Table of Contents
When deciding on sealants, you will see the terms RTV and silicone. Related but distinct, important differences between them have implications for their performance and applications.
Basic Definitions
RTVA (Room Temperature Vulcanizing): Sealant that cures at room temperature with heat. The word itself refers to the process of curing; not the makeup of the material.
Silicone: A synthetic polymer composed of silicon, oxygen, carbon and hydrogen that can be found in both adhesives and sealants.
Key Differences
| Feature | RTV | Silicone |
|---|---|---|
| Composition | Is releasably attached with a polyurethane, polysulfide or acrylic | Always silicone-based |
| Curing | Requires surface contact/air moisture | Cures via moisture or catalyst |
| Cure Time | Faster (typically 24 hours) | Slower (hours to days) |
| Temperature Resistance | Good | Excellent (wider range) |
| UV Resistance | Moderate | Superior |
| Cost | More affordable | More expensive |
Common Applications
RTV is ideal for:
Automotive gaskets and seals
General construction joints
Manufacturing applications
Projects requiring quick curing
Silicone excels at:
Extreme temperature environments
Outdoor/UV-exposed applications
Electronics and electrical insulation
Medical and food-grade uses
Choosing the Right Product
Consider these factors when selecting:
Required temperature resistance
Need for UV protection
Curing time constraints
Budget considerations
Surface materials being bonded
Knowing the differences help you to choose the perfect sealant for your exactly project requirement.
Sealant: Although RTV performs well overall, silicone lasts longer under tough conditions.
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