Why silicones
Silicone properties are ozone resistant and naturally stable under a wide range of temperatures, moisture, and other environmental conditions. Dow silicones are unique materials with a useful temperature range from -115°C to 260°C, and these materials are highly stress relieving, with a modulus that commonly ranges from 0.01 to 10 MPa.
| Product family | Features and benefits |
| Adhesives, sealants, and foams | • Outperform and outlast organics under demanding conditions • Remain flexible over a wide temperature range • Reliable adhesion to a variety of substrates • Light-weighting and perfect sealing |
| Coatings, gels, and encapsulants | • Protect against moisture, dirt, shock, and vibration and heat fluxes • Are stress-relieving and dimensionally stable • Have minimal shrinkage |
| Liquid silicone rubbers (LSRs) | • Ease of processing • Good mechanical properties • Excellent resistance to extreme temperatures and aging |
| Optically clear materials | • Offer high performance even in harsh environments • Range from dispensable to moldable solutions • Allow design flexibility for lighting, electronics, and displays |
| Thermal interface, and electrically-conductive materials | • Provide wide-range solutions for effective thermal management of sensitive electronics • Offer broad choice of thermal conductivity • Fill oddly-shaped gaps • High EMI-shielding effectiveness with electrically conductives |
Aircrafts, helicopters & drones
Proven solutions
Piloted aircraft and unmanned aerial vehicles (UAVs), or drones, need environmental sealing, adhesive bonding, thermal management, and protection against electromagnetic interference (EMI). Fixed wing and rotary wing aircraft also demand proven performance, especially for critical electronic components. Whether an aircraft is fuel-powered or battery-driven, engineers expect materials to help solve design challenges. The aircraft industry needs to meet strict safety standards, too.
Multi-purpose and solvent-resistant fluorosilicone sealants from Dow deliver required performance. DOWSIL™ adhesives, sealants, and foams are not only used for exterior and interior applications, but also as the gaskets for compressors, gearboxes, and pumps. Solvent resistant sealants support the assembly and repair of fuel systems and tanks. These advanced silicones are also used for bonding substrates to heat sinks in transmission, power, and conversion modules as well as bonding integrated circuit substrates, attaching heat sinks, and adhering lids, housings, and base plates.
More electric aircrafts benefit from DOWSIL™ thermal-management solutions for the battery and battery systems.
Defense
Mission-critical performance
Whether by air, land, or sea, military missions demand proven solutions to some of engineering's toughest challenges. Military operations also need materials that deliver optimal performance in challenging conditions such as desert heat, arctic cold, and jungle rains. With their unique balance of properties, Dow silicones combine high levels of stress relief with reliable environmental resistance.
DOWSIL™ coatings, gels, and encapsulants resist shock and stress, while dampening vibrations, and providing good flame resistance. Many of these products are MIL-SPEC tested and Underwriter Laboratories (UL) approved.
Avionics, displays & lighting
Electronics, sensors, and illumination
Whether they're flying us home or across the globe, aviation pilots need to see in order to keep us safe. They need to see fuel levels. They need to see air traffic. They need to see flight control avionics, displays and lighting support communications, navigation and monitoring in the cockpit and beyond. As our skies get busier, flight recorders and collision avoidance systems are becoming more important, too.
From flight displays to cockpit, from instrument and cabin lighting to navigation light, engineers need rugged, reliable solutions. DOWSIL™ optically clear materials resist temperature, humidity, and other environmental extremes. Even the miniature lamps or displays in cabin interiors require the right protection and performance.
For dissipating heat, Dow's thermally-conductive materials provide reliable cooling solutions for electronics, modules, and assemblies. DOWSIL™ electrically-conductive materials ensure high-shielding effectiveness from electromagnetic interference in the wide range of frequencies.
Spaceships & satellites
Mission-critical systems
Spaceships and satellites operate in high-vacuum environments where outgassing can disrupt electronic systems, optical devices, and thermal radiators. Sealants and encapsulants that release high levels of volatiles can degrade the performance of electronics and sensors. Released gases from materials with high levels of volatiles can also condense on camera lenses. Space-grade silicones from Dow meet NASA requirements for low thermal vacuum outgassing. They also provide good physical and electrical stability over a wide temperature range. DOWSIL™ space-grade encapsulants are available in flowable and thixotropic versions, and used with modules, relays, power supplies, delay lines, cable connectors, and complete electronics assemblies.
Low-outgassing silicones for spaceships and satellites include controlled-volatility sealants with low levels of collected volatile condensable materials (CVCMs), and high elongation for stress relief (according to ASTM E595).
