Fiberglass building insulation.

I got another laugh. Sorry. Hoping HCB66 is taking notes. A good year '66. A bad year soaking glass insulation in resins. It is really a dangerous concept. I am sorry you found out the hard way.

I've had a pail or two with 8 ounces at the end of a big job get forgotten. They started smokin and burned a mark into my vac table. Even that is scary for me. Add oxygen in the void spaces of insulation; quite a formula for fire.

Thanks for sharing. I did a couple large fills and I purposely used corecell M grindings...hoping they would do better with the heating. Bigger particles; perhaps less epoxy per unit volume..

 

If you live anywhere near a composites fabricator you can typically get glass free.

They cut glass to shape and have lots of scraps, they pay to have it hauled away. Anything they can give away saves them money.

 

Here's an article about using epoxy resin over foam, you might find interesting.
Tech Question: “Can I apply resin to foam?” https://blog-fgci.com/2016/10/14/tech-question-can-i-apply-resin-to-foam/
Polyurethane foam sounds like it would work best.

Fiberglass insulation is held together with a coating of oils and resin that may not be compatible with epoxy. It seems there have been plenty of people asking this same question, but I have found no one posting about actually trying it except Blueknarr. Bad luck there.

-Will (Dragonfly)

 

Tech Question: “Can I apply resin to foam?” https://blog-fgci.com/2016/10/14/tech-question-can-i-apply-resin-to-foam/
"With Polystyrene or Styrofoam, you can’t directly apply Polyester or Epoxy directly to Styrofoam, as it will melt the foam."
This is a lie. Epoxy has no problem with both.
Perhaps the author is confused. Esters cannot be applied to these foams

 

While epoxy won't immediately dissolve the foams like the esters will. Epoxy can generate sufficient heat to melt those foams

 

I'll take your word for it Mr. Orr. But anything will burn if you light it on fire.

Virtually every surfboard is epoxy over Styrene. All of Rutans planes are too. Epoxy is kinda famous as working well over Styrene foam, unlike esters.

It's a lie.

 

I certainly don't have the experience to refute you. I believe you, in fact. The article, however, suggested some products be used to protect the styrofoam before coating in epoxy. It only says not to apply directly to bare styrofoam, not that the two were completely incompatible.

-Will (Dragonfly)

 

A thin surface film of epoxy or saturated lightweight fabric on styrofoam is all well and good.

Try filling a void with epoxy. Before saying that epoxy melting styrofoam is a lie.

Epoxy on styrofoam is possible but care must be taken.

 

I wont argue this any more.
There is exactly no problems putting epoxy on polystyrene. This is entirely different than putting any ester like resin on polystyrene, which will chemically destroy the polystyrene. Epoxy will not, in any way, chemically destroy your polystyrene.

If your epoxy is on fire, then I am not sure there exists a foam you can put it on and expect a happy ending.

 

people are right in many ways here; we have dual paths of communications

you have to realize epoxy can go on styrofoam, but if it gets too warm; it will melt the foam, but certainly not when just laminating thin glass; the article is technically incorrect

but we were talking about high exotherms using glass insulation as a potential core

 

I'll take it. Well done

 

We called it angel hair back in the '50's.