Glass beads are very widely used in the impact treatment of surfaces. Their spherical shape and physico-chemical nature endow them with a variety of properties that no other surface treatment agent has, combined.
There are shaped like perfect spheres with a smooth, shining surface. Their density is approximately 2.5. They are available in successive granulometric ranges of 1 to 1000 microns. During projection, each glass bead acts like a small hammer on the surface of the part to be treated.
When surfaces are treated with Glass Beads, this is done under optimal conditions of efficiency, cleanliness, speed, safety and the comfort of the users.
Glass beads are used in all types of compressed air impact treatment machines, using a dry or wet process.
Glass bead treatment may be the only surface treatment or it may supplement a treatment, for instance using corundum, in order to obtain a much lower level of roughness.
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Chemical Composition
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Physical Properties |
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SiO² |
70 à 75 % |
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Na2O |
12 à 15 % |
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K2O |
< 1,5 % |
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CaO |
7 à 12 % |
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MgO |
< 5 % |
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Fe2O3 |
< 0,5 % |
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Al2O3 |
< 2,5 % |
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SO3 |
< 0,5 % |
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FREE SILICA : 0 |
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Softening Point |
730 oC |
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Annealing Point |
550 oC |
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Absolute Specific Weight |
2.46 |
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Refraction Index |
1.51 ~ 1.52 |
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Apparent Density |
1.50 ~ 1.60 |
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Moh’s Hardness |
6 |
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Rockwell Hardness |
47 Rc |
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Knoop Hardness (100 gr. Load) |
515 Kg/mm2 |
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Specifications
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Type |
Micron |
Standard Measured on ASTM E11-70 Sleve
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|
BL |
425 ~ 850 |
Passing |
1000µm |
99 to 100 % |
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850µm |
90 to 100 % |
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425µm |
0 to 10 % |
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C |
250 ~ 425 |
Passing |
500µm |
99 to 100 % |
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425µm |
90 to 100 % |
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250µm |
0 to 10 % |
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AB |
180 ~ 300 |
Passing |
355µm |
99 to 100 % |
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300µm |
90 to 100 % |
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180µm |
0 to 10 % |
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AC |
150 ~ 250 |
Passing |
300µm |
99 to 100 % |
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250µm |
90 to 100 % |
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150µm |
0 to 10 % |
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AD |
106 ~ 212 |
Passing |
250µm |
99 to 100 % |
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212µm |
90 to 100 % |
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106µm |
0 to 10 % |
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AF |
75 ~ 150 |
Passing |
180µm |
99 to 100 % |
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150µm |
90 to 100 % |
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75µm |
0 to 10 % |
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AG |
53 ~ 106 |
Passing |
125µm |
99 to 100 % |
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106µm |
90 to 100 % |
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53µm |
0 to 10 % |
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AH |
45 ~ 90 |
Passing |
106µm |
99 to 100 % |
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90µm |
90 to 100 % |
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45µm |
0 to 10 % |
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AQ |
45 and less |
Passing |
90µm |
99 to 100 % |
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63µm |
90 to 100 % |
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45µm |
0 to 10 % |
Other sizes available on request.
Specific Properties
Angular particles : maximum 3% in number.
Resistance to Humidity
Glass beads are given a specific anti-lumpiness treatment which increases very considerably their insensitivity to humidity during storage and in the course of use. Moreover, the packaging of the finest granulometries (lower than or equal to 106-212) contains a dehydrating sack.
Packaging
Glass beads are packaged in 25 kg multilayered sacks, on one ton covered pallets.
Quality Control
The quality control of glass beads was established on the basis of the exploitation of data recordings concerning quality compiled during over 10 years of production. A storage sample is kept for 1 year.