Question 1

What is the R value of this material and does it contain any amount (at all) of fiberglass?  What % of actual Aerogel?

Accepted Answer

It looked and felt like aerogel.  I compared it to 1/2" Solimide foam insulation and it performed almost twice as well.  We are insulating a small oven at 400°F.
Will definitely use aerogel again and are looking for larger sheets.  I did speak with a manufacturer who was surprised I found this material in small quantity at a good price.

Question 2

Can I use this to fill air gap around a flue for a tankless water heater?

Accepted Answer

Sorry- btw, *never* use synthetic foams as insulation in enclosed spaces or where it could possibly get hot enough to burn. Spray PE is excellent insulator applied correctly, but outgasses horrible things like formaldahyde and phosgene. For the number of times insulation gets put in (once) it's worth doing right.

Question 3

Can you bend it, like wrapping aroumd a tube?

Accepted Answer

There is a bend-radius value. If this is the Aspen Aerogel, bending it to 5=5" isn't a problem EXCEPT for how much dust it will liberate. For God's sake, encapsulate any pieces you use in garbage bag plastic and seal it. Do NOT shake it or re-open. Always wear N95 PPE AND Tyvek - trust me.

Question 4

How flexible is the material?

Accepted Answer

I've used this kind of insulation extensively in high altitude electronics. There is nothing better for R  value, this cannot burn or outgas, can never become flammable and can never absorb water/moisture. The drawbacks are becomes very dusty if you wrap it, bend it or even move it, the dust is bad like sand dust is (think silicosis, pulmonary edema). I strongly recommend a careful plan for what shapes are needed, how they'll be cut, how they'll be encapsulated before hand. The first half of the job is all of that and it's the most time consuming. It's difficult to cut - can only use things like tin snips which dull rapidly. Get a $150 self-sharpening power shear. For SURE wear surgical type gloves maybe two pair, N95 respirator or better, goggles or better face shield and tyvek suit. No joke.  Do NOT manipulate this stuff indoors. When you are done, immediately shower with LOTS of shampoo (dust is hydrophobic, which means practically impossible to get wet, so as difficult to wash off.)  I have installed hundreds of square feet of this stuff and when done right - there is nothing better, and nothing safer.

ASIN	B07HFZHTRL
Best Sellers Rank	#208,245 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #251 in Pipe Insulation
Brand	HiwowSport
Brand Name	HiwowSport
Coverage	1 Square Feet
Customer Reviews	3.5 out of 5 stars 46 Reviews
Item Dimensions L x W	0.47"L x 0.47"W
Item Thickness	10 millimeters
Item Weight	220 kg
Manufacturer	Hiwowsport
Manufacturer Part Number	08-052gel
Material	Fiberglass, nano silica aerogel
Material Type	Fiberglass, nano silica aerogel
Number of Items	1
Number of Packs	1
Product Dimensions	0.47"L x 0.47"W
Recommended Uses For Product	thermal insulation
UPC	651312504740
Unit Count	1 Count

Aerogel Insulation Hydrophobic Mat of High Temp. Blanket 12''x12'',Thickness 10MM

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