The correct choice of abrasive

Overview faced due to blasting construction productivity and environmental stakes so well-known characteristics of abrasive blasting has become in today's business

environment to survive and maintain a competitive advantage specific demands. Introduction sandblasted surface is re-established protective paint systems

To step. Over the years many tests concluded: providing stability in blast cleaning the surface of the anchor-like appearance of the coating application can get the

corrosion resistance and high durability. In order to obtain the proper surface roughness must select the appropriate requirements engineering polish

abrasive grinding . In some cases, because the sand will damage the surface residues of the degree of cleaning, polishing must consider not strong blasting particles. Today's

business environment for quality assurance and environmental requirements are very strict, so familiar with the characteristics of the abrasive blasting is critical.

Unlucky

There is no one kind of blasting abrasives suitable for all construction work, fortunately, there are many different types and grades of abrasive, to ensure the

project is completed. Learning the characteristics of each type of abrasive can help you choose the more efficient and interests of abrasive blasting.
When selecting the desired abrasive, it must take into account the characteristics of each. These include abrasive hardness, shape, size, color, weight, chemical

composition, availability, cost, and environmental factors, to choose the best according to each item.
Hardness The hardness of the abrasive particles determines the ability to form etching or sandblasting the surface of the substrate to form a specific anchor-like

appearance. Determine abrasive method is Mohs hardness scale hardness. The scale ranges from 1 to 10, 1 being the most flexible (Mica) 10 represents one of the hardest

(

Diamond). Generally reach anchor-like appearance sandblasting pellets hardness was 6.0 or higher. But there are some requirements in the range 3.0 to 4.5 using soft

pellets, these pellets were not etched glass or steel surface, but will remove foreign soil, provides surface

Cleanliness, mainly for the substrate surface do not want to damage or sand blasting particles or residues be damage to the environment surrounding the area. Soft sand

pellets usually used around the bearing or other vulnerable machines range. Hard abrasive grit and steel shot is with Rockwell

C notation hardness. Hardness in the range between 42-65. Etching the surface of the steel grit and steel shot in the steel surface dents.
Shape The shape of the abrasive is not the same, there is angular, massive, semi-circular shape or spherical. There are sharp edges on the substrate in clearing

angular abrasive substances or dirt adhering closely to clean the highest rate. A sharp edge angular abrasive surface of the steel can anchor-like appearance of the

paint

The attachment provides excellent mechanical properties. In addition to very difficult to remove the dirt, the bulk abrasive cleaning can guarantee a good rate.

Abrasives or semi-spherical indentation in the surface, which is mainly used to increase the surface hardness of the abrasive.
The size of the clean abrasive size and the rate of formation of anchor-like appearance. Sieving through the United States or particle diameter size of France decided

to differentiate tablets
Abrasive grinding generally divided into four sieve to 325 sieve, the smaller the size, the larger abrasive particles. 8-16 grade pellets is very rough, mainly for difficult

cleaning or need deeper anchor-like appearance of the surface; 20-40 level for general purposes; 80-120 grade for polishing metal surfaces.

Round or spherical sand particle diameter pellets to distinguish through the grades, the size range between 0.070 -0.660 feet. Uniform level to ensure that the size of

the abrasive blasting machine through accurate flow measuring valves, uniform level of grit in order to protect the base

Stable metal surface roughness.
If you consider is color selection abrasive type, color is not very important, but in some cases also a key factor. After blasting the surface of the residue will

affect the appearance. Black abrasive because of the difficulty reflected sunlight, less dust than light, interior lighting is needed

This is especially when blasting area important. If in a confined area or areas for maintenance construction, easy to completely remove the abrasive from the aesthetic

point of view is very important to choose the color of abrasive.
Weight or gravity will affect the weight of the abrasive surface cleanliness and surface roughness. By the weight in pounds / cubic foot, said referring to the

proportion of the particle density than the major means heavy weight. The same pressure conditions, heavy pellets made deeper anchor-like appearance. Ratio

