When trying to look for the best silicone rubber, you have to think about the specific kind that is needed. This will have a huge impact on the choice of the specialist silicone injection molding company. Basically speaking, two of the choices that you have to keep in mind would be liquid silicone rubber and high consistency silicone rubber. In the rest of this article, you will know some of the differences between the two, which will also help you to make a well-informed decision when it comes to what can prove to be the better option.
One of the major differences between the two would be with regards to their typical tensile strength. Simply speaking, tensile strength simply refers to the ability of a material to resist tension as it is broken down. This will be indicative of how strong the material is regardless of the pressure that is applied to it. In the case of liquid silicone rubber, the tensile strength is anywhere from 3.6 to 11 MPa. On the other hand, for high consistency silicone rubber, the tensile strength is anywhere from 4 to 12.5 MPa.
In terms of the elongation range, there is also very little difference between the two. High consistency rubber can be elongated from 90 to 1120%. On the other hand, liquid silicone rubber can be elongated from 220 to 900%. To add, when it comes to tear strength, high consistency rubber has a rating of 9 to 55 kN/m. liquid silicone rubber has a tear strength of 11 to 52 kN/m. Again, both of the figures note very little discrepancy between the two materials.
When it comes to their processing, there are also significant differences that can be noted. Generally, the processing of high consistency silicone rubber will be more complicated because there are five steps that are involved, which include: mill softening and catalyzation, preparation of preform, molding, vulcanization, and finishing. Liquid silicone rubber, on the other hand, will prove to be less labor intensive as it only involves three procedures: meter-mixing, molding, and finishing. It is beneficial because of the fact that it can be applied even in automated and closed systems, which also means that less human effort will be required.
At the end of the day, the most important thing to keep in mind is that there are actually very little differences between high consistency silicone rubber and liquid consistency silicone rubber. It will be a matter of personal preference and the equipment that are available. Nonetheless, the small differences should matter if they are going to be processed for the fabrication of medical devices. If one choice between the two will be made, especially for those who are new in the industry, liquid silicone rubber is believed to be the better option. This is basically because of the fact that it has lower capital costs and will require less in terms of labor.