Black speckled styrofoam?

[heljis]

Hi,

the wife was just out shopping for styrofoam, regular white polystyrene. The sheets she brought home were white as usual, but some of the "cells" were black. What is this? I'm wondering if it could be some kind of anti-mold agent.. Does anyone know? Google didn't!

Martin

 

[vanpire]

Do you have a picture???

 

[Pärran]

I got the idea that it is residues from the manufacturing process when the manufacturer has run graphite slabs. These are black, after all.
I had some packages with black cells myself when I made my house foundation.

 

[b8q]

I got the idea that it's remnants from the manufacturing when the manufacturer has run graphite sheets. These are black.
I myself had some packs with black cells when I made my house foundation.

That's my guess as well. "May contain traces of graphite", type.

 

[heljis]

Nothing toxic then? I'm planning to have it in the aquarium

 

[KnockOnWood]

Nothing toxic then? Because I'm going to have it in the aquarium

Interesting!

How do you keep the styrofoam from floating?

 

[heljis]

Interesting!

How do you prevent the styrofoam from floating up?

There are several uses I usually place 1cm of styrofoam at the bottom to prevent sand from getting under a stone and creating high pressure on one point of the bottom glass. Then, it's popular to cut the styrofoam to resemble a rock wall or similar, paint with house fix & watercolors, and then lacquer with two-component lacquer to get a nice and realistic background in the aquarium. I'm going to do both within the next few weeks
In the first case, the stone and sand prevent the styrofoam from floating up, in the second case, silicone is the way to go!

 

[eddie_bergh]

Nothing toxic at all. Just go for it!

 

[ronolo]

Give the manufacturer a call and hear.

 

[eddie_bergh]

When we install flat roofs at work, we often get cellular plastic with black cells in it. I've worked with these for twelve years and I know there's absolutely no danger!

 

[Locke]

These are remnants from when they produced other products at the factory. Different products have different colors but are manufactured using the same machines. They purchase the raw material from chemical companies, then they expand the material into beads and press these into large blocks which are then cut with hot wire into sheets. Kind of.