Significant less abrasive dust generated, light weight pellets impact the substrate is small, mainly used for light sandblasting or polishing to remove burrs. Chemical

composition in order to ensure the compatibility with the substrate, the chemical composition of the abrasive must be considered. When blasting, the spray sand

Child will be embedded in the substrate or leave residues, will be on the protective coating system damage. If the stainless steel substrate using iron blasting

particles embedded corrosion electrode formed on the substrate. Availability must ensure that the chosen blasting particles have sufficient supply

, Easy access, to ensure the successful completion of the project. To ensure the best engineering results, not recommended way to replace the abrasive. Many abrasive

is a natural byproduct of ores or other industries, is not easy to ensure timely delivery of large quantities.
Cost Cost is abrasive key factor in the project. Generally speaking, by the supplier to the construction site from the freight decide abrasive choice. Abrasive damage

rate is also important. Cupboards or by sandblasting sand recovery system between the full re-use, reducing the high recycling

Rate abrasive costs. Blasting pressure recirculation rate, hardness, ductility, and determined by the size of abrasive.
Environmental impact on the environment is to determine the final choice of abrasive elements. Include: sandblasting workers respiration. Workers in the sandblasting

process must use respiratory equipment, and monitor the entire blasting process. When the blasting area with poor ventilation, you must use the correct dust

Soil recycling equipment to reduce workers face the dust. It should also be taken into account abrasive dispersed into the soil, enclosed area should be considered

toxic paint additional safety and engineering control measures. Abrasive
    Abrasive directories listed below is just normally use abrasives, not all, the purpose to provide readers with more information, and to arouse the reader's

curiosity looking around for suitable abrasive. Familiar with the performance characteristics of each type of abrasive to ensure the success of the project to provide

good

Good start.
Silica abrasive silica sand is an inexpensive, in many countries, many places you can get. Ores relatively sharp, more rounded sand. Mohs hardness of 6-7, can be

formed on the surface of the substrate etching or anchor-like appearance, a variety of sizes, brown or tan, can pass

Over recycling use, containing 95% -99% silica (SiO2). Because of the danger of silicosis, you must take special sandblasting process control. U.S. Occupational Safety

and Health National Business Association (NIOSH) recommended standard PB-246-697 Part 6 point 2 a

Description: "no silicon controlled blasting will cause silicosis hazard, special attention must. Silica sand or other materials containing more than 1% free silica,

must be prohibited as abrasive blasting process used in the blast." And further that: "The most effective and direct exclusion silicosis

Disease risk approach is replaced with a material of low toxicity free silicon, sandblasting process should consider the silicon content of less than 1% of free

alternatives. "
The utility industry slag by-product slag, massive, free silica content of less than 1%. Mohs hardness of 6, is formed on the substrate surface can be etched, or

anchor-like appearance, with green glossy black, a variety of sizes, mainly composed of silicon oxide, aluminum oxide and iron oxide

Composition, can be recycled several times, but generally one-time use, is inexpensive abrasive. Copper Copper is copper slag slag industrial by-products, block, free

silica content of less than 1%, Mohs hardness of 6, is formed on the substrate surface can be etched, or anchor-like appearance, due to

Proportion of embedded substrate Assembly, black with gray gloss, available in various sizes, are inexpensive abrasive.
Nickel Nickel slag slag are by-products, block, free silica content of less than 1%, Mohs hardness of 6, is formed on the substrate surface can be etched, or anchor-

like appearance, a variety of sizes, can be recycled many times, but generally one-time use, is a low abrasive.
Cross Stone Cross Stone is a natural mineral, cusp-like, free silica content of less than 1% of alumina and iron oxide, Mohs hardness of 7, can be formed on the

surface of the substrate etching or anchor-like appearance, can be recycled many times use, but for outdoor and sandblasting cabinet and there is back

Closing occasionally blasting systems use only once, with moderate and small size. Ceramic Ceramic is specialized in producing abrasive, cusp-shaped, free silica

content of less than 1%, was dark brown / gray, Mohs hardness of 7, a variety of sizes, to the substrate surface erosion

