None that I know of that actually work...

Why the problem with FG?

If duct/chase/hvac system is sealed fg particles are
become a non-issue.

If you looK thru the hvac forum posts there are a
couple about foil bubble foil wrap being used for ductwrap.
Read through them & you'll see why it isn't the ductwrap
choice of pro's

best of luck to you.

If the ductwork runs in the attic, I've heard someone using celluose by either build a trough around the ductwork with rigid foam and fill this cavity will blown in cellulose. The other options is to use all blown in cellulose.

I know you are correct about the foil faced bubble wrap.

But what about the cotton insulation that looks exactly the fiberglass?

I know it is more money, but it used exclusively in some industrial applications. Why not residential?

My belief is that some industrial applications may require a product to be user friendly so that repairs, rework, and remodels can be comfortably done. I do not think they care about that in the residential market. I also think the residential market is 98% driven by product cost and is more easily penetrated by corporate lobyist.

I finally found some cotton rolled duct wrap.

Insulation link

Here is a link that might be useful: insulation link

Hi mlo1, hope you had a nice time with your duct insulation. Now after 8 years, just wanted to check how well did your duct wrap performed over the years. We recently bought a house and have deteriorating fiberglass all around my leaky ducts and so the ducts are pumping the fiberglass onto us. Have been tirelesly trying to find something alternate to fiberglass to wrap my ducts after sealing them, and found your post. Any experience that you share would be highly appreciated.

Alternative insulation.

https://www.air-conditioning-ductless.com/

Fiberglass: Fiberglass is the most common insulation material. It’s made from fine glass fibers and is most often used in batts, rolls and loose-fill insulation. Fiberglass is a skin and lung irritant, so always wear protective eyewear, gloves, masks and clothing when working with fiberglass insulation.

Cellulose: Cellulose insulation is made from recycled paper products. Manufacturers also add borate for fire and insect resistance. Cellulose insulation is usually a loose-fill insulation.

Foam: Foam insulation may be made from polystyrene, polyisocyanurate or polyurethane, which are all types of plastic. You can also install cementitious foam insulation, which is cement-based. Foam insulations can be sprayed or installed in rigid foamboards.

Mineral wool: Mineral wool can refer to either rock wool or slag wool. Rock wool is a man-made material made from a combination of natural minerals. Slag wool is also a man-made material but is made from a waste product of molten metal known as slag. Both mineral wool insulations are naturally fire-resistant. They come as batts, rolls and loose-fill.

Natural fibers: Insulation can also be made from various natural materials, including cotton, sheep’s wool, straw and hemp. Typically, these materials are from recycled sources and are treated to be fire, mold and insect resistant.

Denim insulation is made from recycled jeans and post-industrial denim cotton. Denim is non-toxic and non-irritating, making it easy for DIYers to install. It's typically more expensive than fiberglass or other insulation materials.

The most common insulation materials are fiberglass, cellulose and foam. Home insulation types include any of the above materials in the form of loose-fill, batts, rolls, foam board, spray foam and radiant barriers.

Hi. Thanks a lot. I wish I can make that decision. I live in a condominium and I cant use split AC and heating. So this is not serving my purpose. And I cant use spray foam either. So looking for the cotton insulation for ductwork. The company superiorairducts seems not in business anymore. So trying to continue my witch hunt. Any help would be highly appreciated.