Some standard content:
Chemical Industry Standard of the People's Republic of China
Rubber sponge carpet padding
Question content and scope of application
HG/T 2015-91
This standard specifies the structure, specifications, technical requirements, inspection methods, etc. of rubber sponge carpet padding (hereinafter referred to as padding). This standard applies to carpet sponge padding made of rubber 2 Reference standards
GB527 General requirements for physical tests of vulcanized rubber GB528 Determination of tensile properties of vulcanized rubber
GB6669 Determination of compression permanent deformation of soft foam polymer materials 3 Structure, classification and specifications
3.1 Structure
There are many structural forms of padding, mainly flat type and non-flat type. 3.2 Classification
According to the performance of padding, it can be divided into Class A and Class B.
Class A: used in family bedrooms, living rooms, living rooms, etc. Class B: used in public places, such as conference halls, hotel corridors, etc. 3.3 Specifications and dimensions
Specific specifications and dimensions of the gasket shall be agreed upon by both parties. The thickness shall be greater than 3mm (the thickness of non-flat gaskets includes the pattern height). The width deviation shall not exceed ±20mm. 4 Technical requirements
4.1 Physical and mechanical properties of gasketsbZxz.net
4.1.1 Class A shall comply with the provisions of Table 1.
Performance items
Mass of gasket per square meter, kg/m2
Density, kg/m2
Compressive stress, kPa
Compression permanent deformation, %
Hot air aging
Tensile strength, MPa
4.1.2 Class B shall comply with the provisions of Table 2.
135±2℃×24h
100±1℃×24h
Approved by the Ministry of Chemical Industry of the People's Republic of China on 1991-06-27
Qualified products
Does not break after bending
5.5×10-2
Implemented on 1991-12-01
Mass of cushion per square meter, kg/m2
Density, kg/m2
Compression stress, kPa
Compression permanent deformation, %
Hot air aging
Tensile strength, MPa
4.1.3 Density test is not required for non-flat lining. 4.2 Surface quality of each grade of lining
Surface quality shall comply with the provisions of Table 3.
Defect name
Uneven edge
4.3 Color and structure of lining
HG/T 2015—91
135±2℃×24h
100±1℃×24h
Not allowed
No break after bending
5.5×10-2
Qualified products
No break after bending
5.5×10-2
Each area shall not exceed 100cm, and two joints shall be allowed for every 3m2, and delamination and opening shall not be allowed
Within every 5m length, each side shall not deviate from the edge reference line ±1cm. The color and structure of the lining shall be agreed upon by the supply and demand parties. 5 Test method
5.1 The surface quality of the gasket is inspected by visual inspection and measuring tools. 5.2 Sampling and preparation method of the gasket:
5.2.1 Randomly select ~ roll samples from the batch submitted for inspection. 5.2.2 Select a uniform quality part from the end of the sample and cut a long strip with a width of 200mm (or wider as needed), the length of which is the width of the roll sample.
5.2.3 Draw a line 150mm from each edge of the width (i.e. perpendicular to the rolling) direction, and remove the part outside the line. Divide the part into three equal parts within these two lines.
5.2.4 Cut two 100mm×100mm test pieces from each of the above three areas, or cut square test pieces of appropriate specifications as needed.
5.2.5 Cut three 50mm×100mm test pieces from the remaining sample. 5.3 Specifications and dimensions of the gasket:
5.3.1 The width and length are measured with a tape measure with an accuracy of 1mm. 5.3.2 The thickness is measured by measuring six 100mm×100mm samples separately with an accuracy of 0.02mm. Apply a pressure of 1.5kPa on a circular pressure base with a size of 650mm2. The force should be applied slowly without impacting the sample. Then read the readings immediately and calculate the average of the six readings.
5.4 Physical and mechanical properties of the gasket:
5.4.1 Gasket mass per square meter:
Weigh six 100mm×100mm gasket samples separately with a balance and record their mass. Accurate to 0.01g, calculate the average mass of the six samples, expressed in kilograms, and divide it by the area of a single sample, i.e. 0.01m2, to obtain the gasket mass per square meter in kilograms per square meter 226
(kg/m2).
