Some standard content:
Scope of application
National Standard of the People's Republic of China
Raw natural rubber-
Smoked sheets
UDC 678. 4. 032
GB 8089-87
This standard applies to sheets made of natural rubber latex by acid coagulation, sheeting, and smoke drying. Rubber blocks, unqualified rubber scraps cut from grades, foamed rubber, weak rubber, burnt rubber, sandwiched rubber, regenerated rubber, films without patterns and other miscellaneous rubber are not allowed in the rubber packages of smoked rubber sheets. This standard does not apply to films made of all or part of clear rubber. 2 Technical requirements
2.1 Grade Smoked Rubber Sheet (No.1RSS)
Each rubber package must be free of mold when packed, but it is allowed to find very slight traces of dry mold on the foreskin or at the junction of the foreskin and the rubber package surface at the time of delivery, but it does not penetrate into the rubber package. Oxidation spots or streaks, weak rubber, overheated rubber, smoke-impermeable rubber, smoke-excessive rubber, opaque and burnt rubber are not allowed. The goods delivered must be dry, clean, strong and solid rubber, and free from defects, resinous substances (rubber rust), fire bubbles, gravel, dirty packaging and any other foreign matter. However, it is allowed to have slightly scattered crumbs and scattered small bubbles of the size of a needle head to the extent shown in the physical standard sample.
2.2 Secondary Smoked Rubber Sheet (No.2RSS)
It is allowed to find slight rubber rust at the time of delivery, as well as a small amount of dry mold on the foreskin, the surface of the rubber package and the internal film. If there is a significant degree of rust or mold on the rubber bales, it shall not exceed 5% of the number of rubber bales sampled. Small bubbles of the size of a pinhead and tiny bark spots are allowed to the extent shown in the physical standard sample. Oxidation spots or streaks, weak rubber, overheated rubber, smoke-proof rubber, over-smoked rubber, opaque and burnt rubber are not allowed. The goods delivered must be dry, clean, strong and solid rubber, free from defects, fire blisters, gravel, dirty packaging and any other foreign matter other than those permitted by the above regulations.
2. 3 Grade 3 Smoked Rubber Sheet (No. 3 RSS)
It is allowed to have slight rust on delivery and a small amount of dry cuts on the foreskin, surface of the rubber bale and internal rubber. If there is a significant degree of rust or mold on the rubber bales, it shall not exceed 10% of the number of rubber bales sampled. Slight color depth differences, small bubbles and small bark spots are allowed to the extent shown in the physical standard sample. Oxidation spots or streaks, weak rubber, overheated rubber, smoke-impermeable rubber, over-smoked rubber, opaque and burnt rubber are not allowed. The goods delivered must be dry, strong rubber, free from defects, fire blisters, gravel, dirty packaging and other foreign matter other than those permitted by the above regulations.
2.4 Grade 4 Smoked Rubber Sheet (No.4 RSS)
It is allowed to have slight rubber rust on delivery, as well as a small amount of dry mold on the foreskin, surface of the rubber package and internal film. If rubber rust or dry mold appears on the rubber package to a significant extent, it shall not exceed 20% of the number of rubber packages sampled. Medium bark particles, bubbles, translucent spots, slight stickiness and slight over-smoked rubber are allowed in the quantity and size shown in the physical standard sample.
Oxidation spots or streaks, weak rubber, overheated rubber, smoke-impermeable rubber, excessive smoked rubber (exceeding the degree shown in the physical standard sample) and live packing approved by the Ministry of Agriculture, Animal Husbandry and Fisheries of the People's Republic of China on July 10, 1987
Implementation on January 1, 1988
burned rubber sheets are not allowed.
GB8089-87
The goods delivered must be dry and solid rubber, and free from defects, fire bubbles, gravel, packaging transfer and other foreign matter not permitted by the above provisions.
