DOWSIL SILASTIC Q3-3636 Adhesive
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
- Two-Component Fast-Cure Silicone
- Flexible Mix-Ratio Processing
- Low-Fogging Silicone Adhesive
Product Description
SILASTIC™ Q3-3636 Adhesive is a two-component, room temperature curing thixotropic adhesive. It has been developed to provide durable adhesive sealing for components that must perform in difficult environments, such as those operating at high temperatures or exhibiting different thermal expansion rates. Featuring a through-cure mechanism, it cures rapidly in-depth rather than from the outside inward, and it is not sensitive to humidity during the curing process.
Product Key Features
- Two-Component Fast Cure - cures rapidly at room temperature to allow for a fast assembly process, and can be further accelerated with moderate heat.
- Low Fogging & Thermal Resistance - offers reduced weight loss (fogging) at high operating temperatures and maintains excellent heat resistance up to 190°C.
- Flexible Mix Ratios - designed for use with Grey or Black catalysts at a 100:13 mix ratio by weight, or with the Special Black catalyst at a 100:14 mix ratio by weight.
- Robust Mechanical Profile - cures to deliver a Shore A hardness of 32 to 35, a tensile strength greater than 1.8 MPa, and an elongation to break exceeding 300%.
- Environmental Durability - exhibits excellent weathering, U.V. resistance, and durable adhesion across a wide variety of substrates even under hot and humid conditions.
Applications
This adhesive is formulated for high-temperature and difficult environments where fast cure requirements make one-part adhesives inappropriate.
- Automotive Lighting: Ideal for bonding polycarbonate or glass lenses to the reflector housings of headlamps and fog lamps.
- Appliance Assembly: Perfect for appliance manufacturing, especially in oven and ceramic hob assemblies, for bonding glass to metal, painted metal, or plastic.
- Dissimilar Materials: Effectively seals components that exhibit differing thermal expansion rates.
TDS, SDS & Technical Documents
Technical Specifications
General Properties
ColorColor
A/B: White/ Gray, black, whiteSpecific GravitySpecific Gravity
A/B (Gray, Black, Special Black): 1.31/1.00,1.02,1.04Work life @25°CWork life @25°C
0.1 hoursMechanical Properties
ElongationElongation
>300 %Additional Information
Two-Component Low-Fogging RTV Silicone Adhesive
SILASTIC™ Q3-3636 Adhesive
SILASTIC™ Q3-3636 Adhesive is a high-performance, two-component, room-temperature curing thixotropic silicone adhesive engineered for high-speed manufacturing environments. Delivering a deep thorough cure rather than an outside-inward moisture mechanism, this system is completely unaffected by shifting factory humidity levels. Formulated with controlled low-fogging technology, it minimizes material weight loss at extreme operating temperatures. This system is highly specialized to provide durable, elastic structural bonds across substrates with widely differing thermal expansion rates, making it an ideal choice for challenging automotive lighting and consumer appliance assemblies.
1:1 mix ratio compatible 2.5 to 10 min snap time Low-fogging volatile control Fast through-cure mechanism
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Typical engineering data metrics only. Curing schedules proceed independently of ambient relative humidity levels.
SILASTIC™ Q3-3636 Adhesive
Key Features
- Two-component thixotropic paste provides a complete through-cure, completely unhindered by humidity limits.
- Low-fogging composition dramatically lowers volatile weight loss inside closed assemblies at high temperatures.
- Non-slump paste consistency tracks neatly, yielding less than 2 mm of vertical flow on joint lines.
- Establishes excellent primerless adhesion to glass, metals, and standard engineering substrates.
- Retains high structural elastomeric hold and continuous thermal stability up to 175°C.
- Maintains high flexibility under severe moisture stress, resisting 6 days water immersion at 60°C.
Processing Summary
Mix Proportions: Calibrated for a precise 100:13 weight ratio with Grey or Black catalysts, and a 100:14 ratio with Special Black catalys. Volumetric tracking scales to 5.9:1 and 5.6:1 respectively.
Snap & Tack Windows: Working snap life runs from 3 to 10 minutes depending on catalyst selection. Surfaces develop a tack-free boundary layer in 5 to 20 minutes under ambient parameters.
Robotic Dispensing: Engineered for high-speed automated tracks using gear or piston metering pumps paired with static mixing assemblies. Dynamic mixing units are currently not recommended.
Cure Acceleration: Reaches full engineering rubber properties within 7 days at room temperature. Cross-linking and adhesion building can be accelerated by applying moderate heat at 50–65°C for 6–10 minutes.
Handling and Application Guidance
Process Notes
Storage and Shelf Life
- Store SILASTIC™ Q3-3636 Base at or below 32°C in unopened containers for a 12-month usable life.
- Store Black, Grey, and Special Black Catalysts at or below 25°C to preserve a 5-month shelf life.
- Keep containers tightly closed to isolate materials from accidental atmospheric moisture contact.
Surface Preparation
- All bonding paths must be thoroughly clean, dry, and free of extraneous matter, dust, or oils.
- Clean substrates with industrial solvents like Dow OS fluids, naphtha, mineral spirits, or MEK.
