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Granular 4a Molecular Sieve Desiccant / Anti Corrosive Coating Molecular Sieve Pellets

10 Kilograms
Granular 4a Molecular Sieve Desiccant / Anti Corrosive Coating Molecular Sieve Pellets
Features Gallery Product Description Request A Quote
Shape: Granular;Pellet
Color: Beige
Size: 1.6-2.5mm, 3.0-5.0mm
Potassium A Type Molecular Sieve: Spheric Particle
Purity: 98%
Attrition Rate: ≤ 0.20%
High Light:

molecular sieve 4a


4 angstrom molecular sieves


moisture removal molecular sieve desiccant

Basic Infomation
Place of Origin: Shaanxi,China
Brand Name: Xi'an Lvneng
Certification: ISO9001:2008
Model Number: 4A Molecular Sieve
Payment & Shipping Terms
Packaging Details: 1. Carton Drum/25KG 2. Carton Box/25KG; 3. Iron Drum/150KG
Delivery Time: 3-15 work days
Payment Terms: L/C, T/T
Supply Ability: 50 Tons/ per Month
Product Description

4a Molecular Sieve Desiccant Moisture Removal In PU Or Paint&Coatings


Polyurethane (paint, glue, sealants)

No matter single component or two-component polyurethane products, water will react with the isocyanate to form amine and carbon dioxide; amines then further react with isocyanate, releasing a lot of carbon dioxide and bubbles formed on the paint film surface, which results in film performance deteriorate and even failure. Adding molecular sieve (powder)   to the plasticizer or dispersant can solve the problem. According to the different polyurethane systems, the quantity of 5%-8% is sufficient to remove residual water.

Anti-corrosive Coating

In the epoxy zinc-rich primer, a trace of water will react violently with zinc to produce hydrogen, increasing the pressure inside barrels and shortening the lifespan of primer, which then results in the paint films' dense, abrasion resistance and hardness greatly reduced. As a purely physical absorbent desiccant, molecular sieve (powder)  ​is safe and convenient while in use in the aspects of removal of water but meanwhile no reaction with the binder.

Metal Powder Coating

There also exist similar reactions in the metal powder coating, such as in aluminum paint.


Technical Index


Molecular Formula Na2O·Al2O3·2SiO2·9/2H2O
SiO2/ Al2O3 ≈ 2
Normal Pore Opening 4 Angstroms (Å)
Regeneration temp. (°C) 200-315
Advantages High Stability; High Strength; Large Water Absorption; Low Attrition; Deep Dehydration







Molecular Sieve 4A Typical Physical Properties
Items Unit 8*12 Mesh 4*6 Mesh
Bead Size mm 1.6-2.5 3.0-5.0
Bulk Density g/ml ≥ 0.70-0.82 0.65-0.80
Equilibrium Water Capacity @ 25 wt% 20.5-22.5 20.5-22.5
Equilibrium Methanol Capacity wt% 15.0 15.0
Heat of Adsorption BTU/lb of H2O 1800 1800
Crush Strength Point Contact N ≥ 30-80 85-160
Variation Coefficient - 0.3 0.3
Attrition Rate wt% 0.1 0.1
Size Qualification % 98 98
Package Moisture wt% 1.5 1.5
The interval value of the indexes above are on the basis of the different grade of Molecular Sieve 4A





The molecular sieve shall be stored at room temperature, in which the relative humidity does not exceed 90%, and be not exposed to air, and prevented against water, acids and alkalizes.




1. The product cannot be exposed in the open air and should be stored in dry condition with the air-proof package.

2. The product should be regenerated after a certain period of adsorption. The appropriate regenerated temperature would be better below 350°C.


Granular 4a Molecular Sieve Desiccant / Anti Corrosive Coating Molecular Sieve Pellets 0

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