CTE Matched 210 µm/(m·C) UL 94 V-0 Flame Retardant 1:1 Mix Ratio Silicone Potting Compound and Silicone Encapsulant for Rail Transit Wind Power Marine Electronics

CTE Matched 1:1 Silicone Potting Compound HN-8806A/B for Rail Transit, Wind Power and Marine Power Electronics

HN-8806A/B is a two-component platinum addition-cure silicone potting compound mixed at 1:1 by weight from a white and a grey 2000-3000 mPa·s liquid. It cures at room temperature in 2-3 hours or in 12 minutes at 80 C into a 45 ± 5 Shore A elastomer with a coefficient of thermal expansion of 210 µm/(m·C), 0.76 W/m·K thermal conductivity, 1.0 × 10¹⁶ Ω·cm volume resistivity, 25-30 kV/mm dielectric strength and UL 94 V-0 flame retardancy over −50 C to 250 C. Because the cured compound expands and contracts close to aluminium and steel housings and releases no heat or by-products, thick castings for rail, wind and marine power electronics cure without internal stress, cracking or corrosion of sealed parts.

Key Features

• CTE 210 µm/(m·C) matched to metal housings - low differential expansion against aluminium and steel enclosures keeps solder joints, busbars and heavy castings crack-free through thermal cycling.
• Extremely low cure shrinkage, no exotherm - addition cure releases no heat and no by-products, so 30-50 mm deep castings cure without voids or internal stress.
• No corrosion to sealed components - neutral cure chemistry protects sealed relays, terminals and metallised surfaces in humid and salt-laden air.
• UL 94 V-0 flame retardancy with RoHS compliance - meets rail, wind and marine equipment flammability and market-access requirements.
• 25-30 kV/mm dielectric strength, 1.0 × 10¹⁶ Ω·cm - insulation for traction converters, inverter stacks and high-voltage terminal blocks.
• −50 C to 250 C service range - thermal shock stability from cold-start to power-cycle heat loads in outdoor cabinets and nacelles.
• 0.76 W/m·K thermal conductivity - transfers heat from power devices and magnetics into the enclosure wall or cold plate.
• 1:1 mix ratio, 18-24 min pot life - meter-mix, cartridge or manual batch processing with enough time for degassing and multi-cavity filling.
• Bulk supply in 25 kg barrels - Component A 25 kg plus Component B 25 kg, 50 kg per set, with TDS, MSDS and batch COA.

Mixing and Application

1. Pre-mix - stir Component A and B separately before use because fillers may settle; reseal containers immediately.
2. Weigh - weigh A and B at exactly 1:1 by weight on a precision electronic scale.
3. Mix - mix in one direction and scrape the walls and bottom; uneven mixing causes local incomplete cure.
4. Degas (optional) - vacuum degas for void-sensitive traction converter and inverter stack assemblies.
5. Pot - pour within the 18-24 min pot life and ensure complete coverage of terminals, busbars and windings.
6. Cure - 12 min at 80 C or 2-3 hours at 25 C; do not move or stress the part during cure.

Application Coverage

HN-8806A/B is specified for insulation, moisture proofing, thermal management and mechanical protection in the following assemblies:

Rail transit

• Traction converter potting - traction converter power stack, IGBT driver board and gate drive module encapsulation.
• Auxiliary power unit - auxiliary converter, battery charger module and train control electronics.
• Trackside and signalling - trackside signalling unit, point machine controller and wayside power supply.

Wind power and marine

• Wind turbine converter - wind power converter, pitch control module, nacelle control electronics and hub slip-ring board.
• Offshore and marine - offshore platform power unit, deck control box, marine power supply and salt-laden air exposed enclosures.
• Harsh environment cabinets - outdoor cabinet, coastal installation and humidity-exposed connector encapsulation.

Power electronics

• Converter and inverter - DC-DC converter, OBC, motor drive, PV inverter and power stack encapsulation.
• Power module - IGBT module, MOSFET module, SiC power device and rectifier bridge.
• Transformer and reactor - transformer, inductor, reactor and choke winding encapsulation.
• Power supply - industrial power supply, UPS module, energy storage PCS board and charging module.

Industrial and general electronics

• Control and sensing - PLC module, industrial controller, sensor, transducer and energy meter board.
• PCB and connector - PCBA, terminal block, connector and relay encapsulation.
• Motor and pump - motor stator, coil encapsulation and submersible pump electronics.
• Lighting and appliances - LED driver, street lamp driver and appliance control board.

Technical Data (TDS HANAST-TDS-004 Rev.1)

Before Mixing (Uncured Components)

After Mixing (A + B)

Cured Properties

Values are measured at 25 C and 50-60% RH after the recommended cure schedule and are for reference only.

Cure Inhibition Notice

This addition-cure silicone may fail to cure in contact with organotin or tin-containing silicones, sulfur and polysulfide compounds, amine or ammonia-containing items, polyurethane rubber, phosphorus compounds, organic acids and solder flux residues. Clean substrates and tools before potting and do not mix with condensation-cure (acetoxy) silicone, epoxy or polyurethane.

Packaging, Bulk Supply and Documentation

• Bulk kit - Component A 25 kg plastic barrel plus Component B 25 kg plastic barrel, 50 kg per A+B set.
• Documentation - TDS, MSDS, RoHS declaration and batch COA with every shipment for rail, wind and marine project approval.
• Stock and lead time - stock sets ship in 3-7 working days, bulk production in 10-15 days.
• Storage - 6 months shelf life in original sealed containers at 25 C, protected from sunlight and moisture.
• Transport - classified as non-dangerous goods (general chemicals), barrels palletised to prevent leakage.
• Supply capacity - 50 tons per month with OEM and private label service.

FAQ

About Hanast

Shenzhen Hanast New Materials Co., Ltd. manufactures liquid silicone materials for electronic potting, thermal management and mould making, supplying OEM and private label programmes worldwide. Every lot ships with TDS and MSDS documentation and complies with RoHS and UL 94 V-0 requirements.