Softening Point Test
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Vicat softening temperature or Vicat hardness is the determination of the softening point for materials that have no definite melting point, such as plastics. It is taken as the temperature at which the specimen is penetrated to a depth of 1 mm by a flat-ended needle with a 1 mm2 circular or square cross-section. For the Vicat A test, a load of 10 N is used. For the Vicat B test, the load is 50 N.
Standards to determine Vicat softening point include ASTM D 1525 and ISO 306, which are largely equivalent.[1]
The softening point is a test (usually called the ring-and-ball test) to determine the temperatures at which an asphalt binder achieves a specified degree of viscosity.
The vicat softening temperature can be used to compare the heat-characteristics of different materials.
D3461 Test Method for Softening Point of Asphalt and Pitch (Mettler Cup-and-Ball Method) E1 Specification for ASTM Liquid-in-Glass Thermometers. E177 Practice for Use of the Terms Precision and Bias in ASTM Test Methods. E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method. Procedure for Softening Point Test on Bitumen 1. Preparation of test sample. Assemble the apparatus with the rings; thermometer and ball guides in position. Fill the bath with distilled water to a height of 50mm above the upper surface of the rings. Apply heat to the bath and stir the. LP-16 Softening Point Ring and Ball Apparatus determines the softening point of asphalt, coal tar pitch and other viscoelastic bitumens in the range of 30°—157°C (86°—315°F). The unit simultaneously tests two samples for optimal compliance with standard test procedures. The softening point is reported as the mean of the temperatures at which the two disks soften enough to allow each ball, enveloped in bitumen, to fall a distance of 25 mm (1.0 inch) (AASHTO, 2000 1). Softening point sample. Standard Test Methods. AASHTO T 53 and ASTM D 36: Softening Point of Bitumen (Ring-and-Ball Apparatus).
Four different methods may be used for testing.
| Method | Load (N) | Heating rate (K/h) |
|---|---|---|
| A50 | 10 | 50 |
| B50 | 50 | 50 |
| A120 | 10 | 120 |
| B120 | 50 | 120 |
Hp website printer drivers. ISO 10350 Note
Softening Point Of Bitumen
ISO 10350 Vicat values are tested using the B50 method.
Similar Standards: ASTM D1525
References[edit]
- ^Vicat Softening Point: DefinitionArchived April 24, 2010, at the Wayback Machine
The softening point is the temperature at which a material softens beyond some arbitrary softness.[1] It can be determined, for example, by the Vicat method (ASTM-D1525 or ISO 306), Heat Deflection Test (ASTM-D648) or a ring and ball method (ISO 4625 or ASTM E28-67/E28-99 or ASTM D36 or ASTM D6493 - 11). A ring and ball apparatus can also be used for the determination of softening point of bituminous materials.[2]
See also[edit]
References[edit]
Softening Point Test Astm D36
- ^Petrie, Edward (2006). Handbook of Adhesives and Sealants. McGraw-Hill. p. 146. ISBN0-07-147916-3.
- ^'Softening Point / Ring & Ball Apparatus'. http://cooper.co.uk. Cooper Research Technology Ltd. Retrieved 16 July 2015.External link in
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