DOWSIL EA-2626
Harmonization Code : 3506.91.90.99 | Prepared glues and other prepared adhesives, not elsewhere specified or included; products suitable for use as glues or adhesives, put up for retail sale as glues or adhesives, not exceeding a net weight of 1 kg ; Adhesives based on polymers of headings 3901 to 3913 or on rubber; Other ; Other
Main features
- Fast Adhesive Cure
- Non-Sag Placement Control
- Robust Cured Mechanical Properties
Product Description
DOWSIL™ EA-2626 Adhesive is a two-component, room-temperature curing, non self-leveling adhesive. It utilizes a neutral alkoxy cure system and maintains a paste consistency. This adhesive is developed to provide durable adhesive sealing for components which exhibit different thermal expansion rates, or where fast cure requirements make one-part room temperature cure adhesives inappropriate.
Product Key Features
- Two-Component Fast Cure - cures rapidly at room temperature with a fast cure in-depth, unlike typical outside-inward moisture cure adhesives, allowing for rapid handling of bonded components.
- Mix Ratio - designed to be used with SILASTIC™ Q3-3636 Catalyst in a mix ratio of 100 parts base to 13 parts catalyst by weight.
- Non-Sag Rheology - features a non self-leveling, paste consistency that ensures the material remains in place during application.
- Robust Mechanical Profile - cures to deliver a Shore A hardness of 43 to 45, a tensile strength greater than 1.9 MPa, and an elongation at break of more than 200%.
- Environmental & Heat Resistance - offers excellent weathering, U.V., and heat resistance up to 190°C, alongside good resistance to hot and humid conditions.
Applications
This adhesive provides good, durable adhesion to a range of substrates including plastics, metals, and glass, making it highly effective for both automotive and appliance manufacturing[cite: 1742].
- Automotive Lighting - typically used in automotive manufacturing for bonding polycarbonate or glass lenses to the reflector housings of headlamps and fog lamps.
- Appliance Assembly - serves as a perfect solution in appliance manufacturing, especially for oven and ceramic hob assembly, seamlessly bonding glass to metal, painted metal, or plastic.
- Dissimilar Materials - provides durable sealing for components that exhibit different thermal expansion rates.
Technical Specifications
General Properties
ColorColor
A/B: White/ Gray, Special blackSpecific GravitySpecific Gravity
A/B (Gray, Special Black): 1.31/1.00,1.04Work life @25°CWork life @25°C
0.1 hoursMechanical Properties
ElongationElongation
>200 %Additional Information
Two-Component Fast Room Temperature Cure Adhesive
DOWSIL™ EA-2626 Adhesive
DOWSIL™ EA-2626 Adhesive is a two-component, non-self-leveling silicone adhesive system engineered to deliver a fast room-temperature cure in-depth, rather than curing outside-inward like typical moisture-cure adhesives. Utilizing a neutral alkoxy cure system, it consists of DOWSIL™ EA-2626 Base paired with SILASTIC™ Q3-3636 Catalyst (available in Grey or Special Black). This high-performance adhesive is specifically developed to provide durable, elastic structural bonding and sealing for components exhibiting different thermal expansion rates, offering rapid handling capabilities without the need for temporary storage infrastructure.
100:13 mix ratio by weight 6 to 9 min snap time Fast homogeneous depth cure Heat resistance to 190°C
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Typical values only. Performance profiles are measured at standard ambient conditions of 23°C unless otherwise indicated.
DOWSIL™ EA-2626 Adhesive
Key Features
- Two-component room-temperature cure executes a fast, thorough depth cure independent of joint thickness.
- Non-self-leveling thixotropic paste consistency resists running or slumping, remaining under 2 mm of vertical flow.
- Cures smoothly to form a highly resilient, flexible silicone rubber with robust weathering and UV stability.
- Durable, unprimed adhesion profiles build rapidly onto glass, ceramics, metals, and selected automotive plastics.
- High thermal resistance safely withstands exposure conditions continuously up to 190°C.
- Excellent hot and humid aging performance, maintaining joint integrity after 7 days immersion in water at 70°C.
Processing Summary
Mix Proportions: Calibrated for a precise mix ratio of 100 parts base to 13 parts catalyst by weight. Volumetric pump parameters compute to 5.7:1 for the Grey catalyst and 5.9:1 for the Special Black catalyst.
Working & Tack-Free Windows: Exhibits a fast inline working snap time of 6 to 9 minutes at 23°C. The material develops a tack-free surface state within a quick 11 to 18-minute window.
Rapid Handling Turnaround: Deep cross-linking progresses fast at ambient room conditions, enabling bonded parts and assemblies to be transferred or handled within 10 to 120 minutes.
Cure Acceleration: Ambient moisture cures eliminate oven operations, but the cure and adhesion strength build rate can be further quickened by applying moderate heat at 60-70°C for 10 minutes.
Handling and Application Guidance
Process Notes
Storage and Shelf Life
- Store DOWSIL™ EA-2626 Base in unopened original containers at or below 32°C to retain a 12-month shelf life.
- Store SILASTIC™ Q3-3636 Catalysts (Grey and Special Black) in unopened original containers at or below 25°C to realize a 5-month shelf life.
- Keep containers tightly closed to prevent atmospheric moisture from contaminating the materials.
Surface Preparation
- All bonding joint faces must be thoroughly clean, dry, and cleared of dust, dirt, or extraneous matter.
- Degrease boundaries using pure industrial solvents like isopropyl alcohol, acetone, or methyl ethyl ketone (MEK).
