8. Preparation of Apparatus
8.1 Thoroughly clean the cup and test tube with mineral spirits conforming to Specification D235. (Warning - Flammable. Vapor harmful.)
8.2 Use only cups that are clean and free from any residue from previous runs. When the interior plating of the cup shows indications of wear, discard.
8.3 When new cups are to be used, check their dimensions by using the cup plug gage (Fig.1). To check the bottom opening a 2.72-mm rod should fit easily while a 2.82-mm rod should not. If the hole is undersized, ream to correct size. If too large, discard.
8.4 Test tube shall be clean and free of residues. Inspect the tube for evidence of chipping or cracking, particularly the points of indentation. Replace when necessary.
8.5 Inspect both cork ring guide and upper cork for charring or distortions in shape. Total clearance between the cork ring guide and the inside wall of the test tube is 1.5 mm. When either cork is abnormal, replace.
8.6 Inspect the bulb end of the thermometer to be used in the test tube. Clean if there is any residue build-up.
