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- DOWSIL™ Q1-9226 Thermally Conductive Adhesive
DOWSIL™ Q1-9226 Thermally Conductive Adhesive
Harmonization Code : 3910.00.00.90 | Silicones in Primary Forms; Others
Main features
- Two-part system
- Accelerated heat cure
- Robust mechanical & electrical profile
Product Description
DOWSIL™ Q1-9226 Thermally Conductive Adhesive is a two-part, semi-flowable thermally conductive silicone adhesive. It utilizes an accelerated heat cure system that produces no by-products, making it suitable for deep section and confined cures]. With a 1:1 mix ratio and a long pot life, it provides ease of use alongside reliable, self-priming adhesion to a variety of common substrates.
Product Key Features
- Two-Part System - offers an easy-to-use 1 to 1 mix ratio by weight or volume to simplify the preparation process.
- Accelerated Heat Cure - designed to be cured at 100°C (212°F) or above, with cure rates that rapidly accelerate under heat.
- Thermal Management - acts as a thermal bridge with a thermal conductivity of 0.8 W/mK to efficiently transfer heat away from devices to heat sinks.
- Robust Mechanical & Electrical Profile - cures to deliver a Shore A hardness of 67, a tensile strength of 4.15 MPa (600 psi), 124% elongation, and a dielectric strength of 25 kV/mm.
- Deep Section Cure Capability - addition-curing materials contain all ingredients needed for cure with no by-products, allowing for even curing in completely confined or deep sections.
Applications
This adhesive is designed for applications where thermal management and efficient heat transfer from a device to the ambient environment are primary concerns.
- Automotive Control Modules: Typically used for bonding organic and ceramic substrates to heat sinks in automotive applications.
- PCB System Assemblies: Ideal for the thermal management of printed circuit board system assemblies, helping to ensure cooler, more efficient operation and improved reliability.
- Broad Substrate Bonding: Develops good, primerless adhesion to a variety of common substrates including metals, ceramics, epoxy laminate boards, reactive materials, and filled plastics.
Technical Specifications
| General Properties | |||||
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Specific Gravity
Specific Gravity
Specific gravity (SG) is the ratio of the density of a substance to the density of a reference substance; equivalently, it is the ratio of the mass of a substance to the mass of a reference substance for the same given volume. For liquids, the reference substance is almost always water (1), while for gases, it is air (1.18) at room temperature. Specific gravity is unitless. |
2.14 | ||||
| Physical Properties | |||||
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Viscosity
Viscosity
Viscosity is a measurement of a fluid’s resistance to flow. Viscosity is commonly measured in centiPoise (cP). One cP is defined as the viscosity of water and all other viscosities are derived from this base. MPa is another common unit with a 1:1 conversion to cP. A product like honey would have a much higher viscosity -around 10,000 cPs- compared to water. As a result, honey would flow much slower out of a tipped glass than water would. The viscosity of a material can be decreased with an increase in temperature in order to better suit an application |
59,000 mPa.s | ||||
| Mechanical Properties | |||||
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Elongation
Elongation
Elongation is the process of lengthening something. It is a percentage that measures the initial, unstressed, length compared to the length of the material right before it breaks. It is commonly referred to as Ultimate Elongation or Tensile Elongation at break. |
124 % | ||||
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| Electrical Properties | |||||
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Dielectric Strength
Dielectric Strength
Dielectric strength is measured in kV per mm and is calculated by the Breakdown voltage divided by the thickness of the tested material. Those two properties go hand in hand and while Breakdown voltage is always thickness dependent, dielectric strength is a general material property. As an example, the dielectric strength of Polyimide is 236 kV/mm. If we place 1mm of Polyimide between two electrodes, it will act as an insulator until the voltage between the electrodes reaches 236 kV. At this point it will start acting as a good conductor, causing sparks, potential punctures and current flow. |
25 kV/mm | ||||
| Thermal Properties | |||||
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Thermal Conductivity
Thermal Conductivity
Thermal conductivity describes the ability of a material to conduct heat. It is required by power packages in order to dissipate heat and maintain stable electrical performance. Thermal conductivity units are [W/(m K)] in the SI system and [Btu/(hr ft °F)] in the Imperial system. |
0.8 W/m.K | ||||
Additional Information
Two-Part Semi-Flowable Thermally Conductive Silicone
DOWSIL™ Q1-9226 Thermally Conductive Adhesive
DOWSIL™ Q1-9226 Thermally Conductive Adhesive is a two-part, semi-flowable silicone adhesive system formulated to act as an efficient thermal bridge for sensitive electronic assemblies. Delivering a balanced thermal conductivity of 0.8 W/mK, this addition-cure system cross-links under heat without generating volatile by-products, making it perfectly suited for deep sections or complete component confinement. It provides a long pot life for optimal manufacturing flexibility and establishes robust, self-priming structural adhesion to dissipate heat and maximize the reliability of compact device modules.
