Alpha Ceramica Resin Wet Polishing Pad for Granite

Alpha® Ceramica Resin Wet Polishing Pads for Granite

Alpha® Ceramica Resin discs are the backbone of the granite polishing process. Heat-sintered in a mold with a durable resin compound, they stay flexible while delivering consistent, professional results — particularly on curved edges and inside sinkhole cutouts for undermount sinks. Available in 3", 4", and 5" diameters across the full six-grit sequence (#150 through #3000), Ceramica Resin is engineered for hand polishing on a center water-feed polisher at low RPM (2,000–2,500 optimal, 4,000 max).

Features

Heat-sintered resin bond — flexible with consistent performance
Designed for wet hand polishing of granite edges & curves (sinkholes, undermounts)
Hook & loop backing — pairs with Alpha® flexible or rigid backer pads
Six-grit sequence: #150, #300, #500, #1000, #2000, #3000
Three diameters: 3", 4", 5" (4" is the most common)
Cost-effective vs. competitive polishing discs

Models / Part Numbers

Part No.	Size	Grit	Color	Max RPM	UPC
GP30150R	3"	#150	Yellow	4,000	749173520174
GP30300R	3"	#300	Orange	4,000	749173510052
GP30500R	3"	#500	Red	4,000	749173520198
GP31000R	3"	#1000	Dark Green	4,000	749173520204
GP32000R	3"	#2000	Light Green	4,000	749173520211
GP33000R	3"	#3000	Brown	4,000	749173520228
GP40150R	4"	#150	Yellow	4,000	749173520327
GP40300R	4"	#300	Orange	4,000	749173510069
GP40500R	4"	#500	Red	4,000	749173520341
GP41000R	4"	#1000	Dark Green	4,000	749173520358
GP42000R	4"	#2000	Light Green	4,000	749173520365
GP43000R	4"	#3000	Brown	4,000	749173520372
GP50150R	5"	#150	Yellow	4,000	749173520471
GP50300R	5"	#300	Orange	4,000	749173510076
GP50500R	5"	#500	Red	4,000	749173520495
GP51000R	5"	#1000	Dark Green	4,000	749173520501
GP52000R	5"	#2000	Light Green	4,000	749173520518
GP53000R	5"	#3000	Brown	4,000	749173520525

How to Use

Pre-grind saw and grinding marks with an Alpha® #60 Vitrified disc before starting Ceramica Resin — this protects the #150 grit and extends its life.
Mount a backer pad on a center water-feed polisher (e.g. Alpha® VSP-320 or AIR-680). Use a flexible backer for curves/bullnose and a rigid backer for flat edges or straight runs.
Run the full grit sequence in order: #150 → #300 → #500 → #1000 → #2000 → #3000. Skipping grits will not yield a high-quality finish.
Polish at 2,000–2,500 RPM (4,000 RPM max). Higher speeds reduce finish quality and burn discs. Use 2 to 3 passes per grit on average — do not rush.
Keep center water flowing at all times. Ceramica Resin is wet-only.
For final gloss on dark granite, follow Ceramica Resin with an Alpha® Ceramica Buff (black for dark stones, white for light). Do not use Ceramica Resin on engineered stone — use Ceramica EX instead.

Specifications by Variant

Yellow (#150 grit) — 3" (76 mm) — Hook & Loop — Wet Resin Polishing Pad — GP30150R

Part No.	GP30150R
UPC	749173520174
Size	3" (76 mm)
Type	Wet Resin Polishing Pad
Color	Yellow (#150 grit)
Attachment	Hook & Loop
Max RPM	4,000 RPM (optimal 2,000–2,500)
Recommended For	Initial wet polishing — removes saw & grinding marks
Packaged Weight	0.10 lbs
Package Dimensions	3.25" x 3.25" x 0.25"
Commodity Code	6804.21.0090
Country of Origin	Japan

Orange (#300 grit) — 3" (76 mm) — Hook & Loop — Wet Resin Polishing Pad — GP30300R

Part No.	GP30300R
UPC	749173510052
Size	3" (76 mm)
Type	Wet Resin Polishing Pad
Color	Orange (#300 grit)
Attachment	Hook & Loop
Max RPM	4,000 RPM (optimal 2,000–2,500)
Recommended For	Intermediate wet polishing on granite edges & sinkholes
Packaged Weight	0.10 lbs
Package Dimensions	3.25" x 3.25" x 0.25"
Commodity Code	6804.21.0090
Country of Origin	Japan

