Some standard content:
Chemical Industry Standard of the People's Republic of China
HG/T2571-94
Published on February 9, 1994
Ministry of Chemical Industry of the People's Republic of China
Implemented on July 1, 1994
W Chemical Industry Standard of the People's Republic of China
Subject Content and Scope of Application
HG/T2571-94
This standard specifies the technical requirements, test methods, inspection rules and marking, packaging, transportation and storage requirements of polishing paste. This standard applies to polishing paste made by mixing feldspar powder, lime, chromium oxide or other abrasives with grease in appropriate proportions. This product is mainly used for polishing and polishing of stainless steel, nickel-chromium plating, iron, copper, aluminum, gold, silver and other metals, as well as plastics and wood products. 2 Reference standards
GB1250 Method of expressing and determining limit values GB6003 Test sieve
GB/T6678 General rules for sampling of chemical products
3 Product classification
Polishing pastes are divided into six categories: I, I, I, N, V, V. 3.1 Class I uses feldspar powder as the main abrasive and is mainly used for rough polishing of metals and non-metals (original product name: yellow polishing paste). 3.2 Class I uses lime as the main abrasive and is mainly used for polishing of non-metals and non-ferrous metals (original product name: white polishing). 3.3 Class II uses chromium oxide as the main abrasive and is mainly used for fine polishing of stainless steel and electroplated devices (original product name: green polishing paste). 3.4 Class V uses red iron oxide as the main abrasive and is mainly used for polishing of gold, silver and polyester furniture (original product name: red polishing paste). 3.5V type uses corundum as the main abrasive and is mainly used for fine polishing of stainless steel and polishing of high carbon steel (original product name: black or steel, copper polishing paste).
3.6V type uses silicon carbide and corundum as the main abrasive and is mainly used for polishing of stainless steel (original product name: gray or purple polishing paste). Technical requirements
Polishing paste should meet the requirements in the following table.
Gloss enhancement value, gloss unit
Cutting ability, g
Hard point, ℃
Loss on ignition, %
Fineness (through 75um sieve), %bZxz.net
20.0~25.0
Approved by the Ministry of Chemical Industry of the People's Republic of China on February 9, 19941
23.0~28.0
30.0~35.0
17.0~20.0
Implemented on July 1, 1994
W.bzsoso.coD item
Gloss enhancement value, gloss unit
Cutting ability, g
Hard point, ℃
Loss on ignition, %
Fineness (through 75um sieve), %
5 Test method
5.1 Determination of gloss enhancement value
5.1.1 Instruments and equipment
HG/T2571-94
28.0~30.023.0~29.022.0~24.030.0~35.031.0~33.030.0~35.0
20.022.03
5.1.1.1 Polishing test machine: single machine speed 1300r/min, pressure 0~1.6MPa; 5.1.1.2 H62 brass sample: Φ64mm, 5.1.1.3 Mirror gloss meter: with 45° angle metal gloss measuring head. 5.1.2 Analysis steps:
Weigh the mass of a blank velvet polishing cloth (accurate to 0.001g), place the blank velvet polishing cloth on the polishing disc, start the polishing disc, and evenly spread the sample from the center of the polishing disc along the radius to the edge; stop the machine, remove the polishing cloth and weigh its mass (accurate to 0.001g). The mass of the sample on the polishing cloth should meet the requirements in the following table, otherwise, repeat the operation. Class
I, I, V
Amount of sample applied, g
0.40~0.50
0.20~0.25
0.08~0.12
After lightly and evenly polishing the copper block with O# sandpaper, wipe it clean with lens paper, and measure the glossiness of three fixed points with a mirror gloss meter. The arithmetic mean should be less than 1.5 gloss units, and then weigh the mass of the copper block (accurate to 0.001g); install it on the polishing test machine, add 0.4MPa pressure, start the polishing machine and polish for 20s. After stopping, remove the copper block and cool it; gently wipe off the grease with lens paper, measure the glossiness of three fixed points and weigh it (accurate to 0.001g). The velvet polishing cloth should be washed and dried after each polishing. 5.1.3 Expression of analysis results
The gloss improvement value X is calculated according to formula (1): X=GIG.
Wherein: G1—arithmetic mean of the gloss at three fixed points of the standard sample after polishing, gloss unit;—arithmetic mean of the gloss at three fixed points of the standard sample before polishing, gloss unit. Go
5.1.4 Allowable difference
HG/T2571—94
The arithmetic mean of the parallel measurement results is taken as the measurement result, and the absolute difference of the parallel measurement results shall not exceed 2.0 gloss units. 5.2 Determination of cutting ability
5.2.1 Instruments and equipment
Same as 5.1.1.
5.2.2 Analysis steps
Same as 5.1.2.
5.2.3 Expression of analysis results
The cutting capacity X is calculated according to formula (2):
X2=mo-ml
Wherein: m—mass of the standard sample after polishing, g; mo——mass of the standard sample before polishing, g. 5.2.4 Allowable difference
The arithmetic mean of the parallel determination results is taken as the determination result, and the absolute difference of the parallel determination results shall not exceed 0.002g. 5.3 Determination of hard spot
5.3.1 Instruments and equipment
5.3.1.1 Evaporating blood with handle: 30 or 50mL; 5.3.1.2 Thermometer: the graduation value is 1℃. 5.3.2 Analysis steps
Weigh about 30-40g of sample, place it in evaporating blood with handle, heat it to about 80℃, and melt it. Remove from the electric furnace and cool; stir with a glass rod to gradually solidify it. The temperature at which it no longer adheres to the inner wall of the evaporating dish is the hardening point. 5.3.3 Allowable difference
Take the arithmetic mean of the parallel determination results as the determination result. The absolute difference of the parallel determination results shall not exceed 1°C. 5.4 Determination of loss on ignition
5.4.1 Instruments and equipment
Porcelain crucible: 30mL.
