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Highly Absorbent Montmorillonite Desiccant for Moisture-Proofing - China Suppliers & Factory Solution
Common Forms and Functions
1. Physical Form
| Granular | 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 | 5 kg / 10 kg 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
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1. Safety and Environmental ProtectionThe raw material is natural mineral, non-toxic, odorless, and non-corrosive. After disposal, it can be treated as general waste and is harmless to the environment.✔ Non-corrosive — will not corrode metal or other packaging materials.✔ Non-toxic — suitable for fields with high safety requirements such as food and medicine (must comply with relevant standards).✔ Compliant with EU environmental regulations such as REACH and RoHS.
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2. High HygroscopicityUnder low humidity conditions (<50% RH), its moisture absorption performance is significantly better than that of silica gel desiccant. The moisture absorption curve is gentle and the moisture absorption rate is stable. Good moisture absorption performance, with a saturation moisture absorption rate of over 50% of its own weight — 1.5 times that of traditional desiccants.
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3. Reversible RegenerationAfter moisture saturation, most of the moisture absorption capacity can be restored through drying, which is cost-effective.
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4. Good Temperature AdaptabilityThe performance is stable at room temperature, but the moisture absorption capacity decreases at high temperatures (>50 ℃) — this is a common characteristic of physical adsorbents.
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5. Shape StabilityDuring the moisture absorption process, the shape remains unchanged and will not liquefy, leak, or collapse.
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6. Low PriceWidely sourced raw materials — it is one of the lowest cost desiccants available.
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 it is a 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 and humidity, short-term moisture resistance | Widely used, especially for precision instruments | High humidity environment, sealed space |
Precautions
- 1. Not Edible: Although non-toxic, it must not be consumed. Please keep away from children to prevent accidental ingestion.
- 2. Avoid Damage: Damaged inner packaging (non-woven fabric or composite paper) can cause dust leakage.
- 3. Timely Replacement: Observe the color change of the indicator. When the desiccant particles become darker in color, feel damp, or show a significant increase in weight, it indicates that they have absorbed enough moisture and should be replaced or regenerated.
- 4. Sealed Environment: Desiccants can only effectively exert local dehumidification effects in relatively sealed spaces.
- 5. Storage: Unused desiccants should be stored in a cool, dry place and kept sealed.
❓ Frequently Asked Questions (FAQ)
Q
What is bentonite desiccant and how does it work?
A
Bentonite desiccant is a moisture-absorbing product made from natural bentonite mineral. It works through physical adsorption — the porous structure of bentonite traps moisture molecules from the surrounding air, keeping the enclosed environment dry. This process is reversible, meaning the desiccant can be regenerated by drying.
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Is bentonite desiccant safe for use with food and medicine packaging?
A
Yes. Bentonite desiccant is non-toxic, odorless, and non-corrosive, making it suitable for food and pharmaceutical packaging when it complies with relevant safety standards. It is also compliant with EU environmental regulations such as REACH and RoHS. However, it must never be consumed directly.
Q
What size of bentonite desiccant should I choose for my packaging?
A
The right size depends on the volume of your packaging container and its moisture sensitivity. For small items like medicine bottles or electronic accessories, 1g–10g packets are ideal. For shoe boxes and handbags, 20g–100g is most common. Larger spaces such as safes, wardrobes, or containers may require 200g–1000g or industrial bulk quantities.
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Can bentonite desiccant be reused or regenerated?
A
Yes. Bentonite desiccant is reversible — after it reaches moisture saturation, most of its moisture absorption capacity can be restored by heating and drying it. This makes it a cost-effective and eco-friendly option compared to single-use desiccants.
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How do I know when a bentonite desiccant needs to be replaced?
A
You can tell a bentonite desiccant is saturated when the granules become noticeably darker in color, feel damp to the touch, or show a significant increase in weight. At this point, the desiccant should be replaced with a fresh packet or regenerated through drying before reuse.
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What is the difference between bentonite desiccant and silica gel desiccant?
A
Both work through physical adsorption and are non-toxic. The key differences are: bentonite is a natural mineral and lower in cost, while silica gel is a synthetic product and typically more expensive. Bentonite performs better at low humidity levels (<50% RH), whereas silica gel is more widely used for precision instruments. Bentonite is also more environmentally friendly as it can be disposed of as general waste.