Insoluble or practically insoluble - definition

Insoluble or practically insoluble materials are those, which do not or almost don't dissolve. Usually materials are treated insoluble if 1g of material requires more than 10.000ml of solute to dissolve or does not dissolve in any amount whatsoever. Insoluble and practically insoluble are often put together because if 1g is dissolved in 10.000ml of solvent than it is almost non existent in it.