Wholesale Highly Absorbent Moisture-Proof Desiccant from China Suppliers, Fast Drying Dehumidifier Factory, Safe and Long-Lasting Supplier, Factories

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Product Introduction
Montmorillonite desiccant, also known as bentonite desiccant or clay desiccant, is a high-quality moisture-proof solution made from natural montmorillonite. With the chemical formula Al2O3 · 4SiO2 · nH2O, this product is non-toxic, non-corrosive, and biodegradable, making it an environmentally friendly choice for moisture control. Sourced from trusted China suppliers and manufactured in our state-of-the-art factory, this traditional desiccant effectively prevents moisture damage.
The moisture absorption of montmorillonite desiccant relies on the principle of physical adsorption.
â‘  Core material: Montmorillonite is a layered silicate mineral characterized by its myriad pores and exchangeable cations nestled within its crystal structure layers.
â‘¡ Moisture absorption process: After activation through drying, the moisture within the montmorillonite's pores is expelled, resulting in the formation of numerous microporous structures with high surface energy. When the ambient humidity exceeds its own, these micropores engage in capillary action, strongly attracting and securely locking water molecules from the air.
③ Stability: Upon moisture absorption, the volume of montmorillonite expands slightly—hence its name swelling—while maintaining its overall shape.
④ Reversible process: As environmental humidity decreases, the adsorbed water can be gradually released. Notably, montmorillonite desiccant can be regenerated and reused by heating it to temperatures between 250 °C and 350 °C.

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Product Description

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 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
šŸ›”ļø 1. Safety & Environmental Protection

The 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.

āœ” Non-corrosive — will not corrode metal or other packaging materials.
āœ” Non-toxic — suitable for food and medicine (must comply with relevant standards).
āœ” Compliant with EU environmental regulations such as REACH and RoHS.

šŸ’§ 2. High Hygroscopicity

Under low humidity conditions (<50% RH), its moisture absorption performance is significantly better than silica gel desiccant. The moisture absorption curve is gentle and the rate is stable. Saturation moisture absorption rate exceeds 50% of its own weight — 1.5Ɨ that of traditional desiccants.

ā™»ļø 3. Reversible Regeneration

After moisture saturation, most of the moisture absorption capacity can be restored through drying, making it highly cost-effective.

šŸŒ”ļø 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.

šŸ”¹ 5. Shape Stability

During the moisture absorption process, the shape remains unchanged — it will not liquefy, leak, or collapse.

šŸ’° 6. Low Price

Widely sourced raw materials — it is one of the lowest cost desiccants available on the market.

Application Fields
Field Use
šŸ± Food Industry Packaging for snacks, dry goods, tea, seafood, etc.
šŸ‘Ÿ Clothing, Footwear & Headwear Prevent clothing, leather, and shoes from getting damp and moldy during storage and transportation.
šŸ  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.
āš™ļø 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 Moderate (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 precision instruments High humidity environment, sealed space
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Precautions
  • 🚫
    Not Edible: Although non-toxic, it must not be consumed. Please keep away from children to prevent accidental ingestion.
  • āš ļø
    Avoid Damage: Damaged inner packaging (non-woven fabric or composite paper) can cause dust leakage.
  • šŸ”„
    Timely Replacement: Observe the color change of the indicator, or when desiccant particles become darker, feel damp, or show a significant increase in weight — this indicates they have absorbed enough moisture and should be replaced or regenerated.
  • šŸ“¦
    Sealed Environment: Desiccants can only effectively exert local dehumidification effects in relatively sealed spaces.
  • šŸŖ
    Storage: Unused desiccants should be stored in a cool, dry place and kept sealed.
ā“ Frequently Asked Questions (FAQ)
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What is bentonite desiccant made of, and is it safe for food packaging?
Bentonite desiccant is made from natural mineral clay (montmorillonite). It is non-toxic, odorless, and non-corrosive, making it safe for use in food packaging when it complies with relevant food-grade standards such as FDA or EU regulations. It does not contaminate the packaged contents.
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How does bentonite desiccant compare to silica gel desiccant?
Bentonite desiccant outperforms silica gel under low humidity conditions (below 50% RH) and is significantly cheaper due to its widely available natural raw materials. Both use physical adsorption and are reversible. Silica gel is preferred for precision instruments and high-humidity environments, while bentonite is the go-to choice for general packaging and cost-sensitive applications.
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Can bentonite desiccant be reused or regenerated?
Yes. After reaching moisture saturation, bentonite desiccant can be regenerated by drying it at an appropriate temperature (typically 120–150 °C for several hours). This restores most of its moisture absorption capacity, making it a cost-effective and environmentally friendly option for repeated use.
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How do I know when bentonite desiccant needs to be replaced?
You can tell the desiccant is saturated when the granules visibly darken in color, feel damp or heavier to the touch, or when the indicator (if included) changes color. At this point, the desiccant should either be replaced with a fresh pack or regenerated through drying before reuse.
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What size of bentonite desiccant should I choose for my packaging?
The size depends on the volume of the packaging and the moisture sensitivity of the contents. For small items like medicine bottles or electronic accessories, 1g–10g packs are ideal. For shoe boxes and handbags, 20g–100g is recommended. Larger storage containers, wardrobes, or safes may require 200g–1000g packs. Industrial applications typically use 5kg or more in bulk form.
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How should unused bentonite desiccant be stored?
Unused bentonite desiccant should be stored in a cool, dry environment away from direct sunlight and moisture. Always keep the original packaging sealed or transfer to an airtight container. Improper storage can cause the desiccant to pre-absorb ambient moisture, significantly reducing its effectiveness when actually needed.

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