Introduction to Epoxy Resin
Epoxy resin is a thermosetting polymer known for its excellent adhesion, mechanical strength, and chemical resistance. It is widely used in coatings, electrical insulation, composite materials, adhesives, and construction. However, impurities such as filter aids, inorganic salts, and fine mechanical particles can compromise the quality and performance of epoxy resin. Effective filtration is therefore essential to maintain product consistency, improve downstream processing, and ensure reliable end-use applications.
Filtration Process for Epoxy Resin
Step 1: Use of Filter Aids
1. Diatomaceous earth is the most common filter aid for epoxy resin purification, providing high porosity and effective removal of suspended solids.
2. Perlite, activated carbon, and bentonite may also be used in smaller quantities depending on process requirements:
3. Perlite – lightweight, high permeability filter aid.
4. Activated carbon – removes color bodies and trace organics.
5. Bentonite – absorbs colloids and stabilizes the resin.
Step 2: Primary Filtration with Great Wall Products
After filter aids are introduced, coarse filtration is required to remove both the filter aids themselves and inorganic salts or other mechanical impurities. Great Wall SCP111 filter paper and 370g/270g filter sheets are highly effective at this stage, offering:
1. High retention capacity for filter aids.
2. Stable performance under resin filtration conditions.
3. Balanced flow rate and filtration efficiency.
Step 3: Secondary / Final Filtration
To achieve the required purity, epoxy resin undergoes fine polishing filtration. Recommended products: phenolic resin filter cartridges or filter plates, which are resistant to chemical attack and capable of removing fine particulates.
Benefits include:
1. Enhanced clarity and purity of epoxy resin.
2. Reduced risk of impurities interfering with curing or application.
3. Consistent quality for high-performance industries such as electronics and aerospace.
Great Wall Filtration Product Guide
SCP111 Filter Paper
1. Excellent retention of filter aids and fine impurities.
2. High wet strength and mechanical durability.
3. Compatible with both water-based and solvent-based epoxy systems.
4. Repeated use
370g / 270g Filter Papers (Water & Oil Filtration Grades)
1. 370g: Recommended for applications requiring stronger retention and higher resistance to pressure drop.
2. 270g: Suitable for processes needing faster flow rates with good impurity capture.
3. Applications: removal of filter aids, water, oil, and mechanical impurities in resin systems.
Benefits of Great Wall Filtration in Epoxy Resin Production
• High Purity – ensures removal of filter aids, salts, and fine particles.
• Consistent Quality – improves resin stability, curing behavior, and final product performance.
• Process Efficiency – reduces downtime and extends the life of downstream equipment.
• Versatility – suitable for a wide range of epoxy resin formulations and processing environments.
Application Fields
• Coatings – clean resin ensures smooth, defect-free finishes.
• Adhesives – purity enhances bonding strength and durability.
• Electronics – prevents electrical failures caused by conductive or ionic impurities.
• Composite Materials – guarantees uniform curing and mechanical performance.
With Great Wall’s SCP111 and 370g/270g filter papers, epoxy resin producers achieve stable, efficient, and reliable filtration performance — ensuring their resins meet the highest industrial standards.
