DOWSIL 3-6876
Harmonization Code : 38159000 | Unspecified reaction initiators, accelerators, and catalytic preparations
Main features
- Flowable One-Part Processing
- 300-Minute 100 deg C Cure
- Balanced Cured Mechanical Properties
Product Description
DOWSIL™ 3-6876 Adhesive is a one-part, flowable, addition-cure silicone adhesive for bonding, sealing, and gasketing applications in electronic and automotive assemblies. The black adhesive requires no mixing and can be applied by automated or manual needle dispensing. Its 41,275 mPa·s typical viscosity allows the material to flow, fill, and self-level after dispensing. Cure speed is controlled by temperature, with typical schedules ranging from 300 minutes at 100°C to 30 minutes at 150°C. After cure, the material provides 5.5 MPa tensile strength, 255% elongation, Shore A 53 hardness, and 4.4 MPa unprimed lap-shear adhesion to aluminum. Applications include sealing housings and connectors, attaching baseplates, gasketing, engine and transmission controllers, ABS assemblies, and lighting components.
Key features
- One-part addition-cure silicone: Requires no component mixing and generates no cure by-products.
- Flowable, self-leveling consistency: Typical viscosity of 41,275 mPa·s supports needle dispensing, filling, and leveling after application.
- Temperature-controlled heat cure: Typical cure schedules include 300 minutes at 100°C, 60 minutes at 125°C, and 30 minutes at 150°C.
- Mechanical strength with elongation: Typical cured properties include 5.5 MPa tensile strength and 255% elongation.
- Unprimed adhesion to aluminum: Typical lap-shear strength is 4.4 MPa on the tested aluminum configuration.
- No added solvents: Supplied as a solventless, black silicone adhesive.
Applications / Suitable for
- Sealing lids, housings, and connectors
- Attaching baseplates
- Formed-in-place gasketing
- Engine, transmission, and ABS controllers
- Lighting assemblies
Technical Specifications
General Properties
Mechanical Properties
Additional Information
DOWSIL™ 3-6876 Adhesive
A one-part, black, flowable silicone adhesive that combines temperature-controlled heat curing with high tensile strength and elongation. It requires no mixing and can be dispensed manually or with automated needle equipment for bonding, sealing, filling, and gasketing operations.
DOWSIL™ 3-6876 Adhesive is supplied as a one-part black silicone adhesive.
As-supplied properties
Processing and cure
Thoroughly mix the material before use when filler settling has occurred. Prepare clean, degreased substrates, dispense the adhesive, assemble the parts, and apply a supported heat-cure schedule. Cure rate increases with temperature.
Storage and handling
Store the material in its original, tightly closed container. The reported shelf life is 12 months at 5°C. Cold storage is recommended to extend usable life, and the product label “Use Before” date should be observed. Protect the material from moisture and incompatible cure-inhibiting substances.
| Cure temperature | Typical cure time | Processing context |
|---|---|---|
| 100°C | 300 minutes | Lower-temperature schedule with the longest listed cure time. |
| 125°C | 60 minutes | Intermediate cure schedule. |
| 150°C | 30 minutes | Highest-temperature and shortest listed cure schedule. |
For thick sections or when voiding is observed, a 30-minute pre-cure at 70°C may be evaluated. Cure schedules and adhesion should be confirmed in the actual assembly.
Cured properties
| Property | Typical value | Context |
|---|---|---|
| Specific gravity | 1.311 | Cured material |
| Tensile strength | 5.5 MPa / 795 psi | Typical cured tensile result |
| Elongation | 255% | Typical tensile elongation |
| Tensile modulus | 2.2 MPa / 310 psi | Typical cured tensile modulus |
| Hardness | Shore A 53 | Cured elastomer |
| Unprimed lap shear to aluminum | 4.4 MPa / 640 psi | Specific to the tested aluminum and joint configuration |
| Linear coefficient of thermal expansion | 250 ppm/°C | Measured by thermomechanical analysis |
| General long-term operating range | −45 to 200°C | Application performance must be verified in the actual part and operating conditions |
Values are typical and are not intended as product specifications or design allowables.
Applications
The flowable one-part material can be evaluated for dispensing into bonded and sealed assemblies that can accommodate the required heat-cure process.
Product resources
Review broader silicone adhesive-selection and electronics-application guidance to place DOWSIL™ 3-6876 Adhesive within relevant material and manufacturing contexts.
Advanced Silicone Adhesives and Sealants Guide
Provides broader guidance on silicone adhesive and sealant technologies, processing approaches, performance characteristics, and product-selection considerations.
Open the silicone adhesives and sealants guideMaterial Solutions for Communications and Consumer Applications
Reviews silicone-material roles in communications and consumer electronics, including bonding, sealing, protection, assembly, and thermal-management applications.
Open the communications and consumer applications guideTechnical support for DOWSIL™ 3-6876 Adhesive
Need help matching DOWSIL™ 3-6876 Adhesive to a housing, baseplate, connector, gasket, or controller assembly? Krayden can support material selection, dispensing evaluation, substrate and adhesion testing, and development of a suitable heat-cure process.
