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4Common problem

Composition instructions for silicone products


Three reasons that affect the unsatisfactory hygiene and safety testing of exported silicone products:
The health and safety of exported silicone products are highly regarded by European and American countries. This year has seen many unsatisfactory pre-examinations and sampling inspections of exported silicone products. The unsatisfactory sanitary indicators for export of silica gel products require us to perform the following three reasons and improve the quality control of raw materials. Some factories pay little attention to the raw materials used for kitchen utensils. They do not use raw materials of low quality silica gel for the production of food tools, or use unqualified colorants and additives in the production process. Due to the coloring, the product was unqualified.
The production process is not standardized:
Due to the particularity of the safety requirements for silicone tableware, food silicone products have very strict requirements on the production process. After the products are molded, they need enough time to remove the volatile substances. In order to pursue efficiency, some factories did not achieve sufficient processing time. Countries such as the European Union require product testing to be conducted in the most stringent use of its foreseeable manner. Most factories only produce samples based on customer samples. They do not understand the use of products and the conditions of use. They are also blind when dealing with third-party inspections, and are even inconsistent with the foreseeable conditions of use.
Secondary vulcanization of silicone products:
Secondary vulcanization is also called post-vulcanization. The role of secondary vulcanization: When silicone rubber is peroxide-cured, the decomposition of peroxides initiates the polymer reaction, resulting in the formation of low-molecular compounds (such as benzene and benzoic acid) present in the rubber that will affect the mechanical properties of the rubber. Moreover, after the silicone rubber is heated and molded in the first stage, its cross-linking density is not enough, and it is necessary to make the further vulcanization reaction to increase the density of the silicone rubber. Tensile strength, resilience, hardness, swelling degree, density and thermal stability are all better than those of primary vulcanization. If you do not perform secondary vulcanization, the performance of the silica gel may be affected to a certain extent, and a product with better performance may not be obtained. The parameters of primary vulcanization and secondary vulcanization may be different. This is related to the actual operation! There are many types of silicone vulcanization, high temperature and room temperature. According to the high-temperature silicone, for example, before the vulcanization, it is what we usually call raw rubber. The compound rubber is made by mixing many additives such as vulcanizing agent, mold release agent and raw rubber. It can be seen from the appearance. When you break it with your hand, there is no flexibility. If at a certain temperature, the kneaded rubber is vulcanized and molded at a certain temperature, products can be obtained, just like the silicone mobile phone cases we commonly find, and as long as the drug is not poisoned, the manufacturer can provide food certification. It is non-toxic.

Dongguan Guangmei Silicon Rubber Products Co., Ltd.Variety | Stock foot | Customized drawingsFocus on the processing and sales of silicone rubber products

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