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Topic: synthetic-fiber cloth for AP filters, was +Proper measures for the Aeropress? (8 msgs / 175 lines)
1) From: Brian Kamnetz
My sister may give me an AP for Christmas. People on the list have
discussed using what sounded to me like synthetic-fiber cloth for AP
filters, but I couldn't understand what exactly the material was. If I
were to go to a sewing material store (do these still exist?) looking
for some of that material, what exactly would I ask for? And, would I
name the generic material, and also the "weight"?
Thanks for the help!
Brian
On Dec 16, 2007 10:56 PM, Justin Marquez  wrote:
<Snip>

2) From: Dave Huddle
Scott   scott.marquardt   is the fellow who gave out some
synthetic cloth stuff to use in the AP,    I haven't seen him on the
list for a while.
On 12/17/07, Brian Kamnetz  wrote:
<Snip>

3) From: MichaelB
Brian,
McMaster Carr has the material: Polyester Filter Felt - Ideal for very fine
filtering of water, organic solvents, organic acids, petroleum oils, weak
alkalies, and mineral acids. Sold in individually packaged sheets for
convenience. Max. temperature is 300  F. Color is white.
    12" x 12"  36" x 36"
Micron    Sheets  Sheets
Rating  Thick.  Each  Each
50 0.080" 6376T15 1.26
 6376T35 9.34
Scott found the 50 micron filters best. Not sure if he had a different
supplier - you definitely want to get food grade material. There may be mor=
e
information about this on coffeegeek dot com. The inventor hangs out there
and answers any and all questions.
BTW, if you use the polyester you will have to file down the bayonet mounts
on the aeropress filter holder; the material is much thicker than the paper
filters supplied with the device.
On Dec 17, 2007 10:29 AM, Brian Kamnetz  wrote:
<Snip>
--
MichaelB

4) From: Brian Kamnetz
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5) From: Scott Marquardt
Aack!
5.
50 is actually closer to a Clover (I believe the finest possible filter for
a Clover is still 40).
The advantage of the polyester is that its non-woven felt construction makes
for a very different filtering dynamic; throughput is very fast, relative to
paper or metal.
I could say a lot, but I'll add this: Ideally, use inversion or some other
method that avoids contact of immediately-wetted grind with the material. My
unproven belief is that letting the grind wet for at least several seconds
before contacting the material will allow fewer particles to penetrate to
depth in the felt (the finer particles swell most quickly when wetted),
assisting the cleaning process.
- S
On Dec 17, 2007 12:41 PM, MichaelB  wrote:
<Snip>

6) From: raymanowen
Have a look at: 
A porcelain filter gets into the sub-micron pass region, and I question the
use of [Good, Better, and More Better] filters for coffee.
Membrane technology [you're labeled as non-technical if you call them
Membrane Filters] would output pure water if you put in a great shot of
espresso!
Cheers, Mabuhay -RayO, aka Opa!
Enough, already!
On Dec 17, 2007 12:59 PM, Scott Marquardt  wrote:
<Snip>

7) From: MichaelB
Scott,
Sorry about that. Glad you jumped in to correct it.
On Dec 17, 2007 2:59 PM, Scott Marquardt  wrote:
<Snip>
--
MichaelB

8) From: Scott Marquardt
Cotton or hemp filters are likely to work better, IMO, with the very uniform
grind one finds in the commercial cans. Heck, they work better for paper
too.
I'll be doctrinaire and assert on the strength of little more than an
informed intuition that felts will almost always be a superior filtering
medium for coffee originating with a heterogeneous grind.
Having said that, cleaning 'em is pure hell for those who prefer
convenience.
On Dec 17, 2007 4:40 PM,  wrote:
<Snip>


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