Static, clumping, and RDT

How static and clumping affect grind consistency and how the Ross Droplet Technique (RDT) can mitigate these issues.

Coffee Basics Nerds avatar
  • Coffee Basics Nerds
  • 1 min read
Article 6 of 12 in Grinding Science & Technology/
Static, clumping, and RDT

Key Concepts

  • Static Electricity:

  • Coffee grounds can build up static when passing through the grinder.

  • Static causes grounds to scatter or stick to surfaces, making dosing messy and inconsistent.

  • Clumping:

  • Fine particles sticking together due to static or moisture.

  • Leads to uneven extraction in espresso or manual brewing.

  • RDT (Ross Droplet Technique):

  • Involves lightly misting beans with a small amount of water before grinding.

  • Reduces static and prevents clumping.

  • Helps achieve a more uniform grind size distribution and cleaner dosing.

  • Implementation Tips:

  • Use a spray bottle to mist beans evenly (just a few drops).

  • Avoid over-wetting to prevent extraction issues.

  • Combine RDT with proper grinder cleaning to maintain consistency.

Summary

Managing static and clumping through techniques like RDT enhances dosing accuracy, grind uniformity, and ultimately leads to better coffee extraction and flavor consistency.

Comment

Disqus comment here

Coffee Basics Nerds

Written by : Coffee Basics Nerds

Expert coffee historians and brewing enthusiasts dedicated to sharing the rich heritage and techniques behind your perfect cup of coffee.

Recommended for You

Retention and single-dosing

Retention and single-dosing

How grinder retention affects freshness and consistency, and the principles behind single-dosing strategies.

Burr geometry and cutting angles

Burr geometry and cutting angles

How the shape and angles of burrs influence grind efficiency, particle size distribution, and flavor extraction.

Scaling from sample to production

Scaling from sample to production

This topic explains how to translate insights from sample roasts into consistent full-batch production profiles.

Grind distribution and fines

Grind distribution and fines

How the particle size distribution, particularly fines, affects extraction uniformity and flavor.