Pratt.] BRIQUETTING TESTS. 143 
California asphalt, Bl. — This asphalt is brittle at ordinary tempera- 
tures and can be readily disintegrated. At 212' V. it softens slightly, 
and it is soft and very sticky after melting. This asphalt mixes 
readily with the Spindletop (Tex.) petroleum, PI, and the residual 
product of Beaumont petroleum, P2, in all proportions, and can there- 
fore be thinned to any consistency. A series of experiments was made 
with this asphalt, which indicates that to obtain the best results it 
would be necessary to heat the mixture with superheated steam or to 
add crude oil. 
Asphalt product (kopak), Iti. — This Texas asphaltic compound is of 
a rubbery consistency at ordinary temperatures, and at 212° F. only 
softened slightly without becoming sticky. It melted at a rather high 
temperature, was still rubbery, but very adhesive. Alone it can not 
be disintegrated readily, but in a cold temperature it can with some 
care be crushed. It is not affected by the crude Spindletop (Tex.) oil, 
1, or the residual petroleum from the Beaumont district, P2. With 
he warm asphaltic pitch it mixes readily, and but little of this pitch is 
eeded to make a soft and sticky mass. With ordinary coal-tar 
itches this asphaltic compound will not mix at all. With rosin the 
ubbery asphalt mixes readily, and the resulting product can be 
racked easily, and it is very strongly tenacious and somewhat elastic. 
his asphalt has the qualities that should make it a desirable binder, 
md it may be found useful in briquetting lignites. 
msphaltic pitch, BS. — This asphaltic pitch, made by the Standard 
3il Company at one of its Texas plants, was found to have excellent 
hiding qualities and to be of the right consistency to work easily. 
t makes a tough and elastic briquette, but apparently it does not give 
he degree of hardness that can be obtained from the pitches made 
rom coal tar. 
A series of experiments was made with this pitch in combination 
yith rosin. The briquettes made from 4 per cent asphaltic pitch and 
\ per cent rosin and from 3 per cent pitch and 3 per cent rosin were 
>f equal value; but as the 3 to 3 briquette would probably be the 
heaper, it has been adopted as the standard ratio for this asphaltic 
)itch and rosin. 
Indian T< rritory asphalt, Blf. — This asphalt does not soften at all 
a boiling water, even when tested as powder. It melts to a stiff, 
ticky liquid rather suddenly just below its ignition point, which is at 
very high temperature. It is only slightly soluble in gasoline. At 
e boiling point there is apparently no reaction between this hard 
sphalt and crude Kansas petroleum, P3, or the Spindletop oil, PI, or 
he Beaumont residual petroleum, P2. Neither is there any apparent 
ction between this asphalt and melted rosin. With creosote it 
oftened materially, and when used in the ratio of 5 per cent of each 
ith Arkansas coal a fair briquette was obtained. Witli Pintsch gas 
