Summary: Silicone resists heat and weathering via the Si-O-Si backbone; with heat-resistant fillers/pigments it withstands hundreds of °C for exhausts, furnaces and stacks. The ceiling depends on resin, heat-stable pigments and cure.
Mechanism
High Si-O bond energy gives thermal stability; higher temperatures need inorganic/ceramic resins — common silicone resists about 200-400°C, higher uses silicate/ester-ceramic systems.
Key data
- Common silicone heat coatings about 200-400°C; higher needs inorganic silicate-zinc/ceramic.
- Heat-stable pigments (chrome black, copper ferrite) fix colour at high temperature.
- Multi thin coats with staged cure beat one thick coat.
Grade
| System | Heat |
|---|---|
| Silicone | about 200-400°C |
| Silicate/ceramic | higher, up to 600°C+ |
Defects & fixes
- Flaking at heat: thermal shock / thick — thin multi-coat, slow ramp.
- Discolour: wrong pigment — use heat-stable inorganic pigment.
- Peel from undercure — ensure cure temperature.
FAQ
Why does silicone resist heat?
High Si-O bond energy is thermally stable; with fillers/pigments it takes hundreds of °C.
600°C still silicone?
No — common silicone falls short; use silicate/ceramic or inorganic zinc.
Why thin multi-coats?
Avoids thick-film thermal-stress flaking; staged cure is steadier.
Ref: heat-resistant coating systems and temperature grades (public).
Kexin New Materials (Guangdong) Co., Ltd. · 2026-09-18