Some standard content:
Chemical Industry Standard of the People's Republic of China
Rubber Basketball, Volleyball, Football
1 Subject Content and Scope of Application
HG 2290-92
This standard specifies the classification and specifications, technical requirements, test methods, inspection rules, etc. of rubber basketball, volleyball, football (hereinafter referred to as rubber ball).
This standard applies to rubber basketball, volleyball, football with rubber veneer and reinforcement layer. 2 Reference standards
GB528 Determination of tensile properties of vulcanized rubber
GB 5312
Test method for rubber Shore A hardness
GB3512 Test method for hot air aging of rubberGB6388 Shipping and receiving marks for transport packaging
GB6543 Corrugated paper box
3 Product classification and specifications
3.1 Classification
3.1.1 Products are divided into basketball (B), volleyball (V), and football (F) according to their varieties. 3.1.2 Products are divided into No. 7, No. 6, No. 5, No. 4, No. 3, etc. according to different specifications and sizes. 3.1.3 Products are divided into winding balls and patch balls according to their skeleton structure. 3.2 Specifications
The specifications of the rubber ball shall comply with the provisions of Table 1.
Circumference
Excellent product!
Circumference difference
First-class quality goods
First-class quality goods
749~762749780
724~737720~740
680~700
5649672649-672
610~640
560 ~600
15|686~711|675~711]
4625-645615-650
535560
Circumference
-Qualified products
560~641
1560-650750-780750~780| | tt | 245 580600560~600
397~454397~468680~710675-710340~397340~405620~650615~650280~345540~560535~560
Note: Special specifications and styles and colors of rubber balls are determined according to user needs. Approved by the Ministry of Chemical Industry of the People's Republic of China on 1992-06-01250
Circumference difference
First-class qualified products
Qualified products
567~650567-665
560~580560~615
480-500|480-535
250~280250~300
1230 ~250230~270
200~230200~245
1395-4531396-468
350~3801350~405
280~310|280~345
1993-10-01Implementation
3.3 Product marking
3.3.1 Marking method
HG 2290—92
Products are marked in the following order: product name, material, specification, model, standard number. 3.3.2 Marking example
According to Article 3.1, No. 7 rubber basketball is marked as: B
Technical requirements
HG2290
The finished product performance of the rubber ball shall meet the requirements of Table 2. Table 2
Air pressure drop rate, %
Rebound height, cm
Number of impacts, times
Circumference after impact, mm
Circumference difference after impact, mm
Ball quality difference after impact, g
Superior product
120~140
10 000
First-class product
120~160
Note: Pressure impact resistance is only required for adult rubber basketballs; if there are special needs, it shall be implemented according to the requirements of the purchaser. 4.2
The appearance quality of the rubber ball shall comply with the requirements of Table 3. Table 3
Defect name
Stains, uneven color
Exposure line (cloth), spherical bubble impurities
Spherical surface defects
Superior products
Not obvious at a sight distance of 0.5m
Not allowed
Basketball 1cm2 range, not more than 3cm globally, but the same piece shall not exceed
1.5cm2, football, volleyball 1cm2 range, not more than 3cm2 globally, but the same piece shall not exceed 1cm2
First-class products
Not obvious at a sight distance of 1m
Basketball 1 .5cm2 range, globally not
more than 6cm2, but the same piece shall not exceed
3cm2, football and volleyball 1cm2 range,
standard number
-specification model
one material
product name
qualified product
qualified product
1m sight distance obvious
completely repaired
basketball 2.5cm2 range, globally not
more than 8cm2, but the same piece shall not exceed
4cm2, football and volleyball 2cm2 range,
more than 5cm2 globally, but the same piece not!
