Replies

1. 
   stk | Dec 12, 2016 10:17am | #1

   The Isolite brand product is made by Thermoguard Insulation Company in Spokane, WA. It uses approx. 25% polyborate by weight. No other types of boric or borate used, just the polyborate. The contractor normally uses Greenfiber (with sulfate). Contractor did not propose using one of the Greenfiber products without sulfate. I am concerned that Thermoguard/Isolite is a lesser quality "Brand X."

2. 
   Jon_R | Dec 12, 2016 11:21am | #2

   Everything I've seen indicates that boric acid and sodium borate are very similar.

3. 
   charlie_sullivan | Dec 12, 2016 11:48am | #3

   I think the standard recommendation is that any kind of borate is fine, and that ammonium sulfate is the one that is undesirable. But perhaps someone who knows more chemistry will help us understand better.

4. 
   stk | Dec 12, 2016 12:22pm | #4

   I get the impression that there are many cellulose companies that sell primarily to contractors. so don't focus on "brand" like National Fiber, US Green Fiber, etc. I am looking for a borate-only product, which I learned about on this website. Now the question is if all non-borate cellulose is about the same (i.e. a commodity product) or if there actually are quality differences between manufacturers. Thermoguard is owned by Service Partners, which is a national building products firm. Says they have been in business in Spokane since 1951.

5. 
   stk | Dec 12, 2016 12:23pm | #5

   Sorry, I meant borate-only, not "non-borate."

6. 
   finePNW | Nov 15, 2023 06:53pm | #6

   It seems Greenfiber Sanctuary (and not its Sound Barrier product) is ammonium sulfate free -- or at least it's not listed in the SDS. Instead, perhaps, it seems they may use Calcium Sulfate Dihydrate. Anyone know a) if this is correct and b) if this poses the same corrosion concerns?