Microporous (fumed-silica) panels at 500 °C — heat-loss table

λ = 0.025 W/m·K at mean temperature ((500+20)/2 = 260 °C, using the Inzonex generic class 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	70	53	43	39	504	33 °C	€220	0.80
DN50	104	75	58	51	909	35 °C	€407	1.49
DN80	138	97	72	64	1,341	36 °C	€606	2.22
DN100	169	117	85	74	1,724	37 °C	€784	2.87
DN150	232	157	111	95	2,538	39 °C	€1,162	4.25
DN200	292	194	135	115	3,304	39 °C	€1,517	5.55
DN300	415	271	185	155	4,884	40 °C	€2,251	8.24

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 4,800 W/m² → 230 W/m² at 50 mm (≈€2,229/m²·yr saved). Method: ASTM C680 simplified — methodology. Your exact case: free calculator.

Calculation basis. This table uses an Inzonex generic material-class curve, not a declared value for a named product. Curve points at mean temperature: 100 °C: 0.022 W/m·K; 200 °C: 0.024 W/m·K; 400 °C: 0.028 W/m·K; 600 °C: 0.034 W/m·K; 800 °C: 0.040 W/m·K. Linear interpolation is used between points; the nearest endpoint is retained outside this range. No product performance outside its declared range is established. Named-product conductivity values and primary documents are listed separately; do not substitute a generic class result for a product specification.

Context

All materials at 500 °C

Material	λ W/m·K	Loss W/m	Surface	Saving €/m·yr	t CO2/m·yr
Stone wool (mineral wool)	0.079	339	70 °C	€675	2.5
Ceramic fibre (RCF / AES blanket)	0.069	300	65 °C	€694	2.5
Aerogel blanket	0.038	173	46 °C	€757	2.8
Calcium silicate	0.083	356	73 °C	€667	2.4
Expanded perlite	0.086	367	75 °C	€662	2.4
Microporous (fumed-silica) panels	0.025	117	37 °C	€784	2.9
E-glass needle mat	0.068	297	64 °C	€696	2.5
Silica needle mat / fabric	0.062	274	61 °C	€707	2.6

DN100 pipe at 500 °C, 50 mm insulation, per metre of pipe; bare loss 1,724 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 500 °C lose with microporous (fumed-silica) panels?

With 50 mm at 500 °C (λ=0.025 at mean): DN50 loses 75 W/m, DN100 117 W/m, DN200 194 W/m — vs 1,724 W/m bare for DN100. Full table on this page.

What surface temperature does microporous (fumed-silica) panels give at 500 °C?

≈37 °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.