Globally not more than 7cm2, but the same piece shall not exceed 2.5cm2
and shall not exceed 3.5cm2
4.3 The physical properties of the semi-finished rubber balls shall comply with the provisions of Table 4, and special needs shall be implemented according to the supply and demand agreement. 251
Tensile strength, MPa
Elongation at break, %
Hardness (Type A), degree
Hot air aging
(70±1℃X48h)
HG 2290-92
Tensile strength change rate (reduction), %
Elongation at break change rate (reduction), %
Note: When more than 20% of synthetic rubber is added, the tensile strength and elongation at break before and after aging shall not be less than 80% of the values in Table 4. 5 Test method
5.1 Finished product test
5.1.1 Inflation pressure
The pressure of the rubber ball is measured with a barometer with a measuring range of 0 to 0.16 MPa and an accuracy of 1.5. The inflation pressure is in accordance with Table 5. Table 5
Inflation pressure
5.1.2 Circumference
Measure the circumference of the rubber ball with a soft ruler at the inflation pressure specified in 5.1.1, with an accuracy of 1mm. Select any three circumferences, the difference between the maximum and minimum values is the circumference difference, the average of the three measurements is the circumference, which should comply with the provisions of Table 1.5.1.3 Mass
The mass of the rubber ball is weighed with a scale with a sensitivity of 1g, which should comply with the provisions of Table 1. 5.1.4 Air tightness
After the rubber ball is inflated according to the inflation pressure specified in 5.1.1, it is parked at room temperature for 24 hours, checked with a barometer, and calculated according to the following formula, which should comply with the provisions of Table 2.
Air pressure drop rate (%) - air pressure before parking = air pressure after parking × 100 air pressure before parking
5.1.5 Rebound height
Under the inflation pressure specified in 5.1.1, place the rubber ball with its mouth facing upward at a distance of 180cm from the bottom edge of the chassis, let it fall freely, and measure the rebound height of its upper edge. Each ball is measured 5 times, and the average value is taken, which should comply with the provisions of Table 2. The chassis should be a hard wooden board or a non-metallic material with equivalent hardness. 5.1.6 Pressure impact resistance test
The pressure impact resistance test of adult rubber basketballs shall be carried out in accordance with the provisions of Appendix A (Supplement). The test results shall comply with the provisions of Table 2. 5.1.7 Appearance quality
The appearance quality of rubber balls shall be visually inspected with relevant measuring tools and shall comply with the provisions of Table 3. 5.2 Semi-finished product test
The physical properties of semi-finished rubber balls shall be tested according to the following methods and shall comply with the provisions of Table 4. 5.2.1 The tensile strength and elongation at break tests shall be carried out in accordance with the provisions of GB528, using a type 1 cutter. 5.2.2 The hardness test shall be carried out in accordance with the provisions of GB531, and 5.2.3 The hot air aging test shall be carried out in accordance with the provisions of GB3512. 252
6 Inspection rules
6.1 Inspection classification
The inspection of rubber balls is divided into inspection and type inspection. 6.1.1 Factory inspection
HG 2290—92
Inspection items: specifications, air tightness, rebound height, appearance quality. 6.1.2 Type inspection
Type inspection is carried out on all items required by this standard in accordance with the relevant provisions of Article 6.6.1 of GB1.3. During normal production, inspection should be carried out once every six months.
6.2 Sampling and judgment ruleswwW.bzxz.Net
Factory inspection is carried out on 10,000 rubber balls of the same variety, specification and structure as a batch, and type inspection is carried out on half a year's products as a batch.
6.2.1 Inspection of specifications and appearance quality
100 samples are randomly selected from each batch for inspection in accordance with the provisions of Articles 5.1.2, 5.1.3 and 5.1.7 of this standard. If 10 or more samples do not meet the requirements of the corresponding grade index, the batch of products will be downgraded by one grade. 6.2.2 Inspection of air tightness
Randomly select 10 samples from the samples that have passed the inspection in Article 6.2.1 and inspect them according to the provisions of Article 5.1.4 of this standard. If 2 or more samples do not meet the requirements of the corresponding grade index, the batch of products will be downgraded by one grade. 6.2.3 Inspection of rebound height
Randomly select 5 samples from the samples that have passed the inspection in Articles 6.2.1 and 6.2.2 and inspect them according to the provisions of Article 5.1.5 of this standard. If 2 samples do not meet the requirements of the corresponding grade index, 5 more samples will be selected for re-inspection. If there are still 2 samples that do not meet the requirements of the corresponding grade index, the batch of products will be downgraded by one grade.
