Wholesale Molecular Sieve Powder in Polyurethane Coatings Adhesives Sealants and Elastomer

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Product Inroduction: Molecular Sieve Powder Activation Moisture Adsorbents in PU

Technical Parameter:

ModelActivated Molecular Sieve Powder
ColorWhite
Nominal   pore diameter3 angstroms /4 angstroms /5 angstroms /10   angstroms
ShapePowder
Type3A4A5A13X   (10A)
Size   (μm)2~42~42~42~4
Bulk   density (g/ml)≥0.4≥0.4≥0.4≥0.4
Static   water absorption (%)(at RH75%, 25℃,24hrs)≥23≥24≥25≥27
PH Value   in 5% suspension≤11.5≤11.5≤11.5≤12.0
Water   content (%)≤2.0≤2.0≤2.0≤2.0
Screen   residue (325 mesh)≤0.5≤0.5≤0.5≤0.5
Size2-4μm equal to 300-325mesh
Packages15KG/ bag, 9tons/20GP,18tons/40GP

1. What is molecular sieve powder?

Molecular sieve powder is a thermally activated synthetic zeolite (also known as activated zeolite powder) with high moisture adsorption capacity. It functions as a desiccant and moisture scavenger, especially in polyurethane, epoxy, adhesive, and coating applications.

2. What is the main function of molecular sieve powder in polyurethane systems?

Its main role is to remove trace moisture in 1K or 2K polyurethane systems. Moisture reacts with isocyanates to form CO₂ gas, causing bubbles, heat, and reduced product stability. Molecular sieve powder prevents this by adsorbing the moisture, ensuring a smooth, defect-free finish and extended shelf life.

3. Why is 3A molecular sieve powder used in sensitive systems?

3A zeolite powder is the potassium form of Type A zeolite with a pore size below 3 angstroms. It selectively adsorbs water while excluding larger molecules, making it ideal for moisture-sensitive formulations like polyurethane adhesives and epoxy flooring.

4. What industries use molecular sieve powder?

It is widely used in:

– Polyurethane adhesives and coatings

– Epoxy paints, resins, and flooring

– Silicone and polysulfide sealants

– Waterproofing and sports flooring

– Storage of zinc-rich and metallic pigments

– Catalyst support and azeotropic reactions

5. What are the benefits of using molecular sieve powder in formulations?

Moisture removal to prevent foaming

Improved bonding and surface finish

Extended pot life and shelf stability

Reduced reaction heat during curing

Catalytic effect for faster crosslinking

Uniformity and reduced defects

6. How does molecular sieve powder improve adhesive performance?

It minimizes side reactions by absorbing moisture, which enhances adhesive strength, increases cross-linking density, and improves chemical resistance.

7. Can molecular sieve powder act as a defoaming agent?

Yes, by eliminating water that reacts with isocyanate, it prevents CO₂ generation and foaming in systems like polyurethane adhesives, elastomers, inks, and coatings.

8. Is the powder compatible with solvent-free systems?

Yes, it can be directly added to solvent-free 1K or 2K systems and is also available in paste form (e.g., 50% dispersion in castor oil) for easy handling.

9. What is the difference between powder and paste forms?

Powder form: High-purity dehydrated zeolite, ideal for dry formulations

Paste form: Dispersed in carrier oil, easier to incorporate in liquid systems

10. Is molecular sieve powder environmentally friendly?

Yes. It is non-toxic, odorless, and safe to use. It can also be regenerated for reuse, reducing overall waste and costs.

11. What are the key technical features of the powder?

– High water absorption
– Uniform pore size
– Strong adsorption capacity
– Fast dispersibility
– Catalytic reactivity in PU systems

12. How should molecular sieve powder be stored?

Store in sealed, moisture-proof packaging in a dry place. Exposure to air should be minimized to maintain its adsorption efficiency.

13. Can it be used for pigment or metallic paint storage?

Yes. Molecular sieve powder helps stabilize sensitive pigments such as zinc-rich paints by removing ambient moisture and preventing unwanted reactions during storage.

