CLEARLY DIFFERENT! Photomicrographs of polypropylene clearly demonstrate the difference in crystal structure which is achieved by "controlled crystallinity." Photo at left is conventional polypropylene; photo at right is "controlled crystallinity" Pro-fax. Both pictures were taken between crossed polarizers, with a first order retardation plate at 45°. Magnification in each instance is one hundred times.
CONTROLLED CRYSTALLINITY makes Pro-fax a clearly better polypropylene The newest plastic for injection molded use is Hercules' newest type of Pro-fax® polypropylene —with controlled crystallinity. Just as orientation controls the molecular structure and improves the properties of extruded polypropylene, control of the crystal structure within the polymer sign i f i c a n t l y inproves i n j e c t i o n molded parts. Benefits of Hercules' newest Profax: increased clarity, stiffness, surface hardness, impact strength, and resistance to sinks and voids. This clearly better polypropylene
is another example of the constant flow of new and improved materials coming your way from Hercules—pioneer in polyolefins, and leader in plastics research, engineering, and product development. You can profit by evaluating "controlled crystallinity" Pro-fax right now— both for existing applications and projected uses. Complete technical data on request. Call or write the Hercules representative in your area or Polymers Department, Hercules Powder Company, Hercules Tower, 910 Market Street, Wilmington 99, Delaware.
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