UV Radiation UV radiation from sunlight will degrade plastics over time. Polymer photodegradation occurs when non-visible UV radiation made up of short wavelengths breaks down the polymer chains in plastics. This is called the photo-degradation process and results in the deterioration of physical properties. These include loss of impact strength, changes in color, cracking, loss of elongation and tensile strength as well as chalking of the surface. For example, photodegradation
Delrin® Homopolymer Delrin® homopolymer also known as POM is a crystalline plastic. It offers an excellent balance of properties between metals and plastics. Different chemical companies with slightly different mixes produce this material using names such as Delrin® and Celcon®. Characteristics of Delrin® are its high tensile strength, hardness, and rigidity to −40 °C. It has high fatigue and creep resistance as well as high toughness and stiffness. Delrin® has excellent dimensional stability and low friction. Because
Ultem® PEI is a semi-transparent high-temperature plastic. It is used to make custom parts as well as fasteners such as screws, hex nuts, washers, threaded studs, and spacers. It can be both molded and machined. Ultem® PEI fasteners and custom hardware are also available in glass filled grades for greater strength and stiffness. (Glass-filled grades are opaque.) Ultem® 1000 is the natural grade, and Ultem® 2300 is the glass filled grade. Ultem®
PTFE Teflon® Fasteners PTFE fasteners include Teflon® screws, hex nuts, hex head cap screws, flat washers, etc. It is also used to fabricate custom parts. Is is sold under the brand name Teflon®. However, this material can only be turned, or made into parts on a CNC machine. It can also be compression molded. But it cannot be injection molded. It is not thermoplastic. PTFE fasteners and custom parts are
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