Complete reference guide for converting mesh sizes to particle sizes in microns for calcite powder, dolomite powder, and ground calcium carbonate (GCC).
How to Use This Chart
Mesh size refers to the number of openings per linear inch in a sieve. Higher mesh numbers indicate smaller particles. Use this chart to select the right particle size for your application.
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How to calculate mesh size in microns: use the formula Microns = 25,400 ÷ Mesh Number. For example, 400 mesh = 25,400 ÷ 400 = 63.5 microns (theoretical opening). In practice, particle sizes are slightly smaller due to wire thickness. For quick results, use our Mesh to Micron Converter.
Mesh to Micron Conversion Formula
The standard theoretical formula used for mesh to micron conversion is:
Microns = 25,400 ÷ Mesh Size
For example:
- 200 mesh: 25,400 ÷ 200 = 127 microns (theoretical)
- 400 mesh: 25,400 ÷ 400 = 63.5 microns (theoretical)
- 600 mesh: 25,400 ÷ 600 ≈ 42.3 microns (theoretical)
- 1000 mesh: 25,400 ÷ 1000 = 25.4 microns (theoretical)
In real-world industrial use, actual particle sizes are slightly smaller than the theoretical opening due to wire diameter and sieving efficiency. That’s why we show both theoretical and practical values in the chart below and align them with our Mesh to Micron Converter.
Complete Mesh Size Conversion Table
| Mesh Size | Theoretical (µm) | Theoretical (mm) | Practical (µm) | Practical (mm) | Typical Applications | Available in |
|---|---|---|---|---|---|---|
| 100 | 254 | 0.254 | 149 | 0.149 | Coarse construction materials, bulk fillers | Dolomite, GCC |
| 120 | 211.7 | 0.212 | 125 | 0.125 | Construction materials, coarse industrial applications | Dolomite, GCC |
| 140 | 181.4 | 0.181 | 105 | 0.105 | Construction materials, coarse industrial applications | Dolomite, GCC |
| 170 | 149.4 | 0.149 | 88 | 0.088 | General industrial applications | All Products |
| 200 | 127.0 | 0.127 | 74 | 0.074 | Construction materials, coarse fillers | All Products |
| 230 | 110.4 | 0.110 | 63 | 0.063 | General industrial applications | All Products |
| 270 | 94.1 | 0.094 | 53 | 0.053 | Standard industrial applications, paints | All Products |
| 325 | 78.2 | 0.078 | 44 | 0.044 | Fine industrial applications | All Products |
| 400 | 63.5 | 0.064 | 38 | 0.038 | Standard paints, plastics, rubber | All Products |
| 500 | 50.8 | 0.051 | 25 | 0.025 | Premium paints, fine plastics | All Products |
| 600 | 42.3 | 0.042 | 20 | 0.020 | High-end coatings, fine papers | All Products |
| 635 | 40.0 | 0.040 | 20 | 0.020 | High-quality coatings, fine applications | All Products |
| 800 | 31.8 | 0.032 | ~15 | 0.015 | Premium coatings, fine papers | All Products |
| 1000 | 25.4 | 0.025 | ~10 | 0.010 | Ultra-fine applications, specialty uses | All Products |
| 1200 | 21.2 | 0.021 | ~8 | 0.008 | Specialty applications, premium papers | Calcite, GCC |
| 1500 | 16.9 | 0.017 | ~5 | 0.005 | Ultra-fine specialty applications | Calcite, GCC |
200 Mesh to Micron
200 mesh = 74 microns (practical particle size)
Theoretical opening: 127 microns | In millimetres: 0.074 mm
Formula: 25,400 ÷ 200 = 127 µm (theoretical); practical sieved value ≈ 74 µm
At 200 mesh, particles pass through a sieve with 200 openings per linear inch. The practical diameter of 74 microns makes 200 mesh powder suitable for:
- Construction materials — mortar, plaster, cement additives
- Coarse industrial paints — exterior wall coatings, industrial primers
- Rubber compounding — filler in tyre and conveyor belt manufacturing
- Bulk mineral fillers — general-purpose filler applications
