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View Full Version : Perlite...Is it reef Safe?


Neptune777
06/25/2007, 05:40 AM
I am looking to make live rock and want to use perlite as an aggregate since it is very porous and cheap. Is it reef safe or will it leach anything bad into the water?

Billybeau1
06/25/2007, 09:34 AM
Since perlite is a form of natural glass, it is classified as chemically inert and has a pH of approximately 7.

TYPICAL ELEMENTAL ANALYSIS

Silica (SiO²)
Aluminum
Potassium Oxide
Sodium Oxide
Iron
Calcium Oxide
Magnesium Oxide
Loss On Ignition
pH (10% solution)



69%
18.4
2.9
3.2
.7
1.8
.9
1.27%
7.37%


TYPICAL PHYSICAL PROPERTIES

Color
Refractive Index
pH (of water slurry)
Specific Gravity
Softening Point
Fusion Point
Specific Heat



White
1.5
6.5 - 8.0
2.1 - 2.5
1350 - 2000ºF
2250 - 2500ºF
.2

I am not a chemist, but I would be concerned about the aluminum.

I would say, after reading an article about what is perlite, no, I would not use it in a reef aquarium. :)

Icefire
06/25/2007, 10:16 AM
I tryed to make DIY rock with it. you need massive amount.

scarter
06/25/2007, 10:46 AM
some people have been using it for DIY rock (I have not), so far nobody has mentioned any adverse effects to my knowledge

bertoni
06/25/2007, 11:53 AM
I might worry about the aluminum as well.

Neptune777
06/25/2007, 01:10 PM
It's actually Al203, which is also in aquarium glass but at a much lower % from what I have read. I don't think it contains "free" aluminum.....but that is why I need a chemist to answer the question for me.

Neptune777
06/25/2007, 01:13 PM
<a href=showthread.php?s=&postid=10210466#post10210466 target=_blank>Originally posted</a> by Icefire
I tryed to make DIY rock with it. you need massive amount.

Not sure why you need a massive amount? In theory you shouldn't need more than any other aggregate. Not to mention I can get an 8 cu foot bag for $18 (that's a bunch of perlite!).

I made a single rock the other day with quikwall and perlite and it went together very easily, not waht I would consider a huge amount used.

Maybe I misunderstood, can you clarify?

Neptune777
06/25/2007, 01:16 PM
[i]

I am not a chemist, but I would be concerned about the aluminum.

I would say, after reading an article about what is perlite, no, I would not use it in a reef aquarium. :) [/B]


Please elaborate on your last sentence. I've been reading lots on the stuff and how it is formed and it's composition. Nothing stood out to me as a big red flag (The only concern I have is the Al203 content)....Just curious