1:1 mix ratio by volume Accelerated heat cure 0.8 W/mK thermal conductivity Self-priming structural bond
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Typical engineering values only. Cure rates are accelerated by elevated temperatures; processing times depend on section thickness.
DOWSIL™ Q1-9226 Adhesive
Key Features
- Two-part addition-cure silicone system generates no chemical by-products, ensuring void-free deep section cure.
- Optimized thermal conductivity (0.8 W/mK) forms a reliable path to drain operational heat away from substrates.
- Self-priming adhesion builds robust unprimed mechanical lock to metals, ceramics, laminates, and plastics.
- Long compound pot life minimizes inline production material waste and maximizes dispensing process windows.
- Maintains structural elastomer properties and dependable dielectric strength across a -45°C to 200°C footprint.
- Enables low thermal resistance and ultra-thin Bond Line Thicknesses (BLTs) to optimize thermal path management.
Processing Summary
Mix Proportions: Calibrated for a user-friendly 1:1 mix ratio by weight or volume. Thorough blending is essential; avoid light-colored streaks or marble patterns in the paste bead.
Cure Parameters: Requires elevated temperatures of 100°C or higher to cross-link. The cure speed accelerates rapidly as temperature scales upward to help optimize cycle takt times.
Thick Section Baking: For deep sections or confined setups, implement a 30-minute pre-cure thermal bake at 70°C (158°F) as a baseline starting point to eliminate entrapped air voids.
Pot Life Mechanics: Cross-linking reaction initializes immediately upon mixing. The pot life tracks as the duration required for the initial mixed viscosity (59 Pa-sec) to double.
Handling and Application Guidance
Process Notes
Storage and Material Handling
- Retain inside original protective packaging with covers tightly attached to block contaminants.
- Thermally conductive fillers can exhibit gradual settling over several weeks of storage.
- Thoroughly mix each component separately prior to combining to ensure a uniform compound blend.
- Verify expiration dates tracked on the batch container label before assembly setup.
Surface Preparation
- Clean joint faces with Dow OS fluids, naphtha, mineral spirits, or methyl ethyl ketone (MEK).
- Do not use acetone or isopropyl alcohol (IPA) alone, as they do not remove heavy oils well.
- Incorporate fine surface mechanical abrasion to expand active bonding area.
- Apply specialized thin coatings of Dow primers to maximize activity on non-reactive plastic boundaries.
Equipment and Mixing
- Configured to process smoothly across manual tracks or automated meter/mix dispense stations.
- Automated airless dispense machinery can minimize or completely eliminate degassing cycles.
- If degassing is required, process mixed paste at >28 inches Hg for 10 minutes or until bubbling stops.
- Screen highly plasticized substrates; mobile plasticizers can act as release agents and impair hold.
