RTV-2 Silicone (Room Temperature Vulcanizing Silicone - 2-Part)
Definition:
RTV-2 is a two-component silicone that cures at room temperature or slightly elevated temperatures. It consists of a base and a curing agent, mixed in a specific ratio to initiate the curing process.
Curing Process:
Cures at room temperature or with mild heating.
The curing speed depends on the type of catalyst (platinum-cured or tin-cured).
Properties:
Highly versatile and used for mold making, encapsulation, and coating.
Offers excellent flexibility, tear strength, and chemical resistance.
Typically has lower viscosity than LSR, making it easier to pour and cast.
Applications:
Ideal for creating molds for casting resins, plaster, or wax.
Used in prototyping, electronic encapsulation, and artistic sculptures.
Processing:
Generally processed manually, requiring mixing and degassing.
LSR (Liquid Silicone Rubber)
Definition:
LSR is a high-purity, two-component liquid silicone that cures at high temperatures, typically in an injection molding process.
Curing Process:
Requires high heat (150°C to 200°C) and pressure to cure.
Fast curing time compared to RTV-2.
Properties:
Designed for high-volume production.
Superior mechanical strength, heat resistance, and elasticity.
Biocompatible, making it suitable for medical and food-grade applications.
Applications:
Used in medical devices, automotive seals, kitchenware, and consumer goods.
Ideal for manufacturing gaskets, seals, and keypads.
Processing:
Processed in automated systems like injection molding machines for mass production.
Key Differences:
| Feature | RTV-2 Silicone | LSR (Liquid Silicone Rubber) |
|---|---|---|
| Curing | Room temperature or mild heat | High temperature (150°C-200°C) |
| Viscosity | Lower, pourable | Higher, used in injection molding |
| Applications | Mold making, prototyping | High-volume industrial parts |
| Processing | Manual mixing | Automated systems |
| Biocompatibility | Limited (varies by formulation) | High, suitable for medical use |
| Production Volume | Low to medium | High |
Choosing the Right Silicone
Use RTV-2 Silicone for custom molds, prototypes, and applications requiring versatility and low setup costs.
Opt for LSR when producing high-volume, precision parts for industries like medical, automotive, and food-grade products.