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Here is a targeted FAQ for Glass Bead Abrasive GB-3 / Coarse II ‘BL’ (425-600 Microns).
Technical FAQ: Glass Bead Abrasive GB-3 (425-600 μm)
What is Glass Bead Abrasive GB-3 / Coarse II ‘BL’?
GB-3 (Coarse II ‘BL’) is a high-quality spherical abrasive media manufactured from soda-lime glass. With a micron range of 425-600, it is classified as a coarse grade designed for heavy-duty surface finishing where a deeper texture or more aggressive cleaning is required without removing base metal.
What are the primary applications for 425-600 micron glass beads?
Due to its larger particle size, the GB-3 grade is ideal for:
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Heavy Deburring: Removing significant burrs from machined parts.
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Peening: Increasing fatigue strength in thicker metal components.
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Surface Preparation: Creating a uniform, matte finish on stainless steel and aluminum.
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Scale Removal: Cleaning heat-treat scale or heavy oxidation from industrial equipment.
How does the GB-3 micron size compare to other grades?
The 425-600 micron range (roughly 30-40 US Mesh) is significantly coarser than standard finishing beads. While finer beads (e.g., 100-200 μm) provide a smooth, satin polish, the GB-3 grade provides a higher impact velocity, making it more effective for cleaning heavy contaminants and achieving a pronounced “peened” texture.
Is Glass Bead GB-3 safe for the environment and operators?
Yes. Unlike silica sand, glass beads are silica-free, which eliminates the risk of silicosis. They are chemically inert, non-toxic, and do not leave ferrous contamination on the workpiece, making them the preferred choice for stainless steel and aerospace applications.
What are the technical specifications for Coarse II ‘BL’ glass beads?
| Property | Specification |
| Micron Size | 425 – 600 μm |
| Shape | Spherical (≥ 70% roundness) |
| Material | Soda-lime Glass |
| Hardness | 6 – 7 Mohs |
| Specific Gravity | Approx. 2.5 g/cm³ |
| Color | Clear / White |
Can GB-3 Glass Beads be reused?
Absolutely. Glass beads are designed for multi-cycle use in blast cabinets. Their spherical shape allows them to bounce off surfaces without shattering immediately, though the breakdown rate increases if the blast pressure exceeds 60-80 PSI.
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