Freezing element - 707753Product: Freezing element, HENDI, GN 1 1, 530x325x(H)35mm Description of item: Made of HDPE. Contains water and ammonium chloride. Suitable for thermoboxes. Keeps the temperature between 15 to 10C for 4 to 5 hours. Before use: freeze at 18C for at least 12 hours or until frozen solid. To check if ready, shake the element and when you feel and hear nothing moving inside its ready. The HENDI Freezing element is a reusable cooling block for thermoboxes