1、 Viscosity:

Explanation of technical terms: the volume characteristics of liquid, quasi liquid or quasi solid substances against flow, that is, the internal friction or internal flow resistance between molecules when flowing under the action of external force. Viscosity is usually proportional to hardness.

2、 Hardness:

The ability of a material to locally resist hard objects pressing 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 required hardness to best achieve specific functions. Various intermediate hardness values can be achieved by mixing polymer substrates, fillers and additives in different proportions. Similarly, the time and temperature of heat curing can also change the hardness without damaging other physical characteristics.

3、 Tensile strength:

Tensile strength refers to the force required in each range unit to cause a sample of rubber material to tear. The tensile strength of hot vulcanized solid silicone rubber ranges from 4.0 to 12.5mpa. The tensile strength of fluorosilicone rubber ranges from 8.7 to 12.1mpa. The tensile strength of liquid silicone rubber ranges from 3.6 to 11.0mpa.

4、 Tear strength:

Resistance to the expansion of the notch or notch when a force is applied to a notched sample. Even under extremely high torsional stress after cutting, the hot vulcanized solid silicone rubber can not be torn. The tear strength of hot vulcanized solid silicone rubber ranges from 9 to 55 kn / m. The tear strength of fluorosilicone rubber ranges from 17.5 to 46.4 kn / m. The tear strength of liquid silicone rubber ranges from 11.5 to 52 kn / m.

5、 Elongation:

It usually refers to the "ultimate breaking elongation" or the percentage increase relative to the original length when the sample breaks. Hot vulcanized solid silicone rubber generally has an elongation range of 90 to 1120%. The general elongation of fluorosilicone rubber is between 159 and 699%. The elongation of liquid silicone rubber is generally between 220 and 900%. Different processing methods and the choice of hardener can greatly change its elongation. The elongation of silicone rubber is closely related to temperature.

6、 Operation time:

The operation time is calculated from the moment when the colloid is added with vulcanizing agent. In fact, there is no complete limit between this operation time and the later vulcanization time. The vulcanization reaction of the colloid has been carried out since the moment when 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 is saved in the process of product operation, the more beneficial it is to the finished product.

7、 Curing time:

Some places will say it is curing time. In other words, after such a long time, the vulcanization reaction of silica gel is basically over. This is basically over, that is, the product is available, but in fact, there is still a small part of the curing reaction is not over. Therefore, products made of silicone rubber, such as silicone molds, usually have to be put into use for a period of time.