2.5 Grade 5 Smoked Rubber Sheet (No.5RSS)
It is allowed to find slight rubber rust at the time of delivery, as well as a small amount of dry mold on the foreskin, the surface of the rubber package and the internal rubber sheet. If there is a significant degree of rubber rust or dry mold on the rubber package, it is not allowed to exceed 30% of the number of rubber packages sampled. Large bark particles, bubbles and small fire bubbles, spots, smoked rubber and defects are allowed in the quantity and size shown in the physical standard sample. Mild smoked rubber is allowed. Oxidation spots or streaks, weak rubber, overheated rubber and burnt rubber are not allowed. The goods delivered must be dry and solid rubber, free from fire bubbles, gravel, dirty packaging and other foreign matter other than those permitted by the above regulations.
3 Inspection rules
3.1 Sampling method
The rubber bags marked with the same batch number are stacked according to grade. 5% of the total number of rubber bags of the same grade are randomly selected for large sample rubber bags. The better or worse rubber bags shall not be deliberately selected. The large sample rubber bags selected are neatly arranged in a unit of 20 bags, and the films in each unit are numbered in sequence. One small sample rubber bag is selected from each unit during inspection. Once the sampler decides on the number of the small sample rubber bag to be selected, the rubber bag shall be selected according to the number in each unit. When the number of rubber packs in each batch is less than 20, a small sample rubber pack shall be taken. The sample rubber pack shall be placed on the ground covered with clean plastic film or canvas, and the rubber pack shall be opened. Eight sheets of film shall be randomly taken from each pack and placed on the original rubber pack for inspection.
You can cut the rubber pack with a knife to take samples. If the temperature is very low and the rubber pack becomes hard, it is allowed to place the rubber pack in a greenhouse for heating, but the temperature shall not exceed 60℃.
3.2 Inspection method
Whether the quality of the delivered goods is consistent with the grade of the product mark can only be determined through appearance inspection. During the inspection, the appearance of the single film in the physical standard sample book and the single film peeled from the inside of the small sample rubber pack must be compared with each other in combination with the textual provisions of the technical requirements. If a single film cannot be peeled from the small sample rubber pack, if there is no discoloration, it should be considered that the rubber has a darker color after compression. During the inspection, there should be a bright light source to see through the defects inside the film. The inspector shall select one film with medium appearance quality from the eight films randomly selected from each sample rubber package, representing the average quality of the eight films as the rated film. Among the eight films with determined average quality, one film with one grade lower is allowed, but if there is a film with two grades lower, the film shall be taken as the rated film.
Then, the inspector shall weigh the rated films one by one and assess the grade. The downgraded rated films shall be properly preserved, and the inspection results and instructions shall be attached for re-inspection by the relevant parties. 3.3 Assessment of inspection results
The number of packages in the rubber packages of the batch number that meet each grade shall be calculated based on the number of 20 packages represented by each rated film, and the number shall be taken as the inspection result. 4 Packaging, coating and marking
4.1 Packaging specifications
4.1.1 The net weight of each rubber package including the rubber cover is 50kg. The length of the rubber package is 60±2cm, the width is 40±2cm, and the height is 30±2cm. 4.1.2 When the film is packed under pressure, it is allowed to sprinkle a small amount of talcum powder on the upper and lower sides of the packing box so that the pressurized rubber bag can be smoothly separated from the packing box.
4.1.3 Each face and corner of each rubber bag must be wrapped with the same type, same grade or higher quality film as the foreskin. If the foreskin has holes, a double layer of foreskin must be used. It is prohibited to tie metal belts, metal wires or non-metallic ropes inside and outside the foreskin. 66
4.2 Coating and coating solution
GB 8089--87
In order to overcome the adhesion of rubber bags during storage and transportation, and to ensure that the logo of the rubber bag has a bright background color, a layer of coating solution specified in this standard must be applied to the six faces of the rubber bag after the foreskin is wrapped. The coating solution is made by dissolving natural raw rubber in a solvent to make an adhesive solution, and then adding a mixture of solvent and talcum powder and stirring it thoroughly.
