetric flask, dilute to the mark with water, and shake well. 4.4.5.3 Determination
Use a pipette to take 10mL (5mL for qualified samples) of test solution and an equal volume of blank test solution, and place them in two 100mL volumetric flasks respectively. According to the provisions of Article 5.4 of GB/T3049, the operation shall be started from "add water to about 60 mL if necessary". 4.4.6 Expression of analysis results
The iron (Fe) content (X) expressed as mass percentage shall be calculated according to formula (4): X.
×1000
25(mj mo)
（4）
Wherein: m1—the mass of iron found from the working curve according to the absorbance of the tested test solution, mg; m. -the mass of iron found from the working curve according to the absorbance of the tested blank test solution, mg; m the mass of the sample, g;
V-—the volume of the test solution transferred, mL.
4.4.7 Allowable difference
The arithmetic mean of the parallel determination results shall be taken as the determination result. The absolute difference between the two parallel determination results shall not exceed 0.01%. 4.5 Determination of pH value
4.5.1 Instruments and equipment
4.5.1.1 Acidometer: graduation value 0.02 pH unit, equipped with saturated calomel electrode and glass electrode. 4.5.2 Analysis steps
Weigh 1.00±0.01g of sample, place it in a 250mL beaker, and dissolve it in 100mL of water without carbon dioxide. At room temperature, use an acidometer 501
HG/T2519-93
with a saturated calomel electrode as the reference electrode and a glass electrode as the measuring electrode to determine the pH value of the solution. 4.5.3 Allowable error
Take the arithmetic mean of the parallel determination results as the determination result. The absolute difference between the two parallel determination results shall not exceed 0.2 pH units. 4.6 Solubility test
4.6.1 Analysis steps
In a 250mL beaker, add 100mL of 10~~38℃ water, place it on an electromagnetic stirrer, and put in a stirrer with a length of 3.5~4.0cm. Add 5.0±0.1g of test material under stirring. The test material should be completely dissolved within 20min. 5 Inspection rules
5.1 Industrial sodium hexametaphosphate should be inspected by the quality supervision and inspection department of the manufacturer in accordance with the provisions of this standard. The manufacturer should ensure that all industrial sodium hexametaphosphate shipped out of the factory meets the requirements of this standard. Each batch of products shipped out of the factory should be accompanied by a quality certificate. The content includes: manufacturer name, product name, grade, net weight, batch number or production date, product quality certification that meets this standard and this standard number. 5.2 The user has the right to accept the industrial sodium hexametaphosphate received in accordance with the provisions of this standard. 5.3 Each batch of products shall not exceed 30t.
5.4 Determine the number of sampling units in accordance with the provisions of Article 6.6 of GB/T6678. When sampling, insert the sampler along the vertical center line to two-thirds of the depth of the material layer for sampling. The sample taken from each bag shall not be less than 100g. Mix the collected samples thoroughly, reduce them to about 500g by quartering, and immediately put them into two clean, dry wide-mouth bottles and seal them. Paste labels on the bottles, indicating: manufacturer name, product name, grade, batch number, sampling date and name of the sampler. One bottle is used for inspection and the other bottle is kept for three months for reference. 5.5 If one indicator of the inspection result does not meet the requirements of this standard, re-sampling should be carried out from twice the amount of packaging. If even one indicator of the inspection result does not meet the requirements of this standard, the entire batch of products cannot be accepted. 5.6 When the supply and demand parties have objections to the product quality, they shall be handled in accordance with the provisions of the "Interim Measures for National Product Quality Arbitration Inspection". 5.7 The rounded value comparison method specified in GB1250 shall be used to determine whether the inspection results meet the standards. 6 Marking, packaging, transportation and storage bZxz.net
6.1 The packaging of industrial sodium hexametaphosphate should be firmly and clearly marked, including: manufacturer name, product name, trademark, grade, net weight, batch number or production date, and this standard number. 6.2 Industrial sodium hexametaphosphate is packaged in composite plastic woven bags. The inner bag is a double-layer polyethylene film bag with a size of 880mm×500mm; the outer bag is a composite plastic woven bag with a size of 710mm×440mm. Its performance and inspection methods should comply with the relevant provisions of GB8947. The net weight of each bag is 25kg.