5.4.2 Density:
HG/T 2015—91
Weigh six 100mm×100mm flat pad samples respectively, accurate to 0.01g. Measure the thickness of the pads one by one, accurate to 0.02mm. Calculate the density of each sample using formula (1) and take the average of the six data. p=100m
Where: β
Density, kg/m2
Mass, nominal,
Thickness, mm.
5.4.3 Compressive stress:
Test with a sponge hardness tester.
Cut each 100mm×100mm pad sample into four 50mm×50mm or test pieces specified by the instrument. Stack enough test pieces into two pieces approximately 25mm thick and cut off the excess edges. Place the laminated specimen on a pressure base of the testing machine that is larger than the surface area of the specimen, apply a pressure of 1.5 kPa, and measure the total thickness of the laminated specimen. Compress the laminated specimen to 75 ± 1% of the original thickness, and immediately record the pressure required to compress the laminated specimen to this thickness. Calculate the compressive stress according to the following formula (2). Record the average of the two test results. A
Where: Cr—compressive stress, kPa,
A-pressure, kN;
B——area, m2;
D—pressure of -1.5 kPa.
5.4.4 Compression permanent deformation:
Compress the specimen to 50 ± 1% of the thickness, without using a glass sheet interlayer, and stack the specimens in sequence with the upper and lower surfaces connected. The recovery time is 4 to 6 hours. Other test conditions are carried out in accordance with the provisions of GB6669. The test adopts method A. 5.4.5 Hot air aging:
Place three 50mm×100mm gasket specimens (non-flat gaskets are made of semi-finished rubber materials with a thickness of 2~4mm) in a circulating air aging box at a specified temperature for 24h. After taking out, wait for the specimen to cool to room temperature and bend it 180° until the two ends of the specimen touch each other. Check the bending part, and obvious cracks are allowed, but no breakage is allowed. 5.4.6 Tensile strength:
Cut the specimen made of semi-finished rubber materials into a dumbbell shape, and its specifications and dimensions are shown in the figure. The thickness of the specimen is 12.5±1.5mm. The test conditions and methods shall be carried out in accordance with the provisions of GB528.
6 Acceptance rules
HG/T 2015-91
6.1 The gasket shall be accepted by the quality inspection department of the manufacturer. The manufacturer shall ensure that the products shipped meet the technical requirements of this standard. 6.2 The padding is in batches of 30,000m. If the padding is less than 30,000m, it is in batches of 15 days' output. 6.3 Before the padding leaves the factory, it shall be 100% inspected for width, length and surface quality according to the provisions of this standard. 6.4 The thickness, padding mass per square meter, density, compressive stress, compression permanent deformation, hot air aging, tensile strength, etc. of the padding shall be sampled and tested in batches. If one of the test results is unqualified, double the sample shall be taken to retest the item. If the retest is still unqualified, the batch of products shall be unqualified. Marking, packaging, transportation and storage
7.1 Each roll of packaging bag shall be marked with the product name, manufacturer name, trademark, quantity, production date, etc., and shall be accompanied by a quality certificate (including product name, quantity, production date, inspection employee number, etc.). 7.2 The packaging of the padding shall be handled according to the agreement between the supply and demand parties. 7.3 The padding shall be protected from wind, rain, snow and sunlight during transportation; it is strictly forbidden to use iron hooks during loading and unloading to prevent damage to the packaging bag and the product. 7.4 Storage:
7.4.1 The pads should be stored in a well-ventilated warehouse with a temperature of -15~+35℃ and a relative humidity of no more than 85%. 7.4.2 The pads should not come into contact with acids, alkalis, oils or other substances harmful to rubber to avoid product contamination and deterioration. 7.4.3 The pads should not be heavily pressed and the stack height should not exceed 1.5m, when placed, it should be 20mm above the ground, 1.5m away from heat sources, avoid direct sunlight, and turn the stack over every two months.
7.4.4 From the date of leaving the factory, within a storage period of no more than half a year, the physical and mechanical properties of the cushion should comply with the provisions of this standard. Additional remarks:
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 Beijing Rubber Products Design Institute. This standard was drafted by Beijing Rubber Products Design Institute and Beijing Chemical Building Materials. The main drafters of this standard are Zhang Chengyan, Liu Bing, Li Jing, and Li Zhihong. This standard refers to the American Society for Testing and Materials standard ASTMD3676-78 (83) "Microporous rubber lining for carpet backing". 228
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