Dry vs. Wet Stone Grinding: Key Differences and Selection Guide

In stone grinding, the process without water is called dry grinding, while adding water during grinding is known as wet grinding. Beyond this basic distinction, what are the other differences between the two? How should one choose? Today, we’ll explain it.

What are the differences between dry grinding and wet grinding?

Different Grinding Pads

Mainstream market pads focus on grinding and are mostly made from artificial diamond particles and resin binders. Diamonds are typically called diamonds, while resin, broadly speaking, refers to various high-molecular polymers that can serve as plastic raw materials.

Stone grinding creates friction between the pad and stone surface, generating high temperatures under the machine’s speed and pressure. This heat can melt ordinary resin, causing low-quality pads to deform easily.

Wet stone grinding adds water to accelerate heat dissipation, allowing slightly lower requirements for pad components. In dry stone grinding without water, heat dissipates slowly, so dry grinding pads must use high-quality resin that withstands higher temperatures.

Simply put: Due to their composition, dry grinding pads can also be used for wet grinding, but ordinary wet grinding pads cannot handle prolonged dry grinding. Pads made with high-quality resin work for both dry and wet grinding.

How to Choose Grinding Pads

Dry grinding on stone lacks water, so heat dissipates slowly—dry pads must use premium, high-temperature resistant resin.

Wet grinding adds water to speed up heat dissipation, allowing slightly lower pad component standards.

Due to composition, dry pads work for wet grinding, but standard wet pads can’t handle prolonged dry use. Premium resin pads suit both methods. Dry grinding isn’t strictly water-free; lightly add water if dark stones turn white during process for better results.

When to Use Wet Grinding

High temperatures from stone grinding can damage the stone’s crystal structure, leading to issues like loss of shine, cracking, or powdering.

Adding water during wet grinding accelerates heat dissipation, minimizing harm to the stone and producing a soft, bright, crystalline gloss under natural temperatures.

Dry grinding’s instant friction heat damages crystal structures, causing glare, burns, dryness, or dull shine—use wet for sensitive stones or superior finish.

When to Use Dry Grinding

01. Untreated Stone

Untreated stone absorbs water easily; wet grinding opens the surface but prolongs drying time. Before applying sealant, use dry grinding to expose the surface efficiently.

02. Grinding and Polishing Stage

Use wet grinding for leveling and optimization, then switch to dry for polishing to speed up shine development. After reaching 1000 grit with water, reduce or eliminate water for semi-dry or full dry grinding—this practical technique enhances gloss.

03. Walls, Edges, and Countertops

Walls require dry grinding due to lack of water setup; imagine water slurry splashing onto new furniture in a client’s living room.

For finishing edges, corners unreachable by large machines, lines, small repairs, or countertops, dry grinding offers greater convenience.