Some standard content:
ICS 71. 060. 40
Registration No.: 7510—2000
HG/T 3688-—2000
This standard is formulated based on the US military standard MIL-P-11751E:1994 "Potassium Hydroxide Solution" in a non-equivalent manner. The main difference between this standard and MII-P-11751E--1994 is that: "The first standard is divided into two grades according to the quality of solid products: superior products and first-class products; the US military standard is divided into three categories according to the concentration of the solution. 1: This standard sets 13 indicators, and the third category of the US military standard sets 10 indicators. This standard adds three items: calcium, nickel and aluminum. The test method is in accordance with the method specified in the national standard GB/T1919-1994 "Industrial Potassium Hydroxide", in which the determination of potassium hydroxide content adopts the tetraphenylborate sodium weight method and acid-base titration method in parallel. The test method of the newly added items is in accordance with the nickel in GB/T2306-1997 "Chemical Reagent Potassium Hydroxide" Determination of-
-Atomic absorption spectrophotometry.
This standard is proposed by the Policy and Regulations Department of the State Administration of Petroleum and Chemical Industry. This standard is under the jurisdiction of the Inorganic Chemical Subcommittee of the National Technical Committee for Chemical Standardization. The drafting units of this standard are: Tianjin Chemical Research and Design Institute, Chengdu Chemical Co., Ltd. The main drafters of this standard are: Liu Shuying, Yang Qianshuang, and Wang Youkun. This standard is entrusted to the Inorganic Chemical Subcommittee of the National Technical Committee for Chemical Standardization for interpretation. This standard is published for the first time.
Chemical Industry Standard of the People's Republic of China
Flaky and high-quality potassium hydroxide for industrial use1Scope
HG/T 3688—2000
This standard specifies the requirements, test methods, inspection rules, as well as marking, labeling, packaging, transportation, storage and safety of high-quality flake potassium hydroxide.
This standard applies to high-quality flake potassium hydroxide obtained by electrolysis of refined potassium chloride by ion membrane method. This product is mainly used in the battery industry, advanced detergents and cosmetics, disproportionate rosin potassium soap and various potassium salts, pharmaceutical intermediates, synthetic rubber, ABS resin and natural rubber emulsion, fermentation, paper weighting agent, etc.
Molecular formula: KO H
Relative molecular mass: 56.11 (according to the 1997 International Relative Atomic Mass) 2 Reference standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and the parties using this standard should explore the possibility of using the latest versions of the following standards. GB190—1990 Dangerous Goods Packaging Marking
GB191-1990 Pictorial Marking of Packaging Storage and Transportation
GB/T 601—1988
GB/T 602—1988
GB/T 603—1988
Chemical reagents-Preparation of standard solutions for titration analysis (volumetric analysis) Preparation of standard solutions for determination of impurities in chemical reagents Preparation of preparations and products used in test methods for chemical reagents Methods for expressing and determining limit values GB/T 1250--1989
GB/T2306-—1997
GB/T 3049--1986
Chemical reagents-Potassium hydroxide
General method for determination of iron content in chemical products-Phenanthroline spectrophotometric method (negISO6685:1982)
GB/T3051-—2000 General method for determination of fluoride in inorganic chemical products-Mercury titration method (neqISO5790:1979) GB/T 6682-1992
GB/T 9723—1988
3 Requirements
Specifications and test methods for water used in analytical laboratories (negISO3696:1987) Chemical reagents Flame atomic absorption spectrometry General principles 3.1 Appearance: High-quality flake potassium hydroxide should be white flakes. 3.2 High-quality flake potassium hydroxide should meet the requirements of Table 1. Approved by the State Administration of Petroleum and Chemical Industry on August 21, 2000 394
Implemented on May 1, 2001
Potassium hydroxide (KOH) content
Potassium carbonate (K,CO) content
Chloride (as CI) content
Iron (Fe) content
Sulfate (as SO) content
Nitrate and nitrite (as N) contentSodium (Na) content
Phosphate (as P(),) content
Silicate (as SiO) content
Aluminum (AI) content
Calcium (Ca) content
Nickel (Ni) content
Heavy metal (as Pb) content
HG/T 3688-2000
Table 1 Requirements
Superior Products
Note: If the user has no requirements for the sodium (Na) index, it can be left uncontrolled. 4
Test Method
The reagents and water used in this standard, unless otherwise specified, refer to analytical pure reagents and grade 3 water specified in GB/T6682. The standard titration solutions, impurity standard solutions, preparations and products used in the test, unless otherwise specified, are prepared in accordance with the provisions of GB/T601, GB/T602 and GB/T603
Safety Tips: The samples and some reagents used in the test are corrosive or toxic. Be careful when handling to prevent contact with the skin. If contact with the skin, rinse immediately with plenty of water.