4.2.1 Preparation of adhesive solution
Weigh 0.5kg of clean and dry rubber pieces, put them into a container containing 10kg of petroleum solvent (distillation range is 143～275℃), soak for more than 36h, stir frequently, and after the natural raw rubber is completely dissolved, add 5kg of petroleum solvent, stir thoroughly until it is evenly mixed to form an adhesive solution, cover the container and set aside.
4.2.2 Preparation of talcum powder petroleum solvent mixture Put 20kg of petroleum solvent in another container, add 15kg of fine talcum powder, stir while adding, and prepare a uniform paste-like liquid, cover the container and set aside. If the volume per unit weight of talcum powder is relatively large, the dosage can be appropriately reduced to make the coating solution have better fluidity to facilitate coating.
4.2.3 Preparation and use of coating solution
Put the two solutions prepared in 4.2.1 and 4.2.2 into a container and mix them. Stir them thoroughly to form the coating solution. When using, prevent the talcum powder from sinking. Stir while coating to ensure uniform coating. This coating solution is enough to coat 100 bags of 50kg rubber bags. The coating should be uniform, and the solid weight of the coating solution on the surface of each rubber bag after drying should not exceed 250%. 4.3 Rubber bag marking
4.3.1 Preparation of marking solution
Mix 1 part of the adhesive prepared in 4.2.1 with 1 part of carbon black, stir thoroughly to form a paste, and make it obvious black and easy to apply with fluidity.
4.3.2 Use a stencil to apply the marking solution on the largest surface of each rubber package, so that the rubber package is marked with the type, grade, net weight, manufacturer name or code, and production date. Mark the grade mark on the two small sides of each rubber package. 4.3.3 The size of the marking font shall be uniformly stipulated by the rubber production management department, and the stencil shall be uniformly prepared and sold to the rubber production units. 5 Storage and transportation
5.1 Rubber packages should be stored and stacked according to type and grade, and placed on wooden boards at a height of more than 30 cm from the ground and more than 50 cm from the wall. The stacking height is 4 to 6 layers of rubber packages, and the stacking length is not limited. There should be a passage between each pile of rubber packages for removal and transportation. 5.2 Warehouses for stacking rubber bags should be well ventilated, dry and rainproof. The temperature in the warehouse should not exceed 35℃, and the relative humidity should be kept as low as possible. Rubber bags should not be exposed to direct sunlight. 5.3 Warehouses should be clean. Rubber bags should not come into contact with salts or oxides of copper and manganese, and should not be stored together with oils and flammable items. 5.4 Rubber bags should be transported in clean carriages and covered with tarpaulins to prevent sunlight or rain from causing the rubber to mold and deteriorate. 67
Skimmings
GB 8089--87
Appendix A
Explanation of Terms
(Supplement)
Film made from foam withdrawn from the liquid surface when latex is coagulated with acid. A. 2 Weak rubber
Also known as brittle rubber. Rubber that is easily torn or broken when the film is stretched sharply. A.3 Burnt sheets
Film that has been burned, oxidized, and turned black due to being too close to fireworks during smoking. A.4 Virgin rubber
Rubber that still retains a lot of original moisture and has a grayish-white surface. A.5 Bleached rubber
Rubber that has been damp and absorbed too much moisture. A.6 Skim latex
When latex is concentrated by a centrifuge, a concentrated latex with a dry rubber content of about 60% is obtained. The other part of the liquid containing about 5% dry rubber is called skim latex. A.7 Oxidized rubber
Rubber that is damaged or degraded due to the combination of rubber hydrocarbons and whey substances in the rubber with oxygen. A. 8 Heated rubber
Rubber with spots or streaks that become soft and sticky. A.9 Ungef-cured rubber Rubber that has not been completely dried during the fumigation or drying process. A. 10 Over-smoked rubber Rubber that has become almost opaque due to excessive smoke during the smokeless process. This specification does not include rubber that has been slightly burned due to being too close to fireworks during fumigation.
