25-30 kV/mm Dielectric Strength UL 94 V-0 Flame Retardant 1:1 Mix Ratio Silicone Potting Compound RTV Silicone Encapsulant for EV Charging Piles

HN-8806A/B is a two-component RTV addition-cure silicone potting compound built for high-voltage powerelectronics. It mixes 1:1 by weight, flows at 2000-3000 mPa·s and cures at room temperature or in 12 min at 80 °C into a45 ± 5 Shore A grey elastomer rated for 25-30 kV/mm dielectric strength and 1.0 * 10¹⁶ Ω·cm volume resistivity. WithUL 94 V-0 flame retardancy, 0.76 W/m·K thermal conductivity, deep-section curing without voids and a -50 °C to 250 °Cservice range, it is used to insulate, cool and mechanically protect EV charging piles, battery packs, BESS racks andother high-voltage assemblies.

• 25-30 kV/mm dielectric strength — supports creepage and clearance design in high-voltage modules, charging piles and battery packs.
• 1.0 * 10¹⁶ Ω·cm volume resistivity — high electrical insulation for busbars, terminals and dense power assemblies.
• UL 94 V-0 flame retardancy — flame-retardant encapsulation for battery packs, energy storage racks and charging equipment.
• 0.76 W/m·K thermal conductivity — transfers heat from busbars, IGBT modules and battery cells into the housing.
• Deep-section curing without voids — cures through thick sections with no exotherm and no by-products; degas under vacuum for void-free high-voltage potting.
• Extremely low cure shrinkage, CTE 210 µm/(m·°C) — keeps busbar and terminal spacing stable through thermal cycling.
• -50 °C to 250 °C service range — retains elasticity through power cycling, winter transport and high-temperature operation.
• 1:1 mix ratio, 18-24 min pot life, 2000-3000 mPa·s — equal-part dosing for manual potting and dual-pump dispensing lines.
• Dual cure schedule — 2-3 h at 25 °C for large cavities, 12 min at 80 °C for volume lines.
• RoHS compliant, non-corrosive, no by-products — no attack on copper, aluminium or plated terminals.
• 6-month shelf life, non-dangerous goods transport — general chemical classification simplifies export and warehousing.

All values are measured under standard conditions (25 °C, 50-60% RH) after the recommended cure schedule and are for reference only.

Wherever a module combines high voltage, heat and moisture, HN-8806A/B provides the insulation and thermal path:

• AC and DC EV charging piles, charging posts and charging gun connectors
• On-board chargers, DC-DC converters and EV battery packs
• BMS slave and master boards, cell sampling harness encapsulation
• Energy storage BESS racks, PCS cabinets and battery cluster modules
• Solar inverters, photovoltaic combiner boxes and junction boxes
• 5G base station power units, RRU modules and telecom rectifiers
• Smart meters, energy meters and grid RTU terminals
• IGBT modules, power modules and rectifier bridges
• Busbars, capacitor banks, relays, contactors and fuse holders
• High-voltage junction boxes, terminal blocks and cable joints
• Transformers, inductors and magnetic components
• PCB / PCBA assemblies and automotive ECU boards
• Sensors, controllers and industrial control units
• Rail transit traction modules and trackside electronics
• Offshore wind converters, marine battery systems and subsea power units
• Robotics, UAV power boards, LED drivers and household appliances

• Step 1 - Pre-mix: stir Component A and Component B separately before use, fillers may settle in storage; reseal containers tightly.
• Step 2 - Weighing: weigh A and B at exactly 1:1 by weight on a precision scale.
• Step 3 - Mixing: mix in one direction to limit air entrapment; scrape the container walls and bottom.
• Step 4 - Degassing: degas under vacuum to remove air before high-voltage potting; voids reduce dielectric withstand.
• Step 5 - Potting: pour within the 18-24 min pot life and ensure complete coverage of terminals and busbars.
• Step 6 - Curing: cure 2-3 h at 25 °C or 12 min at 80 °C; do not move or stress the part during cure.

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

• Factory direct supply — manufactured in Shenzhen, Guangdong, China with 50 tons per month capacity.
• OEM / ODM private label — custom colour, drum labels and kit sizes for brand owners and distributors.
• Free sample — trial kit for dielectric and process validation before bulk ordering.
• Wholesale pricing on bulk orders — 25 kg drums or 50 kg A+B kit sets, export carton on pallet.
• Technical documents — TDS, MSDS and handling guidance issued with every shipment.
• Delivery — 5-7 days for stock drums, 10-15 days for bulk production orders.

Q1: What dielectric performance does HN-8806AB provide for high-voltage modules?

A: Dielectric strength is 25-30 kV/mm and volume resistivity is 1.0 * 10¹⁶ Ω·cm, with UL 94 V-0 flame retardancy, sothe compound suits EV charging piles, battery packs, BESS racks and high-voltage junction boxes.

Q2: Is HN-8806AB suitable for EV charging piles and energy storage racks?

A: Yes. It combines high-voltage insulation, 0.76 W/m·K thermal conductivity and a -50 °C to 250 °C service range,which covers outdoor charging equipment and battery clusters that see heat, moisture and thermal cycling.

Q3: How do I avoid voids in thick high-voltage potting?

A: Mix 1:1 by weight, degas under vacuum before pouring, and pot within the 18-24 min pot life. The compound curesthrough deep sections with no exotherm and extremely low shrinkage, so thick modules fill without internal stress.

Q4: What cure schedule can I use on my line?

A: Cure 2-3 h at 25 °C as a preliminary room temperature cure for large cavities, or 12 min at 80 °C forheat-accelerated production lines; both give the same grey 45 ± 5 Shore A elastomer.

Q5: What are the MOQ, packaging and lead time?

A: Standard packaging is 25 kg per component drum, 50 kg per A+B kit set; a 1 kg trial kit and free sample areavailable. Stock drums ship in 5-7 days, bulk orders in 10-15 days. OEM private label is available from our Shenzhenfactory.