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Media: Corncob and Corn Cob Blasting
Media: Corncob and Corn Cob Blasting
Standard
Grades Used: 10/14, 14/20, 20/40 and
40/60
Overview:
Vibratory finishing and tumbling are mass finishing processes where the
abrasive and absorbent characteristics are generally both desirable. Corncob and corn cob blasting
grit polishes and deburs parts and at the same time cleans and dries parts.
Oils and other liquids from wet mass finishing processes are absorbed.
Grade selection is typically based upon the finished surface profile desired
and the diameter of any holes or cavities in the part. The selected grade
should not contain particles that would lodge in part openings.
Grit blasting
with corncob and corn cob blasting particles is accomplished with the same equipment as used for
sand blasting. Because corncob and corn cob blasting grit is considerably less aggressive than
sand, it is often categorized as a "soft abrasive" (corncob and corn cob blasting grit has a 4.5
Mohs hardness). corncob and corn cob blasting grit does not etch glass or foul bearings and is
frequently used to clean electric motors and machinery with hydraulic
cylinders. Other applications include: smoke damage and residue clean-up;
mold cleaning; plant maintenance; and loose and flaking paint removal. It is
ideal for wood, aluminum and fiberglass substrates.
Unlike mass
finishing processes, blasting with corncob and corn cob blasting grit is not as predictable. Each
job tends to have unique characteristics which do not allow for estimating
precise media usage or outcomes. We recommend testing a couple of grades to
determine which offers the best performance. We will box and ship 40-pound
bags anywhere in the USA for $40.00 per bag.
Remember to
flush any other media from your equipment before performing the test.
First, why crushed corncob and corn cob blastings?
Well it seems it will clean wood without really removing or damaging the
wood. The ground up cob is just about equal in hardness to most of the softwoods
typically used in log cabin building. On the
MOHS hardness scale both
range between 2 and 4.5 (big difference due to so many different types). It
does a good job and the waste can just be left on the ground to disintegrate -
it helps, not hurts the environment. For you fully naturalist log cabin owners
you can put it in your compost pile! That is assuming you did not paint your
cabin with a lead base paint. The most often recommended size for blasting a
log cabin is our 40/60 grit.
What's it going to cost me?
$25 (US) per 40 pound bag of 40/60 corncob and corn cob blasting grit, plus packaging and freight
from Portland, OR 97267 Plus the cost of renting a blast pot and compressor.
The freight cost will vary depending on where you are and how much you need.
You might be looking at $10 to $20 or more per bag. If you require less then 5
bags you might find that UPS is
a good method. You can find out how to get a price from UPS on the internet by
clicking here. Bags of corncob and corn cob blasting grit are ?
x ? x ? and weigh 40 pounds each. When shipping via UPS we wrap each brown
paper bag in shrink wrap to protect it, you need to add $5.00 per bag for this -
we do not put it in boxes. If you want more than 5 bags then putting it on
a pallet and shrink wrapping the whole thing, then shipping via commercial
freight carrier is the way to go. We charge the $25 per bag plus $5 for a
disposable wood pallet and another $5 to shrink wrap each pallet. You do
not pay the $5 per bag packaging fee when shipped on a pallet. We normally
place up to 50 bags on a pallet.
Top
How much will I need?
Now that is the big question, no one seems to really agree and the reason is
that the variables are many. The amount you need will range from 2 pounds per
square foot to 10 pounds or more per square foot. It depends on what you have
to clean off, the size of the nozzle and blasting hose, the air pressure and
volume of air. For a normal cleaning to remove mold,
light paint or weather stain I suggest that you start with about 4 to 5 pounds
per square foot (one bag for every 200 sq ft) of blasting area and go from
there.
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Crushed corncob and corn cob blastings are made from the woody ring portion of the corncob.
This portion of the cob is separated, dried, ground, air-cleaned, and then
classified over screens of various mesh sizes. They are available in
granules ranging from 1/4” to a fine powder.
Qualities of crushed corncob and corn cob blastings that make them ideal for pressure blasting
include its mild abrasiveness, absorbency, and resilience to attrition.
Advantages of using corncob and corn cob blastings for blasting include the elimination of
masking, elimination of solvents and pollution concerns, non-sparking and
non-toxic operation, non-silica content, and the fact that it is organic and
biodegradable. |
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Common applications of corncob and corn cob blasting include:
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cleaning of motors, generators, and heavy equipment
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cleaning of insulators and transformers
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removal of manufacturing soils from the ceiling of industrial
facilities
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cleaning of pipes and pumps in processing plants
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cleaning and paint preparation of buildings
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cleaning of timbers in log homes prior to sealing
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cleaning of boat hulls
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Crushed corncob and corn cob blastings have a 4.5 Mohs hardness and are available in the
following standard sizes: |
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Size |
Passes through: |
Retained on: |
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814 |
#8 (.0937”) |
#14 (.0555”) |
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1420 |
#14 (.0555”) |
#20 (.0331”) |
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2040 |
#20 (.0331”) |
#40 (.0165”) |
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4060 |
#40 (.0165”) |
#60 (.0098”) |
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