Some standard content:
This standard was proposed by the Department of Market and Economic Information of the Ministry of Agriculture. This standard is under the jurisdiction of the Township Enterprise Bureau of the Ministry of Agriculture. This standard was drafted by the Quality Supervision, Inspection and Testing Center of Fireworks and Firecrackers of the Ministry of Agriculture. The main drafters of this standard are: Peng Yanping, Liu Hongyan, Liu Chunwen, Zhang Wenjun, Xia Qiming. NY/T757—2003
"Model Letter
Fireworks Propellant
NY/T757--2003
This standard specifies the technical requirements, test methods, acceptance rules, and marking, packaging, transportation and storage of fireworks propellant. This standard applies to granular propellants made of potassium nitrate, sulfur and charcoal, which are used in fireworks, potted flowers, display shells and other aerial products.
2 Normative References
The clauses in the following documents become the clauses of this standard through reference in this standard. For any dated referenced document, all subsequent amendments (excluding errata) or revisions are not applicable to this standard. However, parties reaching an agreement based on this standard 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 standard. GB190 Dangerous Goods Packaging Marking
GB/T191 Pictorial Marking for Packaging Storage and Transportation
GB/T1918-1998 Industrial Potassium Nitrate
GJB1047.3 Black Powder Test Method Determination of Sulfur GJB1047.4 Black Powder Test Method Determination of Charcoal QB/T1941.5—1994 Determination of Moisture Absorption of Fireworks and Firecrackers QB/T1941.6--1994 Determination of Flame Sensitivity of Fireworks and Firecrackers 3 Terms and Definitions
The following terms and definitions apply to this standard. 3.1
Launch force
The work done by 1.0g propellant
The horizontal distance over which a 500g object is thrown at an angle of 45°. 3.2
Flame sensitivity
The 50% ignition distance of granular propellant under the action of a fixed jet flame. 4'Technical requirements
4.1Appearance
Black or gray-black, uniform and shiny, without visible impurities, no agglomeration, and crystallized potassium nitrate white frost and sulfur spots are not allowed on the surface of the pellets.
4.2Particle size requirements
See Table 1.
NY/T 757--2003
Mesh size/mm
Table 1 Propellant size, sieve aperture, and particle size requirements Grain
Upper sieve residue S+/（%)
Superior product
Qualified product
Degree/（%)
Lower sieve S../（%)
Superior product
Qualified product
Approximate value of particle size/mm
Propellants are divided into 4 categories according to particle size, and the particle range is expressed by the mesh size of the upper and lower sieves. The (vibrating) sieves used by manufacturers can refer to the mesh size in Table 1.
4.3 Other technical indicators
Should meet the requirements of Table 2.
Potassium nitrate content/(%)
Sulfur content/(%)
Carbon content/(%)
Water content/(%)
Moisture absorption rate/(%)
Medicine dust/(%)
Emission power/(m/g)
Flame sensitivity (Hso)/cm
5 Test method
5.1 AppearancebZxz.net
Superior product
75.0±1.0
10.0±1.0
15.0±1.0
Qualified products
75.0±1.5
10.0±1.5
15.0±1.5
Take 3.0g of propellant and spread it evenly on white paper. The propellant particles observed should be black or gray-black, with uniform and shiny color. If there are visible impurities and lumps, and crystallized potassium nitrate white frost and sulfur spots on the surface of the particles, if one or more of these items are present, the appearance test item is judged as unqualified.
5.2 Particle size
According to the product specifications, select the experimental sieve specifications required by Table 3 (the sieve material is brass). Table 3 Experimental sieve specifications
Product specifications
Upper sieve size/mm
$200×50-8/2
$200×50-5.6/1.6
$200×50-2.8/1.12
$200×50-1/0.56
Lower sieve size/mm
$200×50-5.6/1.6
Φ200×50-2.8/1.12
$200×50-0.5/0.9
$200X50-0.25/0. 16
Connect the upper sieve, lower sieve and chassis and install them on the vibrating sieve machine. Weigh 100.0g of sample and pour it into the upper sieve. Use a soft brush to spread it flat. Start the vibrating sieve machine. After vibrating for 2 minutes, remove the upper sieve and continue vibrating for 1 minute. Weigh the upper sieve residue and the lower sieve out on the analytical balance for 2
respectively. Determine twice in parallel and take the average value. Calculate according to formula (1) and formula (2))m+×100%
m= ×100%
Where:
-mass fraction of upper sieve residue, %;
mass of upper sieve residue, in grams (g); -mass of sample weighed, in grams (g); S
mass fraction of lower sieve out, %,
mass of lower sieve out, in grams (g). 5.3 Determination of potassium nitrate content
5.3.1 Preparation of test solution
NY/T 757--2003
(2)
Weigh 1.5g±2mg of the sample into a 100mL beaker, add 40mL of distilled water, stir at 50℃80℃ until the sample is powdered, stir for 1min, filter while hot into a 500mL volumetric flask, wash and transfer with 50℃ distilled water, cool to room temperature, dilute to scale, and shake well.
