DOWSIL™ EA-4700 CV Adhesive

Harmonization Code : 3910.00.00.90 |   Silicones in Primary Forms; Others
Main features
  • Two-part system
  • Fast curing options
  • Controlled volatility

Product Description

DOWSIL™ EA-4700 CV Adhesive is a two-part, fast room temperature cure adhesive designed for critical adhesive and sealing performance. It features controlled silicone volatility and maintains high temperature stability after curing. With a dispensable formulation for easy application using standard equipment, it provides good sealing against environmental conditions.

Product Key Features

  • Two-Part System - features a 1:1 mix ratio by weight or volume, making it easy to dispense and mix.
  • Fast Curing Options - offers a fast cure at room temperature, reaching hardness completion in 2 hours at 25°C, or can be heat-accelerated for faster processing.
  • Controlled Volatility - maintains a low volatile siloxane content (D4-D10) of 130 ppm.
  • Robust Mechanical Profile - cures to deliver a JIS Type A hardness of 19, a tensile strength of 3.7 MPa, and an impressive elongation of 630%.
  • Environmental Stability - delivers stable performance under typical operational environments, including exposure to 150°C, thermal shock, and 85°C/85% relative humidity.

Applications

This adhesive fits a variety of automotive applications requiring durable adhesion to typical substrates used in automotive electronics, such as aluminum, PBT, and PPS.

  • Automotive Electronics: Ideal for electronics control units, sensor modules, and battery pack applications.
  • Component Assembly: Used effectively for lid sealing, base plate attaching, and connector sealing where reliable adhesion is necessary.
  • Gasketing: Provides reliable gasketing with durable sealing against the environment.
Product Family
DS-EA4700  
660Ml Kit
White/Black

Catalog Product

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Packaging
TDS, SDS & Technical documents

Technical Specifications

General Properties
Color
Color
The color
 White/ Black
Density
Density
Volumetric mass per unit
 1.16 kg/m3
Physical Properties
Thixotropic index
Thixotropic index
Thixotropic Index is a ratio of a material s viscosity at two different speeds in Ambient temperature, generally different by a factor of ten.

A thixotropic material s viscosity will decrease as agitation or pressure is increased. It indicates the capability of a material to hold its shape. Mayonnaise is a great example of this. It holds its shape very well, but when a shear stress is applied, the material easily spreads.

It helps in choosing a material in accordance to the application, dispense method and viscosity of a material.
 3.8
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
 27,000 mPa.s
Mechanical Properties
Tensile Strength
Tensile Strength
Tensile Strength
Tensile strength determines the resistance of a material to break under tension and it measures how much elongating load (or tensile stress) it can handle before fracture.

To make it simple, it measures how much force we have to apply when pulling apart a material before it breaks.
 3.7 MPa
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.
 630 %
Tensile Modulus
Tensile Modulus @25°C 0.34 N/mm2
Hardness
Durometer (Shore A) 19
Shear strength
Shear Strength 1.2 N/mm2
Electrical Properties
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
Volume Resistivity
Volume Resistivity
Volume resistivity, also called volume resistance, bulk resistance or bulk resistivity is a thickness dependent measurement of the resistivity of a material perpendicular to the plane of the surface.
 1.5E+15 Ohms⋅cm
Dielectric Constant
Dielectric Constant @ 25 ˚C/100 kHz 3.2
Dissipation Factor
Dissipation Factor @ 25°C /100 kHz 0.0018

Additional Information

Two-Part Fast Room Temperature Cure 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.

1:1 mix ratio by volume/weight 20 min working time Controlled volatility (130 ppm) Fast 2-hour ambient cure
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Typical engineering values only. Adhesion builds reliably after hardness completion; cure parameters can be accelerated through targeted heating lines.

DOWSIL EA-4700 CV Adhesive product package
DOWSIL™ EA-4700 CV Adhesive

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

Dispensing Rheology: Engineered with a mixed thixotropic index of 3.8 and a mixed viscosity of 27 Pa·s for smooth tracking through standard automatic dispensing equipment.
Working Life: Provides an active open working time of 20 minutes at 25°C, tracking the duration required for mixed fluid viscosity to double. Avoid marbling streaks, which denote inadequate mixing.
Fast Curing Cycles: Achieves basic hardness completion in 2 hours at 25°C, reaching ultimate elastomeric mechanics within 3 days. Cure tracking can be accelerated with moderate heat up to 80°C.
Operational Stability: Designed to remain fully functional across an extensive in-service baseline range from -45°C up to 150°C, with flexible performance under thermal cycling down to -55°C.
Handling and Application Guidance

Process Notes 

Storage and Material Handling
  • 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.
Surface Preparation
  • 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.
Cure Inhibition Avoidance
  • 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.
Mixing & Vacuum De-Airing
  • 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.
Typical Properties

Engineering Data for DOWSIL™ EA-4700 CV

Uncured Physical & Dispensing Properties

Property Parameter Part A Value Part B Value Mixed   Test Condition
Appearance / Color White paste Black paste Gray non-slump paste  CTM 0176 B
Viscosity at 10 s⁻¹ 24 Pa·s 18 Pa·s 27 Pa·s  Mixed viscosity / CTM 1094 R
Thixotropic Index — 3.8  Ratio 1 s⁻¹ / 10 s⁻¹ mixed / CTM 1094 R
Working Time @ 25°C — 20 minutes CTM 1094 R
Cured Density at 25°C — 1.16 g/cm³ CTM 0022 B

Cured Electrical & Mechanical Characteristics

Physical parameters evaluated following an ambient room temperature cure profile of 3 days at 23°C / 25°C.