6.2.4 Test of pressure impact resistance
According to Article 6.1.2, 2 adult basketballs are randomly selected from the samples that meet the corresponding superior and first-class grades tested in Articles 6.2.1 to 6.2.3, and tested in accordance with Article 5.1.6 of this standard. If one of the samples does not meet the corresponding grade index, 2 more samples are selected for re-testing. If there is still one sample that does not meet the corresponding grade index, the batch of products is downgraded to first-class or qualified products. 6.2.5 Physical property test of rubber
Aging performance is tested once a quarter, and other items are tested once a month. One rubber is selected each time and the specified items are tested. If one item is unqualified, double the samples are taken for re-testing of the item. If the re-test is still unqualified, the rubber during that period is determined to be unqualified, and the products produced with this batch of rubber should be unqualified products.
7 Marking, packaging, transportation and storage
7.1 Marking
The product shall have the following markings: manufacturer name, trademark, product mark, quality grade, production date, inspector code, etc. 7.2 Packaging
The product that has passed the inspection shall be accompanied by an inspection certificate. Packaging shall be carried out in accordance with the agreement between the supply and demand parties. The packaging box and graphic markings shall be implemented in accordance with the relevant provisions of GB6543 and GB6388. 7.3 Transportation and storage
7.3.1 During transportation and storage, the product shall be kept away from sunlight and rain, kept clean, and prohibited from contact with substances that affect the quality of rubber, such as acids, alkalis, oils, organic solvents, etc. There shall be no punctures, no heavy pressure, and it shall be 1m away from heat sources. 7.3.2 The product shall be stored in a ventilated warehouse, the indoor temperature shall be maintained at 0~37℃, and the relative humidity shall be maintained at 50%~85%. 7.3.3 Under the conditions specified in Articles 7.3.1 and 7.3.2 of this standard, the manufacturer shall ensure that the performance of the product complies with the requirements of this standard within a storage period of no more than one year from the date of production. 253
A1 Method principle overview
HG 2290—92
Appendix A
Pressure impact resistance test method
(Supplement)
This test is to fill the rubber ball with compressed air to the air pressure specified in Article 5.5.1 of the standard text, and continuously impact the rubber ball to determine the pressure impact resistance of the rubber ball.
A2 Test equipment and requirements
The test equipment consists of two drum wheels with a diameter of $564 mm that rotate in opposite directions at a certain speed with a certain spacing and a rebound plate (see Figure A1). During the test, the rubber ball is forced out from the middle of the two rotating drum wheels, hits the rebound plate, and then returns to the drum box along a certain trajectory to impact again.
Drum: Drum speed 320r/min;
Drum distance (rubber ball diameter × 3/4) cm.
Rebound board: A rubber board of 45mm×55mm. Placed 2m away from the center of the drum at an angle of 60° to the ground. Figure A1
1—Rebound board; 2—Drum; 3—Rubber ball; 4 Drum box A3 Test procedure
A3.1 Fill the rubber ball with compressed air to the air pressure specified in Article 5.1.1 of the standard text, measure and record the circumference and mass of the rubber ball. A3.2 Adjust the drum speed and drum distance according to the provisions of A2, place the rubber ball in the drum box, start the machine, and impact the rubber ball. A3.3 During the impact process, if the ball does not hit the rebound board and falls to the ground halfway, it can be placed in the drum box to continue impacting, and the number of impacts can be accumulated.
A4 Calculation of test results
HG 2290-92
After the number of impacts specified in the standard, measure the circumference and mass of the rubber ball and calculate according to the following method. The results should comply with the provisions of Table 2 of this standard.
