We need a method of suspending powder in a chamber 1 cubic meter in
volume.

What is the best system? I was thinking of having the base-plate of
the chamber covered with holes through which air flows, thus keeping
the powder in suspension.

The powder is talc., we are using the chamber to test equipment to
IP5x standard.

We have access to compressed air, electricity etc.

We need a method of suspending powder in a chamber 1 cubic meter in
volume.

What is the best system? I was thinking of having the base-plate of
the chamber covered with holes through which air flows, thus keeping
the powder in suspension.

The powder is talc., we are using the chamber to test equipment to
IP5x standard.

We have access to compressed air, electricity etc.
Do you need to keep the powder dry? or can you suspend it in a fluid?

There are also other additives used for powders which can it's
performance in a fluidized bed.

"Abdullah Eyles" <agulesin@hotmail.com> wrote in message
news:62155ce7.0308150551.3d2d3b97@posting.google.com...
We need a method of suspending powder in a chamber 1 cubic meter in
volume.

What is the best system? I was thinking of having the base-plate of
the chamber covered with holes through which air flows, thus keeping
the powder in suspension.

The powder is talc., we are using the chamber to test equipment to
IP5x standard.

We have access to compressed air, electricity etc.
Do you need to keep the powder dry? or can you suspend it in a fluid?
If you plan on using a fluidized bed (your plate with holes drilled in
it) -
There are porous plastics and ceramics typically used for fluidized bed
membranes. If you can coat the Talc with a silane (this is very easy to
o) - the Talc will hold an electrostatic charge and will be easier to
fluidize.
There are also other additives used for powders which can it's performance
in a fluidized bed.
I have head stories of people getting Zapped from the electrostatic charge
buildup in fluidized beds so be careful and keep everything grounded.
- If your interested I can provide some limited information on specific
additives, vendors etc.
Good luck!
Gregg

IP5x is tested according to a standard, and this standard does not allow for
a talc suspended in a fluidized bed. The talc should be moved by a
circulating air stream.

"Bob" <robert.desmet@planetinternet.be> wrote in message
news:<bhr8bg$kft$1@reader10.wxs.nl>...
IP5x is tested according to a standard, and this standard does not allow
for
a talc suspended in a fluidized bed. The talc should be moved by a
circulating air stream.


Thanks for the news, Bob. I am glad we found that out before too late!

Now another question: can we transport the talc using an air-stream
generated by compressed air? Through a venturi, I imagine...

I don't want to pass the talc through a fan because it cakes up on the
blades and doesn't do the fan a lot of good...

TIA