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Size Designations for Impact Media

Choosing impact media of the right size is essential for the success of mechanical plating and galvanizing processes. Our size designations are based upon mesh screen sizes, which can be found in ASTM E11. The first two digits represent the smallest screen through which most of the beads will pass, and the next two digits represent the largest screen upon which most of the beads will be retained. For example, the PS1625 is a glass bead mixture with 80 percent of the beads larger than 25 mesh and smaller than 16 mesh. The following is a list of glass bead sizes available from PS&T:

PS0304 A 5mm Molded Bead
PS0406 A 4mm Molded Bead
PS0607 A 2.85mm-3.30mm Screened Bead Mixture
PS0810 A 2.00mm-2.30mm Screened Bead Mixture
PS1012 A 1.70mm-2.00mm Screened Bead Mixture
PS1014 A 1.55mm-1.85mm Screened Bead Mixture
PS1216 A 1.25mm-1.55mm Screened Bead Mixture
PS1418 A 1.00mm-1.25mm Screened Bead Mixture
PS1825 A 0.75mm-1.00mm Screened Bead Mixture
PS2030 A 20-30 Mesh (80 percent Range) Bead Mixture
PS3040 A 30-40 Mesh (80 percent Range) Bead Mixture
PS4060 A 40-50 Mesh (80 percent Range) Bead Mixture
PS5070 A 50-70 Mesh (80 percent Range) Bead Mixture
PS6080 A 60-80 Mesh (80 percent Range) Bead Mixture
PS7000 A 70-100 Mesh (80 percent Range) Bead Mixture

Special Orders

PS&T can also "special order" any type of glass beads that you might require for any special application. Simply contact us and let us know what you need.

Size Variation

Beads are conventionally given a nominal size range. However, not all beads fall into that size range. Up to 20 percent may, by specification, be above or below the nominal size range. For example, a typical 20-30 mesh bead may have as much as 5 percent as large as 14 mesh (but none as large as 12 mesh) and as much as 15 percent finer than 30 mesh (but not finer than 40 mesh). If this represents a problem for a specific part type, the plater can screen out the offending media sizes using appropriately sized screens.

Beads that are very fine (100 mesh and above) are quickly lost in most mechanical plating processes because of hydraulic flow. The lighter a bead is, the more likely that the flow will be strong enough to carry the bead into the waste treatment system. For that reason, all platers make up their load of glass beads primarily with fine beads. Some have practices in which they routinely add a fixed quantity of beads (often 50 pounds or one bag) per barrel per week.

Occasionally, the media will become so severely contaminated with tramp metal and metallic fines that the most economic means of recovering it is to remove all of the fine particles — glass beads and contaminants — and discard them.

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Glass Bead Sizes