5.3.2 Determination
The determination shall be carried out in accordance with "4.1 Determination of potassium nitrate content" in GB/T1918-1998. The test solution preparation shall be carried out in accordance with the above 5.3.1, replacing 4.1.3.1 in GB/T1918-1998. 5.4 Determination of sulfur content
Perform according to GJB1047.3.
5.5 Determination of carbon
According to GJB1047.4.
5.6 Moisture
Weigh about 10g±2mg of sample in a weighing bottle (50mm×30mm) at 100℃, place in a constant temperature drying oven at 60℃ for 4h, take out, cool to room temperature in a dryer and weigh, measure in parallel, and take the average value. The sample is reserved for moisture absorption test. Calculate according to formula (3):
W--—moisture content, %;
- m2 × 100%
-The mass of the weighing bottle and sample before drying, in grams (g); the mass of the weighing bottle and sample after drying, in grams (g); the mass of the weighed sample, in grams (g). 5.7 Moisture absorption rate
Place the sample with the moisture content determined in a desiccator filled with saturated potassium nitrate solution, and the test method shall be carried out in accordance with the requirements of QB/T1941.5-1994. Calculate according to formula (4):
, X= ms=m2 ×100%
Wherein:
Moisture absorption rate of the sample, %;
-The mass of the sample and the weighing bottle after moisture absorption, in grams (g);-The mass of the sample and the weighing bottle after drying, in grams (g), m is the mass of the sample, in grams (g). (4)
NY/T 757---2003
5.8 Medicinal dust
Weigh about 200g ± 0.2g of the sample into a test sieve (made of brass) with a specification of Φ200×50-0.1/0.08, vibrate on a vibrating sieve machine for 2 minutes, weigh the sieve residue, measure in parallel, and take the average value. Calculate according to formula (5): m-ml×100%
Where:
-content of medicinal dust, %;
Weighed sample mass, in grams (g); mt--mass of sieve residue, in grams (g). 5.9 Launch force
In an open-air venue with a wind speed of less than level 3, on a clean soft sandy ground, place the launch base horizontally, and ensure that the front of the launch direction is not less than 35.0m above the ground, in the launch tube (dimension requirements as shown in Figure 1, the launch tube and the launch cap are made of brass, inserted into a slot tube during measurement, the slot tube forms an angle of 45°±2° with the fixed base, and the launch cap weighs 500g±10g. The joint between the launch tube and the launch cap and the inside of the launch tube must be kept clean, and can be wiped with engine oil, and the oil is removed and placed in a dryer. A 50mm±5mm long safety fuse is pre-inserted into the small hole at the bottom, 1.50g±0.01g of propellant is poured into the launch tube, shaken upright twice, the launch cap is put on, and inserted into the slot tube on the fixed base, the fuse is ignited, and the horizontal throwing distance of the launch cap is measured. The ground projection point of the launch tube mouth to the ground mark of the launch cap is the launch distance. Measure 7 times in a row, remove a maximum value and a minimum value, and take the average value of the remaining 5 times. Calculate according to formula (6): Ss
F= 5×1.50
Where:
-launching force, in meters per gram (m/g); ss
-the sum of the remaining 5 launch distances, in meters (m). Launch cap
5.10 flame sensitivity
launch tube
in millimeters
lead hole
·（6）
The size of the flame sensitivity instrument sample is adjusted to: d6.5mm×3.5mm; sample requirements: directly take the granular sample and fill the sample cup. The rest is according to Q B/T1941.6—1994 test method. 4
6 Acceptance rules
6.1 Inspection classification
6.1.1 Type inspection
NY/T757-—2003
The first batch, appraisal batch, production batch resumed after 2 months of suspension, supervision inspection, major changes in process and raw materials, and safety accidents, the product quality should be comprehensively assessed.
