2207 International Standard (ISO INTERNATIONAL ORGANIZATION FOR STANDARDIZATION MEKAYHAPOAHAR OPFAHW3AUMA IO CTAHAAPTW3AUWWORGANISATION INTE RNATIONALE DE NORMALISATION Petroleum waxes - Determination of congealing point Cires de petrole - Détermination de la temperature de figeage First edition - 1980-12-01 2207-1980 (E) UDC 665.772 : 536.421.4 Ref.No. ISO 2207-1980 (E) Descriptors : petroleum products, oil waxes, petrolatum, tests, determination. Foreword ISo (the International Organization for Standardization) is a worldwide federation of national standards institutes (iso member bodies). The work of developing Inter- national Standards is carried out through ISO technical committees. Every member body interested in a subject for which a technical committee has been set up has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with isO, also take part in the work. Draft International Standards adopted by the technical committees are circulated to the member bodies for approval before their acceptance as International Standards by the ISO Council. International Standard ISO 2207 was developed by Technical Committee ISO/TC 28, Petroleum products and lubricants, and was circulated to the member bodies in December1979. It has been approved by the member bodies of the following countries : Australia Egypt, Arab Rep. of South Africa, Rep. of Austria Germany, F. R. Spain Belgium Hungary Sweden Brazil India Turkey Bulgaria Israel United Kingdom Canada Netherlands USA Chile Peru USSR China Poland Venezuela Czechoslovakia Romania No member body expressed disapproval of the document. C International Organization for Standardization,1980 Printed in Switzerland INTERNATIONALSTANDARD ISO 2207-1980 (E) Petroleum waxes s - Determination of congealing point Scope and field of application 5 Procedure 1 1.1 This International Standard specifies a method for the 5.1 Adjust the thermometer through the stopper so that the determination of the congealing point of petroleum waxes, in- bottom of the bulb will be 10 to 15 mm above the bottom of the cluding petrolatum. conical flask when the stopperis fitted snuglyin the flask.After making this adjustment, remove the thermometer and stopper from the flask, being careful not to change the position of the 1.2 The congealing point of a wax is a property of interest to stopper relative to the thermometer stem. manypetroleum wax consumers.The procedure specified in this International Standard allows determination of the 5.2 Place approximately 50 g of sample representative of the orresistancetoflow.Atthattemperature,thewaxmaybe ator material under inspection, in a porcelain evaporating dish or close to the solid phase, or it may be semi-solid and quite unc- other suitable container. tuous, depending on the composition of the wax or petrolatum being tested. In the case of petrolatums, congealling IS 5.3 Place the empty conical flask (without the thermometer associated with the formation of a gel structure as the sample assembly)and the container holding the sample in a cools. temperature-controlled oven set at 99 ± 3 C until the sample and flask reach oven temperature. NOTE This International Standard is an alternative to ISO 6244, Petroleum waxes - Determination of drop melting point. Results ob- tained are usually lower than the results obtained by ISO 6244, the NOTE - For non-referee, routine testing of samples known to have amount of deviation varying with the nature of the petroleum wax low congealing points, the oven may be set at a lower temperature, but it should be at least 11 oC above the expected congealing point of the sample. 2 Definition 5.4 Remove the sample from the oven and completely im- congealing point : The temperature, determined by a stan- merse the thermometer bulb in it without covering any part of dardtest,atwhichmoltenpetroleumwaxceasestoflow. the thermometer stem with sample. Gently stir the sample with the