In rubber vulcanization or plastic injection molding processes, molten or uncured materials tend to adhere to hot metal mold surfaces, leading to difficult demolding, product tearing, or mold damage. Silicone oil-based release agents achieve physical separation between the material and the mold by constructing a low-surface-energy, thermally stable isolation film on the mold surface; their mechanism of action is based on interfacial energy regulation rather than chemical reactions.

The backbone of silicone oil molecules is flexible, and the side groups are non-polar methyl groups, giving them extremely low surface tension (approx. 20 mN/m). When sprayed or wiped onto a mold surface, the silicone oil spontaneously spreads into a continuous film. During material injection, this film blocks the van der Waals attraction or potential chemical adsorption between polymer chain segments and metal atoms, significantly reducing the work of adhesion at the interface. Even under high temperatures (>150°C) and high pressure, the high bond energy of the silicon-oxygen bond (Si–O) ensures the film does not decompose or carbonize.

Compared to wax-based or fatty acid-based release agents, the silicone oil film is thinner and more uniform, and it does not migrate into the product, avoiding impacts on subsequent printing, bonding, or electrical properties. Its chemical inertness also prevents side reactions with sulfur-containing rubbers or engineering plastics. Emulsion-type silicone oil release agents use water as a carrier, are environmentally friendly, and are easy to clean, making them suitable for automated production lines.

It should be noted that the release effect depends on the integrity and uniformity of the film. Excessive use may cause oil spots on the product surface; insufficient use leads to local sticking. Therefore, the value of silicone oil release agents lies not only in the material itself but also in its systematic matching with spraying processes, mold temperatures, and molding cycles.

From a manufacturing systems perspective, although this nanometer-level film does not constitute the product body, it directly determines the production takt time and yield rate. It acts as the simplest physical barrier, maintaining the delicate balance between "molding" and "releasing" in a dynamic thermal-mechanical field, serving as an indispensable interfacial mediator for high-efficiency, high-quality molding processes.


General fluorosilicone rubber MY FHTV 3260 series