Aerogel vs Mineral Wool Insulation — Compared

Updated 10 June 2026 · ASTM C680 / ISO 12241 basis · by the Inzonex engineering team

Direct answer: Aerogel has a much lower thermal conductivity (k ≈ 0.015–0.020 W/m·K) than mineral wool (k ≈ 0.040–0.045), so it reaches the same R-value in roughly half to a third of the thickness — but it costs several times more per m². Mineral wool is the default for most hot equipment on cost; aerogel wins where space is tight (clearances, walkways, tracing) or weight matters.

Head-to-head

	Mineral wool	Aerogel blanket
k-value (W/m·K)	0.040–0.045	0.015–0.020
Thickness for same R	baseline (e.g. 50 mm)	~⅓–½ (e.g. 20–25 mm)
Temperature range	up to ~640 °C (mat)	up to ~650 °C
Cost per m²	baseline	~3–8× higher
Water/CUI	absorbs if unprotected	hydrophobic
Best for	most hot equipment, cost-driven	tight clearances, low profile, weight

When to choose which

Choose mineral wool for the bulk of hot pipes, valves, tanks and HRSG fittings — it delivers 90–98% heat-loss reduction at the lowest cost, and our removable jackets are built around it (50 mm ≤220 °C, 100 mm above). Choose aerogel where you cannot fit the thickness: pipes close to walls or each other, under walkways, around tracing, or where added weight is a problem — you get the same R in a much thinner, hydrophobic cover, at a higher price.

Both work in removable covers

Aerogel and mineral wool are both used as the core of removable (modular) insulation jackets. The choice is about thickness, weight and budget — the heat-loss saving and the touch-safe ≤45 °C surface are achievable with either; the calculator sizes the thickness for your surface temperature.

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FAQ

Is aerogel better than mineral wool?

Aerogel conducts about 2–3× less heat, so it hits the same R-value in a third to a half of the thickness — but costs several times more. For most hot equipment mineral wool is more cost-effective; aerogel is best where space or weight is constrained.

How much thinner is aerogel than mineral wool?

For the same R-value, roughly one-third to one-half the thickness, because aerogel's k (≈0.015–0.020) is about half mineral wool's (≈0.040–0.045).

What is the temperature limit of aerogel insulation?

High-temperature aerogel blankets are rated to around 650 °C, similar to high-temperature mineral-wool mat, so both suit hot industrial surfaces.

Is aerogel worth the extra cost?

Where you have room for mineral wool, usually not — mineral wool delivers the same saving cheaper. Aerogel pays off when thickness, clearance or weight is the limiting factor, or where its hydrophobic nature helps against CUI.