Insulation Blankets – Thicknesses and Clearances
“Insulating areas with low clearances can be an issue, but it often depends on the particulars of an application and what the client is
wishing to achieve”, said Brett Herman, Firwin’s VP of Sales & Engineering. “For instance, sometimes just thinning out the insulation in areas of low clearance will still give the client sufficient insulation performance for the needs of his particular application. If, on the other hand, we are dealing with a relatively high temperature application, and the client has a particular temperature reduction goal that he wishes to achieve – this could be for personnel protection, or to ensure that nearby heat sensitive components are shielded from overheating – Whatever the reason, a lack of clearance means we are limited in the thickness of insulation that we can apply, which in turn can limit the amount of heat reduction that results”.
Solutions for Low Clearance Issues
High Performance Insulators
Insulation blankets are made up of 3 parts: The outer cover, also known as the `cold face`, the middle layer of insulation material, and the inner cover, or `hot face`. For most applications, the `standard` insulation blanket makeup of a silicone outer cover, 1 inch thick fiberglass, and a mesh inner liner, works fine. But certain applications demand alternative materials, be it because of very high temperatures, the environment where the insulation blankets will be operating, or in the case here, because of a combination of space constraints and desired insulation performance.
“Space constraints alone do not necessarily demand the use of an alternative insulator such as Aerogel”, said Brett. “It is possible that the customer`s needs can be met with a thin layer of fiberglass or superwool. An insulator like Aerogel is brought into the picture when the project needs insulation performance that typically could only be achieved with thicker insulation than the space allows.”
The chart below gives an indication of what kind of insulation effectiveness can be achieved even with a very thin layer of Aerogel insulation, compared to other insulations at standard 1″ thickness. As can be seen, even a thin 10 mm (approximately .4 inches) layer of Aerogel gives an insulation effectiveness near that of a 1″ thick fiberglass blanket.