Home Products Beryllium Products Beryllium Metal I-70-H I-70-H GRADE BERYLLIUM I-70-H grade beryllium is hot isostatically pressed beryllium consisting of 99% beryllium with a maximum of 0.7% beryllium oxide. Low oxide grades are preferred for bare beryllium mirrors because they yield a lower level scatter and polish easier than higher oxide grades. I-70-H is stable over a temperature range of 77K to 500K and offers superior reflectivity in the far infrared region (98.5% at 8-12 micron wavelengths without optical coatings). TENSILE PROPERTIES Ultimate Tensile Strength, psi, minimum 50.0 (345 Mpa) Yield Strength (0.2% offset), psi, minimum 30.0 (207 Mpa) Elongation (% in 4 diameters), minimum 2.0 Micro-yield Strength, ksi 3.0 AVAILABLE DESIGN CONFIGURATIONS Available in rod or bar. Special sizes and shapes can be made.