A. 11 Opaque sheets Film that is opaque (Grade 4 and Grade 5 smoked sheets are generally in this state). A.12 Dry rubber Rubber that does not show any signs of moisture based on appearance (see regenerated rubber, sandwich rubber and smoked rubber). 68
A.13 Clean
GB 8089-87
According to the appearance classification, compared with the physical standard samples of the first and second grade smoked rubber sheets, the amount of impurities does not exceed the level shown in the sample. A. 14 Strong rubber (Strong rubber) Rubber with deformation and tensile resistance A.15 Firm rubber (Firm rubber)
According to the appearance classification, it is very different from the state of weak rubber, and is a uniform, strong and firm rubber. A.16 Blemishes
Except for roller damage during sheeting, films with any defects, spots or damage are not allowed during grading. A. 17 Resinous matter (Rust) The surface of smoked rubber is covered with a layer of brown rust-like substance formed by bacteria decomposing non-rubber components in rubber. A.18 Blisters
During the rubber making process, gas is generated due to the decomposition of rubber, which forms bubbles on the surface and inside of the film with sticky inner surfaces. A.19 Sand
The rubber contains more or less loose small particles of quartz components. A.20 Bark specks or patticles The rubber contains bark specks or patticles and other foreign organic matter specks or patticles. A.21 Bubbles
During the rubber making process, due to the mixing of air into the latex or slight fermentation, small round bubbles with non-sticky inner surface are formed inside the rubber sheet. A.22 Dirty packing
Rubber bales with foreign debris such as grass, straw, rattan silk, paper, rags, sawdust or other foreign substances mixed in the rubber bales. A. 23 Foreign matter In natural rubber, any substance other than rubber hydrocarbons and natural substances inherent in latex is called foreign matter. A.24 Sound rubber Rubber without any defects and weaknesses after appearance grading. A. 25 Frothy sheets Rubber sheets that are over-fermented during the coagulation process, causing the entire sheet of film to be covered with bubbles and sticky bubbles, making it soft and deteriorated. A. 26 Mottled rubber Rubber) Rubber with darker spots, stains or streaks and spots formed by fungi. 69
A.27 Sticky rubber (Sticky rubber) Rubber with sticky, viscous or sticky. A.28 Sour and foul odors Odors caused by rubber corruption.
A.29 Discoloration (Discoloration)
GB8089-87
Refers to the phenomenon of color spot formation. The main reason is the biochemical degradation caused by the presence of undried rubber in the rubber package. This phenomenon may be accompanied by mold, overheated spots or the smell of foul decomposition. 70
B.1 Standard samples of physical smoked rubber sheets include:
GB8089-87
Appendix B
Standard samples of physical smoked rubber sheets
(Supplement)
First-class smoked rubber sheets (No.1 RSS) physical standard sample, second-level smoked rubber sheet (No.2 RSS) physical standard sample: third-level smoked rubber sheet (No.3 RSS) physical standard sample; fourth-level smoked rubber sheet (No. 4 RSS) physical standard sample; fifth-level smoked rubber sheet (No. 5 RSS) physical standard sample. B. 2 Use \Copy International Samples\ as the parent of the physical standard samples of this standard. Additional notes:
This standard is under the jurisdiction of the Agricultural Research Bureau of the Ministry of Agriculture, Animal Husbandry and Fisheries. This standard was drafted by the South China Tropical Crops Product Processing and Design Institute. The main drafter of this standard is Deng Pingyang.