Red (#500 grit) — 3" (76 mm) — Hook & Loop — Wet Resin Polishing Pad — GP30500R

Part No.	GP30500R
UPC	749173520198
Size	3" (76 mm)
Type	Wet Resin Polishing Pad
Color	Red (#500 grit)
Attachment	Hook & Loop
Max RPM	4,000 RPM (optimal 2,000–2,500)
Recommended For	Intermediate wet polishing on granite edges & sinkholes
Packaged Weight	0.10 lbs
Package Dimensions	3.25" x 3.25" x 0.25"
Commodity Code	6804.21.0090
Country of Origin	Japan

Dark Green (#1000 grit) — 3" (76 mm) — Hook & Loop — Wet Resin Polishing Pad — GP31000R

Part No.	GP31000R
UPC	749173520204
Size	3" (76 mm)
Type	Wet Resin Polishing Pad
Color	Dark Green (#1000 grit)
Attachment	Hook & Loop
Max RPM	4,000 RPM (optimal 2,000–2,500)
Recommended For	Refining wet polishing on granite edges
Packaged Weight	0.10 lbs
Package Dimensions	3.25" x 3.25" x 0.25"
Commodity Code	6804.21.0090
Country of Origin	Japan

Light Green (#2000 grit) — 3" (76 mm) — Hook & Loop — Wet Resin Polishing Pad — GP32000R

Part No.	GP32000R
UPC	749173520211
Size	3" (76 mm)
Type	Wet Resin Polishing Pad
Color	Light Green (#2000 grit)
Attachment	Hook & Loop
Max RPM	4,000 RPM (optimal 2,000–2,500)
Recommended For	Final-stage wet polishing on granite edges
Packaged Weight	0.10 lbs
Package Dimensions	3.25" x 3.25" x 0.25"
Commodity Code	6804.21.0090
Country of Origin	Japan

Brown (#3000 grit) — 3" (76 mm) — Hook & Loop — Wet Resin Polishing Pad — GP33000R

Part No.	GP33000R
UPC	749173520228
Size	3" (76 mm)
Type	Wet Resin Polishing Pad
Color	Brown (#3000 grit)
Attachment	Hook & Loop
Max RPM	4,000 RPM (optimal 2,000–2,500)
Recommended For	Final-stage wet polishing on granite edges
Packaged Weight	0.10 lbs
Package Dimensions	3.25" x 3.25" x 0.25"
Commodity Code	6804.21.0090
Country of Origin	Japan

Yellow (#150 grit) — 4" (102 mm) — Hook & Loop — Wet Resin Polishing Pad — GP40150R

Part No.	GP40150R
UPC	749173520327
Size	4" (102 mm)
Type	Wet Resin Polishing Pad
Color	Yellow (#150 grit)
Attachment	Hook & Loop
Max RPM	4,000 RPM (optimal 2,000–2,500)
Recommended For	Initial wet polishing — removes saw & grinding marks
Packaged Weight	0.10 lbs
Package Dimensions	4.25" x 4.25" x 0.25"
Commodity Code	6804.21.0090
Country of Origin	Japan

Orange (#300 grit) — 4" (102 mm) — Hook & Loop — Wet Resin Polishing Pad — GP40300R

Part No.	GP40300R
UPC	749173510069
Size	4" (102 mm)
Type	Wet Resin Polishing Pad
Color	Orange (#300 grit)
Attachment	Hook & Loop
Max RPM	4,000 RPM (optimal 2,000–2,500)
Recommended For	Intermediate wet polishing on granite edges & sinkholes
Packaged Weight	0.10 lbs
Package Dimensions	4.25" x 4.25" x 0.25"
Commodity Code	6804.21.0090
Country of Origin	Japan

Red (#500 grit) — 4" (102 mm) — Hook & Loop — Wet Resin Polishing Pad — GP40500R

Part No.	GP40500R
UPC	749173520341
Size	4" (102 mm)
Type	Wet Resin Polishing Pad
Color	Red (#500 grit)
Attachment	Hook & Loop
Max RPM	4,000 RPM (optimal 2,000–2,500)
Recommended For	Intermediate wet polishing on granite edges & sinkholes
Packaged Weight	0.10 lbs
Package Dimensions	4.25" x 4.25" x 0.25"
Commodity Code	6804.21.0090
Country of Origin	Japan

Dark Green (#1000 grit) — 4" (102 mm) — Hook & Loop — Wet Resin Polishing Pad — GP41000R

