The Desiccant Cannot Become a Contaminant
Pharmaceutical products are stability-tested against defined humidity limits, and moisture ingress during storage and transcontinental distribution is a leading cause of out-of-specification results: hydrolysis of moisture-sensitive APIs, capping and softening of tablets, loss of effervescence, microbial risk and packaging failures such as label lift and blister fogging. Controlling that moisture with a desiccant is standard practice, but in a regulated supply chain the desiccant itself is scrutinised, because anything sharing a package with a medicine must not introduce a chemical hazard.
That rules out several common desiccant additives. Dimethylfumarate (DMF), once used as an anti-mould agent, is banned in the EU under Directive 2009/251/EC and is a potent sensitiser; nitrite anti-caking compounds are reactive; and cobalt-chloride humidity indicators are classified hazardous. BENZPACK C DRY activated clay is certified DMF-free, nitrite-free and cobalt-chloride-free, stays solid when saturated with no dust or liquid migration, and is REACH-registered, making it suitable for pharmaceutical and healthcare packaging where the desiccant must be inert. Combined with GDP-aligned moisture control across the cold and ambient chain, it keeps product within specification from manufacture to patient.