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Highly Absorbent Montmorillonite Desiccant from China Suppliers and Factory, Fast Drying, Safe, and Long-Lasting
Common Forms and Functions
1. Physical Form
| Graininess | The most common form — irregular or nearly spherical small particles. Larger specific surface area and faster moisture absorption rate. |
| Spherical | Regular balls made by granulation process. Good fluidity, beautiful appearance, more uniform filling during packaging, and less dust. |
| Strip / Block Shaped | Rarely seen; usually used for specific devices or spaces. |
2. Particle Size / Mesh Number
| 1–2 mm | The most commonly used size, suitable for the vast majority of small packaging (such as electronic products, food bags). |
| 2–4 mm | |
| 4–8 mm | Used for slightly larger spaces such as luggage, shoe boxes, and small to medium-sized packaging boxes. |
| Coarse-grained (>8 mm) | Less commonly used for direct packaging; powder form may be used for filling special composite materials. |
| Fine Powder |
3. Unit Packaging Weight
This is the most direct specification parameter selected by the user, determined based on the size of the packaging container and moisture resistance requirements. Weight does not represent its performance limit, but rather a convenient packaging for standard application scenarios.
| Specifications | Use | |
| Micro / Small Sized | 1g 2g 3g 5g 10g | Extremely small spaces such as small medicine bottles, small electronic product bags, cosmetic samples, camera lens covers, etc. |
| Standard Specification | 20g 30g 50g 100g | The most widely used interval. Suitable for shoe boxes, handbags, toolboxes, instrument boxes, medium-sized food packaging, suitcases, etc. |
| Medium Size Specification | 200g 500g 1000g | Large packaging boxes, container drying rods/bags, warehouse shelves, wardrobes, small enclosed spaces (such as safes, Gun Safe). |
| Large / Industrial Specifications | 5kg / 10kg and above (usually bagged or barreled loose materials) | Used for internal filling of large equipment, large-scale container loading, moisture-proof storage of industrial raw materials, or as a raw material for recycled desiccants. |
Core Functions of the Product
🛡️ 1. Safety & Environmental Protection
Raw material is natural mineral — non-toxic, odorless, and non-corrosive. Treatable as general waste; harmless to the environment.
✔ Non-corrosive — will not corrode metal or packaging materials.
✔ Non-toxic — suitable for food and medicine (must comply with relevant standards).
✔ Compliant with EU REACH and RoHS regulations.
💧 2. High Hygroscopicity
Under low humidity conditions (<50% RH), moisture absorption performance is significantly better than silica gel desiccant. The moisture absorption curve is gentle and stable. Saturation moisture absorption rate exceeds 50% of its own weight — 1.5× that of traditional desiccants.
🔄 3. Reversible Regeneration
After moisture saturation, most moisture absorption capacity can be restored through drying — cost-effective and reusable.
🌡️ 4. Good Temperature Adaptability
Performance is stable at room temperature. Moisture absorption capacity decreases at high temperatures (>50°C) — a common characteristic of physical adsorbents.
🧱 5. Shape Stability
During the moisture absorption process, shape remains unchanged — will not liquefy, leak, or collapse.
💰 6. Low Price
Widely sourced raw materials — one of the lowest cost desiccants available on the market.
Application Fields
| Field | Use |
| 🍜 Food Industry | Packaging for snacks, dry goods, tea, seafood, etc. |
| 👟 Clothing, Footwear & Headwear | Prevent clothing, leather, and shoes from getting damp and moldy during storage and transportation. |
| 🏠 Household Items | Gift boxes, toolboxes, storage cabinets, wardrobes, etc. |
| 🔌 Electronic & Electrical Appliances | Moisture-proof packaging for lightweight electronic products. |
| 🚢 Storage & Transportation | Container and container moisture prevention to prevent "container rain" of goods. |
| ⚙️ General Industrial Products | Rust-proof packaging for hardware, mechanical parts, and instruments. |
Comparison of Other Common Desiccants
| Characteristic | Bentonite Desiccant | Silica Gel Desiccant | Calcium Chloride Desiccant |
| Main Ingredient | Natural bentonite | Synthetic silica gel | Calcium chloride |
| Moisture Absorption Principle | Physical adsorption (reversible) | Physical adsorption (reversible) | Chemical adsorption (deliquescence, conversion) |
| Low Humidity Effect | ⭐ Optimal (<50% RH) | Good | General |
| Environmental Friendliness | ⭐ Excellent, naturally treatable | Good, but synthetic product | Generally — solutions have weak corrosiveness |
| Safety | ⭐ High (non-toxic), safe and inert | High (non-toxic), safe and inert | Medium (with irritability) |
| Cost | ⭐ Minimum | Medium | Low (but with low unit moisture absorption cost) |
| Typical Color Variation | Color deepens; particles become damp | Orange/Blue → Colorless/Pink | Particles → Solution |
| Best Operating Environment | Normal temperature & humidity, short-term moisture resistance | Widely used, especially precision instruments | High humidity environment, sealed space |
Precautions
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Not Edible: Although non-toxic, it must not be consumed. Please keep away from children to prevent accidental ingestion.
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Avoid Damage: Damaged inner packaging (non-woven fabric or composite paper) can cause dust leakage.
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Timely Replacement: Observe color changes of the indicator. When desiccant particles become darker, feel damp, or show significant weight increase, they have absorbed enough moisture and should be replaced or regenerated.
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Sealed Environment: Desiccants can only effectively exert local dehumidification effects in relatively sealed spaces.
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Storage: Unused desiccants should be stored in a cool, dry place and kept sealed.
❓ Frequently Asked Questions
Q
What is bentonite desiccant made of, and is it safe to use?
Bentonite desiccant is made from natural mineral clay (bentonite). It is non-toxic, odorless, and non-corrosive, making it safe for use in food packaging, pharmaceutical packaging, and consumer products. It complies with EU environmental regulations including REACH and RoHS.
Q
How does bentonite desiccant compare to silica gel desiccant?
Both use physical adsorption and are non-toxic. However, bentonite desiccant performs better under low humidity conditions (<50% RH), is more environmentally friendly as a natural mineral, and is significantly lower in cost. Silica gel has a broader operating humidity range and is preferred for precision instruments.
Q
Can bentonite desiccant be regenerated and reused?
Yes. After the desiccant reaches moisture saturation, it can be regenerated by heating/drying, which restores most of its moisture absorption capacity. This makes it a cost-effective choice for applications where reuse is practical.
Q
How do I know when the bentonite desiccant needs to be replaced?
The desiccant needs replacement when the particles noticeably darken in color, feel damp or heavy to the touch, or show a significant increase in weight. Some products include a color indicator that changes when saturation is reached.
Q
What size or weight of bentonite desiccant should I choose for my packaging?
The choice depends on the size of the packaging container and moisture sensitivity of the contents. Small packages (medicine bottles, electronics bags) typically use 1g–10g packets. Medium packaging like shoe boxes and toolboxes use 20g–100g. Large containers, safes, or industrial applications may require 200g–1000g or bulk quantities.
Q
How should unused bentonite desiccant be stored?
Unused bentonite desiccant should be stored in a cool, dry environment away from humidity and direct sunlight. Always keep the packaging sealed until ready for use to preserve its full moisture absorption capacity.