Nano Microporous Insulation Board Manufacturer

Published thermal data

Our standard microporous insulation board carries four-point thermal-conductivity data — 0.021 W/(m·K) at 200 °C, 0.025 at 400 °C, 0.028 at 600 °C, and 0.034 at 800 °C — the same temperature points a furnace-backup design references. Boards are produced in densities of 220–280 kg/m³ (the 250–350 kg/m³ range gives the best balance of conductivity and handling), from fumed silica with infrared opacifiers and a small fibre reinforcement. Standard boards carry a 1100 °C classification temperature and are rated for continuous service up to 1000 °C; hot-face shrinkage stays below 2% at 800 °C.

Typical ladle backup-layer builds

Ladle backup insulation is specified from the working lining outward. A representative build places a thin microporous board — typically 5–7 mm — directly against the steel shell, followed by a lightweight or high-alumina brick course, a castable layer, and finally the working brick. Keeping that first layer thin is deliberate: it can be added to an existing lining without redesigning the refractory stack or enlarging the shell. Reported shell-temperature reductions for builds of this type span a wide band, roughly 80–130 °C, and the width of that band is the useful part — the outcome depends on shell geometry, ambient conditions and the working lining, so a single figure quoted without the lining drawing should be read with caution. You can check a build against your own target shell temperature with our ladle insulation thickness calculator, or send us the lining drawing and we will review it.

Honest specifications

We state the limits, not just the headline numbers. Standard boards are stocked at 1000 × 615 mm in thicknesses of 10–50 mm; sizes outside that matrix are custom and carry a set-up cost. Above the 1000 °C continuous-service limit, shrinkage increases and the board should be de-rated in design — we say so at quotation stage rather than after delivery. Furnace atmosphere matters too: thermal conductivity is lowest under vacuum (around 0.01 W/(m·K)) and higher in hydrogen, so atmosphere-specific selection is part of our sizing support. Lead times are quoted as working-day ranges, because ocean freight and customs clearance introduce variance we do not control.

Application depth

One board formulation covers the whole steelmaking route, so a single grade and a single quality system carry from the ladle through to the reheat furnace. The board works as a backup layer behind the working lining in ladles, tundishes and torpedo ladles; as a wrap on hot-blast ducts, RH degasser walls and walking-beam furnace water-cooled skids; and as a thin alternative to thick insulating brick wherever lining space is already fixed. Each of those positions has its own design note on this site, so the constraints that apply to your route are one click away.