Model G0708 (Mfd. Since 1/15)
-27-
Plastic Beads
Plastic abrasives are available in a variety of
types such as urea, melamine, and acrylic com-
positions. These beads are shaped just as indi-
cated and give reliable and consistent stripping
results. Paints, varnishes, rusts, and oxidation can
be stripped from soft metals, plastics, and wood.
The aerospace and automotive industry are chief
consumers of this blast media.
—Urea (3-4): Considered to be an enviorn-
mentally-friendly choice, urea is the most
commonly used plastic media. It is recy-
clable and is an excellent choice for strip-
ping tough coatings when speed is a high
priority and the surface is not critical.
—Melamine (3-4): Also a long-lasting recy-
clable media, this abrasive is the most
aggressive in the family of the plastic
beads. Due to its hardness, it can strip
hard-to-remove coatings and be the sub-
stitute for some of the other types of glass
beads.
—Acrylic (3-4): This is a multipurpose blast
media that is one of the longest lasting
types available. It is often used for strip-
ping sensitive surfaces or delicate parts
that may consist of multiple types of com-
pounds. It is available in a wide range of
grit sizes.
Soft Blast Media
There are many types of "Soft" blast media, many
of which are minerals, inert, and organic. Some
blast cabinets with dust collection systems require
special filters or dust collectors for soft types of
media. For the Model G0708, filter cleaning inter-
val will have to be increased to maintain flow.
—Ground Walnut: (4.5-5) This is a soft
media that is produced from crushed or
ground walnut shells. The structure is
multi-faceted and angular with no free
silica in the media. Durability is excellent,
and this media is a good choice for blast-
ing operations where the paint, varnish, or
coating must be cleaned but not marred or
removed. Hardwoods, jewelry, and elec-
trical items can also be cleaned with this
media. Using a larger grit under higher
pressure settings, paint and varnishes, and
engine parts can be cleaned of coke and
carbon deposits.
—Pumice (6-7): This media is the softest
media available and is a natural volcanic
ash that is an inert mineral. Pumice can be
used for the most sensitive blasting opera-
tions where the painted or finished surface
must be entirely unaffected by the removal
of the foreign matter. The structure is
block-shaped and is honeycombed.
—Ground Corn Cob (4.5): Is an organic,
soft blasting grit that has an angular shape.
It has excellent surface cleaning behavior
that is similar to ground walnut and peanut
shells. Corn cob media is commonly used
to strip bark off of wood, light coatings,
and dirt without surface damage or grain
blowout. It is available in a selection of grit
sizes.
—Sodium Bicarbonate (2.4): Baking soda is
inert and has an excellent ability to remove
and absorb the dirt or contaminants from a
surface. It will not peen or cut the underly-
ing workpiece. This important media can
be used where small ports and bores must
be cleaned without the hazard of clogging
the passages. The workpiece and its pas-
sages can be cleaned with water as this
blast media is water soluble.
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