Shikhar Microns supplies 200 mesh calcite powder, dolomite powder, and GCC from Rajasthan. Check 200 mesh on our converter →
325 Mesh to Micron
325 mesh = 44 microns (practical particle size)
Theoretical opening: 78.2 microns | In millimetres: 0.044 mm
Formula: 25,400 ÷ 325 = 78.2 µm (theoretical); practical sieved value ≈ 44 µm
325 mesh is one of the most commonly ordered grades for mid-range industrial applications in India. At 44 microns practical particle size, it sits between coarse construction grades and fine premium grades:
- Paints & coatings — industrial coatings, distemper, textured finishes
- Plastics — reinforced plastics, injection moulding compounds
- Rubber — technical rubber goods, shoe soles
- Paper manufacturing — base filler for standard printing paper
All Shikhar Microns products — calcite, dolomite, limestone, GCC, coated grades — are available at 325 mesh. Request a free sample →
500 Mesh to Micron
500 mesh = 25 microns (practical particle size)
Theoretical opening: 50.8 microns | In millimetres: 0.025 mm
Formula: 25,400 ÷ 500 = 50.8 µm (theoretical); practical sieved value ≈ 25 µm
500 mesh powder at 25 microns is a fine grade used where surface smoothness and opacity matter most:
- Premium architectural paints — interior emulsions, high-gloss finishes
- Plastic films & sheets — thin-film extrusion, BOPP film filler
- High-quality rubber — medical-grade rubber, precision moulded parts
- Specialty paper — coated art paper, photographic base paper
Shikhar Microns supplies 500 mesh calcite powder, GCC, and coated calcite in bulk from Alwar, Rajasthan. Use our converter for 500 mesh →
Application-Specific Recommendations
Paints & Coatings
- Interior Paints: 400-500 mesh (38-25 microns)
- Exterior Paints: 270-400 mesh (53-38 microns)
- Automotive Coatings: 635-800 mesh (20-15 microns)
- Industrial Coatings: 200-325 mesh (74-44 microns)
Plastics & Polymers
- Injection Molding: 400-500 mesh (38-25 microns)
- Extrusion: 270-400 mesh (53-38 microns)
- Film & Sheet: 635-800 mesh (20-15 microns)
- Reinforced Plastics: 200-325 mesh (74-44 microns)
Paper & Textiles
- Printing Paper: 800-1500 mesh (15-5 microns)
- Coated Paper: 635-800 mesh (20-15 microns)
- Textile Fillers: 400-500 mesh (38-25 microns)
- Specialty Papers: 1000-1500 mesh (10-5 microns)
Construction Materials
- Concrete: 100-270 mesh (149-53 microns)
- Mortar: 200-325 mesh (74-44 microns)
- Ceramics: 400-500 mesh (38-25 microns)
- Adhesives: 635-1000 mesh (20-10 microns)
Product-Specific Availability
Calcite Powder
Available in mesh sizes from 200 to 1500
Particle sizes: 5-74 microns (practical)
View ProductDolomite Powder
Available in mesh sizes from 100 to 1000
Particle sizes: 10-149 microns (practical)
View ProductGround Calcium Carbonate
Available in mesh sizes from 100 to 1500
Particle sizes: 5-149 microns (practical)
View ProductQuick Reference Guide
Common Conversions
- 1 inch = 25,400 microns
- 1 mm = 1,000 microns
- Mesh = 25,400 ÷ (mesh size × 0.001)
- Microns = 25,400 ÷ mesh size
Selection Tips
- Smaller particles = smoother finish
- Larger particles = better bulk properties
- Consider processing requirements
- Balance cost vs. performance
Frequently Asked Questions
Example: 400 mesh = 25,400 ÷ 400 = 63.5 microns (theoretical)
Practical Size: 400 mesh = 38 microns (actual particle size)
Note: Practical values are more accurate for real-world applications.
Particle size: Actual diameter of individual particles in microns
Relationship: Higher mesh = smaller particles
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