Paragraph 9 Leaching and volumetric leakage assessment methods
For specimens which comprise or simulate indispersable solid material, a leaching assessment shall be performed as follows:
The specimen shall be immersed for 7 days in water at ambient temperature. The volume of water to be used in the test shall be sufficient to ensure that at the end of the 7-day test period, the free volume of the unabsorbed and unreacted water remaining shall be at least 10% of the volume of the solid test sample itself. The water shall have an initial pH of 6–8 and a maximum conductivity of 1 mS/m at 20°C.
The water with specimen shall then be heated to a temperature of (50±5)°C and maintained at this temperature for 4 hours.
The activity of the water shall then be determined.
The specimen shall then be stored for at least 7 days in still air of relative humidity not less than 90% at 30°C.
The specimen shall then be immersed in water of the same specification as in (a) above and the water with the specimen heated to (50±5)°C and maintained at this temperature for 4 hours.
The activity of the water shall then be determined.