Kaaluklaas koos kaanega (vt p 3.2) (eraldi) kuumutatakse kuivatuskapis (vt p 3.1) ühe tunni kestel 103 +- 2 °C juures. Jahutatakse eksikaatoris (vt p 3.3) toatemperatuurini. Suletud kaaluklaas kaalutakse. Seejärel kaalutakse kaaluklaasi ligikaudu 10 g proovi. Asetatakse kuivatuskappi üheks tunniks 103 +- 2 °C juures.
Usual laboratory equipment and, in particular, the following: ... 4.2. Drying oven, well ventilated, capable of being maintained thermostatically at 102 ± 2 °C throughout the working space.
Before use measure the real amount of water by Karl-Fisher or remove the additional moisture by placing lactose in an oven at 105 °C for 8 hours (the lactose does not lose its crystal water by this treatment).
