Silica Gel Yellow/Blue, 2.5-6 mm, with colour indicator, fractured, 500 gSilica Gel Yellow Blue, 2. 5 6 mm, with colour indicator, fractured, Density (D) 2,2 g cm, CAS No. 7631 86 9, EC No. 231 545 4 Alternative product: environmentally friendly silica gel. Patented, organic humidity indicator heavy metal free Reversible colour change Note: We recommend activating silica gels before using it for the first time Properties: Regeneration at 120 C for approx. 4 hours Adsorptive capacity: at 90 % rel. humidity approx. 34 wt%