mp 140- 142 °C(lit.)  Silica gel for column chromatography 60 A, hihg-purity  grade for column chromatography, activity acc. To  Brockmann and Schodder 2-3, particle size 0.2-0.5 mm  ,35-60 mesh ASTM, 1kg  grade high-purity grade  form crystals  mfr. No. Sigma- Aldrich $^{®}$  activity acc. To Brockmann and  Schodder 2-3  particle size μm  35-60 mesh  pore size 0.8 cm $^{3}$/g pore   volume  surface area 500 m $^{2}$/g  bp 2230 °C  mp >1600 °C  5  August 2020 EN-c4f_annexiitechspeciiitechoffer_en.docx  EN-c4f_annexiitechspeciiitechoffer_en.docx Page 45 of 76 