5.4.2 Analysis steps
Weigh 1~2g of sample (accurate to 0.0002g) and place it in porcelain that has been burned to constant weight at 550±10℃. Burn at 550±10℃ for 1h. Cool to room temperature in a desiccator and weigh (accurate to 0.0002g). 5.4.3 Expression of analysis results
Ignition loss X expressed as mass percentage: calculated according to formula (3): m-mlx100
Where: m1——mass of ignition residue, g; m1——mass of sample, g.
5.4.4 Allowable difference
The arithmetic mean of the parallel determination results shall be taken as the determination result, and the absolute difference of the parallel determination results shall not exceed 0.2%. 5.5 Determination of fineness
5.5.1 Reagents and materials
5.5.1.1 Kerosene (GB253);
5.5.1.2 95% ethanol (GB/T679).
5.5.2 Instruments and equipment
W.bzsoso.coDHG/T2571—94
5.5.2.1 Test sieve (GB6003): R40/3 series, Φ50mm×30mm/0.075mm5.5.2.2 Small regular script brush.
5.5.3 Analysis steps
Weigh about 5g of chopped sample (accurate to 0.01g) and place it in a 250mL beaker; add 100mL kerosene, stir with a flat-headed glass rod, and break all lumps, but do not grind. If necessary, it can be slightly heated in a water bath. Slowly pour the mixture of grease and abrasive that is completely dispersed into the test sieve that has been dried to constant weight at 105-110℃, and rinse the beaker and glass rod with kerosene in a wash bottle. Use a brush to gently brush the sieve residue and brush the particles on the sieve wall into the sieve. Then, rinse the brush clean, rinse the sieve residue and the inner wall of the test sieve with a small amount of ethanol, place it in the air until the solvent evaporates, and then dry the test sieve and the sieve residue at 105-110℃ to constant weight. 5.5.4 Expression of analysis results
The fineness X expressed as mass percentage is calculated according to formula (4): X,=\=\×100
Where: m1—mass of sieve residue, g;
m——mass of test sample, g.
5.5.5 Allowable difference
Take the arithmetic mean of the parallel determination results as the determination result, and the absolute difference of the parallel determination results shall not exceed 1.0%. 6 Inspection rules
(4)
6.1 The five indicators of gloss increase value, cutting ability, hard fixation point, loss on ignition and fineness specified in this standard are type inspection items, and the four indicators of gloss increase value, cutting ability, hard fixation point and loss on ignition are factory inspection items, which must be inspected batch by batch. Under normal production conditions, type inspection shall be carried out at least once every three months. 6.2 Polishing paste shall be inspected by the quality supervision and inspection department of the manufacturer in accordance with the provisions of this standard. The manufacturer shall ensure that all products leaving the factory meet the requirements of this standard. Each batch of products leaving the factory shall be accompanied by a quality certificate. The content includes the manufacturer's name, address, product name, category, model, net weight, batch number or production date, proof that the product quality complies with this standard and the standard number. 6.3 The user has the right to accept the polishing paste received in accordance with the provisions of this standard. 6.4 Each batch of products shall not exceed 40t.
6.5 According to the provisions of Article 6.6 of GB/T6678, determine the number of sampling units, and randomly select one (can) from each box (bag); when sampling, open the polishing paste from 1/4 and cut a whole piece at the cross section. The sample shall not be less than 200g. Place the sample in an evaporating dish with a handle, heat and melt, stir evenly, and divide it into two parts. One part is used for inspection, and the other is sealed and stored and labeled with the manufacturer name, product name, category, model, batch number, sampling date and name of the sampler. 6.6 If one of the indicators of the inspection results does not meet the requirements of this standard, re-sample from twice the amount of packaging for verification. If even one of the indicators of the verification results does not meet the requirements of this standard, the entire batch of products cannot be accepted. 6.7 When the supply and demand parties have objections to the product quality, they shall be handled in accordance with the provisions of the "Product Quality Law of the People's Republic of China". 6.8 The rounded value comparison method specified in GB1250 shall be used to determine whether the inspection results meet the standards. 7 Marking, packaging, transportation and storage
7.1 Polishing paste packaging containers should be firmly and clearly marked, including the manufacturer's name, address, product name, trademark, category, model, net weight, batch number or production date and the number of this standard. The category and model divided by color can be indicated in brackets after the product name. 7.2 Polishing paste adopts four packaging methods.
7.2.1 Polishing paste is packaged in tinplate cans or polyvinyl chloride plastic cans, with a net weight of 1kg per can and 20 cans in cartons. 7.2.2 Polishing paste is packaged in film plastic bags as inner packaging, plastic barrels as containers, and plastic woven bags as outer packaging for every two barrels. Each bag has a net weight of 40 kg.
7.2.3 Polishing paste is packaged in cartons, with a net weight of 16, 18 or 20kg per box. 7.2.4 Class 1 polishing paste can be packaged in simple packaging or bulk. 7.3 Polishing paste should be covered during transportation to prevent rain and moisture. 7.4 Polishing paste should be stored in a cool, ventilated and dry place. Additional remarks:
This standard was proposed by the Technical Supervision 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 Shanghai Xinhua Chemical Plant, Tianjin Chemical Research Institute of the Ministry of Chemical Industry, Guangzhou Xintang Chemical Plant, Chongqing Polishing Paste Plant, and Beijing Huairou Polishing Paste Plant.
The main drafters of this standard are Yang Chengyin, Wang Qi, Qiu Chengyan, Xia Huilan, Chen Shihua, and Peng Xingru. 5
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