DATA · GLOSSARY · PROCESSING

What is expansion ratio?

Coir glossary · Updated 2026-09-22

Volume of hydrated substrate obtained per kilogram of dry compressed coir product. Fine coir pith: approximately 15 L/kg. Medium grade: 14 L/kg. Coarse grade: 13 L/kg. The expansion ratio determines how many liters of ready-to-use substrate a container load of compressed product yields and is a key factor in delivered cost per liter.

Expansion ratio: equivalents.

PT: taxa de expansão · ES: relación de expansión

Source: Romero. Definition from the Carve coir glossary, where the full source list is given.

Related terms.

Retting: Traditional method of soaking coconut husks in water for weeks to months before fiber extraction.

Dry mechanical processing: Method of separating fiber and pith from coconut husk using mechanical equipment without prior water retting.

Washing: Passing fresh water through coir pith to remove soluble salts — primarily potassium (K+), sodium (Na+) and chloride…

See also: Coir pith from Brazil: specification checklist · back to the coir glossary.

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About this page. Part of the coir glossary maintained by Carve Biorrefinaria Agroindustrial Ltda, a coir pith and fiber producer in Paraipaba, Ceará, Brazil. Corrections: [email protected].