| Petropol No. 1158 liquid | Petropol No. 2138 liquid | |
|---|---|---|
| Gravity | 15.5-18.5 | 10-11 A. P. I. |
| Flash | 175° F. minimum. | 230° F. minimum. |
| Fire | 215° F. minimum. | 280° F. minimum. |
| Viscosity | 200-225 at 212° F. | 225-300 at 210° F. |
| Pour | 0° F. maximum. | 45° F. approximate. |
| Iodine No. | 195 minimum. | 200 minimum. |
| Molecular weight | 300 approximate. | 425 approximate. |
| Percent solids | 60-65. | 80-85. |
Miscible in all proportions with petroleum solvents.
Petropol No. 1158 is used by core oil makers to replace such vegetable oils as linseed, tung, and perilla. It is used also as a binder and waterproofing agent on rock wool insulation, replacing rosin and mineral oil. For spraying coal to minimize dusting, it has the advantage over calcium chloride of increasing the B. t. u. content of the fuel.
Petropol No. 2138 is a surface coating material which dries by polymerization. A low cost paint is obtained by combining a pigment and a plasticizer with the resin. Such paint dries in about one-fourth the time of linseed oil paints, adheres better to metal, and has greater resistance to water, acids, and alkalies. In varnishes and enamels it replaces 12 to 15 percent of tar-acid resin, minimizes skinning, and gives a higher luster and better flow. Another use of this Petropol is as a binder in brake linings, replacing certain tar-acid resins.
These two Petropol resins are among the lowest priced synthetics, selling at present (1938), in tank carlots, for 2 to 5 cents per pound.
The Santoresins are clear, hard, neutral products, melting at 100° C. They are soluble in drying oils, accelerate the gelatination of tung oil, are nonreactive with pigments, do not yellow on outdoor exposure, and are resistant to alkalies, acids, alcohol, and water. Applications are in protective coatings for wood, metal, paper, leather, cement, plaster, and other materials, in printing inks, plastic tile, linoleum, and fiber packages. Being odorless and tasteless they may be used to line food containers. Their high resiliency and purity recommend their use as a base for chewing gum. Other uses are as an agent for wetting and dispersing pigments in rubber and in surface coatings, to replace ester gum or modified tar-acid resins.
At present the Santoresins are offered at 15 cents per pound in lots of 20,000 pounds or more. Their approximate specifications are:
| Appearance | A clear hard resin. |
| Melting point | 110° to 120° C. A. S. T. M. (Ring & Ball). |
| Acid value | 0 to 1. |
| Iodine value | 125 to 135. |
| Specific gravity (at 20° C.) | 1.02 or 8.5 lbs. per gallon. |
| Color (50 percent solution by weight in toluol) | 13 to 15 Gardner Holt standard. |
Odor slight when cold, sweet and aromatic when melted. Soluble in aromatic hydrocarbons, petroleum thinners, turpentine, and varnish oils. Insoluble in alcohols, esters, ketones, and not completely compatible with nitrocellulose.