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Seven important factors affecting silicone products


First, the viscosity.

Technical terminology: The volumetric property of a liquid, pseudo-liquid or pseudo-solid material against flow, that is, the internal friction or internal flow resistance exhibited by molecules when flowing by an external force. Usually the viscosity is proportional to the hardness.

Second, the hardness.

The ability of a material to partially resist the intrusion of a hard object into its surface is called hardness. Silicone rubber has a Shore hardness range of 10 to 80, which gives the designer the freedom to choose the hardness required to best achieve a particular function. Various intermediate hardness values ​​can be achieved by mixing the polymer substrates, fillers, and auxiliaries in different ratios. Similarly, the time and temperature of heat curing can also change the hardness without damaging other physical characteristics.

Third, the tensile strength.

Tensile strength is the force required to cause each range of units when a piece of rubber material is torn. The hot-sweet type solid silicone rubber has a tensile strength ranging from 4. 0 to 1.2 MPa. The tensile strength of the fluorosilicone rubber ranges from 8.7 to 1.1 MPa. The tensile strength of the liquid silicone rubber ranges from 3. 6 to 1.1 MPa.

Fourth, the tear strength.

Resistance to enlargement of the incision or score when force is applied to the sample with the incision. The hot-sulphurized solid silicone rubber can be not torn even after being cut and placed under extremely high torsional stress. The hot vulcanized solid silicone rubber has a tear strength ranging from 9 to 55 kN/m. The fluorosilicone tear strength ranges from 17.5 to 46. 4 kN/m. The liquid silicone rubber tear strength ranges from 11.5 to 52 kN/m.

Fifth, the elongation rate.

Generally refers to the "limit rupture elongation" or the percentage increase relative to the original length when the sample breaks. The hot vulcanized solid silicone rubber generally has an elongation ranging from 90 to 1120%. Fluorosilicone rubber generally has an elongation of between 159 and 699%. Liquid silicone rubber generally has an elongation of between 220 and 900%. Different processing methods and choice of hardener can greatly change the elongation. The elongation of silicone rubber has a lot to do with temperature.

Six, operating time.

The operating time is calculated from the moment the colloid is added to the vulcanizing agent. There is no complete limit between this operation time and the subsequent vulcanization time. The colloid has been vulcanized since the moment the vulcanizing agent was added. This operation time means that the product's 30-minute vulcanization reaction can not affect the quality of the finished product. Therefore, the more time saved during the operation of the product, the more favorable it is to the finished product.

Seven, curing time.

Some places will say that it is curing time. That is to say, after such a long period of time, the vulcanization reaction of the silica gel is basically finished. This basically ends, that is to say the product is already available, but in fact there is still a small part of the curing reaction is not over yet. Therefore, products made of silicone rubber, such as silicone molds, are usually put on for a while before being put into use.

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