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Silicone Properties
Mar 27, 2018

1.Viscosity

Technical noun Explanation: liquid, quasi-liquid or quasi-solid material resistance to the flow of the volume characteristics, that is, the flow of external forces, the intermolecular internal friction or flow of resistance. Usually the viscosity is proportional to the hardness.

2.hardness

The ability of a material to resist hard objects pressing into its surface is called hardness. Silicone rubber has 10 to 80 of the shore hardness range, which gives designers full freedom to choose the required hardness to best achieve specific features. Different proportions of polymer substrates, fillers and auxiliaries can be used to achieve various intermediate hardness values. Similarly, the time and temperature at which the heat is cured can also change the hardness without destroying other physical characteristics.

3.tensile strength

Tensile strength refers to the force required on each range unit when a specimen of a rubber material is torn. Hot sulfur-type solid-state silicone rubber tensile strength range between 4.0-12.5mpa. The tensile strength range of fluorine silicone rubber is between 8.7-12.1mpa. The tensile strength range of liquid silicone rubber is between 3.6-11.0mpa.

4.Tearing strength

An obstruction of an enlarged resistance of an incision or notch when exerting force on a sample with an incision. Hot sulfur-type solid-state silicone rubber can not be torn apart even after being cut into extremely high torsional stress. The tearing strength of hot sulfur-type solid-state silicone rubber is between 9-55 kn/m. The tear strength range of fluorine silicone rubber is between 17.5-46.4 kn/m. The tear strength range of liquid silicone rubber is between 11.5-52 kn/m.

5.Elongation rate

Usually refers to the "ultimate rupture elongation" or the percentage increase in the sample when the specimen is fractured relative to the original length. Thermal sulfur-type solid-state silicone rubber in general elongation range between 90到1120%. The general elongation rate of fluorine silicone rubber is between 159到699%. The general elongation rate of liquid silicone rubber is between 220到900%. Different processing methods and the choice of Hardener can greatly change the elongation. The elongation of silicone rubber has a great relationship with temperature.

6.operating time

The operating time is calculated from the moment the colloid is added to the vulcanizing agent. This operation time and the back of that vulcanization time actually does not have the complete boundary, the colloid from adds the vulcanizing agent the moment to begin has already carried on the vulcanization reaction, this operation time is said that the product 30 minute vulcanization reaction may not affect the finished product the quality. So the more time-saving the product is in the process, the better.

7.vulcanization Time

Some places will say curing time. That is to say, after such a long time the vulcanization reaction of silica gel is basically over. This is basically the end of the product is already available, but in fact there is still a small part of the curing reaction is not over. Therefore, the use of silicone rubber products, such as silicone mold usually put for a period of time before putting into use.


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