4.1 Determination of potassium hydroxide content
4.1.1 Sodium tetraphenylborate gravimetric method (arbitration method)4.1.1.1 Summary of the method
Under weakly acidic conditions, potassium ions react with sodium tetraphenylborate to form potassium tetraphenylborate precipitate. Filter, dry and weigh. 4.1.1.2 Reagents and materials
a) Anhydrous ethanol.
b) Glacial acetic acid solution: 100g/L.
r) Sodium tetraphenylborate ethanol solution: 0.1mol/L. Weigh 3.4g of sodium tetraphenylborate, dissolve it in 100mL of anhydrous ethanol and let it stand for 24h. Filter it with a glass sand crucible before use. d) Ethanol-potassium tetraphenylborate saturated solution.
Weigh 1g of the potassium tetraphenylborate precipitate obtained in the test (4.1.1.4b)), add 50mL of anhydrous ethanol and 950ml of water, shake it to saturate it, and filter it before use.
e) Methyl red indicator solution: 1g/L.
4.1.1.3 Apparatus and equipment
Glass sand crucible: pore size 5μm~15μm.
4.1.1.4 Analysis steps
a) Preparation of test solution
HG/T 3688—2000
Use a weighing bottle to quickly weigh about 40g of the sample (accurate to 0.0002g). Place it in a 250ml beaker and add an appropriate amount of water without carbon dioxide to dissolve it. After cooling, transfer all of it to a 1000mL volumetric flask, dilute it to the mark with water without carbon dioxide, and shake it well. This solution is test solution A, which is used for the determination of potassium hydroxide, potassium carbonate, chloride, iron, and sodium content. b) Determination
Use a pipette to transfer 20ml of test solution A to a 500mL volumetric flask, dilute it to the mark with water without carbon dioxide, and shake it well. Dry filter if necessary. Take 20mL of this solution with a pipette, place it in a 100mL beaker, add 1 drop of methyl red indicator solution, and adjust to a slightly reddish color with acetic acid. Heat to 40℃ and remove. Add 8ml~9ml of sodium tetraphenylborate ethanol solution dropwise with stirring. Add it in about 5 minutes. Let it stand for 10 minutes. Filter with a glass sand that has been weighed to a constant weight, wash the precipitate with 40ml.~50mL of ethanol-potassium tetraphenylborate saturated solution, use 5ml each time, and drain it each time. Stop filtration, wash with 2mL of anhydrous ethanol, and drain it again. Dry at (120±5)℃ to a constant weight. 4.1.1.5 Expression of analytical results
The potassium hydroxide (KOH) content (X10) expressed as mass percentage is calculated according to formula (1): X1 × 0.156 6X100(X10 × 0.811 9 + X10 × 1.582 5)20
m×1000×500
1.958×10*ml
21 - (0.811 9X; +1.582 5X3)m
Where: m ---Mass of potassium tetraphenylborate precipitate, g; ---Mass of sample, g;
0.1566---Coefficient of potassium tetraphenylborate converted to potassium hydroxide; X2---Potassium carbonate content measured in 4.1.2, %; 0.8119.---Coefficient of potassium carbonate converted to potassium hydroxide; X:---Chloride content measured in 4.2 (in terms of Cl), %; 1.5825---Coefficient of chlorine converted to potassium hydroxide. 4.1.1.6 Allowable difference
The arithmetic mean of the parallel determination results is taken as the determination result. The absolute difference of the parallel determination results shall not exceed 0.3%. 4.1.2 Determination of potassium hydroxide and potassium carbonate content (acid-base titration method) 4.1.2.1 Summary of method
Take one portion of the test solution and titrate it with standard hydrochloric acid solution using methyl orange as the indicator. Take another portion of the test solution and add barium chloride to the potassium carbonate in the test solution to form barium carbonate precipitation. Use phenolphthalein as the indicator and titrate with standard hydrochloric acid solution. The potassium carbonate content is obtained by the difference between the two titration results.