- Low surface energy substrates like polypropylene (PP) can achieve excellent hold via localized plasma or flame treatment.
- Avoid using acetone or IPA alone if heavy processing oils are present, as they do not remove oils effectively.
Equipment and Mixing
- Robotic meter/mix/dispense machinery must be fitted with precision gear or piston metering pumps for base and catalyst channels.
- Dispense through an engineered static or dynamic mixing element array to ensure uniform composition.
- Watch the extrusion profile closely; the presence of light-colored streaks or marbling indicates inadequate mixing.
- Automated airless dispense equipment configuration is highly recommended to eliminate or minimize inline de-airing steps.
Typical Properties
Engineering Data for DOWSIL™ EA-2626
Uncured Component Characteristics (As Supplied)
| Property Parameter | EA-2626 Base | Q3-3636 Catalyst Grey | Q3-3636 Catalyst Special Black | Standard / Notes* |
|---|---|---|---|---|
| Appearance / Color | White paste | Grey | Special Black | CTM 0176 |
| Viscosity (mPa·s) | 205,000 | 18,000 - 48,000 | 350,000** (ca.) | ASTM D1084 / Penetration test utilized for Black |
| Specific Gravity | 1.36 | 1.00 | 1.04 | ASTM D1475 |
*Materials were tested according to Dow Corporate Test Methods (CTM), which in most cases are similar to the ASTM (American Society for Testing and Materials)standards listed above
**A penetration test is used to measure consistency of Catalyst Special Black. Value 180–460 mm/10
Mixed & Cured Elastomer Performance Characteristics
| Elastomeric Property Parameter | With Grey Catalyst | With Special Black Catalyst | Test Standard / Condition Basis |
|---|---|---|---|
| Working Time (Snap) | 6 - 9 minutes | 6 - 9 minutes | Measured at 23°C |
| Tack-Free Time | 11 - 18 minutes | 11 - 18 minutes | Measured at 23°C |
| Flow (Slump Resistance) | < 2 mm | < 2 mm | ASTM D1475 |
| Specific Gravity (Cured) | 1.32 | 1.33 | ASTM D1475 |
| Color (RAL Code Equivalent) | 7000 | 7021 | - |
| Durometer Hardness | 43 Shore A | 45 Shore A | Cured 7 days @ 23°C, 2mm sheets (ASTM D2240) |
| Tensile Strength | > 1.9 MPa | > 1.9 MPa | Cured 7 days @ 23°C, 2mm sheets (ASTM D412) |
| Elongation at Break | > 200 % | > 200 % | Cured 7 days @ 23°C, 2mm sheets (ASTM D412) |
Adhesion strength metrics & Lap Shear Performance
Testing Format Dwell Profile: 24 hours cure at 23°C
| Substrate Interface Combo Matrix | Lap Shear Value (Grey / Black) | Cohesive Failure Rate (CF %) |
|---|---|---|
| Clear Polycarbonate (PC) | Verified Bond | 100% / 100% |
| Polycarbonate / Treated Polypropylene (PC/PP*) | > 1.0 MPa / > 1.0 MPa | 100% / 100% (*PP treated with plasma) |
| Polycarbonate / Glass (PC/Glass) | > 1.0 MPa / > 1.0 MPa | 100% / 100% |
| PBT-ASA Plastic Blend / Glass | > 1.0 MPa / > 1.0 MPa | 100% / 100% |
Applications
Where DOWSIL™ EA-2626 Fits
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Automotive Lighting Glazing
Perfectly optimized for vehicular headlamp and fog lamp assembly configurations where standard one-part moisture cure sealants restrict high inline throughput.
- Bonds polycarbonate or glass lenses fluid-tight.
- Mounts lenses strongly onto plastic reflector housings.
- Absorbs severe operational vibration without line hold failure.
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Appliances & Ceramic Hobs
Delivers premium structural bonding seals for modern white goods, domestic ovens, and professional kitchen hobs.
- Secures structural glass elements directly to metals.
- Bonds glass cleanly onto painted metals or plastic frameworks.
- Withstands rigorous daily high-heat exposure profiles.
Dissimilar Material Interfaces
Specially tailored to serve as a durable, stress-relieving sealant between parts demonstrating widely different linear thermal expansion rates.
- Maintains 100% cohesive failure boundaries across variant surfaces.
- Compensates for relative dimensional shifts under thermal flux.
- Non-sag consistency forms uniform seals on vertical runs.
Package & Support
Standard Packaging & Technical Help
Standard Container Sizes
- Available across different standard industrial protective container sizes matching commercial hardware.
- Packaged independently as clean DOWSIL™ EA-2626 Base and high-shear active catalysts.
- Logistics configurations maintain high seal metrics to shield elements from room humidity.
Technical Help Capabilities
- Calibrating custom volumetric mixing ratios from weight guidelines to align pump mechanics.
- Auditing component layout lines to identify and rule out potential chemical addition-cure inhibitors.
- Advising on surface plasma or flame activation methods for difficult substrates like treated Polypropylene.
- Coordinating lab-scale substrate evaluations to establish minimum line cure parameters.
Technical Guidance
Tips and Troubleshooting
| Issue | Recommended Action |
|---|---|
| Light-colored streaks or marble patterning visible in the compound bead |
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| Extended handling wait windows or slowdown in expected cure tracking speeds |
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| Adhesion tracking breakdown or low lap shear metrics on low-energy plastics |
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Next Steps
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