Engraved or anchor-like appearance, can be repeatedly recycled.
Peridot Peridot is a natural mineral, cusp-like, free silica content of less than 1%, Mohs hardness of 6.5, can be formed on the surface of the substrate etching or

anchor-like appearance, pale green, there are a variety of sizes, the main ingredient is silicon oxide, magnesium oxide, iron oxide, can be more

Times recycling use, but for outdoor blasting and sandblasting cabinet and a recovery system can only be used between blasting off.
Zircon is a natural mineral zircon, cusp-shaped, free silica content of less than 1%, the Moh hardness of 6.5, formed on the surface of the substrate can be etched, or

anchor-like appearance, consisting of zirconium silicon, brown, its rapid cutting, mainly in the blasting cabinet and a recovery system sandblasting

Occasional use.
Alumina ceramics are specialized in manufacturing abrasive, cusp-like, free silica content of less than 1%, black, Mohs hardness of 8, a variety of sizes, the surface

of the substrate can be etched, or anchor-like appearance, can be repeated Recycling, because of fast cutting, low dust, high

Costs, mainly in the blasting cabinet and a recovery system used in sandblasting room.
Is specialized in producing glass beads ceramic abrasive, spherical, free silica content of less than 1%, white, Mohs hardness of 6, a variety of sizes, may be formed

on the surface pits can be recycled many times, because of its fast and clean mainly in the blast cabinet and cost recovery system has

Using conventional sandblasting room, used to increase surface hardness and deburring.
Garnet Garnet is a natural mineral, cusp-shaped, free silica content of less than 1% red, Mohs hardness of 7.5, a variety of sizes, the surface of the substrate can be

etched, or anchor-like appearance, can be recycled many times , because of its fast cutting, low dust, high costs

This, mainly in the blasting cabinet and a recovery system used in sandblasting room.
Specializing in the production of silicon carbide SiC abrasive, cusp-shaped, free silica content of less than 1% black, the Mohs hardness of 8.5, a variety of sizes,

the surface of the substrate can be etched, or anchor-like appearance, can be more secondary recovery, because fast cutting, low dust

High costs, mainly in the blasting cabinet and a recovery system used in sandblasting room.
Walnut shell walnut shells are agricultural products, block, free silica content of less than 1%, Mohs hardness of 3, no etching of the substrate surface, black, a

variety of sizes, for deburring, cleaning electrical components, precision thread or bearing the surrounding area. Jade

Corn cob cob grain rice grain agricultural products, block, free silica content of less than 1%, Mohs hardness of 4.5, no etching of the substrate surface, black, a

variety of sizes, for cleaning electrical components , aluminum mold, precision thread or bearing the surrounding area

Domains. Specializing in the production of plastic particles in the plastic abrasive particles, blocks, free silica content of less than 1%, Mohs hardness of 3-4, the

plastic particles are soft, no etching of the substrate surface, because of the high cost, mainly in the spray cabinet and sand blasting rooms have recycling systems

Used for cleaning the mold, thread and precision equipment area. Shot Shot specialized in manufacturing abrasive, spherical, free silica content of less than 1% of the

iron oxide component, Rockwell C hardness of 42-50, to the formation of dents on the surface, the number of recycling

Up to 100 times or more, the use of low cost, mainly used for rotating wheel blasting machine, also for other metals to provide surface hardness. Grit abrasive grit is

specialized in producing, cusp-like, less than 1% free silica content, composition is iron oxide, Rockwell C hardness of 42-62

, Recycling up to 100 times more than the frequency of use, low cost, mainly in the blasting cabinet and a recovery system used in blasting rooms can also be mixed

with steel shot, by rotating the wheel blast machine to achieve special anchor-like appearance. This paper summarizes the total abrasive blasting views

Purpose is to inspire readers to describe consciously find more suitable project is completed around the abrasive. This article describes the various abrasive has its

advantages and disadvantages, and is currently on the market there are more good performance abrasives. To win in the competition, cost-effectively complete the

project

Must be familiar with each of the abrasive. Select the appropriate abrasive, costs and productivity are important, but environmental considerations are also essential.