Part No.	GP41000R
UPC	749173520358
Size	4" (102 mm)
Type	Wet Resin Polishing Pad
Color	Dark Green (#1000 grit)
Attachment	Hook & Loop
Max RPM	4,000 RPM (optimal 2,000–2,500)
Recommended For	Refining wet polishing on granite edges
Packaged Weight	0.10 lbs
Package Dimensions	4.25" x 4.25" x 0.25"
Commodity Code	6804.21.0090
Country of Origin	Japan

Light Green (#2000 grit) — 4" (102 mm) — Hook & Loop — Wet Resin Polishing Pad — GP42000R

Part No.	GP42000R
UPC	749173520365
Size	4" (102 mm)
Type	Wet Resin Polishing Pad
Color	Light Green (#2000 grit)
Attachment	Hook & Loop
Max RPM	4,000 RPM (optimal 2,000–2,500)
Recommended For	Final-stage wet polishing on granite edges
Packaged Weight	0.10 lbs
Package Dimensions	4.25" x 4.25" x 0.25"
Commodity Code	6804.21.0090
Country of Origin	Japan

Brown (#3000 grit) — 4" (102 mm) — Hook & Loop — Wet Resin Polishing Pad — GP43000R

Part No.	GP43000R
UPC	749173520372
Size	4" (102 mm)
Type	Wet Resin Polishing Pad
Color	Brown (#3000 grit)
Attachment	Hook & Loop
Max RPM	4,000 RPM (optimal 2,000–2,500)
Recommended For	Final-stage wet polishing on granite edges
Packaged Weight	0.10 lbs
Package Dimensions	4.25" x 4.25" x 0.25"
Commodity Code	6804.21.0090
Country of Origin	Japan

Yellow (#150 grit) — 5" (127 mm) — Hook & Loop — Wet Resin Polishing Pad — GP50150R

Part No.	GP50150R
UPC	749173520471
Size	5" (127 mm)
Type	Wet Resin Polishing Pad
Color	Yellow (#150 grit)
Attachment	Hook & Loop
Max RPM	4,000 RPM (optimal 2,000–2,500)
Recommended For	Initial wet polishing — removes saw & grinding marks
Packaged Weight	0.20 lbs
Package Dimensions	5.25" x 5.25" x 0.25"
Commodity Code	6804.21.0090
Country of Origin	Japan

Orange (#300 grit) — 5" (127 mm) — Hook & Loop — Wet Resin Polishing Pad — GP50300R

Part No.	GP50300R
UPC	749173510076
Size	5" (127 mm)
Type	Wet Resin Polishing Pad
Color	Orange (#300 grit)
Attachment	Hook & Loop
Max RPM	4,000 RPM (optimal 2,000–2,500)
Recommended For	Intermediate wet polishing on granite edges & sinkholes
Packaged Weight	0.20 lbs
Package Dimensions	5.25" x 5.25" x 0.25"
Commodity Code	6804.21.0090
Country of Origin	Japan

Red (#500 grit) — 5" (127 mm) — Hook & Loop — Wet Resin Polishing Pad — GP50500R

Part No.	GP50500R
UPC	749173520495
Size	5" (127 mm)
Type	Wet Resin Polishing Pad
Color	Red (#500 grit)
Attachment	Hook & Loop
Max RPM	4,000 RPM (optimal 2,000–2,500)
Recommended For	Intermediate wet polishing on granite edges & sinkholes
Packaged Weight	0.20 lbs
Package Dimensions	5.25" x 5.25" x 0.25"
Commodity Code	6804.21.0090
Country of Origin	Japan

Dark Green (#1000 grit) — 5" (127 mm) — Hook & Loop — Wet Resin Polishing Pad — GP51000R

Part No.	GP51000R
UPC	749173520501
Size	5" (127 mm)
Type	Wet Resin Polishing Pad
Color	Dark Green (#1000 grit)
Attachment	Hook & Loop
Max RPM	4,000 RPM (optimal 2,000–2,500)
Recommended For	Refining wet polishing on granite edges
Packaged Weight	0.20 lbs
Package Dimensions	5.25" x 5.25" x 0.25"
Commodity Code	6804.21.0090
Country of Origin	Japan

Light Green (#2000 grit) — 5" (127 mm) — Hook & Loop — Wet Resin Polishing Pad — GP52000R

