Manual of basic techniques for a health laboratory - libdoc.who.int

2. Setting up a peripheral health laboratory 41Fig. 2.48 Flattening the heated end of the glassrod using a weightFig. 2.49 Pressing the heated end of theglass rod down on a tiled surfaceFig. 2.50 Heating glass tubing before bendingFig. 2.51 Bending glass tubing to make a right angleBending glass tubing1. Heat the spot where the bend is to be made, rotating the tubing over the flameuntil the glass turns pale red (Fig. 2.50) and sags.2. Bend the heated tubing slowly to make a right angle (follow the corner of a tile;Fig. 2.51).Poor bends (Fig. 2.52)Poor bends may result if:— the glass was too hot (a)— the glass was not hot enough (b).Making a wash bottleMaterials●●●Erlenmeyer flask, 1000mlTwo pieces of glass tubingCork or rubber stopper.Fig. 2.52 Common problemswith bending glasstubing