Walnut Shell Grinder are excellent soft grit abrasives used in blast cleaning and tumbling. Walnut shell grit is used in applications that require aggressive stripping or cleaning without damage or effect on the underlying subtrate. Organic and biodegradable, walnut shell is extremely durable, angular in shape but considered a soft abrasive.Also used in the oil industry as lost circulation material and as a filter media for cleaning produced water. Available in extra course to extra fine.
Walnut Shell Abrasive – Natural, Tough & Eco-Friendly Blasting Media
Product Description
Our Walnut Shell Abrasive (Walnut Shell Grit) is a naturally derived, biodegradable blasting medium made from carefully crushed and screened walnut shells. It offers an exceptional balance of hardness and softness—aggressive enough to remove coatings and contaminants, yet soft enough not to damage the underlying substrate. It is the preferred choice for surface preparation, cleaning, and polishing across automotive, aerospace, marine, and industrial applications.
Key Features & Benefits
Non-Abrasive to Substrates: Cleans effectively without etching, pitting, or dimensional change to delicate surfaces (aluminum, fiberglass, alloys, plastics, and soft metals).
High Durability & Low Dust: Dense particle structure provides multiple re-use cycles in blast cabinets, reducing media consumption and airborne dust.
100% Organic & Biodegradable: Contains no free silica, heavy metals, or chemical additives. Safe for operators and environmentally responsible disposal.
Excellent Deburring & Deflashing: Removes sharp edges and mold flash from plastic, rubber, and electronic components without surface stress.
Uniform Particle Distribution: Consistent sizing (available in standard grit ranges) ensures predictable surface profiles and reliable finishing results.
Common Applications
Industry Typical Use
Automotive & Aviation Cleaning engine components, turbine blades, aluminum wheels, and carbon removal without affecting tolerances.
Marine & Yacht Maintenance Stripping anti-fouling paint from fiberglass hulls without gel coat damage.
Electronics & Plastics Deflashing circuit boards, connectors, and molded plastic parts.
Industrial Maintenance Removing light rust, scale, and grease from molds, dies, and precision tools.
Stone & Monument Cleaning Gentle removal of graffiti and soot from historic masonry and soft stone.
Available Grades & Packaging
We offer a comprehensive range of grit sizes to match specific equipment and surface finish requirements:
Coarse Grit (e.g., 6/10, 8/12, 12/20): Fast stripping of heavy coatings and paint.
Medium Grit (e.g., 20/30, 20/40): General purpose cleaning and moderate deburring.
Fine/Polish Grit (e.g., 40/60, 60/100, 80/200): Light cleaning, final polish, and delicate deflashing.
Packaging: 50 lb (22.7 kg) heavy-duty poly bags, 2000 lb (907 kg) bulk super sacks, or custom packaging per customer request.
Technical Specifications (Typical Values)
Composition: 100% Crushed Walnut Shell
Hardness: 2.5 – 3.5 MOHS
Specific Gravity: 1.2 – 1.4 g/cc
Bulk Density: Approx. 45 – 55 lbs/ft³ (720 – 880 kg/m³)
Free Silica Content: < 1%
Why Choose Our Walnut Shell Abrasive?
Unlike synthetic plastic media that can melt or warp under heat, or mineral abrasives that can fracture substrates, walnut shell grit maintains its structural integrity and provides a cool, clean, and non-corrosive finish. It is the industry standard for "Clean and Inspect" operations.
For bulk pricing, samples, or a customized grit analysis, please contact our sales team.
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Appearance
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Granular
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Color
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Brown
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Specific Gravity
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1.2-1.4
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Solubility
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Insoluble
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Volumetric Weight
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850kg/m3
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Proportion
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1.2-1.5g/cm3
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Rind Puffing Rate
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3%
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Wear Rate
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≤1.5 %
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Oil Removal Efficiency
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90-95%
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Void Ratio
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47
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Charring Temperature
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243°C (470°F)
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Bulk Density
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0.8g/cm3
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Backwashing Strength
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25m3/m2.h
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Particle Shape
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Irregular
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Water Flushing Pressure
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0.32MPa
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Filtration Rate
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20-26m/h
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PH at 25°C in neutral water
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4-6
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Oil Content
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0.25%
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Free moisture(80ºC for 15 HRS)
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3-9%
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Hardness
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MOH 2.5-4
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Suspended Solids Removal Rate
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95-98%
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Dilatability
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0.5%
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Size Range:
| Model |
Size (mm)
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Model |
Size (mm)
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| 6# |
3.35-4.00 |
35# |
0.500-0.600 |
| 7# |
2.80-3.35 |
45# |
0.355-0.500 |
| 8# |
2.36-2.80 |
60# |
0.250-0.355 |
| 10# |
2.00-2.36 |
80# |
0.180-0.250 |
| 12# |
1.70-2.00 |
100# |
0.150-0.180 |
| 14# |
1.40-1.70 |
120# |
0.125-0.150 |
| 16# |
1.18-1.40 |
150# |
0.100-0.125 |
| 18# |
1.00-1.18 |
180# |
0.080-0.100 |
| 20# |
0.850-1.00 |
200# |
0.075-0.080 |
| 25# |
0.710-0.850 |
240# |
0.063-0.075 |
| 30# |
0.600-0.710 |
280# |
0.050-0.06 |
Walnut Shell Grinder for Polishing:
Walnut Shell Grinder are used in many polishing and/or deburring applications. Walnut shell media is used for polishing or cleaning fine metals, alloys, mechanical parts, shell cartridges, eye glass lens, rocks, stones, coral, ivory, beans, and seeds.
Jewelers use walnut shell media treated with rouge in both tumbling and vibratory applications for polishing gems and fine jewelry.
When polishing the media size should be small enough to freely pass through openings or large enough to avoid lodging in openings or crevices.
Walnut Shell Grinder for abrasive blasting:
Walnut Shell Grinder are a type of abrasive blast media used for cleaning. Typical substrates are metals, fiberglass, woods, plastics and stone. The walnut shells are ground to various sizes from coarse to extra fine depending on the application. The walnut shells are used in the same manner as typical blast media. Walnut shells are durable and can be re-used in many applications. Walnut shells can remove matter from surfaces without scratching or pitting underlying material.
Walnut shell is biodegradable, non-toxic, environmentally safe and cost effective for blasting. Walnut shell does not cause silicosis.
Details Pictures:
