Room Temperature Cure Repairable Silicone Potting Compound 1:1 RTV Silicone Encapsulant for Transformer Cable Joints

Room Temperature Cure Repairable Silicone Potting Compound HN-8806A/B

Not every potting job happens next to an oven. HN-8806A/B cures at 25 °C in 2-3 h with no heatrequired, which makes it usable for large castings, field and on-site potting of cable joints, and for heavyelectrical parts that cannot be baked. Unlike rigid epoxy, the cured 45 ± 5 Shore A elastomer can be cut back andre-potted when a unit needs repair, so a failed module does not become scrap. The two-component 1:1 system delivers0.76 W/m·K thermal conductivity, UL 94 V-0 flame retardancy, 25-30 kV/mm dielectric strength, 1.0 * 10¹⁶ Ω·cm volumeresistivity and a -50 °C to 250 °C service range, with 12 min at 80 °C available when a line does have heat.

Key Features

• Room temperature cure in 2-3 h at 25 °C — no oven, no heat tunnel and no thermal exposure of the component; suits large castings and on-site work.
• Optional 12 min cure at 80 °C — the same compound accelerates on production lines that do have heat.
• Repairable and reworkable — the cured elastomer can be cut back, the fault repaired and the cavity re-potted, unlike rigid epoxy castings.
• 18-24 min pot life, 2000-3000 mPa·s — enough time to fill a transformer or joint by hand, fluid enough to reach windings and terminals.
• 25-30 kV/mm dielectric strength and 1.0 * 10¹⁶ Ω·cm — insulation for windings, cable joints, busbars and terminals.
• UL 94 V-0 flame retardancy — flame-retardant encapsulation for switchgear, transformer and heater assemblies.
• 0.76 W/m·K thermal conductivity — conducts winding and joint losses into the housing or surrounding air.
• Extremely low cure shrinkage, CTE 210 µm/(m·°C) — no stress on windings, insulators and cable cores.
• Deep-section curing, no exotherm, no by-products — thick castings cure without internal stress or corrosive volatiles.
• -50 °C to 250 °C service range — stable elasticity through load cycling, outdoor service and winter transport.
• RoHS compliant, 6-month shelf life, non-dangerous goods transport — easy to ship to remote sites and store in a workshop.

Technical Specifications (HN-8806A/B)

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

Recommended Applications

• Dry-type and distribution transformers, potted windings and coil bodies
• Reactors, chokes and filter inductors
• Capacitor banks, power capacitors and capacitor modules
• Cable joints, cable terminations and cable branch boxes
• Switchgear, ring main units, CT / PT instrument transformers and bushings
• Potted heaters, heating elements and thermal fuses
• Power modules, IGBT modules and rectifier bridges
• PCB / PCBA assemblies, LED drivers and industrial control boards
• EV battery packs, BMS boards and charging pile modules
• Sensors, transducers, pressure sensors and controllers
• Pumps, valves, actuators and solenoid coils
• Wind turbine and offshore platform electrical units
• Marine and subsea power and instrument housings
• Rail transit traction modules and trackside electronics
• Robotics, UAV power boards and household appliances
• On-site and field potting where no curing oven is available

Mixing & Application Instructions

1. Step 1 - Pre-mix: stir Component A and Component B separately before use, fillers may settle in storage; reseal containers tightly.
2. Step 2 - Weighing: weigh A and B at exactly 1:1 by weight on a precision scale.
3. Step 3 - Mixing: mix in one direction to limit air entrapment; scrape the container walls and bottom.
4. Step 4 - Degassing: degas under vacuum where void-free potting is required.
5. Step 5 - Potting: pour within the 18-24 min pot life and ensure complete coverage of windings, cores and terminals.
6. Step 6 - Curing: leave 2-3 h at 25 °C for room temperature cure, or 12 min at 80 °C when heat is available; do not stress the part during cure.

Cure Inhibition Notice

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.

Wholesale Supply & OEM Service

• 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 room temperature cure and repair trials 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.

FAQ

Q1: Can HN-8806AB cure without an oven?

A: Yes. It cures at 25 °C in 2-3 h as a preliminary cure with no heat source, so large castings, field work andheat-sensitive components can be potted on site. If a line does have heat, 12 min at 80 °C speeds up the samecompound.

Q2: Is the potting repairable if a unit fails?

A: Yes. The cured elastomer is a flexible 45 ± 5 Shore A silicone, so it can be cut back, the fault repaired and thecavity re-potted. Rigid epoxy castings cannot be reworked this way.

Q3: Is HN-8806AB suitable for transformers and cable joints?

A: It provides 25-30 kV/mm dielectric strength, 1.0 * 10¹⁶ Ω·cm volume resistivity, UL 94 V-0 flame retardancy and0.76 W/m·K thermal conductivity, with an 18-24 min pot life that allows windings and joints to be filledcompletely.

Q4: What happens to the compound at high and low temperature?

A: The service range is -50 °C to 250 °C. With a 210 µm/(m·°C) coefficient of thermal expansion and extremely lowcure shrinkage, windings, insulators and cable cores are not stressed during load cycling.

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.

About Hanast

Shenzhen Hanast New Materials Co., Ltd. manufactures liquid silicone materials at a production base in Guangdong, China, supplying addition-cure (platinum) and condensation-cure silicone for electronic potting, thermal management and mould making. Every lot ships with TDS and MSDS documentation and is compliant with RoHS and UL 94 V-0 requirements.