Precondition the LOD dish at 1055ºС for 30 minutes. Cool to room temperature in dessicator over diphosphorous pentoxide. Weigh the cooled LOD dish and note down the weight (W1).
Weigh 1.0 g of the substance being examined, note down the weight of LOD dish and sample (W2). Carefully apply the pressure not exceeding 0.7 kPa for 24 hours. After 24 hours slowly release the vacuum and weight the LOD dish and note down the weigh (W3).