14. What makes it better than other powder desiccants?

It offers:
– Higher adsorption efficiency
– Environmental safety
– Selective adsorption for moisture only
– Longer-lasting stability in formulations

Factory Introduction

Molecular Sieve Manufacturer

We Ensure Quality Control

– Strict SOPs implemented by experienced technicians
– Regular sampling and lab testing throughout production
– Retained sample storage for 5 years for traceability
– Final inspection before shipment to ensure compliance with technical standards

SienChem Technology Co., Ltd, founded in 2019, specializes in the production and marketing of molecular sieve, activated molecular sieve powder, and activated alumina for industrial use. Our products serve applications such as gas purification, water treatment, and air separation. Located in Anhui, our factory produces 8,000 tons annually and operates under the ISO 9001 quality management system. We maintain a modern lab and quality control center staffed by 8 engineers and 12 technicians. 

Molecular Sieve Manufacturer

Frequently Asked Questions

Frequently Asked Question

Our factory specializes in the manufacturing of molecular sieve products, including:
Molecular Sieve Powder (Activated)
Molecular Sieve Beads and Pellets (3A, 4A, 5A, 13X)
Activated Alumina
These are widely used in gas drying, solvent recovery, air separation, polyurethane systems, coatings, and more.

Our factory has an annual capacity of 8,000 tons of molecular sieve, with advanced dehydration and activation equipment, ensuring consistent quality and large-scale supply for both domestic and international clients.

Yes, we provide OEM, ODM, and private labeling services based on customer needs, including customized packaging, branding, and technical formulation support.

Yes, for every batch we supply a Certificate of Analysis (COA) and Technical Data Sheet (TDS), including information on moisture adsorption, particle size,bulk density, and etc.

– Strict SOPs implemented by experienced technicians
– Regular sampling and lab testing throughout production
– Retained sample storage for 5 years for traceability
– Final inspection before shipment to ensure compliance with technical standards
– Third party inspection such as SGS or ClQ is acceptable.

Yes, free samples (500g–1kg) are available for quality testing and formulation trials. Shipping costs may be covered by the customer and refund to next order.

Yes, we are manufacturer. You are very welcome to visit our factory! We encourage customer visits to see our production process, quality control system, and laboratory facilities firsthand. Please contact us in advance to arrange the schedule—we’ll be happy to provide airport pickup, hotel booking assistance, and a full factory tour. We look forward to meeting you in person and building a long-term partnership. 

Our standard payment terms are flexible to meet customer needs. Common options include:
– T/T (Telegraphic Transfer): 30% deposit in advance, 70% balance before shipment
– L/C (Letter of Credit): Available for large or long-term orders
– Negotiable terms: For trusted or repeat customers, we can discuss more favorable terms
– Other options: PayPal, or RMB payments for sample orders or small quantities

Our standard MOQ is 1000 kg for most molecular sieve products. However, for trial orders, samples, or new customers, we can be flexible and accept smaller quantities, such as 450 kg (one pallet). We’re happy to support your testing or initial market development before larger purchases.

Normally regular products are in stock.

– Standard orders: 7–10working days
– Custom orders: 12–15 working days
Delivery time depends on order quantity and packaging requirements.

We offer:
– 15kg/ carton box
-150kg /steel drum
-1000kg/jumbo bag
– Custom packaging available upon request
All packaging is moisture-proof and sealed to maintain product performance.

Yes, our technical team can provide formulation advice, compatibility testing, and usage guidelines to help integrate our molecular sieve powder into your system effectively.

Yes, we offer competitive pricing and volume-based discounts. The final price depends on factors such as order quantity, packaging requirements, and payment terms. For regular or bulk customers, we’re happy to provide special pricing or long-term cooperation discounts.

We take after-sales service seriously and are committed to long-term customer satisfaction. For all molecular sieve products, we provide:
Technical support for product application, usage guidance, and troubleshooting
Follow-up service to ensure product performance meets your expectations
Free replacement or compensation for any confirmed quality issues
Responsive communication, with inquiries replied to within 24 hours
Document support including COA, MSDS, TDS, and RoHS/REACH certifications as needed

Yes. Our molecular sieve powders are non-toxic, odorless, and recyclable after regeneration. They are safe for use in industrial and consumer applications.

You can contact our sales team via email or phone with your specific requirements (grade, quantity, packaging). We will respond with a detailed quotation within 24 hours.

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