Shin-Etsu Chemical has now developed a molding silicone rubber that also does not require post cure in its millable form.
Shin-Etsu is the first in the industry to have developed a millable (high consistency) type of silicone rubber that does not require a post cure. Shin-Etsu succeeded in developing this breakthrough product by making use of the unique technology that Shin-Etsu Chemical has cultivated over a long period of years.
Reduced Amount of Low-molecular Siloxane Content
In the existing molding method for millable-type silicone rubber, after the initial press cure of the silicone molding is performed, a post cure is carried out in order to drive off the residues that are left within the molded product as a result of the vulcanization agent used in rubber molding as well as the low-molecular siloxane.
Compared to the existing product, the new silicone rubber molding product that Shin-Etsu has developed greatly reduces the amount of low-molecular siloxane content, and by employing an addition-reaction cure system that does not create by-products at the time of a press cure, the process of post cure becomes unnecessary. Because of this, our new product will contribute to molding-makers’ productivity improvements and energy saving, and at the same time, we are expecting that this new product will respond to such customer requests as preventing the adhesion of foreign substances to the molded products.
Suitable for Various Molding Methods
Furthermore, this new product is suitable for various molding methods such as extrusion molding, transfer molding, calender molding, press molding and
injection molding.
With regard to its liquid-type silicone rubber, already ahead of others in the industry, Shin-Etsu Chemical is marketing its LIMS (Liquid Injection Molding System) materials that do not require post cure, and LIMS is being widely used in various fields, mainly for applications in automobile parts.
Molding Technical Laboratory has a millable injection-molding machine installed, and Shin-Etsu Chemical will be carrying out demonstrations there of molding using this new product. Going forward, at this Laboratory the company will strive to meet the current and future requests that are received from the customers by enhancing the technical services to offer.
Source: Shin-Etsu Chemical