What is RTV silicone?

RTV silicone is a silicone rubber that cures at room temperature and does not require the application of heat or pressure. There are two main types of RTV: RTV-1 (one-component systems that cure by humidity) and RTV-2 (two-component systems that react chemically). Both are usually based on vinyl methyl silicone (VMQ). In contrast to HTV or LSR RTV will not be used for classic Spritz- or Moulded parts but above all for Tight-for bonding, potting or moulding applications. The material cures independently, remains elastic and adheres to many substrates - ideal for repair, sealing and prototyping processes.

 

Properties of RTV silicone

RTV silicone differs significantly from HTV and LSR. There are differences, particularly in terms of processing, purity and mechanical strength:

  • Curing without heat or pressure, by moisture (RTV-1) or chemical reaction (RTV-2)
  • Can be applied directly from the cartridge or by mixing both components
  • RTV-1: Difficult processing in moulding processes due to cross-linking with water from the air from the outside to the inside
  • Softer and less tensile than HTV or LSR
  • Good adhesion often without surface treatment on glass, metal, ceramics, plastics and rubber, especially with adhesion-modified types
  • Good weather, UV and ozone resistance
  • Insensitive to water, Oiling and many chemicals, but lower resistance to fuels compared to HTV/FVMQ
  • Suitable for protecting sensitive electronic components from moisture or dust
  • No post-curing with heat necessary

 

Application of RTV silicone

  • Electronics: RTV is often used as a potting or coating material to protect electronic components from moisture, dust or vibration.
  • Mechanical and plant engineering: Use as Tight- and adhesive compound on flanges, housings, pipes or aggregates. RTV is suitable when a permanent, flexible sealant is to be applied directly on site
  • Automotive industry: Use in assembly or maintenance as a liquid sealant
  • Building and sanitary technology: RTV silicones are standard for joint sealing, window, glass and metal connections. They remain permanently elastic and weather-resistant