Insulation for Above 600 °C — furnaces, kilns, gas-turbine exhausts, catalytic units

Fibre territory: AES/RCF blanket, silica textiles, microporous panels. Multi-layer design is standard — a high-temp inner layer takes the punishment, a cheaper stone-wool outer layer does the bulk insulating.

Valid materials

What survives Above 600 °C

Material (serves this class)	Max service	λ at 700 °C duty
Ceramic fibre (RCF / AES blanket)	1200 °C	0.084
Microporous (fumed-silica) panels	1000 °C	0.027
Silica needle mat / fabric	1000 °C	0.075

Computed · DN100 at 700 °C, 50 mm

The numbers at this temperature

Material	λ W/m·K	Loss W/m	Surface	Saving €/m·yr	t CO2/m·yr
Ceramic fibre (RCF / AES blanket)	0.084	508	95 °C	€943	3.5
Microporous (fumed-silica) panels	0.027	178	46 °C	€1,104	4.0
Silica needle mat / fabric	0.075	459	88 °C	€967	3.5

DN100 pipe at 700 °C, 50 mm insulation, per metre of pipe; bare loss 2,442 W/m. λ at mean temperature; € and CO2 per metre·year at €0.05/kWh, 8000 h, 82% efficiency. Method: ASTM C680 simplified (h=10).

FAQ

Questions on this topic

What insulation is best for above 600 °c?

Shortlist for furnaces, kilns, gas-turbine exhausts, catalytic units: Ceramic fibre (RCF / AES blanket), Silica needle mat / fabric, Microporous (fumed-silica) panels. Fibre territory: AES/RCF blanket, silica textiles, microporous panels.

How much heat does a pipe at 700 °C lose?

A bare DN100 pipe at 700 °C loses ≈2,442 W per metre in still air (ASTM C680 simplified). 50 mm of ceramic fibre (rcf / aes blanket) cuts that to ≈508 W/m — ≈€943 and 3.45 t CO2 saved per metre·year at €0.05/kWh.