This standard is equivalent to the "International Standard for Natural Rubber Grade Quality and Packaging (Green Book)" (1979). Standard Search Mai Network Research4 Rubber bags must be transported in clean carriages and covered with tarpaulins to prevent sunlight or rain from causing the rubber to mold and deteriorate. 67
Skimmings
GB 8089--87
Appendix A
Terms
(Supplement)
Film made by withdrawing foam from the liquid surface when latex is coagulated with acid. A. 2 Weak rubber
Also known as brittle rubber. Rubber that is easily torn or broken when the film is stretched sharply. A,3 Burnt sheets
Film that has been burnt, oxidized and turned black due to being too close to fireworks during smoking. A.4 Virgin rubber
Rubber that still retains a lot of original moisture and has a grayish-white surface. A.5 Bleached rubber
Rubber that has become damp and absorbed too much water. A.6 Skim latex
When latex is concentrated by a centrifuge, a concentrated latex with a dry rubber content of about 60% is obtained. The other part of the liquid containing about 5% dry rubber is called skim latex. A.7 Oxidized rubber
Rubber that has been damaged or degraded due to the combination of rubber hydrocarbons and whey substances in the rubber with oxygen. A. 8 Heated rubber
Rubber with spots or streaks that become soft and sticky. A.9 Ungef-cured rubber Rubber that has not been completely dried during the fumigation or drying process. A. 10 Over-smoked rubber Rubber that has become almost opaque during the smokeless process due to excessive smoke. This specification does not include rubber that has been slightly burnt due to being too close to fireworks during fumigation.
A. 11 Opaque sheets Film that is opaque (Grade 4 and 5 smoked sheets are generally in this state). A.12 Dry rubber
Rubber that shows no signs of moisture based on appearance (see regenerated rubber, sandwiched rubber and smoked non-transparent rubber). 68www.bzxz.net
A.13 Clean
GB 8089-87
Based on the appearance grading and identification, compared with the physical standard samples of Grade 1 and Grade 2 smoked sheets, the amount of impurities does not exceed the level shown in the sample. A. 14 Strong rubber Rubber that has the properties of resistance to deformation and stretching A.15 Firm rubber
Based on the appearance, it is very different from the state of weak rubber and is a uniform, strong and firm rubber. A.16 Blemishes
Except for roller damage during sheeting, films with any defects, spots or damage are not allowed during grading. A. 17 Resinous matter (Rust) The surface of smoked rubber is covered with a layer of brown rust-like substance formed by bacteria decomposing non-rubber components in rubber. A.18 Blisters
During the rubber making process, gas is generated due to the decomposition of rubber, which forms bubbles on the surface and inside of the film with sticky inner surfaces. A.19 Sand
The rubber contains more or less loose small particles of quartz components. A.20 Bark specks or patticles The rubber contains bark specks or patticles and other foreign organic matter specks or patticles. A.21 Bubbles
During the rubber making process, due to the mixing of air into the latex or slight fermentation, small round bubbles with non-sticky inner surface are formed inside the rubber sheet. A.22 Dirty packing
Rubber bales with foreign debris such as grass, straw, rattan silk, paper, rags, sawdust or other foreign substances mixed in the rubber bales. A. 23 Foreign matter In natural rubber, any substance other than rubber hydrocarbons and natural substances inherent in latex is called foreign matter. A.24 Sound rubber Rubber without any defects and weaknesses after appearance grading. A. 25 Frothy sheets Rubber sheets that are over-fermented during the coagulation process, causing the entire sheet of film to be covered with bubbles and sticky bubbles, making it soft and deteriorated. A. 26 Mottled rubber Rubber) Rubber with darker spots, stains or streaks and spots formed by fungi. 69
A.27 Sticky rubber (Sticky rubber) Rubber with sticky, viscous or sticky. A.28 Sour and foul odors Odors caused by rubber corruption.
A.29 Discoloration (Discoloration)
GB8089-87
Refers to the phenomenon of color spot formation. The main reason is the biochemical degradation caused by the presence of undried rubber in the rubber package. This phenomenon may be accompanied by mold, overheated spots or the smell of foul decomposition. 70
B.1 Standard samples of physical smoked rubber sheets include:
GB8089-87
Appendix B
Standard samples of physical smoked rubber sheets
(Supplement)
First-class smoked rubber sheets (No.1 RSS) physical standard sample, second-level smoked rubber sheet (No.2 RSS) physical standard sample: third-level smoked rubber sheet (No.3 RSS) physical standard sample; fourth-level smoked rubber sheet (No. 4 RSS) physical standard sample; fifth-level smoked rubber sheet (No. 5 RSS) physical standard sample. B. 2 Use \Copy International Samples\ as the parent of the physical standard samples of this standard. Additional notes:
This standard is under the jurisdiction of the Agricultural Research Bureau of the Ministry of Agriculture, Animal Husbandry and Fisheries. This standard was drafted by the South China Tropical Crops Product Processing and Design Institute. The main drafter of this standard is Deng Pingyang.
