High-Rigidity Polyurethane Potting Compound for Filters
BZ-6906-K is a two-component polyurethane potting compound engineered for structural bonding and sealing of high-efficiency filters, air filters, and oil filters. With rapid room-temperature curing (full cure in 2±1 hours), high Shore D hardness (68±8), and excellent electrical insulation (breakdown voltage ≥20 kV/mm), it provides robust mechanical stability and long-term durability across -40~120℃. Compliant with RoHS regulations, this formula features low water absorption (≤0.5%) and strong adhesion to metal, plastic, and filter media, ensuring leak-proof performance in demanding industrial environments.
Key Product Features
- Rapid curing: Full cure in 2±1 hours at 25℃; ≤45 minutes with 60℃ heating for flexible production scheduling
- 1:2 mix ratio: Easy proportioning, minimal material waste, compatible with automated dispensing systems
- High rigidity: Shore D 68±8 hardness with ≥35% elongation, ideal for structural filter bonding applications
- Superior insulation: Breakdown voltage ≥20 kV/mm, volume resistivity >1.0×10¹¹ Ω·cm for reliable electrical safety
- Wide temperature tolerance: Stable performance from -40 to 120℃, suitable for extreme industrial conditions
- RoHS compliant: Meets international environmental standards for consumer and industrial use
- Strong adhesion: Bonds tightly to metal, plastic, and filter media, preventing leaks and ensuring long-term product longevity
Technical Parameters
|
Parameters
|
Hardener
BZ-6906-K A
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Resin
BZ-6906-K B
|
|
Before curing
|
Appearance
|
Light yellow liquid
|
Beige liquid
|
|
Viscosity(mPa·s.25℃)
|
250±100
|
18000±4000
|
|
Initial mixed viscosity(mPa·s.25℃)
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5000±1500
|
|
Density(g/cm³.25℃)
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1.21±0.05
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1.72±0.05
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Mixing
&
Curing
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Mix ratio(by weight)
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A:B=1:2
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|
Pot life 130±30g(min.25℃)
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8±3min
|
|
Curing condition
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Room temperature curing
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Surface drying time 30g(min.25℃)
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45±10 min
|
|
Curing time 30g(H.25℃)
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2±1H
|
|
Curing time(Heated)
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60℃ heated ≤45min
|
|
After curing
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Color
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Beige
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|
Hardness (Shore D)
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68±8
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Temperature resistance(℃)
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-40~120℃
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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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≥0.3
|
|
Breakdown voltage(kV/mm)
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≥20
|
|
Surface resistivity(Ω/sq)
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＞1.0×1010
|
|
Volume resistivity(Ω.cm)
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＞1.0×1011
|
|
Tensile strength(MPa)
|
≥1
|
|
Elongation at break(%)
|
≥35%
|
|
Dielectric constant(at 50Hz)
|
≥6
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Product Applications
- High-Efficiency Filters: Structural bonding of HEPA/ULPA filter frames and media, providing airtight seals and mechanical stability in cleanrooms, hospitals, and data centers
- Air Filters: Seals automotive cabin filters and industrial HVAC filters, enhancing filtration efficiency by eliminating air bypass around filter edges
- Oil Filters: Bonds filter media to metal end caps in automotive and industrial oil filters, withstanding high-pressure fluid flow and vibration
- Industrial Filtration Systems: Seals hydraulic filters, fuel filters, and water treatment filters, resisting chemical exposure and temperature fluctuations
- Filter Control Modules: Encapsulates sensor circuits and control electronics in smart filter systems, protecting against dust, moisture, and electrical interference
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.
