The objective of this test is to obtain the temperature level of the asphalt materials for flash and fire point. This is to know its optimum temperature level. The flash point of cut back asphalt is generally determined by the use of a Tagliabue Open Cup apparatus, whereas the Cleveland Open Cup is used for flash point determination on other asphaltic materials.
This experiment covers the determination of the flash and fire of all petroleum products except fuel oils and those having an open cup flash below 79°C. This test is significance to its purposes. Usually, the result of this test may be used as an element of the fire risk assessment, which takes into account all of the factors, which are pertinent to an assessment of the fire, hazard of a particular end use.
The flash point of cutback asphalt is generally determined by using a Tagliabue Open Cup apparatus, whereas the Cleveland Open Cup is used for flash-point determinations on other asphalt materials. The two methods are essentially the same, although in the Cleveland Open Cup, the asphalt is heated in a metal container suspended in an air bath, whereas in the Tagliabue Open Cup, heating takes place in a glass cup held in a water bath.
In both methods, the temperature of the asphalt material is gradually increased at a uniform rate. As the temperature rises, a small, open flame is passed at specified intervals across the surface of the heated material. Volatile constituents of asphalt are driven off as the temperature increased. As the test proceeds, a point will be reached where sufficient volatiles will collect at the surface of the heated asphalt to briefly ignite and cause a distinct flicker or flash across the surface of the material. The minimum temperature which the yellow flames occur is called the flash point and the minimum temperature which the asphalt started to burn (blue flames occur) is the fire point.
The standard flash and fire test should be used to measure and described the properties of materials, products, or assemblies in response to heat and flame under controlled laboratory conditions, and should not be used to described or applies the fire hazard or fire risk of materials, products or assemblies under actual fire conditions. However, results of this test may be used as elements of a fire risk assessment, which take into account of the factors, which are pertinent to an assessment of the fire hazard of a particular end used.
The apparatus used in this test is:
(a) Cleveland Open Cup Apparatus:
· This apparatus consists of the cup, heating plate, test flame applicator, heater, and support.
· A shield 460 mm (18 inch) square and 610 mm (24 inch) high and having an open front is recommended.