Desiccants
CARGENTRA Silica Gel Desiccant Sachets
A packaging moisture-control solution designed to reduce the risk of mold, condensation, corrosion and product deterioration during packing, storage and transportation.
- Highly porous silica structure
- Physical moisture adsorption
- Multiple sachet sizes
- Designed for sealed packaging
What Is Silica Gel?
Silica gel is a porous desiccant material made primarily of silicon dioxide (SiO₂). Inside each silica gel bead is a network of micropores that creates a large internal surface area.
When placed inside sealed packaging, moisture molecules in the air are held on the surface and within the porous structure of the silica gel beads through physical adsorption.
Unlike calcium chloride desiccants, silica gel does not absorb water in a way that forms a liquid solution or gel. The beads remain in a relatively stable form throughout use.
Why Does Packaging Need Moisture Control?
Even after a product is packaged, a certain amount of air and moisture can remain inside the packaging. Humidity can also come from the packaging material, the product itself, or temperature changes during storage and transport. For moisture-sensitive products, excess humidity can contribute to:
- Mold and musty odors
- Oxidation or corrosion of metal components
- Condensation inside bags or boxes
- Caking in powder-form products
- Loss of crispness in dry foods
- Damage to leather, textile, and wood surfaces
- Reduced performance of electronic components
- Damage to packaging, labels, or cartons
Silica gel sachets help reduce moisture levels inside sealed spaces and maintain a more stable storage environment.
Moisture Adsorption Mechanism
Silica gel has a large internal surface area thanks to its microporous network. When humid air contacts the silica gel beads, water vapor molecules are held on the surface of the material. This process helps lower relative humidity inside sealed packaging. The actual effectiveness depends on:
- Volume of the space being protected
- How sealed the packaging is
- Initial moisture in the product and packaging materials
- Ambient temperature and humidity
- Storage or transit duration
- The amount of silica gel used
- The water-vapor permeability of the packaging
No silica gel sachet performs identically under every condition — actual effectiveness varies by shipment and environment.
Key Benefits
Humidity control inside sealed packaging
Helps reduce excess moisture inside bags, boxes, bottles, cartons, or sealed packaging.
Stable bead form
Silica gel adsorbs moisture without turning into a liquid solution under normal usage conditions.
Multiple specifications
Weight and sachet size can be selected based on packaging volume and product moisture sensitivity.
Easy to place
Compact sachet size, convenient to place inside boxes, bottles, bags, cartons, cargo units, or component packaging.
Cross-industry applications
Suited to electronics, components, pharmaceuticals, dry foods, footwear, bags, leather goods, apparel, and industrial equipment.
Customizable
Sachet material, weight, and packaging format can be advised on based on actual requirements.
Product Specifications
Specifications are provided based on packaging requirements and actual product availability.
Please contact CARGENTRA to receive the current list of weights, packaging formats, and availability for your specific application.
Sachet Material
A silica gel sachet's effectiveness depends not only on the beads inside but also on the sachet material. Sachet material is selected based on sachet size, water-vapor transmission rate, durability requirements, and the customer's application.
Adsorption Capacity
Adsorption capacity depends on temperature, relative humidity, exposure time, silica gel type, and packaging conditions. Please contact CARGENTRA to receive the technical specification for each product code.
Applicable Industries
Electronics & Components
Helps control humidity in packaging for components, circuit boards, devices, and moisture-sensitive parts.
Pharmaceuticals & Supplements
Can be used for medicine, vitamin, and supplement packaging when the product specification and safety documentation match the application.
Dry Foods
Suited to certain dry foods or food packaging when the correct product and technical documentation are used.
Footwear, Bags & Leather Goods
Helps limit humid conditions that cause odor and mold inside sealed packaging.
Apparel & Consumer Goods
Helps control humidity inside packaging bags, boxes, or cartons.
Automotive & Metal Parts
Helps reduce the risk of condensation and corrosion inside sealed packaging.
Optical Devices & Precision Instruments
Helps maintain a drier environment for moisture-sensitive products.
Wood & Furniture
Can be used in packaging for accessories, components, and appropriately sized sealed cargo units.
How Do Silica Gel and Container Desiccants Differ?
Usage environment
Silica Gel: Mainly used inside sealed packaging
CaCl₂: Used inside containers or areas with a high moisture load
Mechanism
Silica Gel: Physical adsorption
CaCl₂: Absorbs and holds a larger volume of moisture
Scale of control
Silica Gel: Suited to boxes, bags, bottles, cases, or product packaging
CaCl₂: Suited to containers and long transport journeys
State after absorption
Silica Gel: Beads remain in a relatively stable form
CaCl₂: Material may gradually convert from powder to gel
Primary use
Silica Gel: Protecting moisture-sensitive products and components
CaCl₂: Helping reduce the risk of container rain
Product selection depends on the volume of the space, moisture load, how sealed the packaging is, and how moisture-sensitive the goods are.
How to Choose the Right Sachet Weight
The sachet weight should not be chosen based solely on the product's weight inside the packaging. Sizing should take into account:
- Packaging size and volume
- How sealed the bag, box, or bottle is
- Water-vapor permeability of the packaging material
- Initial moisture level of the product
- Required protection duration
- Temperature and humidity conditions
- How often the packaging is opened
- How moisture-sensitive the goods are
How to Use
- 1Determine the correct specification based on packaging volume and the product being protected.
- 2Only open the outer bag containing the silica gel sachets right before use.
- 3Place the silica gel sachet inside the packaging, avoiding sharp edges that could puncture it.
- 4Seal the packaging as soon as possible after placing the desiccant sachet.
- 5Store any unused silica gel in sealed packaging.
- 6Do not use sachets that are torn, punctured, contaminated, or of unclear condition.
Safety Notes
- Do not eat
- Keep out of reach of children
- Do not cut or tear the sachet
- Do not let beads fall directly onto the product
- Do not use a damaged sachet
- Follow the supplier's handling instructions
- This desiccant product is not food
Certifications & Documentation
Technical documentation and compliance records are provided according to each product code and customer request.
Frequently Asked Questions
Specification Table
Product
CARGENTRA Silica Gel Desiccant Sachets
Material
Silica gel, silicon dioxide SiO₂
Mechanism
Physical moisture adsorption
Format
Individual sachets or roll format, depending on specification
Bead color
According to confirmed product code
Weight
According to available specification
Application
Humidity control inside sealed packaging
Sachet material
According to product code
Adsorption capacity
According to the applicable TDS
Documentation
Available according to product code and customer requirements
Get the Right Silica Gel Sachet Size
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