This standard is equivalent to the "International Standard for Natural Rubber Grade Quality and Packaging (Green Book)" (1979). Standard Search Mai Network Research4 Rubber bags must be transported in clean carriages and covered with tarpaulins to prevent sunlight or rain from causing the rubber to mold and deteriorate. 67
Skimmings
GB 8089--87
Appendix A
Terms
(Supplement)
Film made by withdrawing foam from the liquid surface when latex is coagulated with acid. A. 2 Weak rubber
Also known as brittle rubber. Rubber that is easily torn or broken when the film is stretched sharply. A,3 Burnt sheets
Film that has been burnt, oxidized and turned black due to being too close to fireworks during smoking. A.4 Virgin rubber
Rubber that still retains a lot of original moisture and has a grayish-white surface. A.5 Bleached rubber
Rubber that has become damp and absorbed too much water. A.6 Skim latex
When latex is concentrated by a centrifuge, a concentrated latex with a dry rubber content of about 60% is obtained. The other part of the liquid containing about 5% dry rubber is called skim latex. A.7 Oxidized rubber
Rubber that has been damaged or degraded due to the combination of rubber hydrocarbons and whey substances in the rubber with oxygen. A. 8 Heated rubber
Rubber with spots or streaks that become soft and sticky. A.9 Ungef-cured rubber Rubber that has not been completely dried during the fumigation or drying process. A. 10 Over-smoked rubber Rubber that has become almost opaque during the smokeless process due to excessive smoke. This specification does not include rubber that has been slightly burnt due to being too close to fireworks during fumigation.
A. 11 Opaque sheets Film that is opaque (Grade 4 and 5 smoked sheets are generally in this state). A.12 Dry rubber
Rubber that shows no signs of moisture based on appearance (see regenerated rubber, sandwiched rubber and smoked non-transparent rubber). 68
A.13 Clean
GB 8089-87
Based on the appearance grading and identification, compared with the physical standard samples of Grade 1 and Grade 2 smoked sheets, the amount of impurities does not exceed the level shown in the sample. A. 14 Strong rubber Rubber that has the properties of resistance to deformation and stretching A.15 Firm rubber
Based on the appearance, it is very different from the state of weak rubber and is a uniform, strong and firm rubber. A.16 Blemishes
Except for roller damage during sheeting, films with any defects, spots or damage are not allowed during grading. A. 17 Resinous matter (Rust) The surface of smoked rubber is covered with a layer of brown rust-like substance formed by bacteria decomposing non-rubber components in rubber. A.18 Blisters
During the rubber making process, gas is generated due to the decomposition of rubber, which forms bubbles on the surface and inside of the film with sticky inner surfaces. A.19 Sand
The rubber contains more or less loose small particles of quartz components. A.20 Bark specks or patticles The rubber contains bark specks or patticles and other foreign organic matter specks or patticles. A.21 Bubbles
During the rubber making process, due to the mixing of air into the latex or slight fermentation, small round bubbles with non-sticky inner surface are formed inside the rubber sheet. A.22 Dirty packing
Rubber bales with foreign debris such as grass, straw, rattan silk, paper, rags, sawdust or other foreign substances mixed in the rubber bales. A. 23 Foreign matter In natural rubber, any substance other than rubber hydrocarbons and natural substances inherent in latex is called foreign matter. A.24 Sound rubber Rubber without any defects and weaknesses after appearance grading. A. 25 Frothy sheets Rubber sheets that are over-fermented during the coagulation process, causing the entire sheet of film to be covered with bubbles and sticky bubbles, making it soft and deteriorated. A. 26 Mottled rubber Rubber) Rubber with darker spots, stains or streaks and spots formed by fungi. 69
A.27 Sticky rubber (Sticky rubber) Rubber with sticky, viscous or sticky. A.28 Sour and foul odors Odors caused by rubber corruption.
