How Good Can A Resin Be? With Statistical Quality Control, Hercules has been able to make good resins even better. There is promise, too, of continually improved resins, since quality control enables specification limits to be narrowed.

One result of quality control is the even higher standard of uniformity obtained for Hercules Pentalyn* Resins. Derived from rosin, the "Pentalyns" offer a series of syn­thetic resins—each resin developed for specific needs and differing widely in chemical and physical properties, yet each consistent in its individual characteristics, batch after batch.

We would like to tell you more about Hercules synthetic resins and what Statistical Quality Control has done to improve their usefulness in solving your processing problems. HERCSULBS POWDER COMPANY !M2 Market Street, Wilmington, Delaware

Soles Offices in Principal Cities

. . . resins with α uniformity and con­sistent quality entirely new to the chemical industry. Customers now can select resins with the same confidence they select any chemical bought on a strict purity basis.

Versatile N e w Ether Hydroxyethyl Cellulose is an alkau-soluble, water-insoluble cellulose ether of good film-forming properties. Den­sity 1.49 gm/cc and refractive index 1.534. In film form, at 25°C. Hydroxy­ethyl Cellulose is a white, tasteless, odorless, fibrous solid, insoluble in all common organic solvents, oils, fats, and greases; soluble in alkalies — e.g. 2% to 18% NaOH; 5% to 18% ΚΟΗ. This new material is suitable as a starch re­placement in flotation, a thickener for alkaline adhesives and resin solutions, a filler for thermosetting resins, a binder for paper coatings, a permanent size in textiles and a toughener for floes used in water treatment. Other possible applications include textile printing media, inks, leather coatings. Two vis­cosity types are available.

Microlab Speeds Research With the addition of a new microana-lytical laboratory to Hercules' research facilities, Hercules' chemists now are able to obtain data which otherwise could not be achieved without repeating syn­theses on a large scale. In the new lab, midget-sized micro flasks, funnels and crucibles yield accurate data in grams to the fifth and sixth decimal places. Air is filtered free of dust and kept at a constant 70° temperature and 50% relative humidity, thus eliminating errors arising from variations in these condi­tions.

Resin Emulsion Stabilizer Hercules'^ CMC (cellulose gum) is used with considerable success as a thicken­ing agv nt and stabilizer in rubber latex-based water paints; and to stabilize emulsion paints and lacquer emulsions. Viscosity in resin emulsion paints is easily controlled with CMC, and pigment sus­pension properties are improved — par­ticularly after the paint has been thinned for application. CMC is also a useful a id in wetting pigments in aqueous pig­ment dispersions for leather and other products.

Meet This N e w Film Producer Hercules has developed a finely pow­dered metal casemate which in ammo­niacal solution readily forms a metal ammonium casein complex. Upon drying, the complex is broken, and an insoluble metal casemate film is obtained. This film exhibits exceiient water resistance and adhesive properties for pigments to many types of surfaces.

OSIN AND ROSIN DERIVATIVES · CHLORINATED PRODUCTS · AND OTHER CHEMICAL MATERIALS FOR INDUSTRY GC50-6

4079 V O L U M E 2 8, N O . 4 7 . N O V E M B E R 2 0, 1 9 5 0

l*ESULT.w