- Avoid using pure acetone or isopropyl alcohol (IPA) alone, as they do not remove heavy oils well.
- Low-energy plastics like polypropylene can achieve excellent hold via flame or plasma activation.
Material Uniformity
- Conduct a thorough component blend check prior to tracking material beads into assembly lines.
- Watch for marbling trends or light-colored streaks; these indicate inadequate mixing.
- Highly plasticized rubbers can migrate mobile plasticizers that function as release coatings.
- Execute small-scale laboratory evaluations on all substrates before launching wide production trials.
Typical Properties
Engineering Data for SILASTIC™ Q3-3636
Uncured Component Characteristics (As Supplied)
| Property | Q3-3636 Base | Q3-3636 Grey Catalyst | Q3-3636 Black Catalyst | Q3-3636 Special Black Catalyst |
|---|---|---|---|---|
| Appearance | White paste | Grey Paste | Black Paste | Special Black Paste |
| Viscosity (mPa·s) | 200,000 | 18,000 - 48,000 | 55,000 - 135,000 | 350,000 (ca.) |
| Specific Gravity | 1.31 | 1.00 | 1.02 | 1.04 |
Mixed & Cured Performance Properties (Base + Catalyst Blends)
| Elastomeric Property | Grey Catalyst Mix | Black Catalyst Mix | Special Black Catalyst Mix | Test Standard Condition |
|---|---|---|---|---|
| Working Time (Snap) | 3 - 10 minutes | 3 - 10 minutes | 2.5 - 10 minutes | CTM 0092 AA |
| Tack-Free Time | 5 - 18 minutes | 6 - 20 minutes | 5 - 18 minutes | CTM 0095 A |
| Flow (Slump Index) | < 2 mm | < 2 mm | < 2 mm | CTM 0062 |
| Specific Gravity (Mixed) | 1.27 | 1.27 | 1.28 | CTM 0097 B |
| Color RAL Equivalent Code | 7000 | 7016 | 7021 | CTM 0040 A |
| Durometer Hardness | 32 Shore A | 35 Shore A | 35 Shore A | 7 days cure @ 23°C, 2mm sheets |
| Tensile Strength | > 1.8 MPa | > 1.8 MPa | > 1.8 MPa | 7 days cure @ 23°C, 2mm sheets |
| Elongation at Break | > 300 % | > 300 % | > 300 % | 7 days cure @ 23°C, 2mm sheets |
Adhesion Strength Performance Summary
| Substrate Combo Matrix | Grey Catalyst Mix | Black Catalyst Mix | Special Black Catalyst Mix | Test Standard Condition |
|---|---|---|---|---|
| Peel test on Clear Polycarbonate (PC) Cohesive failure |
100% | 100% | 100% | 24 hours at 23°C |
| Lap shear strength on Polycarbonate / Glass (PC/Glass) |
> 0.7 MPa (CF 100%) | > 0.7 MPa (CF 100%) | > 0.7 MPa (CF 100%) | 24 hours at 23°C |
| Lap shear strength on PBT-ASA Plastic Blend / Glass |
> 0.7 MPa (CF 100%) | > 0.7 MPa (CF 100%) | > 0.7 MPa (CF 100%) | 24 hours at 23°C |
Applications
Where SILASTIC™ Q3-3636 Fits
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Automotive Headlamps & Fog Lamps
Perfect for precision vehicle light assembly applications where low volatile outgassing is critical to preserve long-term lens transparency.
- Bonds polycarbonate and glass lens modules strongl.
- Secures parts to plastic reflector housings safely.
- Low-fogging configuration blocks internal component film build.
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Ovens & Ceramic Hobs
An exceptional choice for domestic appliance assembly lines requiring flexible structural hold under high service temperatures.
- Anchors structural glass elements directly to framing metals.
- Bonds window lines cleanly to painted metals or plastic brackets.
- High temperature flexibility survives continuous heat cycles.
Dissimilar Material Interfaces
Tailored to serve as a high-strength mechanical joint buffer between sub-assemblies demonstrating widely different linear thermal expansion rates.
- Achieves 100% cohesive failure boundaries to minimize tearing.
- Compensates for shifting component dimensions during temperature swings.
- Non-sag thixotropic paste rheology forms clean beads on vertical loops.
Package & Support
Standard Packaging & Technical Help
Standard Container Sizes
- Available across different standard industrial container sizes to coordinate with standard line pumps.
- Packaged independently as uniform SILASTIC™ Q3-3636 Base and catalytic cross-linking agents.
- Logistics configurations maintain high seal metrics to shield elements from room moisture contact.
Technical Help Capabilities
- Calibrating automated volumetric mix ratios from weight guidelines to preserve correct pump tracking.
- Auditing manufacturing environments to identify and screen out potential chemical addition-cure inhibitors.
- Advising on surface plasma or flame treatment options for low surface energy parts like Polypropylene.
- Coordinating small-scale laboratory evaluations to establish minimum line cure parameters.
Technical Guidance
Tips and Troubleshooting
| Issue | Recommended Action |
|---|---|
| Light-colored streaks or distinct marbling 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 force values over difficult substrates |
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Next Steps
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