New frontiers
Constant innovation
Experts from around the world are evaluating asteroid mining, a return trip to the Moon, and a manned mission to Mars. Achieving these goals will require a growing number of launches, which is why engineers need the right material solutions for launch equipment protection.
The thermal energy from rocket plumes can cause ablation to flame trenches made of concrete, refractory brick, and steel. That's why Dow provides ablative materials for protecting launch platforms and rocket nozzles under extreme heat flux. Our technical experts in the United States will be happy to support you in solving extreme heat-flux challenges.
Dow has also developed thermally-conductive gels for encapsulating electronics, and instant green-strength adhesives for bonding substrates with different thermal-expansion rates that could be of help for current and future module designs.
Featured products
Key product list – a preview of DOW’s complete lineup.
Adhesives, sealants, and foams
| Product | Cure system | Features and benefits | Agency listing |
| DOWSIL™ 3-6548 Silicone RTV Foam | Two-part addition | Reversion resistant, non-corrosive foam can be used for preparing fire-resistant penetration seals | ASTM E814 |
| DOWSIL™ 3-6265 HP Adhesive | One-part addition | Non-flowing • High tensile strength • Low void formation after cure for sensitive substrates | UL 94 V-0 |
| DOWSIL™ 6-1104 Controlled Volatility Sealant DOWSIL™ 6-1125 Controlled Volatility Sealant | One-part condensation | Extrudable, non-slump materials • NASA requirements for low outgassing • Easy repairability • Good physical and electrical stability over a range of frequencies, temperatures, and humidity • Ensure protection of components from temperature extremes, high humidity, radiation, thermal shock, atomic oxygen, and mechanical vibration | NASA requirements |
| DOWSIL™ 93-076 RF Aerospace Sealant | Two-part condensation | A high-temperature sealant/adhesive with high bond strength • Can be used as an effective high-temperature pressurization sealant, thermal barrier, or insulative coating, and as an adhesive for ablative coatings • Can be used for protecting cable breakouts and terminations • For fabricating formed-in-place seals | MIS-19888 |
| DOWSIL™ 730 FS Solvent Resistant Sealant | One-part condensation | Fluorosilicone adhesive/sealant • Non-sag acetoxy-cure system • Easy to apply • Good adhesion to many substrates • Stable and flexible from -65°C (-85°F) to 260°C (500°F) • Retains its properties under exposure to fuels, oils, and solvents | |
| DOWSIL™ 732 Multi-Purpose Sealant | One-part condensation | Non-sag acetoxy-cure system • Easy to apply • Good adhesion to many substrates • Flexible from -60°C (-76°F) to 180°C (356°F) with short peaks to 205°C (401°F) | MIL-A-46106 |
| DOWSIL™ 3145 RTV Mil-A-46146 Adhesive/Sealant | One-part condensation | Non-flowing • High tensile strength • Fast in-line cure with optional heat acceleration | MIL-A-46146 |
| DOWSIL™ 7092 High Green Strength Adhesive and Sealant | One-part condensation | Instant green strength • Excellent adhesion to a wide range of substrates such as glass, metal, and plastics | UL 94 HB |
| DOWSIL™ EA-6060 Adhesive | Two-part addition | Fast, low-temperature cure • UV indicator for inspection | UL 94 V-0 |
| DOWSIL™ Q3-1566 Heat Resistant Adhesive/Sealant | One-part condensation | High temperature resistant • Broad adhesion to many substrates |
Coatings, gels, and encapsulants
| Product | Cure system | Features and benefits | Agency listing |
| DOWSIL™ 1-2577 Conformal Coating | One-part condensation | Elastoplastic • Cured to a tough, abrasion resistant surface | UL 94 V-0 • IPC-CC-830A • MIL-I-46058 |
| DOWSIL™ 1-4105 Conformal Coating | One-part addition | Elastomeric • No added solvents • Rapid, versatile-cure processing controlled by temperature | UL 94 V1 (f1) |
| DOWSIL™ 3-1953 Conformal Coating | One-part condensation | Elastomeric • Cured to a soft coating - allowing reliability improvement against stress | UL 746 E • IPC-CC-830B • MIL-I-46058 |
| DOWSIL™ 93-500 Space Grade Encapsulant (Thixotropic) | Two-part addition | Silicone elastomer • Exceeds requirements of NASA for thermal vacuum low outgassing • Wide operating temperature range from -115°C to 200°C (-149°F to 392°F) | NASA SP-R-0022A |
