FAQs
What kind of silicone rubber is RTV-3120, and what is it used for?
RTV-3120 is a two-part, condensation-cure, room-temperature-vulcanizing (RTV) silicone rubber base intended for mold-making, potting, encapsulation, and general silicone casting applications. It cures into a flexible rubber suitable for detailed mold reproduction and encapsulation.
What are the mechanical and thermal properties of cured RTV-3120 silicone rubber?
When cured, RTV-3120 exhibits a service temperature range from –55 °C to up to 300 °C, elongation of around 128%, Shore A hardness ~56, tensile strength ~582 psi, and good dielectric strength, making it suitable for parts that must withstand mechanical stress, thermal variation, or encapsulate electronic/electrical components.
How is RTV-3120 mixed and cured?
RTV-3120 must be mixed with a compatible catalyst. A typical mix ratio is 10:1 (base to catalyst) by weight. Once mixed, the low-viscosity base allows easy pouring, and the silicone cures at room temperature, even for thick sections. Depending on the catalyst used, cure times and demold times vary.
What types of projects or applications is RTV-3120 best suited for?
It is ideal for mold making (castings, prototypes), encapsulation or potting of electrical/electronic assemblies, vibration- or shock-absorbing rubber parts, and general silicone fabrication where flexible, heat-resistant rubber is needed.
Are there any special processing steps or precautions when using RTV-3120?
Yes. Before mixing, the base should be stirred as fillers may settle. When mixing with a catalyst, avoid over-vigorous mixing (to prevent air entrapment). For best results, especially for dense castings or encapsulation, vacuum degassing is recommended if possible. Use appropriate release agents when molding if needed.