A4.1 Circumference after impact
Measure the circumference after impact with a soft ruler, accurate to 1mm. Select any three circumferences and take their average. A4.2 Circumference difference after impact
Measure any three circumferences after the impact of the rubber ball. The difference between the maximum and minimum values is the circumference difference after impact, in millimeters, accurate to 1mm.
A4.3 Ball mass difference after impact
Weigh the mass of the rubber ball after impact and subtract the mass of the rubber ball before impact. The difference is the ball mass difference after impact, in grams, accurate to 1g.
Additional Notes:
This standard was 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 Beijing Rubber Product Design Institute. This standard was drafted by Beijing Rubber Product Design Institute and Shanghai Yonghe Rubber Factory. The main drafters of this standard are Liu Bing and Deng Wei. From the date of implementation of this standard, the former Ministry of Chemical Industry standard HG4-824-76 "Rubber Ball" will be invalid. 2552 Packaging
Products that have passed the inspection shall be accompanied by an inspection certificate. Packaging shall be carried out in accordance with the agreement between the supply and demand parties. The packaging boxes and graphic signs shall be implemented in accordance with the relevant provisions of GB6543 and GB6388. 7.3 Transportation and storage
7.3.1 During transportation and storage, the product should be kept away from sunlight and rain, kept clean, and prohibited from contact with acids, alkalis, oils, organic solvents and other substances that affect the quality of rubber. There shall be no punctures, no heavy pressure and it shall be kept more than 1m away from heat sources. 7.3.2 The product shall be stored in a ventilated warehouse, the indoor temperature shall be maintained at 0~37℃, and the relative humidity shall be maintained at 50%~85%. 7.3.3 Under the conditions specified in Articles 7.3.1 and 7.3.2 of this standard, the manufacturer shall ensure that the performance of the product complies with the requirements of this standard within a storage period of no more than one year from the date of production. 253
A1 Method principle overview
HG 2290—92
Appendix A
Pressure impact resistance test method
(Supplement)
This test is to fill the rubber ball with compressed air to the air pressure specified in Article 5.5.1 of the standard text, and continuously impact the rubber ball to determine the pressure impact resistance of the rubber ball.
A2 Test equipment and requirements
The test equipment consists of two drum wheels with a diameter of $564 mm that rotate in opposite directions at a certain speed with a certain spacing and a rebound plate (see Figure A1). During the test, the rubber ball is forced out from the middle of the two rotating drum wheels, hits the rebound plate, and then returns to the drum box along a certain trajectory to impact again.
Drum: Drum speed 320r/min;
Drum distance (rubber ball diameter × 3/4) cm.
Rebound board: A rubber board of 45mm×55mm. Placed 2m away from the center of the drum at an angle of 60° to the ground. Figure A1
1—Rebound board; 2—Drum; 3—Rubber ball; 4 Drum box A3 Test procedure
A3.1 Fill the rubber ball with compressed air to the air pressure specified in Article 5.1.1 of the standard text, measure and record the circumference and mass of the rubber ball. A3.2 Adjust the drum speed and drum distance according to the provisions of A2, place the rubber ball in the drum box, start the machine, and impact the rubber ball. A3.3 During the impact process, if the ball does not hit the rebound board and falls to the ground halfway, it can be placed in the drum box to continue impacting, and the number of impacts can be accumulated.
A4 Calculation of test results
HG 2290-92
After the number of impacts specified in the standard, measure the circumference and mass of the rubber ball and calculate according to the following method. The results should comply with the provisions of Table 2 of this standard.
A4.1 Circumference after impact
Measure the circumference after impact with a soft ruler, accurate to 1mm. Select any three circumferences and take their average. A4.2 Circumference difference after impact
Measure any three circumferences after the impact of the rubber ball. The difference between the maximum and minimum values is the circumference difference after impact, in millimeters, accurate to 1mm.
A4.3 Ball mass difference after impact
Weigh the mass of the rubber ball after impact and subtract the mass of the rubber ball before impact. The difference is the ball mass difference after impact, in grams, accurate to 1g.
