What are the types of silicone injection molding plastics?

Silicone injection molding plastics can be categorized primarily into two main types based on their states and curing methods:

Liquid Silicone Rubber (LSR)

Two-Part System: LSR typically comes in two parts (Part A and Part B) that are mixed together before injection. One part contains a platinum catalyst, while the other contains a crosslinker.
Platinum-Cured: This type of silicone is cured using a platinum catalyst, which results in a fast curing process and high-quality end products.
Applications: LSR is widely used in medical devices, kitchenware, baby products, automotive parts, and electronics due to its excellent flexibility, biocompatibility, and resistance to extreme temperatures.

High Consistency Rubber (HCR)

Gum-Based Silicone: HCR is a gum-like silicone that requires more mechanical mixing and processing compared to LSR.
Peroxide-Cured: This type of silicone is typically cured using a peroxide catalyst, although it can also be cured using platinum.
Applications: HCR is used in applications requiring high mechanical strength, such as seals, gaskets, hoses, and other industrial components.
Specialty Silicone Materials:

Fluorosilicone Rubber (FSR)

Chemical Resistance: FSR combines the properties of silicone with enhanced resistance to fuels, oils, and solvents.
Applications: It is commonly used in aerospace, automotive, and industrial applications where exposure to harsh chemicals is expected.
Silicone Elastomers with Additives

Custom Formulations: These silicones may have added fillers or additives to impart specific properties such as increased thermal conductivity, electrical conductivity, flame retardancy, or improved mechanical strength.
Applications: These are used in specialized applications such as electronics, thermal management, and safety equipment.
Medical Grade Silicones

Biocompatibility: These silicones are specifically formulated to meet stringent medical and healthcare standards, ensuring they are safe for contact with human tissues and fluids.
Applications: Used in medical implants, prosthetics, and other healthcare-related products.
Each type of silicone injection molding plastic offers distinct advantages and is chosen based on the specific requirements of the application, including mechanical properties, environmental resistance, and regulatory compliance.