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Frequently Asked Questions (FAQ)*Why are polyurethanes not as popular as thermoplastics?The market for polyurethanes is a specific market destined for professional producers. The consumers seldom buy the polyurethane products directly. However, polyurethanes can be found in many of the end products being sold in the market, from kitchen utensils to urban equipment, and from automobiles to office furniture. Is it difficult to design products that will use RIM polyurethane technology?For industrial designers with a knowledge of thermoplastics design it will be easy to "migrate" to design in polyurethanes. PURMOLD provides technical assistance to industrial designers who wish to optimise their projects with the use of polyurethane systems. [Go back to top]How expensive is the production of polyurethane parts?The price for complex designs is often highly competitive when compared with that of the traditional materials for production series above 100 parts, and with molded thermoplastics for series between 100 to 5000 parts. Are polyurethane parts mechanically resistant to impact?Yes. Rigid foam polyurethane with density of 0,6 has a medium resistance to impact, but rigid solid polyurethane has the same impact resistance as thermoplastics. Are the dimensional tolerances low or high?The dimensional tolerances of polyurethanes are equivalent to the tolerances of thermoplastics, allowing for accurate control of binding and assembly systems. How do surface paint applications work and look in polyurethane parts?The polyurethane adhesion to the paint is excellent. Is it possible to insert materials inside the polyurethane (e.g. inner-structures)?Yes. It is possible, and many times desirable, to insert other materials inside polyurethane parts. The main reasons to insert other material inside the polyurethane (moulding inserts) are the following: Is it possible to fit metallic threaded inserts?Yes. Inserts have an external thread that binds strongly to the polyurethane part and resists to high tension forces. Is it possible to fit screws in the polyurethane?Yes. Self tapping screws for permanent fitting are available whenever it is necessary to unscrew several times. Threaded inserts must be fitted. [Go back to top]
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