Ultra-Flexible Polyurethane Potting Compound For MBR Membrane Root Protection
BZ-6900-3 is a two-component polyurethane potting compound specifically designed for root protection of MBR (Membrane Bioreactor) membranes. With exceptional fluidity for easy penetration into membrane bundles, long-term flexibility retention, and compliance with RoHS and REACH regulations, it provides reliable protection against mechanical stress and chemical exposure across -40~100℃. This formula features low water absorption (≤0.5%) and excellent adhesion to membrane materials, ensuring the integrity of MBR systems in wastewater treatment applications.
Key Product Features
- Outstanding fluidity: Low mixed viscosity (650±200 mPa·s at 25℃) for easy penetration into tight membrane root gaps
- Long pot life: 30±5 minutes at 25℃, allowing sufficient time for complex potting operations
- Ultra-flexible: Shore A 45±15 hardness with ≥50% elongation at break, absorbing membrane vibration and thermal expansion
- Wide temperature tolerance: Stable performance from -40 to 100℃, suitable for fluctuating wastewater treatment environments
- Dual compliance: Meets RoHS and REACH regulations for eco-friendly industrial use
- Strong adhesion: Bonds tightly to MBR membrane materials, preventing root displacement and ensuring long-term system integrity
- Rapid curing options: Full cure in 4.5±1 hours at room temperature; ≤60 minutes with 60℃ heating for accelerated production
Technical Parameters
|
Parameters
|
Hardener
BZ-6900-3R A
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Resin
BZ-6900-3R B
|
|
Before curing
|
Appearance
|
Light yellow liquid
|
Light yellow liquid
|
|
Viscosity(mPa·s.25℃)
|
1300±500
|
500±150
|
|
Initial mixed viscosity(mPa·s.25℃)
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650±200
|
|
Density(g/cm³.25℃)
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1.14±0.05
|
1.03±0.05
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|
Mixing
&
Curing
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Mix ratio(by weight)
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A:B=40:100
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|
Pot life 130±30g(min.25℃)
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30±5 min
|
|
Curing condition
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Room temperature curing
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|
Surface drying time 30g(H.25℃)
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3±1
|
|
Curing time 30g(H.25℃)
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4.5±1
|
|
Curing time(Heated)
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60℃ heated ≤60min
|
|
After curing
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Color
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Light yellow
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|
Hardness (Shore A)
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40±5
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|
Temperature resistance(℃)
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-40~100℃
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|
Water absorption(24H)
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≤0.5%
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|
Thermal conductivity(W/m.k)
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---
|
|
Surface resistivity(Ω/sq)
|
＞1.0×1010
|
|
Volume resistivity(Ω.cm)
|
＞1.0×1011
|
|
Tensile strength(MPa)
|
---
|
|
Elongation at break(%)
|
≥50%
|
|
Dielectric constant(at 50Hz)
|
≥6
|
Product Applications
- MBR Membrane Root Protection: Encapsulates membrane roots in wastewater treatment systems, preventing mechanical damage and chemical corrosion
- Membrane Module Sealing: Seals gaps between membrane bundles and module frames, ensuring efficient filtration and reducing maintenance costs
- Wastewater Treatment Equipment: Protects sensitive components in bioreactor systems from harsh chemical exposure and temperature fluctuations
- Industrial Filtration Membranes: Provides flexible encapsulation for microfiltration and ultrafiltration membranes in food processing and pharmaceutical industries
Directions for Use
- Pre-potting Preparation: Calibrate scales, prepare potting tools, cleaning tools, check machine settings, check vacuum pump force, etc.
- Product Pre-treatment: Place product on a level surface or fixture. Remove dust, clean, degrease, and dry if necessary.
- Accurate Proportioning: Manual operation requires precise mixing according to the specified ratio and recording. Machine potting requires calibrated ratios and first-article confirmation is recommended.
- Mixing & Stirring: Manual operation requires thorough stirring or using electric stirrers to ensure homogeneous mixing. Machine potting requires sufficient stirring speed, adjust as needed.
- Uniform Potting: Manual operation should be done in small, multiple batches to ensure uniformity. Machine potting should follow the programmed path for quantitative dispensing.
- Inspection or Secondary Potting: After potting, visually inspect as needed. Perform touch-up, bubble removal, or secondary potting if required.
- Curing: Allow the potted and inspected products to cure at room temperature or with heat assistance (recommended 60°C if needed), according to product and process requirements.
- Final Product Confirmation: Perform visual inspection and performance testing as required by the customer.
Packing & Shipping & Storage
- Hardener: Typically 5KG/10KG/20KG/200KG metal or plastic drums.
- Resin: Typically 10KG/20KG/200KG metal or plastic drums.
- Store and transport as a general chemical product.
- Store sealed, protected from light at room temperature. Shelf life varies from 6 to 12 months depending on packaging; please refer to the expiry date on the shipping package.
- When temperature drops to 15°C or lower, the hardener or resin should be stored in a warm place or heated before use for potting. Specific heating recommendations depend on the temperature drop; please communicate and consult with us.
