Silicone rubber molds are widely used in industrial manufacturing, medical, food, and art reproduction due to their excellent high and low temperature resistance, good elasticity, and chemical stability. Their core material is silicone rubber, and depending on the application requirements, silicone rubber molds can be divided into various types, including room temperature vulcanized silicone rubber (RTV), high temperature vulcanized silicone rubber (HTV), and specially modified silicone rubber.
Room temperature vulcanized silicone rubber (RTV) is one of the most common silicone rubber mold materials and is available in both one-component and two-component varieties. RTV silicone rubber cures at room temperature without the need for additional heating, making it suitable for rapid mold production. It features excellent flowability and mold release, allowing for precise reproduction of fine textures. It is commonly used for replicating handicrafts, architectural models, and small industrial parts. RTV silicone rubber typically has a Shore A hardness between 20A and 40A, offering high flexibility and suitable for molds with complex structures.
High temperature vulcanized silicone rubber (HTV) requires high temperatures (typically 120°C to 200°C) for molding and is suitable for large-scale production. HTV silicone rubber offers superior mechanical strength and heat resistance, allowing for long-term use in temperatures ranging from -60°C to 250°C. Therefore, it is widely used in mold manufacturing for the automotive, electronics, and aerospace industries. HTV silicone rubber offers a wide range of hardness, from 10A to 80 Shore A, and can be adjusted to meet the mold release and durability requirements of different products.
To further enhance the performance of silicone rubber molds, they are often modified, such as by adding fillers (such as silica and calcium carbonate) to increase hardness and wear resistance, or by adding additives such as high-temperature, oil-resistant, and UV-resistant materials to adapt to specific environments. For example, fluorosilicone rubber retains the excellent elasticity of silicone rubber while enhancing its chemical and oil resistance, making it suitable for mold manufacturing in the chemical and food industries.
In summary, silicone rubber molds are primarily based on silicone rubber. Through various vulcanization methods and modification processes, they can meet diverse industrial needs. Whether it's the rapid mold-making capabilities of RTV or the high-temperature durability of HTV, silicone rubber molds, with their exceptional physical and chemical properties, have become an indispensable tool in modern manufacturing.
