WEB EXCLUSIVE: New Altuglas ShieldUp nanostructured acrylic sheet from Altuglas International (a unit of Arkema Inc.), Philadelphia, is said to combine the toughness of extruded acrylic sheet with all the other properties of cast sheets. Impact modifiers often cause a deterioration of transparency at elevated temperatures, but the new sheet reportedly maintains high clarity at all temperatures and has enhanced chemical resistance to alchohol and other cleaning agents. What makes it different is proprietary polymerization technology that structures the combination of PMMA and rubber at nanometer scale into a pattern resembling a knitted mesh. This thermoformable, scratch-resistant, and UV-resistant sheet is aimed at automotive sunroofs and side windows, as well as aeronautics, photovoltaics, and safety glazing. Altuglas ShieldUp is available globally. Here are selected properties:
•Flexural modulus, MPa: 1500-2700 for ShieldUp, vs. 3000 for cast impact acrylic and 2100-2650 for extruded impact acrylic.
•Charpy unnotched impact, kJ/m2: 40-90 for ShieldUp, vs. 30 for cast impact and 50-85 for cast extruded.
•Charpy notched impact, kJ/m2: 2.4-5 for ShieldUp, vs. 2 for cast impact and 2.2-5.7 for cast extruded.