4.1.2.2 Reagents and materialsbzxZ.net
a) Barium chloride solution: 100g/L (adjust with sodium hydroxide solution until the phenolphthalein indicator turns pink). b) Standard hydrochloric acid solution: c(HC1) about 1 mol/I. c) Methyl orange indicator solution: 1 g/L.
d) Phenolyl indicator solution: 10g/L.
4.1.2.3 Analysis steps
Use a pipette to transfer two 50mL portions of test solution A and place them in 250mL conical flasks respectively. Take one portion and add 10ml of chlorinated sodium solution, shake for 2min~3min, add 2-3 drops of phenolphthalein indicator solution, and titrate with hydrochloric acid standard titration solution until the solution is colorless, and determine the potassium hydroxide content; add 12 drops of methyl orange indicator solution to the other portion and titrate with hydrochloric acid standard titration solution until it turns orange-red. The difference between the two titration results is the potassium carbonate content.
4.1.2.4 Expression of analysis results
The content of potassium hydroxide (KOH) expressed as mass percentage (X,) is calculated according to formula (2): 396
HG/T 3688--2000
X, Vic× 0.056 11
X 100- (Xs× 2.440 6)
112.2Vic(X: X 2.440 6)
The content of potassium carbonate (KCO) expressed as mass percentage (X,) is calculated according to formula (3): Xx -V.-V)X0.069 10 ×100
138.2c(Vz - Vi)
Wherein:
0.056 11-
0. 069 10---
The volume of standard hydrochloric acid solution consumed in titration with phenolphthalein as indicator, mL; The volume of standard hydrochloric acid solution consumed in titration with methyl orange as indicator, mL Actual concentration of standard hydrochloric acid solution, mol/L; The mass of the sample, g;
-4.6 The measured sodium (Na) content, %;
·(3)
The mass of potassium hydroxide expressed in grams equivalent to 1.00mL standard hydrochloric acid solution [c(HCl)=1.000mol/L];
The coefficient for converting sodium (Na) to potassium hydroxide; -The mass of potassium carbonate expressed in grams equivalent to 1.00mL standard hydrochloric acid solution [c(HCl)=1.000mol/L].
4.1.2.5 Allowable difference
The arithmetic mean of the parallel determination results is taken as the determination result. The absolute difference of the parallel determination results shall not exceed 0.1%. 4.2 Determination of chloride content
4.2.1 Method summary
Same as Chapter 3 of GB/T3051-2000.
4.2.2 Reagents and materials
Same as Chapter 4 of GB/T3051-2000 and:
Standard endpoint comparison solution.
Add 100ml of water and 3 drops of bromophenol blue indicator solution to a 250ml conical flask, add (1+15) nitric acid solution until it turns yellow, and add 2 drops in excess. Add 1ml of diphenylazocarbonylhydrazide indicator solution and titrate with 0.05mol/L mercuric nitrate standard titration solution in a microburette until it turns purple-red. This solution is prepared before use.
4.2.3 Instruments and equipment
Same as Chapter 5 of GB/T3051-2000.
