Drop melting point

The method of determining the drop melting point of petroleum wax, including petrolatum (ASTM D127, IP 133) can be used for most petro-... 

Figure 7.22 Laterally resolved ellipsometry profile showing an AKD precursor that spreads out from the foot of a macroscopic AKD drop (melting point <10 C), which has been put in contact with a silica surface. The inset shows schematically the spreading of an autophobic precursor from the foot of the AKD droplet. (From ref. (24) with permission)...

Obviously then, any situation where an alkyl phosphoric add ester-hydrocarbon mixture is liquid or even partially liquid will lead to some measure of selective migration into the powder and therefore antifoam deactivation. Such situations could occur during periods of storage of the powder at elevated temperatures or when the antifoam is sprayed directly onto hot powder immediately after production from a spray-drying tower, as described by Curtis et al. [35]. The antifoam exemplified in this patent consisted of a mixture of a commercial (Cig-Cig) alkyl phosphoric acid monoester and a petroleum jelly, which is a hydrocarbon gel at ambient temperatures with a carbon number >25. Mixing petroleum jelly with the phosphoric acid monoester in the preferred ratio of 1 3 by weight produces an effective antifoam precursor with a drop melting point of 58°C. Curtis et al. [35] describe both full-plant scale... 

The drop melting point is the temperature at which a material (usually a wax) becomes sufficiently fluid to drop from the thermometer used for the determination under controlled conditions (specified in ASTM D127-08 Standard Test Method for Drop Melting Point of Petroleum Wax, Including Petrolatum ( petroleum jelly )). 

Waterproofing Cable Jelly (cont) synthetic polyisobutene drop melting point 84°C 70 16 6 Data from 1989 SPE ANTEC Conference Proceedings 2.1 96 Tensile yield strength measured 50 mm/ min per ASTM D638 Specimen Density - 0.935, MI-0.25, 1 mm (0.04 in) thick compression molded ASTM D638 specimen... 

D 127 Test Method for Drop Melting Point of Petroleum Wax, Including Petrolatum. ... 

In 1963, the title, scope, and definition were changed to define the determination of drop melting point Sections on procedure, report and precision were revised, and a new section on significance was added. 

Melting point is a wax property that is of interest to most wax consumers. It can be an indication of the performance properties of the wax. Drop melting point, Test Method D 127, is often used to measure the melting characteristics of petrolatums and other high viscosity petroleum waxes. 

Note 2—A dipping temperature of 11 C (20 F) above the congealing point in accordance with Test Method D 938 usually will be 6 to 11 C (10 to 20 F) above the actual drop melting point. 

Report the average of the two determinations as the drop melting point of the sample under test. 

Bias—The procedure in this test method has no bias because the value of drop melting point can be defined only in terms of a test method... 

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