What are the main factors affecting silicone kitchen utensils?baby pacifier bibs Processor

　　As a kind of household cooking utensils, the safety of silicone kitchen utensils is very important. When purchasing, we must find a regular manufacturer to buy, and we need to have the food-grade environmental certification test report of the product, or the FDA, LFGB certification test report. When purchasing, we should also pay attention to choosing kitchen utensils suitable for our own use. We must correctly distinguish the use of individual kitchen utensils. Before purchasing, we must know whether the quality of silicone products is qualified material. You can smell it with your nose. Smell the smell of the product, the strict silicone kitchen utensils should not have any smell when it is hot or cold, stretch it back and forth several times to see if it can rebound, and in addition to these methods, the production process can also be obtained from the silicone product manufacturer. The performance of raw materials to understand!

　　1. Viscosity.

　　Explanation of technical terms: the volume characteristic of liquid, quasi-liquid or quasi-solid material against flow, that is, the internal friction or internal resistance of flow between molecules when flowing under the action of external force. Usually viscosity and hardness are proportional.

　　Second, hardness.

　　The ability of a material to locally resist the pressing of a hard object into its surface is called hardness. Silicone rubber has a Shore hardness range of 10 to 80, which gives designers full freedom to choose the hardness required to best perform a specific function. Various intermediate hardness values can be achieved by mixing different proportions of polymer substrates, fillers and auxiliaries. Likewise, the time and temperature of heat curing can also change hardness without destroying other physical characteristics.

　　3. Tensile strength.

　　Tensile strength refers to the force required per range unit to cause a piece of rubber material to tear. The tensile strength of thermally vulcanized solid silicone rubber ranges from 4.0 to 12.5 MPa. The tensile strength of fluorosilicone rubber ranges from 8.7-12.1MPa. The tensile strength of liquid silicone rubber ranges from 3.6 to 11.0 MPa.

　　4. Tear strength.

　　Resistance to the enlargement of a cut or score when force is applied to a cut sample. Even if it is cut and placed under extremely high torsional stress, the thermally vulcanized solid silicone rubber can not be torn. The tear strength of thermally vulcanized solid silicone rubber ranges from 9 to 55 kN/m. The tear strength of fluorosilicone rubber ranges from 17.5-46.4 kN/m. Liquid silicone rubber has a tear strength range of 11.5-52 kN/m.

　　5. Elongation.

　　Usually referred to as the "Ultimate Elongation at Break" or the percentage increase relative to the original length when the sample breaks. Thermally vulcanized solid silicone rubber typically has an elongation range of 90 to 1120%. The general elongation of fluorosilicone rubber is between 159 and 699%. The general elongation of liquid silicone rubber is between 220 and 900%. Different processing methods and the choice of hardener can greatly change its elongation. The elongation of silicone rubber has a lot to do with temperature.

　　6. Operation time.

　　The operating time is calculated from the moment the colloid is added to the vulcanizing agent. In fact, there is no complete boundary between this operation time and the latter vulcanization time. The colloid has already undergone the vulcanization reaction from the moment the vulcanizing agent is added. This operation time means that the 30-minute vulcanization reaction of the product can not affect the quality of the finished product. Therefore, the more time saved in the product operation process, the more beneficial to the finished product. Some places will say it is curing time. That is to say, after such a long time, the vulcanization reaction of silica gel is basically over. This basically means that the product is ready to use, but in fact there is still a small part of the curing reaction that has not ended. Therefore, products made of silicone rubber, such as silicone molds, are usually put into use for a period of time.

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