4.2.4 Analysis steps
Use a pipette to transfer 20mL of test solution A into a 250ml conical flask, and add water to about 100mL. Add 3 drops of bromophenol blue indicator solution, add (1+1) nitric acid solution until it turns yellow, and then adjust it to just blue with sodium hydroxide solution. Then add (1+15) nitric acid solution until it turns yellow, with an excess of 2 drops. Add 1 mL of diphenylazocarbonylhydrazide indicator solution, and use a microburette to titrate with 0.05mol/L mercuric nitrate standard titration solution until it turns the same purple-red color as the standard endpoint comparison solution. Collect the mercury-containing waste liquid after titration and treat it according to the provisions of Appendix D of GB/T3051-2000. 4.2.5 Expression of analytical results
The chloride content (in terms of Cl) expressed as mass percentage (X,) is calculated according to formula (4): Vo)c×0. 035 45×100
m×1000
Wherein:
HG/T3688--2000
177. 25c(V-Vo)
the volume of the standard mercuric nitrate solution consumed by the titration test solution, mL; the volume of the standard mercuric nitrate solution consumed by the standard endpoint comparison solution, mL; the actual concentration of the standard mercuric nitrate solution, mol/L; the mass of the sample, g;
(4)
the mass of chlorine in grams equivalent to 1.00 ml of the standard mercuric nitrate solution [c(1/2Hg(NO3)),）=1.000 mol/L].
4.2.6 Allowable difference
The arithmetic mean of the parallel determination results shall be taken as the determination result. The absolute difference of the parallel determination results shall not exceed 0.03%. 4.3 Determination of iron content
4.3.1 Summary of method
Same as Chapter 2 of GB/T3049-1986.
4.3.2 Reagents and materials
Same as Chapter 3 of GB/T3049-1986.
4.3.3 Instruments and equipment
Spectrophotometer: with an absorption cell with a thickness of 3 cm. 4.3.4 Analysis steps
4.3.4.1 Drawing of working curve
Use a 3cm absorption cell, take the corresponding volume of iron standard solution, and draw the working curve according to GB/T3049. 4.3.4.2 Determination
Use a pipette to transfer 50mL of test solution A and 50ml of water, and place them in 100mL beakers respectively. The following operations are carried out according to the provisions of 5.4.1 of GB/T30491986, starting from "If necessary, add water to 60mL..." 4.3.5 Expression of analysis results
The iron (Fe) content (X4) expressed as mass percentage is calculated according to formula (5): X (ml mo)×10*3
m×1000
2 X(mi - mo)
Wherein: mr-
(5)
-The mass of iron found from the working curve based on the measured absorbance of the test solution, mg; -The mass of iron found from the working curve based on the measured absorbance of the blank solution, mg; --The mass of the sample, g.
4.3.6 Allowable difference
The arithmetic mean of the parallel determination results is taken as the determination result. The absolute difference of the parallel determination results shall not exceed 0.003%. 4.4 Determination of sulfate content
4.4.1 Method summary
In hydrochloric acid medium, sulfate and barium ions generate white fine barium sulfate precipitate, which is suspended in the solution and compared with the standard turbidity solution. 4.4.2 Reagents and materials
4.4.2.1 Hydrochloric acid solution: 1+3.
4.4.2.2 Sulfate standard solution: 1mL solution contains 0.01mgSOk. Preparation: Pipette 10mL of sulfate standard solution prepared according to GB/T602, place in a 100mL volumetric flask, dilute to the scale, and shake well. This solution is prepared before use.
4.4.2.3 Mixed solution
HG/T 3688—2000
Weigh 70g sodium chloride and place it in a 1000mL beaker, add 500mL water to dissolve, add 10ml hydrochloric acid, 500ml propylene glycol, add 50g barium chloride, and mix well.
4.4.3 Analysis steps
Use a weighing bottle to quickly weigh (2.00±0.01)g of the sample, place it in a 100ml volumetric flask, add 50mL of water without carbon dioxide to dissolve, cool it down and dilute it to the scale with water without carbon dioxide, and shake it well. Use a pipette to transfer 10ml of test solution A, place it in a 50ml colorimetric tube, and neutralize it with hydrochloric acid solution to pH3~4 (check with pH test paper). Add 10mL of the mixed solution, add water to the scale, shake for 1min, and let it stand for 5min. Its turbidity shall not be greater than that of the standard turbidity solution of sulfate.
