Dry tumbling media is primarily used for polishing, smoothing, and brightening part surfaces without water, slurry, or wet compound. It excels in applications requiring a controlled, clean process: jewelry and precious metal polishing, medical device finishing, aerospace components, electronics hardware, firearms, and optics. Corn cob media is also widely used post-wet-processing as a drying and oil absorption step — its porous structure removes moisture and light oils before parts go to packaging or assembly.

Each carrier has distinct properties: Corn cob (~33 lbs/ft³) is the softest and most porous — ideal for drying parts, absorbing oils, and gentle polishing of delicate non-ferrous metals. Walnut shell (~45 lbs/ft³) is harder and more angular, providing the widest range of polishing and light cutting capabilities with 20+ treatment variants — the most versatile all-around dry carrier. Coconut shell (~45 lbs/ft³) is semi-angular with a balance of cutting and polishing action, particularly well-suited to titanium, stainless steel, and aluminum pre-polishing.

Dry tumbling eliminates the slurry mess, compound costs, and wastewater treatment requirements of wet processing. It excels at polishing delicate parts and maintaining tight tolerances without dimensional changes. Dry media is also the only option for parts that cannot be exposed to water or chemical compounds. The trade-off is that dry media cannot match the heavy stock removal or deburring speed of wet ceramic — dry processing is fundamentally a polishing and surface refinement operation, not a heavy deburring one.

Yes. With the right carrier, treatment additive, and process parameters, dry polishing media achieves mirror-quality finishes. Walnut shell with red rouge additive (D-WS 29-300) reaches Ra values as low as 3.5 µin on brass and copper alloys. For medical implants and jewelry, treated walnut shell grades D-WS 17 and D-WS 18 deliver the highest available luster. The key is pairing the correct carrier grade with the right treatment additive for your specific metal and finish target.

Most dry polishing media is sold pre-treated — impregnated with the appropriate polishing compound — so the majority of grades work out of the box with no additives required. For extended batch life, replace approximately 15% of your media volume with fresh treated media to recharge a batch. Untreated carriers (D-CC 00, D-WS 00) do require separate compound additives and are used when you need to control the treatment chemistry precisely for specialized applications.

For stainless steel, walnut shell grades D-WS 46 and D-WS 47 provide excellent color and cut (Ra down to 2.0 µin). For chrome and titanium, D-WS 74 delivers excellent cutting capability. D-WS 27 serves as an all-purpose polisher across aluminum, ferrous metals, and stainless. Coconut shell media is also effective on titanium and stainless when light pre-polishing grinding is needed. For the highest luster on hard metals, a multi-step process — coarser grade first, then a finer finishing grade — is recommended.