| DOWSIL™ 3140 RTV Coating | One-part condensation | Good flowability • High elongation value for vibration/mechanical shock dampening and low stress | MIL-I-46058C • IPC-CC-830 • UL 94 V1 |
| DOWSIL™ CC-3122 Conformal Coating | One-part condensation | Elastoplastic • High-performance • Solvent-free • Delivers long-term reliability in extreme environmental conditions | UL 94 V-0 |
| SYLGARD™ 160 Silicone Elastomer | Two-part addition | General purpose encapsulant with good flowability and flame resistance • Moderate thermal conductivity • Condensation-cure system that can be heat accelerated | UL 94 V-0 |
| SYLGARD™ 170 Fast Cure Silicone Elastomer | Two-part addition | Low viscosity • General purpose encapsulant | MIL-PRF-23586 |
| SYLGARD™ 527 Silicone Dielectric Gel | Two-part addition | Condensation- or heat-accelerated cure dielectric gel • Suitable for protecting various electronic devices, especially those with delicate components | UL 94 HB |
Optically clear materials
| Product | Cure system | Features and benefits | Agency listing |
| DOWSIL™ EG-1200 Gel | Two-part addition | High transparency • Rapid versatile-cure flowable gel • High tackiness for coupling variety of surfaces • Can be used as liquid optically clear coupling agent for displays and lighting applications | |
| DOWSIL™ MS-1002 Moldable Silicone | Two-part addition | Optically clear moldable silicone • Suitable for producing fine detail optical parts • Good resistance to environmental aging | UL 94 (f1) |
| DOWSIL™ VE-XXXX | UV | Transparent • Low modulus • Low shrinkage • UV-curable resin for liquid-based bonding technology • Designed to bond display cover glass/plastic and touch panel to LCD/OLED display modules | |
| SYLGARD™ 184 Silicone Elastomer | Two-part addition | Transparent, two-part encapsulant • Good flame resistance | UL 94 V1 (f1) |
Liquid silicone rubbers (LSRs)
| Product | Cure system | Features and benefits | Agency listing |
| SILASTIC™ RTV-3120 Mould-Making Base | Two-part condensation | General purpose silicone mold-making rubber • Recommended for high-temperature applications | |
| SILASTIC™ RTV-4130-J Base and Curing Agent | Two-part addition | High durometer silicone rubber • Simplified handling • Room-temperature cure within 24 hours, or heat accelerable | |
| SILASTIC™ RTV-4230-E Base and Curing Agent | Two-part addition | High strength • Tear resistant • Creates flexible molds to reproduce intricate detail • Easy release • High elongation | |
| SILASTIC™ FL 60-9201 Fluoro Liquid Silicone Rubber (F-LSR) | Two-part addition | Solvent resistant • Chemically resistant • For gasketing and membranes |
Electrically- and thermally-conductive materials
| Product | Cure system | Features and benefits | Agency listing |
| DOWSIL™ 1-4173 Thermally Conductive Adhesive | One-part addition | 1.8 W/m·K flowable adhesive • High tensile strength • No added solvent | UL 94 V-0 |
| DOWSIL™ TC-2035 Adhesive | Two-part addition | 3.3 W/m·K heat-cure adhesive • Low bond-line thickness • Stable performance at high temperatures up to 200°C (392°F) | UL 94 V-0 |
| DOWSIL™ EC-6601 Electrically Conductive Adhesive | One-part condensation | Sealant for EMI shielding in a wide range of frequencies • Can be used as an adhesive or formed-in-place gasket • Adheres to variety of substrates • High elongation provides flexibility of joints | |
| DOWSIL™ TC-4515 Thermal Gap Filler | Two-part addition | 1.8 W/m·K condensation- or heat-accelerated cure gap filler • Holds vertical position in cured and uncured state • Soft and compressible once cured | UL 94 V-0 |
| DOWSIL™ TC-4535 CV Thermally Conductive Gap Filler | Two-part addition | 3.5 W/m·K controlled volatility gap filler | UL 94 |
Primers
When surface preparation is required, we recommend starting with one of the following primers.
| Primer | Cure system | Features and benefits |
| DOWSIL™ 1200 OS Primer | One-part condensation | Enhances bonding/adhesion of RTV- and heat-cure silicones to metals, ceramics, glass, wood, masonry, and structural plastics. |
| DOWSIL™ 92-023 Primer | One-part condensation | Specially formulated for use with addition-cure silicones to mitigate surface poisoning. Recommended for use with FR4, most metals, and ceramics. |
| DOWSIL™ 1204 Primer | One-part condensation | Enhance adhesion to most metals, ceramics, and plastic for all silicones, especially with RTV cure. |
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