Microporous (fumed-silica) panels at 300 °C — heat-loss table

λ = 0.023 W/m·K at mean temperature ((300+20)/2 = 160 °C, from the published curve). Pipe losses per metre, four thicknesses, savings vs bare.

Pipe	30 mm W/m	50 mm W/m	80 mm W/m	100 mm W/m	BARE W/m	Surface @50 mm	Saving €/m·yr @50 mm	t CO2/m·yr
DN25	38	29	23	21	294	27 °C	€129	0.47
DN50	56	41	31	28	530	28 °C	€239	0.87
DN80	75	52	39	34	782	29 °C	€356	1.30
DN100	91	63	46	40	1,005	29 °C	€460	1.68
DN150	125	84	60	51	1,480	30 °C	€681	2.49
DN200	158	105	73	62	1,927	30 °C	€889	3.25
DN300	224	146	99	83	2,849	31 °C	€1,319	4.83

Assumptions: 20 °C ambient, still air (h=10 W/m²·K combined), €0.05/kWh fuel, 8000 h/yr, 82% efficiency, 0.183 kg CO2e/kWh (DESNZ 2024). Flat surfaces at this duty: bare 2,800 W/m² → 124 W/m² at 50 mm (≈€1,305/m²·yr saved). Method: ASTM C680 simplified — methodology. Your exact case: free calculator.

Context

All materials at 300 °C

Material	λ W/m·K	Loss W/m	Surface	Saving €/m·yr	t CO2/m·yr
Stone wool (mineral wool)	0.057	147	42 °C	€419	1.5
Glass wool	0.054	140	41 °C	€422	1.5
Ceramic fibre (RCF / AES blanket)	0.060	154	43 °C	€415	1.5
Aerogel blanket	0.029	78	32 °C	€452	1.7
Calcium silicate	0.070	177	46 °C	€404	1.5
Expanded perlite	0.073	184	47 °C	€401	1.5
Cellular glass	0.062	158	43 °C	€413	1.5
Microporous (fumed-silica) panels	0.023	63	29 °C	€460	1.7
E-glass needle mat	0.053	137	40 °C	€424	1.6
Silica needle mat / fabric	0.055	142	41 °C	€421	1.5

DN100 pipe at 300 °C, 50 mm insulation, per metre of pipe; bare loss 1,005 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).

Material datasheet: Microporous (fumed-silica) panels → · temperature class: by temperature →

FAQ

Questions on this topic

How much heat does a pipe at 300 °C lose with microporous (fumed-silica) panels?

With 50 mm at 300 °C (λ=0.023 at mean): DN50 loses 41 W/m, DN100 63 W/m, DN200 105 W/m — vs 1,005 W/m bare for DN100. Full table on this page.

What surface temperature does microporous (fumed-silica) panels give at 300 °C?

≈29 °C with 50 mm on DN100 (20 °C ambient, still air). Personnel-protection targets (≤45–60 °C) may need more thickness — see the 80/100 mm columns.