This standard specifies the specifications of general-purpose vulcanized latex. This standard applies to vulcanized latex made from high-ammonia concentrated natural latex from Hevea brasiliensis, but does not apply to compound latex, synthetic latex and other special latex. GB/T 14797.1-1993 Concentrated natural latex vulcanized latex GB/T14797.1-1993 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Concentrated natural rubber latex vulcanized latex
Natural rubber latex concentratePrevulcanized rubber latex
Subject content and scope of application
This standard specifies the specifications of general-purpose vulcanized latex. GB/T 14797. 1-93
This standard applies to vulcanized latex made from high-ammonia concentrated natural latex of Hevea brasiliensis, but does not apply to compound latex, synthetic latex and other special latex.
Cited standards
GB8289
Natural concentrated latex
GB 8290
Natural concentrated latex
GB8298
Natural concentrated latex
GB8300
Natural concentrated latex
GB 8301
Natural concentrated latex
Specifications for centrifuged latex preserved with ammonia
Determination of total solid content
Determination of alkalinity
Determination of mechanical stability
GB/T14797.2 Concentrated natural latex
Determination of viscosity of vulcanized latex
GB/T 14797.3
Concentrated natural latex
Determination of swelling degree of vulcanized latex
3 Technical requirements
3.1 Except for the essential vulcanizing agent and vulcanizing auxiliaries, no filler should be added to the vulcanized latex. 3.2 The vulcanized latex should all meet the quality requirements listed in Table 1. Table 1 Specifications of vulcanized latex
Total solid content, %, minimum valuebzxz.net
Alkalinity, % (calculated as latex ammonia) minimum value
Viscosity, mPa·s (27℃) maximum value
Mechanical stability, s, minimum value
Swelling degree, %
4 Inspection method
4.1 Sampling of vulcanized latex shall be carried out according to the method specified in GB8290. 4.2 Total solid content shall be carried out according to the method specified in GB8298. 4.3 Alkalinity, according to the method specified in GB8300. 4.4 Viscosity, according to the method specified in GB/T14797.2. State Technical Supervision Bureau approved the standard on December 25, 1993 and implemented it on August 1, 1994. GB/T 14797.1-93. 4.5 Mechanical stability, according to the method specified in GB8301. 4.6 Swelling degree, according to the method specified in GB/T14797.3. 5 Inspection rules 5.1 Product inspection must be carried out according to the inspection methods specified in this standard. 5.2 The manufacturer takes samples of each batch of latex as a batch of products for inspection. Before packaging the product, mix the latex evenly and take samples immediately. The stirring time shall be determined through experiments, and the difference in the total solid content of the latex taken from the upper and lower layers of the tank shall be within 0.5%.
5.3 Take samples from the barrel and randomly select 10% of the total number of pieces as representative sample barrels. The latex in the sample barrel should be stirred evenly and then sampled immediately. 6 Marking, packaging, transportation, storage
6.1 Marking The packaging barrel should be marked with: vulcanized natural latex, type (such as general type, etc.), manufacturer name or code, batch number, barrel number, gross weight, tare weight, net weight, production date.
6.2 Packaging is generally packed in iron barrels. The packaging container should be thoroughly cleaned and the inner wall should be evenly coated with a layer of alkali-resistant paint that is harmless to latex. When packaging, the latex should be carefully loaded into the container, and no oil, iron filings or other debris should be brought in, and care should be taken to prevent the latex from overflowing from the container. Spilled latex shall not be packaged as genuine products.
6.3 When transporting and moving latex barrels, they should be placed gently and rolled slowly, and no collisions should be allowed to prevent damage. They should be covered during transportation and transport, and should not be exposed to the sun. The temperature should be kept within the range of 2 to 35°C. 6.4 The storage temperature should be maintained at 2 to 35°C, pay attention to sun protection, and should be checked frequently. If any leakage is found, it should be packaged separately. Additional instructions:
This standard was proposed by the Ministry of Agriculture of the People's Republic of China. This standard is under the jurisdiction of the Natural Rubber Standardization Subcommittee of the National Technical Committee for Standardization of Rubber and Rubber Products. This standard was drafted by the South China Tropical Crops Product Processing and Design Institute. The main drafters of this standard are Wang Musheng and Zhou Hongqing. 140)
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