Help me identify this sound absorbing material?

AcousticDreams · #1 08-12-2021, 12:46 PM

This last weekend I attended a Traditional Archery event in the mountains that I started over 20 years ago. Loads of fun!

It is a small group of people in two cabins back to back. We do lots of things, Traditional archery, axe throwing, Music Jams, and more.

Often we have a a dedicated building project. One year we built Cajons. And they sound better than any store bought ones I have ever heard.

Think of Boys scouts times ten, for adults who never want to grow up...Yep that is us. This year besides Music, archery, we built shields and defended ourselves against a mini Trebuchet. Oh yeah, and lots of Pranking...lots of pranks-jokes played on each other. We view it as the best weekend of the year. Music Galore.

Anyway...one of the other things that happens at this event is we bring our..left over- unwanted stuff...and give it away to members. Actually, I made up six custom knives and game them to members of the group. It was a contest actually, with...lots of pranking. But in the end you won a knife.

I was given this sound absorbing material from one of my good friends. He says he purchased it in the 90's for his stereo room. He bought two rolls but only needed one.

I have already purchased a premade 4 piece freestanding panels that used 703 corning. But it came precovered, so I do not know what 703 looks like in the raw.

Before I start building more frames for this new material, I want to make sure it will be worth the time and materials to build. After all, lots of changes in 25 years time.

Can you help me Identify this material? Two feet wide by about an 1 & 1/2 fluffed up. Seems to have a bluish tint to grey material interwoven with other fabric like material?

By the way, I am the crazy looking guy with his hat turned sideways holding the Dragon Shield. We made those up their in a day.

rick-slo · #2 08-12-2021, 12:54 PM

Looks like denim insulation.

AcousticDreams · #3 08-12-2021, 01:00 PM

Can you tell me more about demin insulation? Is it worthwhile sound material? How well does it absorb?

rick-slo · #4 08-12-2021, 01:33 PM

Quote:

Originally Posted by Knives&Guitars

Can you tell me more about demin insulation? Is it worthwhile sound material? How well does it absorb?

It's cotton. Should be able to find info online about the properties of that.

Doug Young · #5 08-12-2021, 01:44 PM

Looks like denim/cotton to me as well. I have a bunch of cotton-based panels. The R-ratings are reasonable, tho it depends on how thick, what you do with it, etc

https://www.atsacoustics.com/acoustic-eco-panel.html

https://www.acoustimac.com/acoustic-...on/ecoinsul421

KevWind · #6 08-12-2021, 01:48 PM

Yep like Rick said it's Cotton blue denim probably recycled
It was an eco-friendly alternative to fiberglass insulation and is said to be better than fiberglass batting for sound absorption. Entirely usable but I doubt it's quite as good as 703 for broad band absorption
BTW 703 looks somewhat akin to spray urethane foam.