Which of these 2 Hercules water soluble polymers meets your needs best? Hercules® CMC sodium carboxymethylcellulose reacts with aluminum ions to produce a wide range of gel character istics from soft to a rigid gel. Natrosol® hydroxyethyl cellulose, on the other hand, is inert to cations as the test on the right indicates. In the pres ence of even a relatively high concentra tion of alum the Natrosol solution re mains smooth, clear and free-flowing, and has no tendency to gel even on heat ing to the boiling point. Result: A choice of water soluble poly mers to meet a wide variety of needs. CMC is offered in a wide range of grades for those who may recjiiire a thixotropic or nonthixotropic type, need a variation in viscosity, degree of substi tution, particle size or solubility. Na trosol is available in four viscosity types to suit it for use as a thickener, protective colloid, binder or film former. Both CMC and Natrosol are superior to other water soluble polymers in many uses, resulting in an ever increasing num ber of applications over many different fields. Possibly they offer the answer to one of your own problems. Full technical data on both CMC and Natrosol are available from Hercules to help you in evaluating their usefulness in your own formulations. Why not send for this in formation now?
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Flask holds a 10% alum solution. Left hand beaker contains 1% Hercules CMC. Right hand beaker contains 1% Natrosol. Alum solution is permitted to run slowly into both the CMC1 and Natrosol solutions. Note gel starting to form in the CMC beaker as the cation concentration increases.
THE CMC has formed an almost rigid gel, capable of holding a stirring rod upright. C M C should be specified where a thickening char acteristic is desired.
HERCULES
POWDER,
THE NATROSOL solution in the upper right hand beaker remains smooth and free flowing . . . making it the choice of users who require this alternate property.
COMPANY
Cellulose and Protein Products Department Hercules Tower, 910 Market Street, W ilmington 99, Delaware
VC61-7
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