Quote:

If weight matters anywhere, it matters in aircraft!

http://www.aircraftspruce.com/catalog/appages/insulator.php



Nice !
And I didn't think the price was outrageous either.
If you look away from stuff that is marketed strictly as " automotive " and especially " high performance " , you can often find similar products for cheaper prices.
I use the McMaster-Carr catalog and the sheer volume of supplies they have is amazing.
But back when header wrap was in vogue , I bought and used some pipe insulation from them that worked great and was about 1/2 price.
Think of them as the corner hardware store on steroids.