How to Read an Aerogel Datasheet: The Numbers That Decide Your Purchase
An aerogel datasheet lists a dozen figures, and most of them will not change your decision. Five will. If you can read thermal conductivity, temperature, form, type, and the test standard behind them, you can compare any two products and spot the marketing. The directory pulls these into one place and links each to its source, for exactly that reason.
Here is how to read each one, and the trap in each.
Thermal conductivity, with its temperature
Lower means better insulation, and it is the number buyers lead with. Directory values run 13 to 70 mW/m·K. The trap is a single figure with no temperature attached, because λ rises with heat: a blanket reading 17 mW/m·K at room temperature can read 40 at 400°C. Read λ against the temperature it was measured at. A curve beats a hero number.
Maximum temperature, and the cold side too
This is the figure that most often removes a product from your list. Directory ratings span 500 to 1600°C. If your service is hot, match the rating to your worst case. If it is cryogenic, ask for the low-temperature rating as well, a separate number many sheets leave off entirely.
Product form
Blanket, panel, powder, and the rest are not interchangeable. Form decides how you install the material and whether you are buying a finished product or a feedstock to blend into something else. Settle it before you compare anything else, because it changes which suppliers are even relevant.
Aerogel type
Most commercial insulation is silica, and that is nearly all of what the directory lists today. Polymer and carbon aerogels exist for specific jobs that need higher toughness or different behavior with heat, and they read differently on the same axes. Know which chemistry a sheet describes before you compare its numbers against a silica product.
The standard behind the number
A conductivity or a temperature measured to a named method, ASTM C177, EN 12667, or ASTM C411, is one you can hold a supplier to. A number with no method behind it is a claim, not a measurement. Standards are the line between a spec and a slogan, and a serious supplier prints them.
What to ask for, because the sheets rarely standardize it
Density, hydrophobicity, water uptake, compressive strength, and thickness tolerance all matter for a real install, and suppliers report them inconsistently, when they report them at all. The directory does not force these into a common field yet, so treat a missing value as a question for the supplier, not a fact about the product. Ask, and get the answer in writing.
The habit that saves money
Two rules cover most of it. Never compare two numbers measured under different conditions. Never trust a number with no source. Every profile in the directory links each figure to where it was published, so you can read the datasheet and then check it against the page it came from.
See how the directory structures every spec, then read two suppliers side by side in the table.