Soudal Silirub HT-A High Temperature Resistant Acetoxy Silicone Sealant - Black
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Product Information
Full details
Soudal Silirub HT-A is a professional-grade, elastic single-component silicone sealant engineered for technicians, mechanics, and heating engineers who require reliable seals in extreme heat environments. Its primary benefit is its ability to maintain permanent elasticity while resisting temperatures up to 285°C, making it superior to standard silicones for engine and heating maintenance; however, users should be aware that it utilizes an acetoxy curing system, which may not be suitable for sensitive alkaline substrates.
All features
| Colour | Black |
|---|---|
| Model Part Number | PTDSOU108265 |
| Brand | Soudal |
Extended Product Information
FAQs
What is the maximum temperature this sealant can handle?
Soudal Silirub HT-A is designed to withstand temperatures up to 285°C.
Can I use this on concrete or masonry?
No, it is an acetoxy silicone and is not recommended for alkaline substrates like concrete, as it may cause damage or poor adhesion.
How long does it take to cure?
Cure time depends on temperature and humidity, but it typically forms a skin within 5-10 minutes and continues to cure through the bead over 24-48 hours.
Is this sealant paintable?
No, this product is not designed to be painted over.
Can I use this for aquarium construction?
No, always use dedicated aquarium-safe sealants that do not contain fungicides or acetic acid that could harm marine life.
How should I store the cartridge?
Store in its original, unopened packaging in a cool, dry place to ensure it reaches its 12-month shelf life.
Troubleshooting
Sealant is not curing
Ensure the application area is not too cold or humid; acetoxy silicone requires atmospheric moisture and moderate temperatures to cure properly.
Sealant pulling away from the substrate
Check that the surface was thoroughly cleaned of all oil, grease, and dust before application, as surface contaminants prevent proper adhesion.
Pros and Cons
Pros
- Resists extreme heat up to 285°C
- Remains permanently elastic after curing
- Excellent adhesion to metal and glass
- Convenient ready-to-use 310ml cartridge
Cons
- Acetoxy cure releases acetic acid during hardening
- Not suitable for use on alkaline surfaces like concrete
- Limited color availability compared to decorative sealants
Setup, Compatibility & Care
To ensure maximum performance, surfaces must be clean, dry, and free of dust or grease. Use a standard caulking gun to apply the sealant in an even bead. Because this is an acetoxy-based product, avoid using it on copper or lead, as it may cause corrosion.
For storage, keep the cartridge in a cool, dry place to maintain the 12-month shelf life. Always ensure the cap is replaced tightly after use to prevent the remaining material in the cartridge from curing prematurely. If you need to smooth the sealant, do so within 5-10 minutes of application using a soapy water solution before the skin forms.