Two-Component PU Adhesive 143JQ for Filter Sealing
High-performance, solvent-free two-component polyurethane (PU) adhesive 143JQ specifically formulated for sealing and bonding HEPA filters, cabin air filters, and industrial filter elements. Offering a standard 4:1 weight ratio (A:B), it delivers outstanding adhesion to metal end caps, ABS/PP plastics, and fiberglass media. Optimized for automated dispensing systems—for high-precision potting, pair it with our Filter Gluing & Dispensing Machines.
Our Two-Component PU Adhesive 143JQ is an environmentally friendly, solvent-free polyurethane sealant designed specifically for high-precision bonding, sealing, and potting in the air purification and filtration industries.
Component A is composed of a modified polyol blend containing specialized functional reinforcement agents, and Component B consists of a high-purity isocyanate prepolymer. When mixed at the standard weight ratio of A:B = 4:1, the compound cures at room temperature to form a robust, semi-rigid polyurethane barrier. This adhesive provides exceptional hermetic sealing and extreme bonding strength between filter media (such as glass fiber or synthetic non-woven rolls) and end caps or frames made of galvanized sheet metal, aluminum, ABS, or PP plastics.
Technical Specifications
The factual mechanical parameters, mixing ratio, and curing properties of PU Adhesive 143JQ are detailed below:
Technical Parameters
Component A (Polyol Blend)
Component B (Isocyanate)
Appearance
White, black, or grey viscous liquid
Brown liquid
Viscosity (at 25°C, mPa.s)
4000 ± 500
200 ± 50
Relative Density (g/cm³)
1.35 ± 0.05
1.23 ± 0.03
Mixing Weight Ratio
100 (4 Parts)
25 (1 Part)
Gel Time (at 25°C)
4 – 8 minutes
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Tack-Free Time (at 25°C)
15 – 30 minutes
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Fully Cured Time
24 hours (Room temperature)
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Key Features & Performance Advantages
1. Exceptional Cross-Material Adhesion
Specifically engineered to bond dissimilar materials. It creates an unbreakable chemical bond between porous filter media (fiberglass, cellulose) and non-porous end cap substrates (galvanized steel, anodized aluminum, ABS, and polycarbonate plastics), ensuring no media detachment under pressure.
2. Fast Room-Temperature Curing
With a highly reactive gel time of 4–8 minutes at 25°C, it cures quickly without requiring high-temperature curing ovens. This drastically accelerates production cycles, saves energy costs, and reduces the carbon footprint of your filter assembly line.
3. Superior Fluid Sealing Integrity
The cured polyurethane has excellent chemical stability and structural elasticity. It resists shrinkage during curing, ensuring a 100% leak-proof, airtight joint that prevents bypass air in cleanroom-grade HEPA and ULPA filters.
4. Optimized for Automated Dispensing
Featuring an optimized viscosity profile, the adhesive flows smoothly through automated pumps and dosing valves. It is perfectly suited for high-speed automated dispensing without causing nozzle blockages, stringing, or dripping.
Target Applications
This high-strength two-component polyurethane sealant is widely used for sealing:
HEPA & ULPA Air Filters: Sealing and potting glass fiber media packs into aluminum, galvanized steel, or MDF frames for cleanrooms and hospital operating theaters.
Automotive Cabin HVAC Filters: Edge-bonding synthetic and active carbon media to plastic or cardboard borders.
Industrial Dust Collector Cartridges: Potting pleated polyester or cellulose elements into metal or plastic end caps.
Heavy-Duty Engine Air Filters: High-strength bonding of metal caps in high-vibration commercial truck and tractor intakes.
Why Partner with Fupei?
Machinery-Tested Formulation: As a filter machinery manufacturer, we test our PU Adhesive 143JQ directly on our own Filter Gluing & Dispensing Machines to guarantee optimal mixing, flow consistency, and zero dripping.
Customized Gel Time: We can adjust the curing speed and viscosity of the formula to match your specific automatic assembly line speed or ambient factory temperatures.
Strict Batch Quality Assurance: Every batch undergoes strict laboratory verification for viscosity, ratio tolerance, and hardness, ensuring consistent performance in high-volume automated manufacturing.
Frequently Asked Questions
A: Yes, absolutely. PU Adhesive 143JQ is specifically engineered for high-efficiency HEPA and ULPA filter potting. Because it features zero VOC emissions and extremely low shrinkage during curing, it guarantees a 100% airtight seal between the glass fiber media and the aluminum frame, preventing any bypass air leaks.
A: No, this is a room-temperature curing system. It achieves a gel state in 4–8 minutes and is tack-free within 15–30 minutes at 25°C. However, if you need to accelerate your production line, mild heating (such as 40°C–50°C) can be applied to speed up the cross-linking process.
A: Component B is an isocyanate-based prepolymer, which is highly sensitive to atmospheric moisture. It must be stored in tightly sealed, original containers in a dry, cool place (15°C to 25°C). Once opened, we recommend using a nitrogen blanket or sealing it immediately to prevent humidity from causing crystallization.