6.3 The inner bag of the package is tied with vinyl rope or other ropes of equivalent quality, or sealed with other equivalent methods. The outer bag is sewn with a bag sewing machine.
6.4 Industrial sodium hexametaphosphate should be covered during transportation to prevent sun and rain and avoid moisture. 6.5 Industrial sodium hexametaphosphate should be stored in a ventilated and dry warehouse. Additional Notes:
This standard was proposed by the Department of Science and Technology of the Ministry of Chemical Industry of the People's Republic of China. This standard is under the jurisdiction of Tianjin Chemical Research Institute of the Ministry of Chemical Industry. This standard was drafted by Chengdu Chemical Research and Design Institute and Tianjin Chemical Research Institute of the Ministry of Chemical Industry. The main drafters of this standard are Huang Jiaxu, Fan Guoqiang and Peng Liguo. From the date of implementation of this standard, the national standard GB1624-79 "Sodium hexametaphosphate" will be invalid. 5022 Preparation of blank test solution
Add 100mL of water and 10mL of (1+1) hydrochloric acid solution to a 250mL beaker and heat to a slight boil for 15min. Cool. Transfer all to a 250mL volumetric flask, dilute to scale with water, and shake well. 4.4.5.3 Determination
Use a pipette to transfer 10mL (5mL for qualified products) of test solution and an equal volume of blank test solution, and place them in two 100mL volumetric flasks respectively. According to the provisions of Article 5.4 of GB/T3049, start the operation from "add water to about 60mL if necessary". 4.4.6 Expression of analysis results
The iron (Fe) content (X) expressed as mass percentage is calculated according to formula (4): X.
×1000
25(mj mo)
（4）
Wherein: m1—the mass of iron found from the working curve according to the absorbance of the tested test solution, mg; m. -the mass of iron found from the working curve according to the absorbance of the tested blank test solution, mg; m mass of the sample, g;
V-—the volume of the test solution transferred, mL.
4.4.7 Allowable difference
The arithmetic mean of the parallel determination results is taken as the determination result. The absolute difference between the two parallel determination results shall not exceed 0.01%. 4.5 Determination of pH value
4.5.1 Instruments and equipment
4.5.1.1 Acidometer: graduation value 0.02 pH unit, equipped with saturated calomel electrode and glass electrode. 4.5.2 Analysis steps
Weigh 1.00±0.01g of sample, place it in a 250mL beaker, and dissolve it in 100mL of water without carbon dioxide. At room temperature, use an acidometer 501
HG/T2519-93
with a saturated calomel electrode as the reference electrode and a glass electrode as the measuring electrode to determine the pH value of the solution. 4.5.3 Allowable error
Take the arithmetic mean of the parallel determination results as the determination result. The absolute difference between the two parallel determination results shall not exceed 0.2 pH units. 4.6 Solubility test
4.6.1 Analysis steps
In a 250mL beaker, add 100mL of 10~~38℃ water, place it on an electromagnetic stirrer, and put in a stirrer with a length of 3.5~4.0cm. Add 5.0±0.1g of test material under stirring. The test material should be completely dissolved within 20min. 5 Inspection rules
5.1 Industrial sodium hexametaphosphate should be inspected by the quality supervision and inspection department of the manufacturer in accordance with the provisions of this standard. The manufacturer should ensure that all industrial sodium hexametaphosphate shipped out of the factory meets the requirements of this standard. Each batch of products shipped out of the factory should be accompanied by a quality certificate. The content includes: manufacturer name, product name, grade, net weight, batch number or production date, product quality certification that meets this standard and this standard number. 5.2 The user has the right to accept the industrial sodium hexametaphosphate received in accordance with the provisions of this standard. 5.3 Each batch of products shall not exceed 30t.
