Cultivation substrates are sold on a volumetric basis, but due to their nature as composite materials, i.e. consisting of a solid, a liquid and a gas phase, they are subject to volume changes resulting from the processes that take place between production and consumption, essentially, in the storage and transportation phases.
For this reason, some methods have been developed to allow the repeatable evaluation of the apparent volume of the material.
In Vigorplant, we use the method introduced by the European Union, EN 12580, and also incorporated in 2002 by the UNI Italian National Unification Body. We can therefore determine the quantity (volume) of substrate that is sold both in bulk and in packages.
Materials are weighed in a container of known volume, the apparent volume mass is then determined, and the volume is finally calculated from these same values.