Particle Size

The size of solid particles in the mud system is measured in microns. A micron(µ) is 1/1000 of a millimeter or 1/25400 of an inch. API classification of particle sizes is as below:

Particle Size, microns(μ) Particle Classification Sieve Size

Greater than 2000 Coarse 10

2000 to 250 Intermediate 60

250 to 74 Medium 200

74 to 44 Fine 325

44 to 2 Ultra-Fine 400

Less than 2 Colloidal –

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