5.4 Determine the number of sampling units in accordance with the provisions of Article 6.6 of GB/T6678. When sampling, insert the sampler along the vertical center line to two-thirds of the depth of the material layer for sampling. The sample taken from each bag shall not be less than 100g. Mix the collected samples thoroughly, reduce them to about 500g by quartering, and immediately put them into two clean, dry wide-mouth bottles and seal them. Paste labels on the bottles, indicating: manufacturer name, product name, grade, batch number, sampling date and name of the sampler. One bottle is used for inspection and the other bottle is kept for three months for reference. 5.5 If one indicator of the inspection result does not meet the requirements of this standard, re-sampling should be carried out from twice the amount of packaging. If even one indicator of the inspection result does not meet the requirements of this standard, the entire batch of products cannot be accepted. 5.6 When the supply and demand parties have objections to the product quality, they shall be handled in accordance with the provisions of the "Interim Measures for National Product Quality Arbitration Inspection". 5.7 The rounded value comparison method specified in GB1250 shall be used to determine whether the inspection results meet the standards. 6 Marking, packaging, transportation and storage
6.1 The packaging of industrial sodium hexametaphosphate should be firmly and clearly marked, including: manufacturer name, product name, trademark, grade, net weight, batch number or production date, and this standard number. 6.2 Industrial sodium hexametaphosphate is packaged in composite plastic woven bags. The inner bag is a double-layer polyethylene film bag with a size of 880mm×500mm; the outer bag is a composite plastic woven bag with a size of 710mm×440mm. Its performance and inspection methods should comply with the relevant provisions of GB8947. The net weight of each bag is 25kg.
6.3 The inner bag of the package is tied with vinyl rope or other ropes of equivalent quality, or sealed with other equivalent methods. The outer bag is sewn with a bag sewing machine.
6.4 Industrial sodium hexametaphosphate should be covered during transportation to prevent sun and rain and avoid moisture. 6.5 Industrial sodium hexametaphosphate should be stored in a ventilated and dry warehouse. Additional Notes:
This standard was proposed by the Department of Science and Technology of the Ministry of Chemical Industry of the People's Republic of China. This standard is under the jurisdiction of Tianjin Chemical Research Institute of the Ministry of Chemical Industry. This standard was drafted by Chengdu Chemical Research and Design Institute and Tianjin Chemical Research Institute of the Ministry of Chemical Industry. The main drafters of this standard are Huang Jiaxu, Fan Guoqiang and Peng Liguo. From the date of implementation of this standard, the national standard GB1624-79 "Sodium hexametaphosphate" will be invalid. 5022 Preparation of blank test solution
Add 100mL of water and 10mL of (1+1) hydrochloric acid solution to a 250mL beaker and heat to a slight boil for 15min. Cool. Transfer all to a 250mL volumetric flask, dilute to scale with water, and shake well. 4.4.5.3 Determination
Use a pipette to transfer 10mL (5mL for qualified products) of test solution and an equal volume of blank test solution, and place them in two 100mL volumetric flasks respectively. According to the provisions of Article 5.4 of GB/T3049, start the operation from "add water to about 60mL if necessary". 4.4.6 Expression of analysis results
The iron (Fe) content (X) expressed as mass percentage is calculated according to formula (4): X.
×1000
25(mj mo)
（4）
Wherein: m1—the mass of iron found from the working curve according to the absorbance of the tested test solution, mg; m. -the mass of iron found from the working curve according to the absorbance of the tested blank test solution, mg; m mass of the sample, g;
V-—the volume of the test solution transferred, mL.