Typical Properties
Engineering Data for DOWSIL™ Q1-9226
Uncured Physical Properties (As Supplied)
| Physical Property | Part A Value | Part B Value | Mixed Value |
|---|---|---|---|
| Appearance / Color | Gray viscous compound | ||
| Viscosity (cP / mPa-sec) | 48,000 | 43,000 | 59,000 |
| Viscosity (Pa-sec) | 48 | 43 | 59 |
Cured Mechanical & Thermal Properties
| Cured Attribute | Typical Value | Unit / Standard Metric |
|---|---|---|
| Thermal Conductivity (hot disk) | 0.8 (0.46) | W/mK (btu/hr-ft-°F) |
| Specific Gravity (Cured) | 2.14 | - |
| Hardness | 67 | Shore A durometer |
| Tensile Strength | 600 (4.15 / 42) | psi (MPa / kg/cm²) |
| Elongation | 124 | % |
| Unprimed Adhesion (Lap Shear to Al) | 375 (2.6 / 260) | psi (MPa / N/cm²) |
| Dielectric Strength | 630 (25) | volts/mil (kV/mm) |
Adhesion Fail Mode Standard: To ensure maximum structural bond strength, achieving 100 percent cohesive failure of the elastomer during lap shear or related physical strength testing is required to verify substrate and device compatibility.
Applications
Where DOWSIL™ Q1-9226 Fits
Automotive Control Modules
Specifically engineered to bond substrate component arrays to heat sinks, establishing a high-performance heat dissipation bridge.
- Bonds organic and ceramic substrate designs.
- Fixes boards securely to dedicated metallic heat sinks.
- Addition-cure chemistry resists continuous operation stress.
Compact Consumer Devices
Addresses thermal management requirements in small, compact product architectures where high heat densities are continuously generated.
- Low thermal resistance protects sensitive IC blocks.
- Forms uniform heat transfer lines to optimize device safety.
- Allows for cooler operation and improved device reliability.
Deep Section Confinement
Formulated for deep joints or fully confined spaces where traditional moisture-curing adhesives cannot solidify.
- Cure parameters advance uniformly throughout the volume.
- Generates absolutely no chemical cure by-products.
- Semi-flowable paste rheology supports flat or grooved application.
Product Demo
See Two-Part Thermally Conductive Silicone Dispensing Methods
Observe the high-precision processing of two-part thermally conductive silicone compounds via automated meter, mix, and dispense stations. This practical reference outlines ideal volumetric ratio tracking, static nozzle configuration, bubble elimination techniques, and clean thixotropic paste placement.
Package & Support
Standard Packaging & Technical Help
Standard Container Sizes
- Packaged as distinct matching Part A and Part B component kit configurations.
- Supplied ready-to-use in standard industrial protective vessel classes.
- Containers must be stored with covers tightly attached to avoid moisture or fluid contamination.
- Manage warehouse tracking using expiry limits listed clearly on the product batch labels.
Technical Help Capabilities
- Fine-tuning baking oven schedules to achieve efficient cross-linking times on your line.
- Auditing component surfaces to rule out addition-cure catalyst inhibition parameters.
- Advising on vacuum de-airing metrics to minimize micro-voids in deep potting profiles.
- Coordinating lab-scale substrate evaluations to ensure 100% cohesive failure performance.
Technical Guidance
Tips and Troubleshooting
| Issue | Recommended Action |
|---|---|
| Light-colored streaks or distinct marbling visible across the mixed bead profile |
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| Occurrence of micro-voids or bubble clusters within cured deep sections |
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| Adhesion tracking breakdown or low lap shear metrics on difficult substrates |
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Next Steps
Ready to Qualify DOWSIL™ Q1-9226?
Share your thermal performance targets, module geometry designs, and manufacturing throughput constraints with us. Tell us about your specified substrate materials, planned heating limits, and fluid delivery hardware. Our application engineers are prepared to assist your team with processing trials to confirm reliable mechanical results on your floor.