Low Outgassing Solvent Free Silicone Potting Compound with No Exotherm for Downhole Subsea Medical Instrument Encapsulation

Hanast HN-8806A/B is a solvent free, two-component platinum addition-cure silicone potting compound that cures with no exotherm and no by-product release, which keeps sensitive optics, sensors and sealed cavities free of volatile contamination. The 1:1 mix ratio, 2000-3000 mPa·s flow and 18-24 min pot life suit both dual-pump dispensing lines and manual potting benches, while the cured elastomer delivers 0.76 W/m·K thermal conductivity, UL 94 V-0 flame retardancy, 1.0 * 10¹⁶ Ω·cm volume resistivity and elastic service from -50 °C to 250 °C.

• Low outgassing, solvent free system — no solvent carrier and no by-products are released during cure, so sealed modules, optical parts and sensor cavities stay clean.
• No exotherm during cure — thick and deep sections cure without heat spikes that could stress bond wires, lenses or MEMS elements.
• Extremely low cure shrinkage — potted assemblies keep their dimensions; the 210 µm/(m·°C) coefficient of thermal expansion limits stress under thermal cycling.
• 1:1 mix ratio by weight — equal-part dosing for manual batching and dual-pump meter-mix equipment, 18-24 min pot life at 25 °C.
• 2000-3000 mPa·s viscosity — fills fine gaps and dense assemblies, and can be degassed under vacuum for void-free potting.
• 0.76 W/m·K thermal conductivity — transfers heat from power devices, sensors and coils into the housing.
• UL 94 V-0 flame retardancy and RoHS compliance — meets flammability and environmental requirements for EU and North American buyers.
• Electrical insulation 1.0 * 10¹⁶ Ω·cm and 25-30 kV/mm — dielectric strength for high-voltage spacing and dense circuitry.
• -50 °C to 250 °C, good ageing and moisture resistance — keeps elasticity through thermal cycling, humid-heat ageing, outdoor operation and winter transport.
• Custom colour and hardness, OEM private label — standard grade is grey 45 ± 5 Shore A; softer or firmer hardness and brand colours are produced on request.
• 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.

Where volatile contamination, moisture ingress or thermal stress decides field life, HN-8806A/B is used as the potting and encapsulating compound:

• Downhole tools, MWD / LWD telemetry modules and oil and gas instrument housings
• Subsea connectors, underwater sensors and marine instrument pods
• Medical device electronics, diagnostic instrument boards and sensor packages
• Aerospace and avionics modules, flight control boards and ground support electronics
• Rail transit control units, signal modules and trackside electronics
• Precision instrumentation, test and measurement boards and audio equipment
• Security and surveillance cameras, access control modules and outdoor sensors
• Power modules, IGBT modules, rectifier bridges and heat-dissipation boards
• EV battery packs, BMS boards, on-board chargers and AC/DC charging piles
• Solar inverters, photovoltaic junction boxes and energy storage BESS racks
• 5G base station power units, RRU modules and telecom equipment
• Smart meters, energy meters and grid monitoring terminals
• Transformers, inductors, ignition coils and magnetic components
• PCB / PCBA assemblies, automotive ECU, LED drivers and industrial control boards
• Robotics, UAV / drone electronics, underwater lights and household appliances
• Deep-section potted heaters, cable joints and moisture-proof encapsulation

• 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 where void-free potting or low outgassing performance matters.
• Step 5 - Potting: pour within the 18-24 min pot life and ensure complete coverage of the device.
• 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 and polysulfide compounds, amines, polyurethane rubber, ammonia-containing items, 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.

• Factory direct supply — manufactured in Shenzhen, Guangdong, China with 50 tons per month capacity.
• OEM / ODM private label — custom hardness, custom colour, drum labels and kit sizes for brand owners and distributors.
• Free sample — trial kit for engineering 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: Does HN-8806AB release solvents or by-products while curing?

A: No. The system is solvent free and cures by platinum addition without exotherm and without by-product release, which is why it is used for sealed sensor, optical and medical modules where volatile contamination is a risk.

Q2: Can the hardness and colour be customized for our OEM project?

A: Yes. The standard grade is a grey 45 ± 5 Shore A elastomer; softer or firmer hardness, brand colour matching and private label packaging are produced on request, subject to evaluation and MOQ.

Q3: Is the compound suitable for downhole and subsea instruments?

A: It offers 1.0 * 10¹⁶ Ω·cm volume resistivity, 25-30 kV/mm dielectric strength, good ageing and moisture resistance, and a -50 °C to 250 °C service range, so it suits downhole telemetry, subsea connectors and marine instrument housings.

Q4: How is the compound processed on the line?

A: Mix 1:1 by weight, degas under vacuum if void-free potting is required, then pour within the 18-24 min pot life. Cure takes 2-3 h at 25 °C as a preliminary cure or 12 min at 80 °C for heat-accelerated lines.

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 are available. Stock drums ship in 5-7 days, bulk orders in 10-15 days; OEM private label is available from our Shenzhen factory.

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.