Product Manual

5
Abrasive Blasting
Media
Blasting media comes in many different
grit sizes and sometimes also rated as
extra fine, fine, medium, coarse, and
extra coarse. The larger the grit number,
the smaller the particle size; the smaller
the grit number, the larger the particle
size. Glass media can come in beads,
crushed, or ground. Aluminum oxide and
silicon carbide can come in several colors.
It is common today to find mixtures of
glass and aluminum oxide.
Acrylic
Aluminum oxide
Ceramic beads
Corn cob
Garnet
Glass Beads
Glass, crushed
Melamine
Pecan shell
Polyester
Pumice
Sand
Silicon carbide
Sodium Bicarbonate (soda)
Starch
Steel grit
Steel shot
Urea
Walnut shell
Available commercial abrasive blasting media
Abrasive Media - Not
Recommended
Although available, some media are not
recommended for use because of
mechanical and/or personal hazards.
Silica sand, a common blast media, has
health risk concerns due to the silica
content. Restriction on its usage is
common in many states.
Beach sand (play sand) is a common and
inexpensive blast media. This highly
aggressive media can have debris mixed
in which will cause clogging of
equipment.
Steel grit produces ideal surface
preparation on new coating. This media
should only be used in a special blast
cabinet designed for this media.
Steel shot, a round, solid particle, leaves
a dimples in a surface after blasting. It is
a very dense media and should only be
used in a special blast cabinet designed
for this media.
Common Abrasive
Media
The more commonly available media and
their uses are listed below.
Walnut shell is one of the most versatile
organic media due to its angular,
durable shape. It is still considered a soft
media, but it is good to use on delicate
parts. Use as an economical, bio-
degradable alternative for sensitive
blasting that will not scratch or damage
surfaces.
Glass beads are the most popular all-
purpose media used today. Used for
honing, polishing, peening, blending,
finishing, removing light burrs, frosting
glass, and cleaning most light materials.
Common uses in the removal of paint,
rust, and surface residues. Glass bead
blasting generally will not change the
dimensions of the item being blasted.
Glass beads produce brighter finish than
angular abrasives. Beads can be recycled
and used many times.
Crushed glass is very aggressive. Used for
economical, general clean-up.
Plastic is available in a variety of sizes
and materials (urea, acrylic, polyester,
and melamine). These materials are ideal
for application such as auto restoration
to deliver a high stripping rate without
damaging or warping the substrate
material.
Brown aluminum oxide is a widely used
abrasive media. This media produces a
textured surface, good for repairing
surfaces for recoating. It is excellent for
removing heavy foreign materials,
deburring, and etching glass and stone.
It is a fast-cutting media that can be
reused many times.
White aluminum oxide can be used in
the same applications as the brown
aluminum oxide, but white aluminum
oxide is considered to be a clean media,
used in high performance processes
where contamination of metal oxide
must be kept to a minimum.
Aluminum / glass mixtures provides a
combination of glass bead finishing and
aluminum oxide cleaning. It provides a
brighter finish than single abrasives, and
it is good for removing rust and machine
marks on metal.
Silicon carbide is the hardest Abrasive
material available. It is fast cutting and
can be reused many times. It is high in
initial cost, but removes material quickly
to reduce blasting time.
Common abrasive media guide
35-60 Walnut shell Good High Low
25-325 Glass beads Better Low Low
25-70 Crushed glass Better Low Low
30-40 Plastics Better Low High
24-400 Brown alum. oxide Best Low Med -High
150-240 White alum. oxide Best Low High
50-100 Alum./glass mixture Best Low Med
24-240 Silicon carbide Best Low High
Grit Abrasive Abrasive Dust Relative
Range Type Life Level Cost
Consult your abrasive supplier for recommendations.
16 Sp
NOTA: El abrasivo que no ha sido limpiado y tamizado puede contener material que obturará la boquilla de la pistola y no debería usarse.
Use baja presión de aire (4,14 bar o menos) para los metales blandos, vidrio y madera. Use una presión más elevada para aceros duros; no exceda los 8,62 bar.
Perlas de vidrio Cáscara de nuez molida Perlas de vidrio, cáscara de nuez molida Óxido de aluminio Cáscara de pecano o nuez molida y mazorca molida Óxido de aluminio (50-80)
Para grabar vidrio Preparación o meteorización de madera Lijado de madera y acabado de muebles Limpieza de repuestos de automóviles Limpieza o preparación para la pintura Limpieza o raspado de equipo expuesto al intemperie
2,54 cm - 10,16 cm 5,08 cm - 15,24 cm 2,54 cm - 15,24 cm 2,54 cm - 10,16 cm 2,54 cm - 15,24 cm 2,54 cm - 7,62 cm
2,76 - 6,21 2,76 - 6,21 2,76 - 4,83 2,76 - 5,52 2,76 - 8,62 3,45 - 8,62
Mueva la pistola adelante y atrás siguiendo un patrón como si estuviera usando una brocha. Rocíe en un ángulo de 900. Para un brillado fino, use perlas de vidrio como abrasivo. Aplique movimientos como de brocha y observe cuidadosamente la intensidad de la abrasión. La madera blanda se desgasta más rápidamente que la madera dura. El abrasivo de grano pequeño produce un acabado más fino. Empiece con presión baja y auméntela gradualmente. Rocíe en un ángulo de 45
o
.
Aplique movimientos como de brocha y observe cuidadosamente la intensidad de la abrasión. Use cáscara de nuez para un acabado rústico y perlas de vidrio para el acabado final. Rocíe en un ángulo de 45
o
.
Use material abrasivo de grano mayor para las área no a la vista. Si el material de base queda dañado, use un abrasivo de grano menor. Rocíe en un ángulo entre 80 y 90
o
.
Aplique movimientos como de brocha y observe cuidadosamente la intensidad de la abrasión. La madera blanda se desgasta más rápidamente que la madera dura. El abrasivo de grano pequeño produce un acabado más fino. Empiece con presión baja y auméntela gradualmente. Rocíe en un ángulo entre 45 y 60
o
.
Retire la pintura descascarada con un cepillo de alambre, luego rocíe con un abrasivo de grano grueso. Es necesario raspar primero las capas múltiples de pintura vieja. Después de rociar con abrasivo, aplique de inmediato un imprimador para evitar la corrosión. Rocíe en un ángulo entre 45 y 60
o
.
Tipos de Distancia Abrasivo Aplicación de la pieza bar Sugerencias (Cernido/Tamaño) de trabajo
Usos Sugeridos
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