6.1.2 Factory inspection
Inspection conducted during the acceptance of each batch of products. || tt||6.2 Inspection items
6.2.1 Type inspection items
Appearance; particle size; mass fraction of potassium nitrate; mass fraction of sulfur; mass fraction of carbon; moisture; moisture absorption rate; powder dust; emission power; flame sensitivity; correct packaging.
6.2.2 Factory inspection items
Appearance; particle size; mass fraction of potassium nitrate; mass fraction of sulfur; mass fraction of carbon; moisture; powder dust; emission power; correct packaging. 6.3 Batch
No. 1 to No. 3 propellants, each batch shall not be less than 100 0kg, not more than 10000kg: No. 4 propellant is not less than 500kg, not more than 5000kg per batch.
6.4 Sampling
Use random sampling method, no less than 5 sampling points, and take samples of 1600g ± 50g. After safely mixing the samples, they are equally packed in two clean, dry ground-mouth bottles. Sampling labels are attached to the bottles. The content should include: factory name, product name, specifications, batch number, batch, sampling date, name of the sampler, etc. One bottle is used for testing and the other bottle is kept for three months. 6.5 Processing of inspection results
If one or more indicators of the inspection results do not meet the requirements, re-inspection will be carried out according to double sampling. If one or more indicators still do not meet the requirements, the entire batch of products cannot be accepted.
For the above-mentioned products that cannot be accepted, the manufacturer can repair the non-conforming items. After the repair, if one or more indicators still do not meet the requirements after inspection, the entire batch of products will be destroyed. 6.6 Acceptance
The finished propellant shall be inspected and accepted by the quality inspection department of the manufacturer. After acceptance, the qualified product mark shall be affixed (printed) on the product packaging box. 7 Marking, packaging, transportation and storage
7.1 Marking
The packaging box shall have firm and clear markings, including: factory name, factory address, product name, model, net weight, batch number, production date, "dangerous goods" mark and "heat-afraid" and "humidity-afraid" marks specified in GB190 and GB/T191. 7.2 Packaging
Double-layer packaging is adopted: the inner packaging adopts polyethylene plastic film bags with a thickness of 0.08mm ± 0.01mm; the outer packaging adopts corrugated paper boxes with no less than five layers, and the net weight of each box of products is 25kg ± 0.25kg or 50kg ± 0.5kg (50kg must be packed in wooden boxes), and it shall comply with the standard regulations for dangerous goods packaging.
7.3 Transportation
Special personnel and vehicles shall be used for escort, and there shall be cover to prevent rain, moisture, accidental throwing, etc.; be careful when handling, and do not hit, and keep away from fire and sparks. And strictly abide by the relevant national regulations on the transportation of dangerous goods. 7.4 Storage
Store in a cool and dry place, and prevent heat, moisture or sunlight exposure. The warehouse should be dry and ventilated, the ground should be cast with asphalt, and the column feet should be padded. The relative humidity in summer shall not exceed 85%, and the storage temperature shall not exceed 30℃. Dehumidification can be done by lime moisture absorption method, and electric dehumidifiers are prohibited. 53 Transportation
Special personnel and special vehicles shall be used for transportation. There shall be a cover to prevent rain, moisture, accidental throwing, etc.; be careful when handling, and avoid collisions. Keep away from fire and sparks. And strictly abide by the relevant national regulations on the transportation of dangerous goods. 7.4 Storage
Store in a cool and dry place to prevent heat, moisture or sunlight exposure. The warehouse should be dry and ventilated. The ground should be cast with asphalt and the column feet should be padded. The relative humidity in summer shall not exceed 85%, and the storage temperature shall not exceed 30℃. Dehumidification can be done by lime moisture absorption method. Electric dehumidifiers are prohibited. 53 Transportation
Escort by a dedicated person and vehicle, with cover to prevent rain, moisture, accidental throwing, etc.; be careful when handling, do not hit, keep away from fire and sparks. And strictly abide by the relevant national regulations on the transportation of dangerous goods. 7.4 Storage
Store in a cool and dry place, prevent heat, moisture or sunlight exposure, the warehouse should be dry and ventilated, the ground should be cast with asphalt, the column foot should be padded, the relative humidity in summer should not exceed 85%, the warehouse temperature should not exceed 30℃, dehumidification can be done by lime moisture absorption method, electric dehumidifier is prohibited. 5
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