Alpha Professional Tools PVA VP 4.5 Inch Hub Dry Polishing Discs
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Description
Description
Alpha® PVA VP 4-1/2" Dry Polishing Disc — with Disposable Zinc Hub
The Alpha® PVA VP polishing disc is a versatile, high-speed, dry polishing system used to bring softer stones and stainless steel to a semi-mirror finish. Formulated with a silicon carbide abrasive and a polyvinyl alcohol bond, the disc is color-coded by grit for easy sequencing and works on most common high-speed angle grinders, sanders and polishers. This 4-1/2" version ships with a 5/8"-11 disposable zinc hub so it threads directly onto any standard angle grinder.
Features
- Dry polishing system — do NOT use with water
- Polishes softer stones (marble, limestone, travertine, softer granite) and stainless steel
- Also works on aluminum, ceramic, wood and most metals
- Excellent for paint, rust and coating removal — disc will not clog
- 4-1/2" diameter x 3/8" thick, 13,200 RPM maximum
- Color-coded by grit: White (Extra Coarse), Red (Coarse), Blue (Medium), Green (Fine), Yellow (Extra Fine)
- Silicon carbide abrasive in polyvinyl alcohol bond — fast working, long lasting
- 5/8"-11 disposable zinc hub — fits any standard 4-1/2" angle grinder
| Part No. | Diameter | Hub | Thread | Grit | UPC |
|---|---|---|---|---|---|
| SPVA45WH | 4-1/2" | Disposable Zinc Hub | 5/8"-11 | Extra Coarse #40 — White | 749173040344 |
| SPVA45RH | 4-1/2" | Disposable Zinc Hub | 5/8"-11 | Coarse #80 — Red | 749173040351 |
| SPVA45BH | 4-1/2" | Disposable Zinc Hub | 5/8"-11 | Medium #220 — Blue | 749173040368 |
| SPVA45GH | 4-1/2" | Disposable Zinc Hub | 5/8"-11 | Fine #400 — Green | 749173040375 |
| SPVA45YH | 4-1/2" | Disposable Zinc Hub | 5/8"-11 | Extra Fine #600 — Yellow | 749173040382 |
- Thread the disc onto a standard 4-1/2" / 5/8"-11 angle grinder, sander or polisher.
- Run DRY only — the PVA VP series cannot be used with water.
- Begin with White (#40, Extra Coarse) for shaping, then step through Red, Blue, Green, Yellow for finer finish.
- On a variable-speed polisher, Alpha® recommends ~5,000 RPM — mid-range gives best finish without overheating the surface.
- Never exceed 13,200 RPM stamped on the disc.
- To reduce dust, pair with Alpha® Ecoguard G dust shroud and a HEPA vacuum for virtually dust-free polishing.
White — SPVA45WH
| Part No. | SPVA45WH |
| UPC | 749173040344 |
| Color | White |
| Thread | 5/8"-11 |
| Max RPM | 13,200 RPM |
| Packaged Weight | 0.40 lbs |
| Package Dimensions | 6in x 5in x 1.25in |
| Commodity Code | 6804.22.0000 |
| Country of Origin | China |
Red — SPVA45RH
| Part No. | SPVA45RH |
| UPC | 749173040351 |
| Color | Red |
| Thread | 5/8"-11 |
| Max RPM | 13,200 RPM |
| Packaged Weight | 0.40 lbs |
| Package Dimensions | 6in x 5in x 1.25in |
| Commodity Code | 6804.22.0000 |
| Country of Origin | China |
Blue — SPVA45BH
| Part No. | SPVA45BH |
| UPC | 749173040368 |
| Color | Blue |
| Thread | 5/8"-11 |
| Max RPM | 13,200 RPM |
| Packaged Weight | 0.40 lbs |
| Package Dimensions | 6in x 5in x 1.25in |
| Commodity Code | 6804.22.0000 |
| Country of Origin | China |
Green — SPVA45GH
| Part No. | SPVA45GH |
| UPC | 749173040375 |
| Color | Green |
| Thread | 5/8"-11 |
| Max RPM | 13,200 RPM |
| Packaged Weight | 0.35 lbs |
| Package Dimensions | 6in x 5in x 1.25in |
| Commodity Code | 6804.22.0000 |
| Country of Origin | China |
Yellow — SPVA45YH
| Part No. | SPVA45YH |
| UPC | 749173040382 |
| Color | Yellow |
| Thread | 5/8"-11 |
| Max RPM | 13,200 RPM |
| Packaged Weight | 0.35 lbs |
| Package Dimensions | 6in x 5in x 1.25in |
| Commodity Code | 6804.22.0000 |
| Country of Origin | China |
| Property | Detail |
|---|---|
| Diameter | 4-1/2" |
| Thickness | 3/8" |
| Maximum RPM | 13,200 |
| Arbor / Hub | 5/8"-11 Disposable Zinc Hub |
| Abrasive | Silicon Carbide in Polyvinyl Alcohol (PVA) bond |
| Application | Dry Use Only |
| Materials | Softer stones, stainless steel, aluminum, ceramic, wood |
| Country of Origin | China |
Can I use PVA VP with water to keep the dust down?
No. PVA VP is a dry-only polishing system. To reduce dust, Alpha® recommends pairing it with Ecoguard G and a HEPA vacuum for virtually dust-free sanding and polishing.
Does Alpha® offer a startup kit for PVA VP?
No. Most applications don't require every grit — for example, glass-edge polishing is typically done with just two grits (Red and Green) — so a kit isn't offered.
Is there a 7" diameter PVA VP for vertical sanders?
Not as a standard item. 4-1/2" is the largest standard size; larger sizes (including 7", with or without disposable hub) can be produced on special order — contact us with your request.
What RPM should I run on a variable-speed grinder?
PVA VP works at any RPM a variable-speed polisher offers. For best balance of finish quality and processing speed, Alpha® recommends ~5,000 RPM — mid-range avoids heat buildup on the surface.
Why is PVA VP color-coded instead of using mesh numbers?
Because of the unique PVA bond and its hardness, PVA VP leaves finer scratches than other bond systems at the same mesh size. Alpha® uses Extra Coarse / Coarse / Medium / Fine / Extra Fine labels with color coding so operators can identify the polishing sequence at a glance.
Why no desiccant pack in the bag anymore?
Two reasons: the disc base is no longer vulcanized fiber (which used to absorb humidity), and the discs now ship in a skin-tight shrink pack that minimizes exposure to humidity in the first place.
No product-specific videos are currently available from the manufacturer or DST.
⚠ WARNING: Cancer and Reproductive Harm — www.P65Warnings.ca.gov. Always wear appropriate PPE.
