Silica Gel

Silica Gel is often used to control the relative humidity level in the surrounding environment. The moisture absorber is a harmless conventional desiccant commonly used to adsorb moisture and water vapour in applications such as medication bottles, food packaging, and leather products. Effectively absorbing moisture and humidity reduces the likelihood of mould growth and prevents food spoilage. The packets of Silica Gel often used in the packaging with electronics can help reduce condensation and prevent damage.  

Made from silicon dioxide (SiO2), Silica Gel is the same material found in the makeup of quartz. It is composed of one silicon atom combined with two oxygen atoms. Silica Gel was created by processing sodium silicate with an acid patented in 1919 by a John Hopkins University chemistry professor named Walter Patrick. When the substance undergoes drying, it forms a xerogel that successfully acts as a desiccant.  

Silica Gel is like porous sand, and it has tiny pores that can rapidly absorb and hold moisture where water molecules quickly stick to the surface of each gel granule. The non-reactive and odourless desiccant can absorb 40% of its weight and rapidly reduce the relative humidity (RH) by up to 40% in an enclosed space such as a sealed container. The interconnected pores on the gel granule use the process of capillary condensation to remain dry even when fully saturated with moisture. After saturation, Silica Gel can be reused by heating the desiccants up to 300ºF (150ºC) to remove the moisture content.  

Silica Gel is available in 3 standard types: white, orange, and blue.  

White Indicating Silica Gel 

White Silica Gel (it often appears clear) is a non-indicating Silica Gel that is completely odourless, tasteless, non-corrosive, non-toxic, and non-reactive to chemicals. White Silica Gel makes a food-safe, moisture preventative and is common in food packaging. They are commonly used with a humidity indicator card to monitor the replacement requirements of the desiccant.  

Blue Indicating Silica Gel 

Blue Silica Gel contains cobalt chloride, which appears blue until exposed to moisture. Upon saturation, it turns pink to alert when desiccant occurs visually. Stream Peak’s Humi Dri Blue Silica Gel is typically packaged in Tyvek desiccant bags for immediate use in sensitive electronic equipment.  

Orange Indicating Silica Gel 

Often called Environmental Gel (Envirogel), Orange Silica Gel contains a safe organic indicator known as methyl-violet, which transitions from orange to green after saturation with water vapour. Orange Indicating Silica Gel makes an acceptable alternative to Blue Indicating Silica Gel. It is heavy-metal-free, non-corrosive, non-toxic, and environmentally friendly, making it ideal for many applications.  

To learn more about Silica Gel, please visit our blog and watch our video on Silica Gel. Direct purchase is also available from our online store. Contact us for bulk quantities, custom sizes, or special printing requirements. 

White Non-Indicating Silica Gel
  • Tasteless
  • Odourless
  • Food-safe
  • FDA compliant
  • Non-toxic
  • Non-corrosive 
  • Non-reactive (does not change colour when exposed to moisture) but appears hazy or milky when saturated 
  • Silica gel can adsorb up to 40% of its weight in water
Blue-Indicating Silica Gel ​
  • Odourless 
  • Non-corrosive
  • Changes from blue to pink when saturated
  • Non-dusting packing in Tyvek desiccant bags available 
  • Works well for non-dusting packing for electronic equipment
  • Silica gel can adsorb up to 40% of its weight in water
 Orange-Indicating Silica Gel
  • Odourless
  • Heavy metal-free
  • Non-corrosive 
  • Environmentally friendly 
  • Changes from orange to green when saturated
  • Silica gel can adsorb up to 40% of its weight in water
  • White Indicating Silica Gel
  • Blue Indicating Silica Gel
  • Orange Indicating Silica Gel

Silica Gel Product Brochure: Download