Preparation of standard turbidity solution of sulfate: Use a pipette to transfer 1 mL of standard sulfate solution and place it in another 50 mL.In the colorimetric tube, add 10mL of the mixed solution, add water to the scale, shake for 1min, and let it stand for 5min. 4.5 Determination of nitrate and nitrite content 4.5.1 Method summary
Under alkaline conditions, the nitrate and nitrite in the test solution react with the nitrogen alloy, and the generated ammonia is absorbed by sulfuric acid solution after distillation. Add Nessler's reagent to generate a red complex, which is compared with the standard colorimetric solution. 4.5.2 Reagents and materials
4.5.2.1 Ammonia-free water.
4.5.2.2 Nitrogen alloy.
4.5.2.3 Sulfuric acid solution: 1+333.
4.5.2.4 Sodium hydroxide solution: 250g/1, ammonia-free. 4.5.2.5 Nitrogen standard solution: 1mL contains 0.01mgN. Preparation: Take 10mL of nitrogen standard solution prepared according to GB/T602, place it in a 100mL volumetric flask, dilute it to the mark with water, and shake it well. This solution should be prepared just before use.
4.5.2.6 Nessler's reagent.
4.5.3 Apparatus and equipment
Nitrogen determination distillation device: as shown in Figure 1. Other distillation devices with the same effect can also be used. 1-· Distillation flask; 2-Gas-liquid separation ball; 3-Conduit; 4-Ammonia absorption tube with buffer ball (there are 6 1mm diameter holes at the end of the tube inserted into the bottom of the colorimetric tube, evenly distributed); 5-Colorimetric tube Figure 1 Diagram of nitrogen determination distillation device
4.5.4 Analysis steps
4.5.4.1 Analysis preparation
HG/T 3688-2000
Pour an appropriate amount of water into the distillation flask and heat it to boiling. Clean the device with the steam generated by boiling until the distillate no longer precipitates nitrogen (use Nessler's reagent to test: take the same volume of absorption liquid and water, add the same amount of Nessler's reagent respectively, and compare the colors of the two). 4.5.4.2 Determination
Quickly weigh (2.00±0.01)g of sample with a weighing bottle, place it in a distillation bottle, add 50mL of water without carbon dioxide to dissolve, add 25mL of ammonia-free water, and shake to hook. Use a pipette to transfer 1mL of nitrogen standard solution, place it in another distillation bottle, add 65mL of ammonia-free water and 5mL of sodium hydroxide solution, and shake well. Add 1g of nitrogen determination alloy to each, and quickly connect the distillation device. Add 2mL of sulfuric acid solution to each of the two colorimetric tubes, and add a small amount of water so that the air hole at the end of the catheter is submerged in the solution. Mix the solution in the distillation bottle and leave it for 1h, shaking it regularly during this period. Gradually heat the distillation bottle to make the solution boil until about 40mL of solution is distilled out. Remove the catheter and stop heating. Rinse the catheter with a small amount of water and collect the washing liquid in a colorimetric tube.
Add 1mL of sodium hydroxide solution and 2mL of Nessler's reagent to two colorimetric tubes respectively, add water to the scale, mix well, and stand for 10 minutes. The color of the test solution should not be darker than that of the standard colorimetric solution. 4.6 Determination of sodium content
4.6.1 Summary of method
Under acidic conditions, use a flame emission spectrophotometer to measure the radiation intensity at 589nm, and use the working curve method to determine the sodium content in the sample.
