DOWSIL™ EI-2888 Primerless silicone encapsulant

DOWSIL™ EI-2888 – The lighting market and its challenges

Stick to the clear benefit.

Growth and impact on the planet

The global LED lighting market is expected to reach $100 billion over the next decade. This corresponds to a compound annual growth rate of over 12% in value and over 20% in volume.

Lighting-related energy consumption is expected to decline by 40% by 2030, driven by LED penetration in general lighting.

Meeting the needs of the professional lighting market

The professional LED lighting market is expected to exceed $35 billion by 2022. This includes industrial, commercial, outdoor and architectural applications.

The key growth drivers are related to expectations of:

  • High efficiency
  • Reliability and robustness
  • High brightness
  • Compact size and custom shapes
  • Low energy consumption

The need for a high level of protection against intrusion

  • Flexible and Rigid LED Strip Lights
  • Outdoor LED Displays
  • Explosion proof lighting
    • Linear: Tube and Cord/Tape
    • Spot, flood and general area
    • Small portable type: Flashlights, portable headlamps
    • Specialty and Panel

Protective materials on LEDs

Protection options

Conformal coatings

  • Minimal effects on luminous flux and CCT
    • Challenge: Provide as little protection as possible over bare components.

Optical encapsulant

  • Provides the highest degree of protection and ease of use
    • Challenge: Impact on the CCRS

Molded lens

  • Better optical management
    • Challenge: Lower degree of protection (air gap) and more complex impact price

Encapsulation is best suited for harsh environments, such as explosion-proof or high IP-rated fixtures.

Protection and performance

DOWSIL™ EI-2888 encapsulant compared to other solutions.

Watch a video to see the benefits of DOWSIL™ EI-2888 Primerless Silicone Encapsulant

Optical influence
The protective material can :

  • change the Fresnel reflection
  • change the color of the converted light
  • change the total internal reflection

Existing encapsulation materials

Innovate with DOWSIL™ EI-2888 primerless silicone encapsulant.

Innovative technology from Dow

  • Patented technology
  • 100% silicone product


Reliable membership on :

  • Anodized aluminum
  • Glass
  • FR4
  • Stainless steel
  • Steel
  • Polycarbonate
  • PBT
  • Copper

Even after 2000 hours of exposure to :

  • 150ºC
  • 85ºC / 85% RH
  • -40 / +150ºC thermal shock
  • Sunlight UV

Limitation: PMMA, die-cast aluminum

Optically clear in a difficult environment

Optically stable beyond the visible range and under the effect of aging

Proven results

Two rigid, high power LED modules using DOWSIL™ EI-2888 encapsulant.

Resistance of the polymerization

  • Not subject to inhibition during curing
    • Common problem with silicone-based encapsulants
  • Insensitive to moisture during cure ≠ urethane
    • No need for controlled atmosphere
  • Reduced need for cleaning

Potential cost reduction

Ease of degassing

  • Suitable for various mixing techniques, such as hand mixing, static mixing, dynamic mixing and centrifuging.
  • No need for vacuum after application

Low viscosity

Part A 2,000 mPa.s
Part B 2,300 mPa.s
Mélange 2,700 mPa.s

Mix Ratio = 1:1

Flexibility and robustness

Curing time / Hardness to define your process

Stable with age

Good dielectric properties

Properties Values
Dielectric strength 19kV/mm
Volume resistivity 1E+16 Ω.cm
Surface resistivity 2,6E+14 Ω 

Long service life

  • Expected stability of one year
  • Keep package closed – avoid moisture
  • Moisture contamination reduces cure rate

Additional unique feature

Final Comparison / Wrap-up

Price positioning

More info :

Would you like more information on DOWSIL™ EI-2888 Encapsulant silicone primerless or the entire Dowsil product line ? Contact our technical service by  phone at 04 26 680 680 or fill out our contact form.

Download our documentation dedicated to electronic protection:  

Go further

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Less than a week before the opening of JEC, Samaro is ready to welcome you at booth Hall 6 C49!
Samaro, Hall 6, booth C49, is participating in JEC World 2024, from March 5th to 7th at the Paris Nord Villepinte Exhibition Center.