RTVsilikonitiivisteet

RTV silicone sealants, known in Finnish as RTVsilikonitiivisteet, are a class of room‑temperature vulcanizing silicone adhesives that cure at ambient temperature by reacting with moisture in the air. They are formed from polydimethylsiloxane polymers with various filler, hardener, and curing agent compositions that give them unique mechanical, chemical, and thermal properties.

The most common RTV silicone sealants are of two types: type‑A (hydrosilylation) and type‑B (hydrosilylation cross‑linking). Type‑A systems use platinum catalysts and provide rapid curing in a few minutes, while type‑B systems use tin catalysts and may require longer curing times. RTV sealants are available in silicone, silicone‑filled, or silicone‑based formulations, each offering different levels of flexibility, electrical insulation, and resistance to heat and chemicals.

RTV silicone sealants are used in a wide range of applications. In construction they seal joints, gaps, and seams in windows, doors, and roofing. In automotive and aerospace they provide vibration damping, electrical insulation, and protection against water and corrosion. In electronics, precise silicone gaskets and potting compounds protect circuit boards from moisture and temperature extremes. They can also be used in crafting, modeling, and mold making because of their non‑stick properties.

Safety considerations include the use of compatible surfaces, proper ventilation during application, and avoidance of inhalation of aerosols. Environmental concerns arise from the use of platinum and tin catalysts, but many modern formulations minimize hazardous waste. Recycling is limited due to the cured silicone’s chemical stability. Overall, RTV silicone sealants remain a versatile and widely adopted material in many industries.