[compost_tea] Re: Mesh & Microns - and poly questions

From: dkemnitz2000 <dkemnitz2000_at_yahoo.com>
Date: Tue, 23 Sep 2003 23:31:07 -0000

---Hello Jeff, What is the particle size distribution on Organic
Gem? Dennis



In compost_tea_at_yahoogroups.com, Jeff Young <sharkman_04101_at_y...>
wrote:
> Group,
>
> Reading this thread has put a smile on my face. I run across this
mesh/micron problem frequently in the vitamin end of my business.
Therefore, I have a conversion chart posted on the wall in my office.
Below are some of the conversions:
>
> Approx. Microns U.S. Seive Market Grade
>
> 403 40 mesh
> 389 40 Mesh
> 297 50 mesh
> 282 50 Mesh
> 250 60 mesh
> 231 60 Mesh
> 177 80 mesh 80 Mesh
> 149 100 mesh 100 Mesh
> 105 140 mesh 150 Mesh
> 74 200 mesh 200 Mesh
> 37 400 mesh 400 Mesh
>
> You can see how the two different styles of screen have different
sized holes at most mesh sizes, especially with the larger openings.
>
> I don't have conversions for sizes smaller than 40 mesh. 40 mesh
is .4 of a millimeter. Larger than that you can almost start to
measure.
>
> Here we use stainless steel screens. They work great and are
durable. I know that you can buy this material in any mesh size you
like, in sheets. If anyone is interested, I can post the places that
sell it.
>
> Kindly,
> Jeff Young
> President
> Advanced Marine Technologies
> 49 Hassey Street
> New Bedford, MA 02740
> Tel: (508) 991-5225
> Fax: (508) 991-3033
> www.organicgem.org
>
>
>
>
> a1l2e3x4ar <xela_at_n...> wrote:
> Kirk:
>
> don't mess with the math of the mesh
>
> the conversion, IMHO, shd be as follows 25,4mm(1") /20mesh =
1.27mm,
> or 1270mc, so that 30mesh can't be 600mc: 25,4/30 = 0.847mm or
847mc.
>
> correct me if I'm wrong, but according to this, those folks worried
> by 3,5mc-fungi not passing thru a 20 mesh (or 30 or 50 for that
> matter) may be at ease
>
> cheers
> alex
> --- In compost_tea_at_yahoogroups.com, "Kirk Leonard" <kirk_at_o...>
wrote:
> > > So Kirk what size screen do you use to filter ACT? Last Friday
I
> > > ordered a #12 mesh for $67. I decided to get the coarsest,
which
> I
> > > thot might not plug the nozzles. I may wish for a #20 soon.
> Dennis
> >
> > So what size holes does this mean? Per Mike's sample table, #12
> seems like
> > maybe 1400 microns*(1.4mm)? Plastic or wire? Must be chunky
> material.
> > Where/who from? Just fabric or a formed/mounted filter? Seems
> sorta
> > "spendy"
> > as we say hereabouts...
> >
> > I don't filter ACT but have friends who use same paint filters
> (which are a
> > buck or two) I described to do that. I've been using two
different
> sizes of
> > paint filters to contain compost during tea making, one with
about
> 1mm X
> > 1/2mm holes, another with holes approx 3/4mm X 1/2mm. Picked up
> some
> > polyester fabric recently with holes that look to be about 3/4mm
> square to
> > make my own filters. None of these have mesh ratings I could
find
> from
> > makers.
> >
> > Blowing all this out of the water, I wonder about polyester
filters
> (all
> > paint filters I've seen are polyester), suspecting they could
> inherently
> > cause fungal hangups. Seems to me the "poly" fibers could fuzz
up
> and
> > tangle hyphae, even bacteria, especially after some use and
wear.
> Judging
> > by discoloration, I think that happens. So I was pleased to
> finally find a
> > monofilament nylon filter the other day - the 600 micron/"about
30
> mesh" I
> > mentioned - thinking it'd be less likely to do that. It's also
> much more
> > substantial material, so should last longer in addition to being
> more
> > cleanable. Might go for an "about 20 mesh" fabric - at my new
> source that's
> > 800 micron openings - myself. Expect it'll cost a good bit more
> than paint
> > filters. Anybody found a good monofilament paint filter out
> there? They
> > seem to be in a good opening size ballpark, whatever the mesh...
> >
> > Are you guys messing with me here? Or meshing?
> >
> > -- Kirk
> >
> > *Another micron measure for those who haven't heard it: An
average
> human
> > hair is said to be 100 microns in diameter. Maybe that's the way
> we should
> > describe this stuff... is it 6 hairs or 12 hairs wide, hmm?
> All "split
> > hair" suggestions also accepted... just trying to get this
> mesh/micron stuff
> > straight.
>
>
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Received on Tue Sep 23 2003 - 20:01:37 EDT

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