A.29 Discoloration (Discoloration)
GB8089-87
Refers to the phenomenon of color spot formation. The main reason is the biochemical degradation caused by the presence of undried rubber in the rubber package. This phenomenon may be accompanied by mold, overheated spots or the smell of foul decomposition. 70
B.1 Standard samples of physical smoked rubber sheets include:
GB8089-87
Appendix B
Standard samples of physical smoked rubber sheets
(Supplement)
First-class smoked rubber sheets (No.1 RSS) physical standard sample, second-level smoked rubber sheet (No.2 RSS) physical standard sample: third-level smoked rubber sheet (No.3 RSS) physical standard sample; fourth-level smoked rubber sheet (No. 4 RSS) physical standard sample; fifth-level smoked rubber sheet (No. 5 RSS) physical standard sample. B. 2 Use \Copy International Samples\ as the parent of the physical standard samples of this standard. Additional notes:
This standard is under the jurisdiction of the Agricultural Research Bureau of the Ministry of Agriculture, Animal Husbandry and Fisheries. This standard was drafted by the South China Tropical Crops Product Processing and Design Institute. The main drafter of this standard is Deng Pingyang.
This standard is equivalent to the "International Standard for Natural Rubber Grade Quality and Packaging (Green Book)" (1979). Standard Search Mai Network Research15 Firm rubber
According to the appearance, it is very different from the weak rubber state. It is a uniform, strong and solid rubber. A.16 Blemishes
Except for roller damage during sheeting, no defects, spots or damage are allowed during grading. A. 17 Resinous matter (Rust) (Resinous matter "rust\) The surface of smoked rubber is covered with a layer of brown rust-like substance formed by bacteria decomposing non-rubber components in rubber. A.18 Blisters
During the rubber making process, due to the decomposition of rubber, gas is generated, which forms bubbles on the surface and inside of the rubber with sticky inner surface. A.19 Sand
The loose small particles of quartz components contained in the rubber are more or less. A.20 Bark specks or patticles (Bark specks or patticles) There are bark specks or particles of other foreign organic matter in the rubber. A.21 Bubbles
During the rubber making process, due to the mixing of air into the latex or slight fermentation, small round bubbles with non-sticky inner surface are formed inside the rubber sheet. A.22 Dirty packing
Rubber bales with foreign debris such as grass, straw, rattan silk, paper, rags, sawdust or other foreign substances mixed in the rubber bales. A. 23 Foreign matter In natural rubber, any substance other than rubber hydrocarbons and natural substances inherent in latex is called foreign matter. A.24 Sound rubber Rubber without any defects and weaknesses after appearance grading. A. 25 Frothy sheets Rubber sheets that are over-fermented during the coagulation process, causing the entire sheet of film to be covered with bubbles and sticky bubbles, making it soft and deteriorated. A. 26 Mottled rubber Rubber) Rubber with darker spots, stains or streaks and spots formed by fungi. 69
A.27 Sticky rubber (Sticky rubber) Rubber with sticky, viscous or sticky. A.28 Sour and foul odors Odors caused by rubber corruption.
