ZYTEL

Zytel nylon resins are thermoplastic polyamides having properties that place them high on the list of engineering plastics. Zytel nylon resins are tough and can withstand repeated impact. They are highly resistant to abrasion and to most chemicals. Molded articles retain their shape at elevated temperatures, are strong in thin sections and have low coefficients of frictions. Many of the compostions, including Zytel 101L (a type of Zytel nylon resin) are classified by Underwriters' Laboratories. Also, flame retardant nylons qualifying for the UL94 V-1 and 94 V-0 are under continuing development. Zytel nylon resins may be reinforced with glass fibers to increase their tensile strength, stiffness and dimensional stability.

Most Zytel nylon resins are crystalline materials with melting points higher than those of many other thermoplastic materials. However, some are noncrystalline and have softening temperatures, not true melting points. Zytel nylon resins must be heated to their processing temperatures before they can be molded. Certain types of Zytel resins require greater energy input htan others. The heat energy required for doing this is known as heat of fusion and is a significant part of the heat energy required to bring crystalline plastic resins to their proper processing temperature.

Zytel nylon resins can be molded easily and without problems when processed at the recommended temperatures and when kept dry. They are pakaged at low moisture content suitable for molding. When exposed to the atmosphere fo a period of time, nylon absorbs moisture and must be dried before it can be molded. This is especially important as unexpected results may arise should the nylon resins be processed when it is not dry.