Acetal copolymers can be rotationaily molded into a wide variety of shapes and sizes, using conventional grinding and rotational molding equipment. Celcon M15HP acetal copolymer is one such grade that was recently developed by Ticona to offer substantially improved physical, mechanical and thermal properties over general purpose grades of acetal copolymer. In particular, it exhibits higher tensile strength, flexural modulus, impact resistance, heat deflection, fatigue endurance, abrasion resistance and surface hardness. Because of its extremely low permeability to gasoline and alcohol, along with its excellent long-term chemical resistance and dimensional stability, acetal copolymer is currently being evaluated as a potential fuel permeation barrier to meet proposed GARB and EPA evaporative emissions regulations for small off-road engine and marine fuel tanks, which are found in numerous products manufactured by the Lawn & Garden, Outdoor Power Equipment, Recreation Vehicle and Marine industries. This paper will presen some basic guidelines for the rotational molding of acetal copolymer, along with some techniques for data generation and analysis using six-sigma methodology, which have enabled us to optimize the rotational molding process around this material.
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