WEICON Silicon HT-300 FB 280 ml, red high-temperature acetoxy silicone sealant for ovens, exhausts and heating systems
Product code: 10104250
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Product description
WEICON Silicon HT-300 FB 280 ml is a high-temperature, acetoxy-curing silicone adhesive/sealant in red. It remains elastic and weather-resistant and withstands up to +280 °C (short-term +300 °C), making it ideal for ovens, exhaust systems and heating installations.
Benefits and key features
- Temperature resistance −40…+280 °C, short-term to +300 °C
- Skin formation ~8 min; cure rate 2–3 mm / 24 h
- High elasticity – elongation ~300%, hardness ~30 ShA
- Strong adhesion to steel, aluminium, glass and ceramics
- Solvent-free; acetoxy cure
Properties and applications
- High-temp sealing: industrial ovens, boilers, heat exchangers and chambers.
- Automotive / MRO: exhaust systems, heat shields, flue connections.
- HVAC: duct penetrations, flanges, heater housings.
- Bonding: metal and glass parts exposed to vibration and temperature cycles.
- Note: HT-300 is not paintable; clean and degrease substrates before use.
Technical parameters
| Parameter | Value |
|---|---|
| Colour | red |
| Net volume | 280 ml (FB cartridge) |
| State / appearance | paste, 1-component polysiloxane (acetoxy) |
| Density (20 °C) | ~1.18 g/cm³ |
| Curing type | moisture-curing (acetoxy) |
| Skin formation | ~8 min |
| Cure rate (first 24 h) | ~2–3 mm |
| Hardness | ~30 Shore A |
| Elongation at break | ~300% |
| Max. permissible movement | ~15% |
| Service temperature | −40…+280 °C, short-term +300 °C |
| Paintability | no – not paintable |
| Building material class | B2 (DIN 4102) |
| Odour | characteristic (acetoxy) |
| Flash point (closed cup) | > 93.3 °C |
| CLP classification | mixture not classified as hazardous |
| Transport | not regulated by ADR/IMDG/IATA |
Storage recommendations
Store upright in the original sealed cartridge, in a dry, cool place away from sunlight and heat sources. Recommended shelf life: up to 12 months at approx. +5…+25 °C. Clean and degrease substrate before application.
FAQ
1) Is HT-300 paintable?
No, select the correct colour before application.
2) Temperature resistance?
Service up to +280 °C, short-term up to +300 °C.
3) How fast does it cure?
Skin ~8 min; ~2–3 mm/24 h at 23 °C / 50% RH.
4) Substrates it bonds to?
Steel, aluminium, glass, ceramics and many mineral substrates.
5) Surface preparation?
Remove dust, oils and grease; use cleaner/primer if needed.
Product safety
Responsible person in the EU
WEICON GmbH & Co. KG
Königsberger Str. 255
48157 Münster, Germany
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