Guangzhou, Guangdong , China.

[email protected]

+86 13539860818

Nano microporous insulation boards for high-temperature industrial applications

Microporous Insulation Board vs. Ceramic Fiber: A Thermal Conductivity Comparison

Engineers who specify high-temperature insulation face a recurring question: should the backup layer be a ceramic-fiber blanket or a nano microporous insulation board? Both technologies have shipped in industrial plants for decades, and both are routinely listed in vendor quotation sheets — but they behave very differently at operating temperature, behave very differently under vibration, and behave very differently on the procurement invoice. This article walks through the chemistry, the numbers, and the decision logic so that the next specification is the right one.

What Is a Nano Microporous Insulation Board?

A nano microporous insulation board is a rigid panel made by compressing a fumed silica matrix with ceramic opacifiers and a small percentage of glass-fibre or ceramic-fibre reinforcement. The compression creates a pore structure with a a mean pore size of 10–30 nm — smaller than the mean free path of air at room temperature, which suppresses gas-phase thermal conduction inside the pores. A second mechanism (titanium-dioxide or silicon-carbide opacifier particles) blocks infrared radiation across the body of the board. Together they push thermal conductivity down to 0.020 W/(m·K) at 25 °C — the lowest of any rigid industrial board.

Microporous board is dense, dry, and dimensionally stable. Bulk density is 220–280 kg/m³ and the board holds its shape up to the 1000 °C continuous service limit without measurable linear shrinkage. The board is supplied in standard panel sizes (1000 × 615 mm is the most common) and thicknesses from 10 mm to 50 mm, with optional facings — PE film, 0.05 mm aluminium foil, or woven glass-fibre fabric — for moisture, vapour, and abrasion resistance.

What Is Ceramic-Fibre Blanket?

Ceramic-fibre blanket is a needled blanket made from alumina-silica fibre (typically 45–60 % Al₂O₃, 40–55 % SiO₂). The fibres are mechanically interlocking rather than bonded by chemistry, which is why ceramic-fibre blanket feels soft to the touch and conforms easily to curved surfaces. Bulk density is 64–200 kg/m³ (much lighter than microporous board) and thermal conductivity is roughly 0.040–0.090 W/(m·K) at 25 °C depending on density.

Ceramic fibre carries classifications: the EU Carcinogen Directive (CLP) places certain biosoluble alkaline-earth-silicate (AES) fibre formulations outside the cancer-risk category, while traditional refractory ceramic fibre (RCF) is now restricted under many occupational health frameworks. Procurement specifiers in the EU often ask for an AES / bio-soluble grade by default. The thermal conductivity advantage of microporous board carries a price tag — board is typically 3–8× the cost of ceramic-fibre blanket per square metre at the same thickness.

Thermal Conductivity Numbers, Side by Side

Comparing thermal conductivity directly is the most rigorous way to evaluate the two materials. The numbers below are typical published values for commercial products; actual lot-to-lot variation can be 5–10 %.

The gap widens with temperature because microporous board has a far steeper density-driven drop in gas conduction, while ceramic-fibre blanket is dominated by solid-fibre conduction that rises sharply above 400 °C. If the backup layer sits behind a working lining at sustained 600 °C, microporous board at 30 mm replaces roughly 150 mm of ceramic-fibre blanket at equivalent heat-stopping duty.

When Microporous Board Is the Right Specification

Specify nano microporous insulation board when: (1) hot-face temperature is in the 600–1000 °C range and thermal budget per millimetre matters; (2) the insulation is concealed in a permanent installation rather than re-entered for inspection; (3) the host equipment has limited envelope thickness and 100+ mm of ceramic blanket would not fit; (4) HSE considerations call for a non-fibre-shedding skin (PE foil or aluminium foil facing); or (5) thermal-cycling life matters more than first cost.

For procurement details on the standard product, see our standard microporous insulation board page; for laminated/foil-faced variants see the Aluminium Foil-Faced and PE-Faced boards, or browse the full microporous insulation range.

When Ceramic-Fibre Blanket Still Wins

Ceramic-fibre blanket is the right specification when the design constraint is upfront cost per square metre, the operating temperature is in the 900–1 200 °C range where board hits its limit, the geometry is highly irregular (pipe penetrations, valve bonnets, expansion joints), or the installation is temporary. Ceramic-fibre blanket also wins where 80 kg/m³ loose fill is preferred over rigid panel for thermal-shock tolerance.

For highly irregular geometry in a high-temperature process, our Custom-Shaped Nano Microporous Insulation — CNC-formed to ±1 mm — replaces ceramic-fibre blanket in installations where rigid board is otherwise hard to fit.

Decision Checklist

Talk to a microporous insulation engineer

Request a Quote — Microporous vs Ceramic-Fibre Comparison

Lifecycle Cost: A 5-Year Comparison

The first-cost gap narrows when you model the full lifecycle. A representative specification is a 200 m² furnace backup, hot-face 800 °C, target heat flux 200 W/m², designed for a 10-year service interval. Working from published thermal-conductivity numbers, the design thickness is 60 mm of microporous board versus 200 mm of ceramic-fibre blanket for the same heat-stopping duty. At an installed cost of USD 95/m² for microporous board versus USD 25/m² for ceramic-fibre blanket, the first cost is USD 19 000 for board versus USD 5 000 for blanket — board is roughly four times the first cost.

But the board has measurably longer service life in many installations (15+ years verified versus 7–10 years for AES blanket in similar service). Energy savings from the lower thermal conductivity of board add up too: a 200 m² backup with the assumed boundary conditions saves roughly 11 MWh/year versus an equivalent ceramic-fibre blanket specification. At industrial electricity tariffs (USD 0.08–0.12 /kWh), that is USD 880–1 320 per year — USD 4 400–6 600 over the 5-year window or USD 8 800–13 200 over 10 years. Combined with the longer service interval, the board specification lands at approximately the same total cost of ownership over 10 years and is roughly 20 % cheaper over 15 years.

Summary: A Practical Distinction

Nano microporous insulation board and ceramic-fibre blanket are not interchangeable. The board is the high-performance specification when heat-stopping duty per millimetre matters and the envelope is tight; the blanket is the right specification when first cost is the binding constraint or the geometry is highly irregular. For new industrial high-temperature installations above 600 °C, our recommendation is microporous board as the default specification; below that temperature and for concealed or temporary installations, ceramic-fibre blanket remains the cost-effective choice. Use the decision checklist above for the next specification, and request our thermal-conductivity data pack for side-by-side number verification.

Specify the Right Board

Compare the full range before you write the specification: nano insulation board, glass cloth faced microporous board, microporous board vs calcium silicate, VIP panel vs microporous board.