RTV Silicone Potting Compound HN-8808A/B - Transparent, High Insulation for Visual Inspection
Product Overview for Silicone Potting Compound:
The HN-8808A/B Transparent Potting Compound is specifically designed for precision electronics that require ongoing monitoring or failure analysis. Its exceptional clarity allows for clear observation of internal components, circuitry, and potential issues (such as cold solder joints or corrosion) after potting, while providing top-tier insulation and environmental sealing. It is the ideal choice for achieving high product reliability and maintainability.
Key Performance Parameters for Silicone Potting Compound:
* Appearance (Mixed): Transparent elastomer
* Mix Ratio (A:B): 10 : 1 (by weight)
* Viscosity (A/B): Component A: 2200-2600 cP, Component B: 20-30 cP (GB/2794-1995)
* Density: 0.94±0.02 g/cm³ (GB/2794-1995)
* Pot Life (25°C): 40-60 minutes
* Cure Time (25°C): 4-6 hours (tack-free), 24 hours (full cure)
* Hardness (Shore A): 10-20 (GB/T531-1999)
* Volume Resistivity: >4.0×10¹⁴ Ω·cm (GB/T 31838.2-2019)
* Thermal Conductivity: 0.3±0.1 W/M·K (GB/T 38712-2020)
* Dielectric Strength: ≥14 kV/mm
* Dielectric Constant: ≤3.0
* Elongation at Break: ≤100%
Product Highlights for Silicone Potting Compound:
* Internal Visual Inspection: Maintains high transparency after curing for non-destructive internal inspection and failure analysis.
* Excellent Electrical Insulation: Extremely high volume resistivity and dielectric strength effectively prevent arc-over under high voltage.
* Lightweight Design: Lower density than conventional potting compounds helps reduce overall product weight.
* Stable Chemical Properties: Resistant to ozone, radiation, and weathering; non-corrosive to most substrates.
* Broad Service Temperature Range: Remains elastic and performs stably within a temperature range of -50°C to 200°C.
Application Areas for Silicone Potting Compound:
* Potting protection for precision sensors and current transformers
* Protection for high-end PCBs, facilitating rework and analysis
* Electronic modules with indicator lights, keeping signals visible
* Encapsulation for educational and research electronic models
* Aerospace electronics where weight is a concern
Detailed Operating Guide for Silicone Potting Compound:
1. Surface Preparation: Ensure surfaces to be potted are clean, dry, and free of grease. Conduct compatibility tests for sensitive substrates.
2. Accurate Weighing: Use a scale with 0.1g accuracy. Strictly follow the 10:1 weight ratio of Component A to Component B. *Note: The volume ratio is not 10:1 due to density differences. Always use weight ratio.*
3. Thorough Mixing: Mix the two components thoroughly for at least 2-3 minutes in a clean container until the color is completely uniform. Scrape the sides and bottom to ensure all material is mixed.
4. Vacuum Degassing: Pour the mixed compound into a vacuum chamber and degas at a vacuum of -0.095 MPa or higher for 2-5 minutes, until most bubbles collapse. *This step is crucial for achieving optically clear potting.*
5. Potting and Curing: Slowly pour the degassed compound into the device housing, allowing it to flow and fill naturally. Cure at 25°C and <70% relative humidity. Subsequent testing or handling can be done after 24 hours; final properties are achieved after 7 days.
Key Precautions for Silicone Potting Compound:
* Do Not Heat Cure: This is a condensation-cure system. Heating will cause internal bubbling and cracking. Heating to accelerate curing is strictly prohibited.
* Sealed Storage: Component B can absorb moisture from the air and degrade. Fillers in Component A may settle. Reseal containers immediately after use.
* Personal Protection: Wear gloves and safety glasses. Avoid contact with skin and eyes. In case of contact, rinse immediately with plenty of water and seek medical advice.
* Before Full Cure: Do not hermetically seal the device until the compound is fully cured (recommended after 7 days) to allow complete escape of by-product molecules.
Packaging & Storage for Silicone Potting Compound:
* Standard Packaging: 22kg/set (20kg A + 2kg B); 11kg/set (10kg A + 1kg B).
* Storage Conditions: Store in a cool, dry place away from direct sunlight. Ideal storage temperature: 10-30°C.
* Shelf Life: 6 months in original, unopened containers from date of manufacture.
FAQ for Silicone Potting Compound:
1. Q: Will the transparent potting compound turn yellow over time?
A: It exhibits excellent yellowing resistance when used continuously at or below the maximum rated 200°C. Slight changes may occur under extreme UV exposure outdoors, but protective properties remain unaffected.
2. Q: How to ensure the best transparency after potting?
A: The key step is vacuum degassing. Also, ensure mixing containers and tools are dry and clean to avoid contamination.
3. Q: What materials does it adhere well to?
A: It adheres well to most metals (aluminum, copper), plastics (PCB, ABS), and ceramics. Test compatibility with non-polar materials like PP, PE.
4. Q: Is a slightly tacky surface normal after curing?
A: Yes, a slight surface tack is normal for condensation-cure silicones and does not affect internal curing or overall protection.
5. Q: Can we get samples for testing?
A: Absolutely. We encourage testing before bulk orders. Please use the "Contact Us" form on our website to request free samples. Our technical team will assist you.
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