Cold Curing Research Articles

High Resilience Cold Cure Foam— a Pilot Plant Investigation

High Resilience Cold Cure Foam— a Pilot Plant Investigation

Durability Of Impregnation Products For SaltContaminated Natural Stones

To retard the deterioration of porous natural stones, new classes of cold curing polymer products have been developed. The presence of salts can reduce the long-term durability of the products. A test concept is presented which allowes to estimate the long-term durability of polymer impregnation materials in the case of salt contamination. First tests are carried out with Ebenheider Sandstone, contaminated with sodium chloride or gypsum and impregnated with two polyurethan-based products (one hydrophobic, one not). Results are given and discussed in detail. It turns out that the test concept allows to estimate critical salt concentrations for impregnation.

The heat of polymerization of room temperature curing resins.

Equipment is described for the measurement of heat of polymerization of ‘cold curing’ plastics. Opposed thermocouples measure the difference in temperature between the specimen and a reference material of known properties. The equipment permits the rapid comparison of new materials with those already used as dental cements and forin vivo applications.

Colorimetric determination of chlorpheniramine maleate with chlorocyan and 1-phenyl-3-methyl-5-pyrazolone

Application of cyanogen chloride and 1-phenyl-3-methyl-5-pyrazolone to chloropheniramine maleate results in reddish violet coloration and the solution has absorption maximum at 550 mμ. By using this coloration reaction, colorimetric determination of chloropheniramine maleate was examined and a sensitive method was established in which adverse effect of existing substances was minimized. By the use of this method, the usual substances compounded in ordinary cold cures such as sulpyrin, aminopyrine, acetylsalicylic acid, 4-hydroxyacetanilide, phenacetin, caffeine, guaiacol glycerol ether, methylephedrine hydrochloride, and dihydrocodeine phosphate would not interfere in the determination even if present in 75 volumes of chloropheniramine maleate, and noscapine in 15-fold amount. On the other hand, pyridoxine hydrochloride affects the determination even in 3-fold amount and riboflavine causes negative error if present in one-half the amount of chloropheniramine maleate. These interferences can be removed by extraction of chloropheniramine with petroleum ether in ammonia alkalinity. Concentration range of chloropheniramine maleate determinable by this method is 100∼500 μg./5 ml., and precision of measurement is σ^^^= 1.54% (n=6).

Construction of plastic registration trays

With the use of cold curing acrylic resin and commercially available screws and nuts, the time necessary for constructing registration trays is less than is required for other methods; no special instruments are necessary. The “split trays” are easy for the dentist to handle and comfortable for the patient. These registration trays combine the accuracy of cast aluminum with the simplicity and economy of self-curing acrylic resin. Outlining the border of the registration tray with strips of wax facilitates its construction and saves time in finishing procedures.

Untersuchungen über die Einflüsse verschiedener Faktoren auf die Viskosität und Bindefestigkeit von Holzleimen auf Kunstharzbasis.—Zweite Mitteilung: Die Abhängigkeit der Bindefestigkeit von Harnstoff- und Melamin-Formaldehyd-Harzen von Viskosität, Konzentration und Streckmittelzusatz

The influence of various basic factors regarding the viscosity and bonding strength of phenol-, melamine and ureaformaldehyde resins was investigated. Summarizing the results revealed some important conclusions contributing considerably to the knowledge of rheologic behaviour of synthetic resins. Remarkable is, that the influence by the aging of the resin improves decisively the bonding strength of an inert glue, while adding, strong acids to the cold curing synthetic resin causes an remarkable reduction of the bonding strength.

Recipe for a Cold Cure

Recipe for a Cold Cure

Regarding “Cold Cures”

Regarding “Cold Cures”

ASSESSMENT OF " COLD CURES "

ASSESSMENT OF " COLD CURES "

The Development of Flavor in American Cheddar Cheese Made from Pasteurized Milk with Streptococcus Faecalis Starter

Summary A strain of Streptococcus faecalis which rapidly fermented lactose was isolated. It was used as a starter for American Cheddar cheese made from pasteurized milk of excellent quality. The S. faecalis starter produced acid in milk somewhat slower than a commerical lactic starter but rapidly enough for cheese making. The cheese made with S. faecalis developed a normal acidity, slightly lower total volatile acidity, and the same water-soluble protein level as did cheese made with a commercial lactic starter. More Cheddar flavor of better quality developed in the cheese made with S. faecalis , and the body of the cheese was more mellow and waxy than the cheese made with lactic starter. American Cheddar cheese with the best flavor of highest intensity was made by using both commercial starter and S. faecalis starter in the same pasteurized milk. The flavor was pronounced, clean, good Cheddar but not snappy. S. faecalis starter hastened the ripening of Cheddar cheese. A well-ripened cheese of medium flavor intensity was produced in 4.5 months at 50° F. and in 2.5 months at 60° F. when S. faecalis starter was used with the usual lactic starter. With commercial lactic starter, the same approximate intensity of flavor, of lower quality, was developed in 7 months at 50° F. and in 4.5 months at 60° F. The results indicate that after these curing periods, the cheese should be held at cold curing temperatures.