4.4.7 Allowable difference
The arithmetic mean of the parallel determination results is taken as the determination result. The absolute difference between the two parallel determination results shall not exceed 0.01%. 4.5 Determination of pH value
4.5.1 Instruments and equipment
4.5.1.1 Acidometer: graduation value 0.02 pH unit, equipped with saturated calomel electrode and glass electrode. 4.5.2 Analysis steps
Weigh 1.00±0.01g of sample, place it in a 250mL beaker, and dissolve it in 100mL of water without carbon dioxide. At room temperature, use an acidometer 501
HG/T2519-93
with a saturated calomel electrode as the reference electrode and a glass electrode as the measuring electrode to determine the pH value of the solution. 4.5.3 Allowable error
Take the arithmetic mean of the parallel determination results as the determination result. The absolute difference between the two parallel determination results shall not exceed 0.2 pH units. 4.6 Solubility test
4.6.1 Analysis steps
In a 250mL beaker, add 100mL of 10~~38℃ water, place it on an electromagnetic stirrer, and put in a stirrer with a length of 3.5~4.0cm. Add 5.0±0.1g of test material under stirring. The test material should be completely dissolved within 20min. 5 Inspection rules
5.1 Industrial sodium hexametaphosphate should be inspected by the quality supervision and inspection department of the manufacturer in accordance with the provisions of this standard. The manufacturer should ensure that all industrial sodium hexametaphosphate shipped out of the factory meets the requirements of this standard. Each batch of products shipped out of the factory should be accompanied by a quality certificate. The content includes: manufacturer name, product name, grade, net weight, batch number or production date, product quality certification that meets this standard and this standard number. 5.2 The user has the right to accept the industrial sodium hexametaphosphate received in accordance with the provisions of this standard. 5.3 Each batch of products shall not exceed 30t.
5.4 Determine the number of sampling units in accordance with the provisions of Article 6.6 of GB/T6678. When sampling, insert the sampler along the vertical center line to two-thirds of the depth of the material layer for sampling. The sample taken from each bag shall not be less than 100g. Mix the collected samples thoroughly, reduce them to about 500g by quartering, and immediately put them into two clean, dry wide-mouth bottles and seal them. Paste labels on the bottles, indicating: manufacturer name, product name, grade, batch number, sampling date and name of the sampler. One bottle is used for inspection and the other bottle is kept for three months for reference. 5.5 If one indicator of the inspection result does not meet the requirements of this standard, re-sampling should be carried out from twice the amount of packaging. If even one indicator of the inspection result does not meet the requirements of this standard, the entire batch of products cannot be accepted. 5.6 When the supply and demand parties have objections to the product quality, they shall be handled in accordance with the provisions of the "Interim Measures for National Product Quality Arbitration Inspection". 5.7 The rounded value comparison method specified in GB1250 shall be used to determine whether the inspection results meet the standards. 6 Marking, packaging, transportation and storage
6.1 The packaging of industrial sodium hexametaphosphate should be firmly and clearly marked, including: manufacturer name, product name, trademark, grade, net weight, batch number or production date, and this standard number. 6.2 Industrial sodium hexametaphosphate is packaged in composite plastic woven bags. The inner bag is a double-layer polyethylene film bag with a size of 880mm×500mm; the outer bag is a composite plastic woven bag with a size of 710mm×440mm. Its performance and inspection methods should comply with the relevant provisions of GB8947. The net weight of each bag is 25kg.
6.3 The inner bag of the package is tied with vinyl rope or other ropes of equivalent quality, or sealed with other equivalent methods. The outer bag is sewn with a bag sewing machine.
