ASTM D1665 Test Method for Engler Specific Viscosity of Tar Products
4. Summary of Test Method
4.1 The time, in s, is measured for a fixed volume of liquid material to flow through an efflux tube under an accurately reproducible head and at a closely controlled temperature. The Engler specific viscosity is then calculated by dividing the efflux time by the viscometer calibration factor as determined by making the same efflux measurement for water.
5. Significance and Use
5.1 This test method is useful in characterizing the consistency of tar and tar distillates by measuring their flow properties. It is applicable to materials that are readily liquid at temperatures up to 100°C.
