DOW SYLGARD 184 PDMS Silicone Elastomer Kit for PCB Potting, Encapsulation and Mold Casting

SYLGARD 184 PDMS Silicone Elastomer Kit Benefits

SYLGARD 184 PDMS Silicone Elastomer Kit forms a transparent protective layer around sensitive components while allowing visual inspection after curing. The cured silicone provides electrical insulation, mechanical protection, stress relief and resistance to environmental exposure. Its flexible elastomeric structure helps absorb vibration, impact and stress caused by differences in thermal expansion between electronic components, circuit boards and housings.

The two parts are mixed at a straightforward 10:1 base-to-curing-agent ratio by weight. This familiar formulation supports manual preparation, laboratory processing and controlled industrial dispensing. The mixed material has a typical working time of approximately 78 minutes at 25°C, allowing sufficient time for mixing, vacuum degassing, casting and component positioning before the viscosity increases.

Applications for SYLGARD 184 PDMS Silicone Elastomer Kit

Dow recommends this silicone elastomer for potting printed circuit board assemblies, power supplies, connectors, sensors, transformers, amplifiers, industrial controls, high-voltage resistor packs and relays. The transparent cured material is particularly useful where protected components must remain visible for inspection, testing or troubleshooting.

SYLGARD 184 PDMS Silicone Elastomer Kit is also widely evaluated for transparent mold casting, replica molding, laboratory prototypes, optical assemblies and microfluidic device development. Its combination of flow, dimensional stability and flexible demolding makes it useful for reproducing detailed surfaces and forming clear elastomeric components. Each non-electronic application should be tested under actual manufacturing and service conditions.

The material is not intended to provide strong structural adhesion to every untreated substrate. Where adhesion to metals, glass, ceramics or plastics is critical, suitable surface cleaning, plasma treatment or an approved Dow primer may be required. Substrate compatibility and adhesion should be validated before commercial production.

SYLGARD 184 PDMS Silicone Elastomer Kit Technical Properties

The mixed product is transparent and has a typical viscosity of approximately 3,500 mPa·s and a specific gravity of about 1.03 at 25°C. After curing, its typical hardness is approximately 43 Shore A, providing a firm silicone rubber that remains flexible enough to relieve stress around protected components.

Typical electrical properties include dielectric strength of approximately 450 volts per mil, dielectric constant of 2.72 at 100 Hz and volume resistivity of approximately 2.9 × 10¹⁴ Ω·cm. Thermal conductivity is approximately 0.27 W/m·K. The product is UL recognized, with published references including UL 94 V-1 and UL 746C classifications.

These values are typical product data rather than guaranteed purchasing specifications. Final performance depends on the mixing ratio, mixing quality, air removal, curing schedule, part thickness, substrate condition and operating environment.

How to Use SYLGARD 184 PDMS Silicone Elastomer Kit

Ensure all containers, tools and application surfaces are clean, dry and free from incompatible residues. Weigh ten parts of the silicone base and one part of the curing agent, then mix thoroughly while scraping the sides and bottom of the container. Avoid introducing unnecessary air during mixing.

Vacuum degassing is recommended when bubbles could affect electrical protection, transparency, surface quality or mold accuracy. Pour or dispense the mixed silicone slowly into the prepared assembly or mold and allow trapped air to escape. The product can cure for approximately 48 hours at 25°C or be heat accelerated using representative schedules of 35 minutes at 100°C, 20 minutes at 125°C or 10 minutes at 150°C.

Why Choose SYLGARD 184 PDMS Silicone Elastomer Kit?

SYLGARD 184 PDMS Silicone Elastomer Kit combines transparency, electrical insulation, flexible protection, controlled flow and multiple curing options in a well-established silicone system. It is a dependable choice for PCB encapsulation, sensors, power supplies, transformers, relays, laboratory casting and precision PDMS molding.

Review the official Dow SYLGARD 184 product information and current Safety Data Sheets before qualification or production use. Explore our silicone encapsulants for additional electronic potting, insulation and environmental-protection solutions.