Additional Notes:
This standard was 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 Beijing Rubber Product Design Institute. This standard was drafted by Beijing Rubber Product Design Institute and Shanghai Yonghe Rubber Factory. The main drafters of this standard are Liu Bing and Deng Wei. From the date of implementation of this standard, the former Ministry of Chemical Industry standard HG4-824-76 "Rubber Ball" will be invalid. 2552 Packaging
Products that have passed the inspection shall be accompanied by an inspection certificate. Packaging shall be carried out in accordance with the agreement between the supply and demand parties. The packaging boxes and graphic signs shall be implemented in accordance with the relevant provisions of GB6543 and GB6388. 7.3 Transportation and storage
7.3.1 During transportation and storage, the product should be kept away from sunlight and rain, kept clean, and prohibited from contact with acids, alkalis, oils, organic solvents and other substances that affect the quality of rubber. There shall be no punctures, no heavy pressure and it shall be kept more than 1m away from heat sources. 7.3.2 The product shall be stored in a ventilated warehouse, the indoor temperature shall be maintained at 0~37℃, and the relative humidity shall be maintained at 50%~85%. 7.3.3 Under the conditions specified in Articles 7.3.1 and 7.3.2 of this standard, the manufacturer shall ensure that the performance of the product complies with the requirements of this standard within a storage period of no more than one year from the date of production. 253
A1 Method principle overview
HG 2290—92
Appendix A
Pressure impact resistance test method
(Supplement)
This test is to fill the rubber ball with compressed air to the air pressure specified in Article 5.5.1 of the standard text, and continuously impact the rubber ball to determine the pressure impact resistance of the rubber ball.
A2 Test equipment and requirements
The test equipment consists of two drum wheels with a diameter of $564 mm that rotate in opposite directions at a certain speed with a certain spacing and a rebound plate (see Figure A1). During the test, the rubber ball is forced out from the middle of the two rotating drum wheels, hits the rebound plate, and then returns to the drum box along a certain trajectory to impact again.
Drum: Drum speed 320r/min;
Drum distance (rubber ball diameter × 3/4) cm.
Rebound board: A rubber board of 45mm×55mm. Placed 2m away from the center of the drum at an angle of 60° to the ground. Figure A1
1—Rebound board; 2—Drum; 3—Rubber ball; 4 Drum box A3 Test procedure
A3.1 Fill the rubber ball with compressed air to the air pressure specified in Article 5.1.1 of the standard text, measure and record the circumference and mass of the rubber ball. A3.2 Adjust the drum speed and drum distance according to the provisions of A2, place the rubber ball in the drum box, start the machine, and impact the rubber ball. A3.3 During the impact process, if the ball does not hit the rebound board and falls to the ground halfway, it can be placed in the drum box to continue impacting, and the number of impacts can be accumulated and calculated.
A4 Calculation of test results
HG 2290-92
After the number of impacts specified in the standard, measure the circumference and mass of the rubber ball and calculate according to the following method. The results should comply with the provisions of Table 2 of this standard.
A4.1 Circumference after impact
Measure the circumference after impact with a soft ruler, accurate to 1mm. Select any three circumferences and take their average. A4.2 Circumference difference after impact
Measure any three circumferences after the impact of the rubber ball. The difference between the maximum and minimum values is the circumference difference after impact, in millimeters, accurate to 1mm.
A4.3 Ball mass difference after impact
Weigh the mass of the rubber ball after impact and subtract the mass of the rubber ball before impact. The difference is the ball mass difference after impact, in grams, accurate to 1g.
Additional Notes:
This standard was 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 Beijing Rubber Product Design Institute. This standard was drafted by Beijing Rubber Product Design Institute and Shanghai Yonghe Rubber Factory. The main drafters of this standard are Liu Bing and Deng Wei. From the date of implementation of this standard, the former Ministry of Chemical Industry standard HG4-824-76 "Rubber Ball" will be invalid. 255
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