Standard Test Method for Flash and Fire Points of Asphalt by Cleveland Open Cup Tester

Importancia y uso:

5.1 The flash point is one measure of the tendency of the test specimen to form a flammable mixture with air under controlled laboratory conditions. It is only one of a number of properties that should be considered in assessing the overall flammability hazard of a material.

5.2 Flash point is used in shipping and safety regulations to define flammable and combustible materials. Consult the particular regulation involved for precise definitions of these classifications.

5.3 Flash point can indicate the possible presence of highly volatile and flammable materials in a relatively nonvolatile or nonflammable material.

5.4 Skin prevention technique involves assembling a restraining ring over a centrally-holed qualitative filter paper that is laid at the bottom of the COC (Cleveland open cup) test cup, prior to introduction of the sample specimen into the cup. This allows a column of the hot sample specimen to move up constantly, through the hole, to the surface of the test specimen so that the surface is maintained in the hot condition to prevent skin formation. (See 9.6).

5.5 Skin-forming asphalts may not be limited to those which are air blown/oxidized, polymerized or non-homogeneous materials that, although infrequently, exhibit some unique behavior and characteristics, as far as manifestation of flash point is concerned. At the flash point stage, this behavior may involve flame propagation across the surface or just a flame appearing at one or more points on the surface.

5.6 This test method shall be used to measure and describe the properties of materials, products, or assemblies in response to heat and a test flame under controlled laboratory conditions and shall not be used to describe or appraise the fire hazard or fire risk of materials, products, or assemblies under actual fire conditions. However, results of this test method may be used as elements of a fire risk assessment that takes into account all of the factors that are pertinent to an assessment of the fire hazard for a particular end use.

5.7 The fire point is one measure of the tendency of the test specimen to support combustion.

Subcomité:

D04.47

Volúmen:

04.03

Número ICS:

13.220.40 (Ignitability and burning behaviour of materials and products), 75.080 (Petroleum products in general)

Palabras clave:

asphalt; Cleveland open cup; fire point; flammability; flash point;