Part No.	GP52000R
UPC	749173520518
Size	5" (127 mm)
Type	Wet Resin Polishing Pad
Color	Light Green (#2000 grit)
Attachment	Hook & Loop
Max RPM	4,000 RPM (optimal 2,000–2,500)
Recommended For	Final-stage wet polishing on granite edges
Packaged Weight	0.20 lbs
Package Dimensions	5.25" x 5.25" x 0.25"
Commodity Code	6804.21.0090
Country of Origin	Japan

Brown (#3000 grit) — 5" (127 mm) — Hook & Loop — Wet Resin Polishing Pad — GP53000R

Part No.	GP53000R
UPC	749173520525
Size	5" (127 mm)
Type	Wet Resin Polishing Pad
Color	Brown (#3000 grit)
Attachment	Hook & Loop
Max RPM	4,000 RPM (optimal 2,000–2,500)
Recommended For	Final-stage wet polishing on granite edges
Packaged Weight	0.20 lbs
Package Dimensions	5.25" x 5.25" x 0.25"
Commodity Code	6804.21.0090
Country of Origin	Japan

Common Specifications

Property	Detail
Application	Wet hand polishing of granite edges & curves
Bond / Construction	Heat-sintered durable resin compound
Attachment	Hook & loop
Optimal RPM	2,000–2,500
Max RPM	4,000
Sizes Offered	3 in (76 mm), 4 in (102 mm), 5 in (127 mm)
Grit Sequence	#150, #300, #500, #1000, #2000, #3000
Water	Center water-feed required (wet-use only)
Pre-Step	Alpha® #60 Vitrified disc to remove saw & grinding marks
Recommended Tools	Alpha® VSP-320 variable-speed polisher, AIR-680 pneumatic polisher
Final Step	Alpha® Ceramica Buff (Black for dark stones, White for light)
NOT For	Engineered/quartz stone (use Ceramica EX), floor machines (use Advantage Floor), angle grinders >4,000 RPM

Related & Companion Products

FAQs

Do I really need every grit in the sequence?

Yes. Using anything less than the full sequence will not yield a high-quality finish.

What materials does Ceramica Resin work on?

Ceramica Resin is designed for use on granite only. For engineered/quartz stone use Ceramica EX.

Why start with a #60 Vitrified disc?

The #60 Vitrified removes saw and grinding marks. Skipping it forces the #150 grit to work harder and shortens its life.

Can I use Ceramica Resin on an angle grinder?

No. Ordinary angle grinders are far too fast and will burn the discs. Use only water-feed polishers at 4,000 RPM max.

Center water-feed or sponge water?

Center water-feed only. Alpha® recommends the VSP-320 or AIR-680.

How long does a disc last?

It depends on material and technique, but Alpha® studies show no competing disc comes close to Ceramica Resin’s lifespan.

How many passes per grit?

On average 2 to 3 passes per grit. Don’t rush — each grit must do its job.

What is the optimal RPM?

Designed to run at 2,000–2,500 RPM, with 4,000 RPM as the absolute maximum. Exceeding this reduces finish quality.

Vitrified vs. Resin — what is the difference?

Vitrified discs are more aggressive: about 3× faster material removal and longer life. Use vitrified for prep, resin for finishing.

Can I polish engineered stone with Ceramica Resin?

No. Ceramica Resin is granite-only. For engineered stone use Alpha® Ceramica EX.

Can I use Ceramica Resin on a floor-polishing machine?

No — these are hand-polishing discs only. Use Alpha® Advantage Floor discs for floors.

What sizes are available?

Ceramica Resin is offered in 3", 4", and 5" diameters. 4" is the most common.

Flexible or rigid backer pad?

Flexible (rubber) backers for curves and bullnose work; rigid backers for flat areas and straight edges.

Dark granite still looks gray after polishing — why?

Cloudy/gray areas mean a lower grit did not fully remove its predecessor’s scratches. Run the full #60→#3000 sequence with adequate passes.

My employees dislike working wet.

Fabrication is easier, faster, and much healthier when worked wet. Proper attire keeps operators dry.

What polishing powder do you recommend after #3000?

None — skip the sloppy chemicals. Finish with an Alpha® Ceramica Buff disc instead.

Videos

No product-specific videos are currently available from the manufacturer or DST.

Documentation

⚠ WARNING: Cancer and Reproductive Harm — www.P65Warnings.ca.gov. Always wear appropriate PPE.

Size	3", 4", 5"
Grit	#150, #300, #500, #1000, #2000, #3000
Brand	Alpha
Wet / Dry Use	Wet