BZ-2318-2WK: Low-Water-Absorption Transparent Polyurethane for Temperature-Sensitive Electronics
Product Description
BZ-2318-2WK is a two-component polyurethane encapsulant optimized for temperature-sensitive electronic devices, offering low water absorption, high flexibility, and reliable waterproofing without requiring heat curing. With a 1:1 weight mix ratio and Shore A hardness of 50±5, it provides low-stress protection and easy application for components operating in humid environments where heat curing is not feasible. This adhesive complies with RoHS and REACH standards, ensuring suitability for international markets and reducing environmental impact.
Technical Parameters
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metric
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Curing Agent BZ-2318-2WK A Adhesive
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Active ingredient: BZ-2318-2WK B adhesive
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liquid parameters
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surface
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transparency liquid
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Yellowish transparent liquid
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Viscosity (cps. 25°C)
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1300±500
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900±300
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Initial mixed viscosity (cps. 25°C)
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1100±300
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Density (g/cm³ at 25°C)
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1.02±0.05
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1.03±0.05
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mixing and curing
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Use the ratio (by weight)
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A:B=1:1
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Operational time: 130±30g (at minimum 25°C)
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30±5 min
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condition of cure
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normal temperature cure
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Drying time (H.25℃)
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5-6
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Curing time (H.25℃)
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10-12
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Curing time: 30g (heated)
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Heating curing is not recommended
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Hardness after curing (Shore A)
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50±5
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After curing
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Temperature range (°C)
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-40~85℃
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Water absorption rate (24H)
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≤0.5%
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Surface resistivity (Ω/sq)
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≥1.0×1010
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Volume resistivity (Ω·cm)
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≥1.0×1010
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Tensile strength (MPa)
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≤5
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Tensile elongation (%)
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≥200%
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Dielectric constant (at 50Hz)
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≤8
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Breakdown voltage (kV/mm)
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≥15
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Product Applications
- Humidity-Sensitive Smart Sensors: Encapsulates humidity and temperature sensors in smart home systems, providing protection against moisture ingress while maintaining accurate readings in high-humidity environments.
- Medical Electronic Devices: Seals control circuits and sensors in portable medical devices such as blood glucose monitors and pulse oximeters, providing low-stress protection and ensuring reliable performance in clinical settings.
- Outdoor Low-Power IoT Devices: Encapsulates control modules in solar-powered outdoor sensors, providing waterproofing and UV resistance without requiring heat curing, ideal for remote installations with limited power access.
- Bathroom Electronics: Seals control circuits in smart bathroom fixtures such as automatic soap dispensers and toilet flush systems, providing protection against water splashes and high humidity.
- Automotive Under-Hood Electronics: Encapsulates sensors and control modules in vehicle under-hood environments, providing protection against vibration and temperature fluctuations while avoiding heat curing that could damage sensitive components..
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 metal or plastic drums.
Resin: Typically 5KG/ 10KG / 20KG 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.
FAQ
Q1: Can this potting compound be used for outdoor electronic applications?
A2: Yes, the weather-resistant properties of this transparent polyurethane potting compound make it suitable for outdoor use, providing protection against UV rays, rain, and temperature fluctuations.
Q2: What are the main features of the Weather-Resistant Transparent Polyurethane Potting Compounds?
A1: This potting compound offers excellent weather resistance, high transparency, strong adhesion, and durability, making it ideal for protecting electronic components from moisture, dust, and environmental damage.
Q3: What types of electronics are compatible with this potting compound?
A5: It is compatible with a wide range of electronic components, including circuit boards, sensors, connectors, and LED assemblies, especially those requiring clear encapsulation and protection from harsh environmental conditions.
Q4: Is the compound easy to apply and cure?
A3: Yes, the potting compound has good flow characteristics for easy application and typically cures at room temperature, forming a tough and flexible protective layer.
Q5: Does the transparent nature of the compound affect its protective qualities?
A4: No, the transparency of the polyurethane potting compound does not compromise its protective features; it still provides excellent insulation and environmental protection while allowing visual inspection of the encapsulated components.
