A new polyurethane has been developed that is more resistant to water and withstands major temperature fluctuations. Polyurethane, primarily known as foam for door frames and mattresses and frequently used in paints and adhesives, is important for seals that perform tasks under especially severe conditions. Along with excellent resistance to ozone, it has four times the robustness of elastomers and effectively withstands exposure to mineral fluids.
A specific modification of the polyurethane’s components responsible for temperature characteristics lets it handle temperatures of –40 to 120°C. Seals made from the material stay flexible at low temperatures and sufficiently stable at high temperatures. The material offers excellent performance in heat and cold, can be used in mineral hydraulic fluids at up to 120°C, and is safe from damage due to hydrolysis even when used in water heated to 80°C.
Freudenberg-NOK Sealing Technologies, 47690 East Anchor Court, Plymouth, MI 48170, (800) 533-5656, www.fst.com
MS-1001 moldable silicone, for LED lighting applications, delivers a Shore D 25 hardness after cure for LED lighting designs that demand high-hardness optical parts, finer details, and excellent reproduction of mold features.
The silicone can be injection molded into complicated geometric shapes, thicker or bigger parts with reasonable molding cycle times.
The material’s high-heat and photothermal stability allows optics to withstand close proximity and alignment with high-brightness LED dies, which is not possible with optics manufactured from plastics.
Dow Corning Corp., Corporate Center, Box 994, Midland, MI 48686, (800) 248-2481, www.dowcorning.com
A high-performance polysulfone foam, Udel P-1703 NT, provides low-halogen content and low-smoke performance for wire and cable applications. The material passes NFPA 262 smoke and flame test for plenum applications.
The resin offers lower specific gravity (1.24) and higher foam rate (50 to 60%) over comparable resins such as fluorinated ethylene propylene. Its high-foam rate has a low dielectric constant (1.8 to 2) to meet cable electrical requirements without the need for significant modifications to existing constructions.
The material is chemically foamed using a FCB-8 foaming masterbatch, or it can be foamed with physical foaming gases such as nitrogen. A ratio of 97% wt of P-1703 NT resin to 3% wt FCB-8 masterbatch is typically used to achieve 50% foaming.
Solvay Specialty Polymers USA LLC, 4500 McGinnis Ferry Rd., Alpharetta, GA 30005, (770) 346-0583, www.solvay.com
HLS heat and light-stabilized polyether block amide (PEBA) copolymers resist oxidation and degradation during storage. Manufactured from medical-grade Pebax polymers and USP VI additives, the copolymer is for use in medical devices such as vascular catheters.
PEBA copolymers degrade due to oxygen, moisture, heat, and ultraviolet light, causing a loss in material properties and reduced functionality. A targeted stabilizer system decomposes and neutralizes the free radicals these conditions create, extending the reliable functionality of these devices.
Foster Corp., 45 Ridge Rd., Putnam, CT 06260, (860) 928-4102, www.fostercomp.com
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