4.6.2 Reagents and materials
4.6.2.1 Hydrochloric acid solution: 1+5.
4.6.2.2 Potassium chloride solution: 5g/L.
4.6.2.3 Sodium standard solution: 1mL solution contains 0.1mgNa. 4.6.2.4 Sodium solution: 1mL solution contains 0.01mgNa. Preparation: Accurately pipette 10mL of 4.6.2.3 sodium standard solution and dilute it 10 times. Used to adjust the flame emission spectrophotometer. 4.6.2.5 Methyl orange indicator solution: 1g/L,
4.6.3 Instruments and equipment
Flame emission spectrophotometer with sodium filter. 4.6.4 Analysis steps
4.6.4.1 Working curve drawing
In 6 100mL volumetric flasks, add 0.00 (reagent blank solution), 2.00, 4.00, 6.00, 8.00, 10.00ml sodium standard solution, add 10mL potassium chloride solution and 5mL hydrochloric acid solution to each, dilute with water to the scale, and shake. In the flame emission spectrophotometer, at a wavelength of 589nm, adjust the zero with water and adjust the scale to 100 with sodium solution. Measure the radiation intensity of the above solutions in sequence. Subtract the radiation intensity of the reagent blank solution from the measured radiation intensity, and draw a working curve with the amount of sodium (mg) as the horizontal axis and the corresponding radiation intensity as the vertical axis.
4.6.4.2 Determination
Use a pipette to transfer 10ml of test solution A, place it in a 100mL volumetric flask, add water to dissolve, dilute with water to the scale, and shake it. Use a pipette to transfer 10ml of this solution and 10mL of water (reagent blank solution), place them in 100mL volumetric flasks, add 20mL of water and 2 drops of methyl orange indicator solution to each. Add hydrochloric acid solution until the indicator changes color, add 5mL in excess, dilute with water to the scale, and shake it. In the flame emission spectrophotometer, at a wavelength of 589nm, adjust the zero with water and adjust the scale to 100 with sodium solution. Measure the radiation intensity of the reagent blank solution and the test solution in turn. Find the corresponding amount of sodium from the working curve. 4.6.5 Expression of analysis results
The sodium (Na) content (X) expressed as mass percentage is calculated according to formula (6): X, m =) × 1% × 100
m × 1000 × 100
HG/T 3688-2000
100 (ml -m)
Where: mi - the amount of sodium in the test solution found from the working curve, mg; - the amount of sodium in the reagent blank solution found from the working curve, mg; mo
m---~-the mass of the sample, g.
4.6.6 Allowable difference
The average value of the two determination results is taken as the determination result. The difference between the parallel determination results shall not exceed 0.1%. 4.7 Determination of phosphate content
Determine according to the provisions of 5.7 of GB/T2306-1997. (6)
Preparation of standard colorimetric solution: Use a pipette to dilute the phosphate standard solution containing 0.010 mg PO. to 5 ml and treat it in the same way as the test solution.
4.8 Determination of silicate content
Determine in accordance with 5.8 of GB/T2306-1997. Preparation of standard colorimetric solution: Use a pipette to dilute the silicon standard solution containing 0.010 mg SiO: to 5 ml and treat it in the same way as the test solution.
4.9 Determination of aluminum content
Determine in accordance with 5.11 of GB/T2306--1997. Preparation of standard colorimetric solution: Use a pipette to dilute the aluminum standard solution containing 0.010 mg Al to 10 ml and treat it in the same way as the test solution.
4.10 Determination of calcium content
Determine in accordance with 5.12 of GB/T23061997. Preparation of standard colorimetric solution: Use a pipette to take a calcium standard solution containing 0.005 mg Ca, dilute to 10 mL and treat it in the same way as the test solution.
4.11 Determination of nickel content
4.11.1 Method summary
On an atomic absorption spectrophotometer, test the absorbance of the test solution at 232.0 nm, and use the standard addition method to determine the nickel content in the sample.
Reagents and materials
4.11.2.1 Hydrochloric acid solution: 1+1.
4. 11. 2. 2
Phenolic acid indicator solution: 10 g/L.
