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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:
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Automotive gaskets and seals
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General construction joints
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Manufacturing applications
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Projects requiring quick curing
Silicone excels at:
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Extreme temperature environments
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Outdoor/UV-exposed applications
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Electronics and electrical insulation
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Medical and food-grade uses
Choosing the Right Product
Consider these factors when selecting:
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Required temperature resistance
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Need for UV protection
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Curing time constraints
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Budget considerations
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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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