A n o t h e r success story
of S h a w i n i g a n acetal resins
structural adhesives Shawinigan Resins" Butvar (polyvinyl butyral) a n d F o r m var (polyvinyl formal) are used in the manufacture of adhesives for the construction of honeycomb sandwich panels and for bonding metal-to-metal. In aircraft, adhesives based on the acetal resins form a stronger bond, simplify construction techniques, and reduce overall aircraft weight. Butvar or Formvar in combination w-ith a thermosetting resin provides a structural adhesive of exceptional strength, resistance to shear and peel, and with flexibility which withstands vibration fatigue. They have been used and proved in aircraft construction. This is just one illustration of how acetal resins are oeing used to advantage in industry. These versatile resins might be the answer to your product improvement problem. Polyvinyl acetal resins, Butvar and Formvar, are un usual polymers because they contain three different func tional groups distributed in the molecular chain. Available in a variety of molecular weights and chemical composi-
F O R M V A R ^ polyvinyl B U T V A R " polyvinyl
farmai
tions, the acetal resins are compatible with a wide range of resins and plasticizers. This variety of grades allows users great flexibility in the choice of solvents. Under suitable conditions Butvar and Formvar are re active with phenolics, melamines and other thermosetting resins, and, even in fairly minor quantities, impart signifi cantly improved adhesion, toughness and flexibility. Why not put these unique properties to work in your product. We'll be iilad t o help. Wriie for full information and product literature to Shawinigan Resins Corporation η — * JL/cpi.
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Shawinigan does not produce structural adhesives . . . we supply acetal resins which make them possible. **'T.ES
SHAWINIGAN
and
butyral resins
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