Mechanical or Electrical Property Typical Engineering Value Test Method Standard Basis
Durometer Hardness 19 JIS Type A / CTM 0099 M
Tensile Strength 3.7 MPa CTM 0137AAH
Elongation 630 % CTM 0137ABH
Dielectric Strength 25 kV/mm JIS K 6249
Volume Resistivity (Non-Dried) 1.5E+15 ohm·cm JIS K 6249
Dielectric Constant / Dissipation Factor 3.2 / 1.8E-03 1 MHz / JIS K 6249
UL Flammability Classification 94-HB Underwriters Laboratories standard safety rating

Unprimed Adhesion Lap Shear Strength (JIS K 6249)

Substrate Base Material Cure Profile Schedule Lap Shear Value Failure Mode Result
Aluminum (Anodized A5052P) 2 hours @ 25°C 1.2 MPa Early tracking build
8 hours @ 25°C 2.2 MPa Cohesive Failure (100% CF)
24 hours @ 25°C 3.1 MPa Cohesive Failure (100% CF)
72 hours @ 25°C 3.9 MPa Cohesive Failure (100% CF)
5 minutes @ 80°C 1.3 MPa Cohesive Failure (100% CF)
PBT Plastic (Unfilled) 2 hours @ 25°C 1.8 MPa Early tracking build
8 hours @ 25°C 2.0 MPa Cohesive Failure (100% CF)
24 hours @ 25°C 2.1 MPa Cohesive Failure (100% CF)
72 hours @ 25°C 2.7 MPa Cohesive Failure (100% CF)
5 minutes @ 80°C 1.5 MPa Cohesive Failure (100% CF)
Applications

Where DOWSIL™ EA-4700 CV Fits

Automotive electronic module housing assembly
Electronic Control Units & Lids
Specifically formulated to execute rapid, primerless sealing and mechanical bonding for automotive electronic boxes and complex enclosures.
  • Durable lid sealing and base plate attaching.
  • Forms a tough, flexible, fluid-tight gasketing layer.
  • Maintains high environmental protection on Aluminum and PBT plastic.
Electric vehicle battery pack sealing loop
Battery Packs & Sensor Modules
Perfectly configured for high-throughput automotive cleanrooms requiring swift room temperature handling or short-cycle thermal bakes.
  • Reliable structural gasketing for heavy EV battery packs.
  • Critical sealing performance across electronic sensor modules.
  • Withstands severe continuous vibration and thermal shock cycles.
Connector Sealing & Confinement
Utilizes low-outgassing addition-cure chemistry to seal multi-pin electronic terminal networks safely without corrosion risks.
  • Seals wires and terminals inside fully confined configurations.
  • Controlled siloxanes limit outgassing to protect contact points.
  • 630% ultimate elongation absorbs joint stresses under CTE mismatch.
Package & Support

Standard Packaging & Technical Help

Standard Container Sizes
  • 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.
Technical Help Capabilities
  • 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.
Technical Guidance

Tips and Troubleshooting

Issue Recommended Action
Light-colored streaks or marble patterning visible in the compound bead
  • This pattern denotes inadequate or non-homogeneous product mixing across components.
  • Ensure Part A and Part B lines are thoroughly blended at a strict 1:1 volume or weight ratio.
  • Utilize an engineered static mixer nozzle inside manual or automated dispense systems.
  • Although formulation minimizes settling, thoroughly stir individual stock if stored for several months.
Adhesive fails to cross-link properly, remaining liquid or tacky at the boundary
  • The addition-cure catalyst reaction is experiencing chemical inhibition from contact contaminants.
  • Isolate lines from organotin/organometallic compounds and tin-catalyzed silicone rubbers.
  • Completely avoid trace contact with sulfur, polysulfides, polysulfones, and flux residues.
  • Screen substrate parts for highly plasticized plastics or rubbers; mobile plasticizers act as release agents.
  • Run small-scale compatibility tests to confirm alternative substrate component safety.
Occurrence of macro-voids or bubble clusters within cured joint channels
  • Thick structural sections can encapsulate air or vapor pockets during accelerated heat cures.
  • Utilize automated airless dispensing hardware arrays to reduce or completely bypass degassing steps.
  • If de-airing is mandatory, process raw paste at >203 mm Hg vacuum for 10 minutes or until bubbling stops.
  • Assemble parts swiftly following extrusion before the 20-minute working time limit elapses.
Next Steps

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