DOWSIL™ EA-4700 CV Adhesive

DOWSIL™ EA-4700 CV Adhesive

DOWSIL™ EA-4700 CV Adhesive is a high-performance, two-part silicone structural adhesive engineered to deliver exceptionally fast room temperature curing or rapid heat-accelerated bonding. Formulated with an advanced addition-cure mechanism, it cross-links uniformly through deep sections or complete component confinement without releasing volatile by-products. This adhesive features controlled silicone volatility with reduced volatile siloxane content (D4-D10) and is highly specialized to provide a durable, fluid-tight environmental seal. Its robust, tough matrix offers excellent stress relief and reliable performance for sensitive automotive electronics exposed to extreme high-temperature stability up to 150°C, severe thermal shock, and high humidity aging environments.

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Typical engineering values only. Adhesion builds reliably after hardness completion; cure parameters can be accelerated through targeted heating lines.

Key Features

• Two-part thixotropic paste offers a symmetrical 1:1 mix ratio by volume or weight for easy processing.
• Addition-cure chemistry yields zero volatile cross-linking by-products, preventing shrinkage stress.
• Enables rapid deep-section solidification and uniform curing through totally confined substrate pockets.
• Controlled silicone volatility limits volatile siloxane outgassing (D4-D10) to 130 ppm to shield electronics.
• Maintains high environmental sealing stability continuously at 150°C, thermal shock, and 85°C / 85% RH.
• Establishes excellent unprimed primerless adhesion to typical plastics and metals used in automotive assemblies.

Processing Summary

• Realizes a 12-month shelf life from production date when held in cold storage below 30°C.
• Keep containers tightly closed in original packaging to completely block moisture and contamination.
• Formulated to prevent heavy settling, but stir thoroughly if stored for several months.
• Always verify expiration dates and specific storage instructions listed on the batch labels.

• Clean substrate surfaces using Dow OS fluids, naphtha, mineral spirits, or methyl ethyl ketone (MEK).
• Do not rely on acetone or isopropyl alcohol (IPA) alone, as they fail to adequately clear manufacturing oils.
• Introduce fine mechanical abrasion to maximize active bonding contact surface area.
• Use plasma exposure or chemical etching to establish a reactive face on Teflon, PE, or PP lines.

• Avoid contact with organotin catalysts, tin-catalyzed silicone rubbers, and sulfur-containing materials.
• Prevent exposure to polysulfides, polysulfones, unsaturated hydrocarbon plasticizers, or solder flux residues.
• Tacky or liquid product remaining at the joint boundary layer indicates active chemical cure inhibition.
• Run lab-scale compatibility evaluations to confirm component material compliance before line setups.

• Utilize an engineered static mixer nozzle for manual cart or automated meter/mix dispense setups.
• Automated airless dispense equipment is ideal to minimize or bypass separate vacuum de-airing cycles.
• If de-airing is needed to eliminate joint voids, apply a vacuum profile of >203 mm Hg for 10 minutes.
• Mate substrate assemblies quickly after extrusion within the specified 20-minute working window.

• Available as matching Part A (White) and Part B (Black) component kit pairs.
• Supplied across multiple standard industrial protective packaging sizes.
• Containers must be kept tightly closed and stored in cold storage at all times.
• Please contact Dow or your local distributor to confirm specific packet net weights.

• Configuring targeted heat profiles to enable fast 5-minute production bonding lines.
• Auditing shop floor environments to prevent addition-cure catalyst inhibition risks.
• Calibrating dual-fluid pump variables to ensure exact 1:1 mixing by weight or volume.
• Assisting with lab-scale substrate qualification trials to verify cohesive fail limits.

Tell us about your performance, design, and manufacturing challenges. Share your spec automotive substrate materials, planned cycle line speeds, and fluid dispensing equipment parameters. Our global technical networks are prepared to put our silicon-based materials experience and processing knowledge to work for your factory floor.