: Nickel standard solution: 1 mL of solution contains 0.01 mg Ni. 4.11.2.3
4.11.3 Instrument conditions
Light source: nickel hollow cathode lamp;
4.11.3.2 Atomic absorption spectrophotometer: at wavelength 232.0nm; 4.11.3.3 Flame: acetylene-air.
4.11.4 Analysis steps
Weigh 5g sample (accurate to 0.01g), add 20mL water to dissolve, add 1 drop of phenolphthalein indicator solution, neutralize with hydrochloric acid solution until colorless, and add 12 drops in excess, dilute with water to 100ml. Use a pipette to transfer 20mL of the test solution, a total of four portions. Determine according to 6.2.2 of GB/T9723-1988.
4.12 Determination of heavy metal (in terms of Pb) content Determination according to 5.16 of GB/T2306-1997. Preparation of standard colorimetric solution: Use a pipette to transfer the lead standard solution containing 0.02mgPb and dilute it to 20ml. Treat it in the same way as the test solution of the same volume.
5 Inspection plan
HG/T 3688-2000
5.1 All items specified in this standard are factory inspection items. 5.2 Each batch of products shall not exceed 50t.
5.3 This product is continuously made into flakes and packed in bags. The sampling regulations are as follows: take a little flake caustic soda every 10 bags and put it in two 1000mL clean and dry wide-mouth bottles (the bottle stoppers are rubber stoppers), and immediately cover them tightly to prevent moisture absorption. The sample taken should be no less than 500g. Plug in the bottle stoppers, shake the sample, and pack it in two clean and dry glass 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 as a laboratory sample, and the other bottle is kept for three months for reference. 5.4 High-quality flaky potassium hydroxide should be inspected by the quality supervision and inspection department of the manufacturer in accordance with the requirements of this standard. The manufacturer should ensure that each batch of products shipped from the factory meets the requirements of this standard. 5.5 The user has the right to inspect and accept the high-quality flaky potassium hydroxide received in accordance with the provisions of this standard. The inspection and acceptance should be carried out within 15 days from the date of arrival of the goods.
5.6 If any index of the test result does not meet the requirements of this standard, re-sample from twice the number of sampling units should be re-tested. If even one index of the re-test result does not meet the requirements of this standard, the entire batch of products shall be considered unqualified. 5.7 The rounded value comparison method specified in GB1250 shall be used to determine whether the test result meets the standard. 6 Marking and labeling
6.1 Bags of high-quality potassium hydroxide flakes should be firmly and clearly marked, including: manufacturer name, factory address, product name, trademark, grade, net content, batch number or production date and the number of this standard, as well as the "corrosive product mark" specified in GB190 and the "wet-afraid" mark specified in GB191.
6.2 Each batch of high-quality potassium hydroxide flakes shipped from the factory should be accompanied by a quality certificate. The content includes: manufacturer name, factory address, product name, trademark, grade, net content, batch number or production date, proof that the product quality complies with this standard and the number of this standard. 7 Packaging, transportation and storage
7.1 High-quality potassium hydroxide flakes are double-layer packaged, with polyethylene plastic film bags as the inner packaging and polypropylene coated woven bags as the outer packaging. The net content of each bag is 25kg.
When packaging, the inner layer is tied with vinyl rope or other ropes of equivalent quality. The outer woven bag is sewn with a bag sewing machine. High-quality flaky potassium hydroxide can also be packaged in tons. The dimensions of the container are: 13m×2.3m×2.25m; the dimensions of the outer bag are: 900cm×900cm×1100cm. The inner bag is made of polyethylene with a thickness of 0.1mm, a total of two layers, and the outer bag is a polypropylene coated woven bag. The net content of each bag is 1000kg.
7.2 High-quality flaky potassium hydroxide should be covered during transportation to prevent sun exposure, rain, and packaging damage. 7.3 High-quality flaky potassium hydroxide should be stored in a ventilated and dry warehouse to prevent sun exposure, moisture, impact, and away from flammable materials. 8 Safety
Potassium hydroxide is a corrosive product and can cause chemical burns if it comes into contact with the skin. The workshop should be equipped with ventilation and exhaust equipment. Operators should wear protective glasses, rubber gloves and other labor protection equipment. Once in contact with the skin, rinse immediately with plenty of water. 402
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