A.29 Discoloration (Discoloration)
GB8089-87
Refers to the phenomenon of color spot formation. The main reason is the biochemical degradation caused by the presence of undried rubber in the rubber package. This phenomenon may be accompanied by mold, overheated spots or the smell of foul decomposition. 70
B.1 Standard samples of physical smoked rubber sheets include:
GB8089-87
Appendix B
Standard samples of physical smoked rubber sheets
(Supplement)
First-class smoked rubber sheets (No.1 RSS) physical standard sample, second-level smoked rubber sheet (No.2 RSS) physical standard sample: third-level smoked rubber sheet (No.3 RSS) physical standard sample; fourth-level smoked rubber sheet (No. 4 RSS) physical standard sample; fifth-level smoked rubber sheet (No. 5 RSS) physical standard sample. B. 2 Use \Copy International Samples\ as the parent of the physical standard samples of this standard. Additional notes:
This standard is under the jurisdiction of the Agricultural Research Bureau of the Ministry of Agriculture, Animal Husbandry and Fisheries. This standard was drafted by the South China Tropical Crops Product Processing and Design Institute. The main drafter of this standard is Deng Pingyang.
This standard is equivalent to the "International Standard for Natural Rubber Grade Quality and Packaging (Green Book)" (1979). Standard Search Mai Network Research15 Firm rubber
According to the appearance, it is very different from the weak rubber state. It is a uniform, strong and solid rubber. A.16 Blemishes
Except for roller damage during sheeting, no defects, spots or damage are allowed during grading. A. 17 Resinous matter (Rust) (Resinous matter "rust\) The surface of smoked rubber is covered with a layer of brown rust-like substance formed by bacteria decomposing non-rubber components in rubber. A.18 Blisters
During the rubber making process, due to the decomposition of rubber, gas is generated, which forms bubbles on the surface and inside of the rubber with sticky inner surface. A.19 Sand
The loose small particles of quartz components contained in the rubber are more or less. A.20 Bark specks or patticles (Bark specks or patticles) There are bark specks or particles of other foreign organic matter in the rubber. A.21 Bubbles
During the rubber making process, due to the mixing of air into the latex or slight fermentation, small round bubbles with non-sticky inner surface are formed inside the rubber sheet. A.22 Dirty packing
Rubber bales with foreign debris such as grass, straw, rattan silk, paper, rags, sawdust or other foreign substances mixed in the rubber bales. A. 23 Foreign matter In natural rubber, any substance other than rubber hydrocarbons and natural substances inherent in latex is called foreign matter. A.24 Sound rubber Rubber without any defects and weaknesses after appearance grading. A. 25 Frothy sheets Rubber sheets that are over-fermented during the coagulation process, causing the entire sheet of film to be covered with bubbles and sticky bubbles, making it soft and deteriorated. A. 26 Mottled rubber Rubber) Rubber with darker spots, stains or streaks and spots formed by fungi. 69
A.27 Sticky rubber (Sticky rubber) Rubber with sticky, viscous or sticky. A.28 Sour and foul odors Odors caused by rubber corruption.
A.29 Discoloration (Discoloration)
GB8089-87
Refers to the phenomenon of color spot formation. The main reason is the biochemical degradation caused by the presence of undried rubber in the rubber package. This phenomenon may be accompanied by mold, overheated spots or the smell of foul decomposition. 70
B.1 Standard samples of physical smoked rubber sheets include:
GB8089-87
Appendix B
Standard samples of physical smoked rubber sheets
(Supplement)
First-class smoked rubber sheets (No.1 RSS) physical standard sample, second-level smoked rubber sheet (No.2 RSS) physical standard sample: third-level smoked rubber sheet (No.3 RSS) physical standard sample; fourth-level smoked rubber sheet (No. 4 RSS) physical standard sample; fifth-level smoked rubber sheet (No. 5 RSS) physical standard sample. B. 2 Use \Copy International Samples\ as the parent of the physical standard samples of this standard. Additional notes:
This standard is under the jurisdiction of the Agricultural Research Bureau of the Ministry of Agriculture, Animal Husbandry and Fisheries. This standard was drafted by the South China Tropical Crops Product Processing and Design Institute. The main drafter of this standard is Deng Pingyang.
This standard is equivalent to the "International Standard for Natural Rubber Grade Quality and Packaging (Green Book)" (1979). Standard Search Mai Network Research
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