Desi-Pak® GDT II Drop-ins are prepackaged sachet-style packets of dimensionally stable, chemically inert, aluminum silicate clay. The internal structure of this clay is a network of microscopic pores that attract and hold water through physical adsorption. Desi-Pak® remains dry and will not soften or liquefy even at full water saturation. It is non-corrosive and can be placed in direct contact with metal parts. The Activated Clay used in our Desi-Pak Drop-in Packets® actually adsorbs MORE water vapor than Silica Gel at low Relative Humidity. Desi-Pak® Activated Clay is non-synthetic, naturally-occuring material. It is the same Activated Clay desiccant used in our MIL-D-3463 compliant desiccant bags.