6.4 Industrial sodium hexametaphosphate should be covered during transportation to prevent sun and rain and avoid moisture. 6.5 Industrial sodium hexametaphosphate should be stored in a ventilated and dry warehouse. Additional Notes:
This standard was proposed by the Department of Science and Technology of the Ministry of Chemical Industry of the People's Republic of China. This standard is under the jurisdiction of Tianjin Chemical Research Institute of the Ministry of Chemical Industry. This standard was drafted by Chengdu Chemical Research and Design Institute and Tianjin Chemical Research Institute of the Ministry of Chemical Industry. The main drafters of this standard are Huang Jiaxu, Fan Guoqiang and Peng Liguo. From the date of implementation of this standard, the national standard GB1624-79 "Sodium hexametaphosphate" will be invalid. 5026 When the supply and demand parties have objections to the product quality, the provisions of the "Interim Measures for National Product Quality Arbitration Inspection" shall apply. 5.7 The rounded value comparison method specified in GB1250 shall be used to determine whether the inspection results meet the standards. 6 Marking, packaging, transportation, storage
6.1 The packaging of industrial sodium hexametaphosphate should have firm and clear markings, including: manufacturer name, product name, trademark, grade, net weight, batch number or production date, and this standard number. 6.2 Industrial sodium hexametaphosphate is packaged in composite plastic woven bags. The inner bag is a double-layer polyethylene film bag with a size of 880mm×500mm; the outer bag is a composite plastic woven bag with a size of 710mm×440mm. Its performance and inspection methods shall comply with the relevant provisions of GB8947. The net weight of each bag is 25kg.
6.3 The inner bag of the packaging is tied with a vinyl rope or other rope of equivalent quality, or sealed with other equivalent methods, and the outer bag is sewn with a bag sewing machine.
6.4 Industrial sodium hexametaphosphate should be covered during transportation to prevent it from being exposed to the sun and rain and to avoid moisture. 6.5 Industrial sodium hexametaphosphate should be stored in a ventilated and dry warehouse. Additional notes:
This standard is proposed by the Science and Technology Department of the Ministry of Chemical Industry of the People's Republic of China. This standard is under the jurisdiction of the Tianjin Chemical Research Institute of the Ministry of Chemical Industry. This standard was drafted by the Chengdu Chemical Research and Design Institute and the Tianjin Chemical Research Institute of the Ministry of Chemical Industry. The main drafters of this standard are Huang Jiaxu, Fan Guoqiang and Peng Liguo. From the date of implementation of this standard, the national standard GB1624-79 "Sodium Hexametaphosphate" will be invalid. 5026 When the supply and demand parties have objections to the product quality, the provisions of the "Interim Measures for National Product Quality Arbitration Inspection" shall apply. 5.7 The rounded value comparison method specified in GB1250 shall be used to determine whether the inspection results meet the standards. 6 Marking, packaging, transportation, storage
6.1 The packaging of industrial sodium hexametaphosphate should have firm and clear markings, including: manufacturer name, product name, trademark, grade, net weight, batch number or production date, and this standard number. 6.2 Industrial sodium hexametaphosphate is packaged in composite plastic woven bags. The inner bag is a double-layer polyethylene film bag with a size of 880mm×500mm; the outer bag is a composite plastic woven bag with a size of 710mm×440mm. Its performance and inspection methods shall comply with the relevant provisions of GB8947. The net weight of each bag is 25kg.
6.3 The inner bag of the packaging is tied with a vinyl rope or other rope of equivalent quality, or sealed with other equivalent methods, and the outer bag is sewn with a bag sewing machine.
6.4 Industrial sodium hexametaphosphate should be covered during transportation to prevent it from being exposed to the sun and rain and to avoid moisture. 6.5 Industrial sodium hexametaphosphate should be stored in a ventilated and dry warehouse. Additional notes:
This standard is proposed by the Science and Technology Department of the Ministry of Chemical Industry of the People's Republic of China. This standard is under the jurisdiction of the Tianjin Chemical Research Institute of the Ministry of Chemical Industry. This standard was drafted by the Chengdu Chemical Research and Design Institute and the Tianjin Chemical Research Institute of the Ministry of Chemical Industry. The main drafters of this standard are Huang Jiaxu, Fan Guoqiang and Peng Liguo. From the date of implementation of this standard, the national standard GB1624-79 "Sodium Hexametaphosphate" will be invalid. 502
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