DOWSIL™ EI-2888 Primerless Silicone Encapsulant

dge blog_Dowsil EI-2888

Table of Contents

Lighting Market and its Challenges

Stick to the Clear Advantage.


Growth and Impact on the Planet

Global LED lighting market to reach $100B in the upcoming decade. This corresponds to 12%+ CAGR in value and 20%+ CAGR in volume

Lighting related energy consumption is expected to drop by 40% in 2030, thanks to LED penetration into general illumination.

Global LED Lighting Market_DGE


Addressing the Needs of Professional Lighting Market

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

Main growth drivers are linked to the expectations of:

  • High efficiency
  • Reliability and robustness
  • High brightness
  • Condensed size and customized shapes
  • Low power consumption


The Need for High Ingress Protection

  • Flexible and Rigid LED Strips
  • Outdoor LED Displays
  • Explosion Proof Lighting
    • Linear: Tube and string/strip
    • Spot, flood and general-area
    • Small portable-type: Flashlights, wearable headlamp
    • Specialty and panel


Protective Materials Over LEDs

Protection options

Conformal Coating

  • Minimally effects luminous flux and CCT
    • Challenge: Provides the least amount of protection above bare components

Optical Encapsulant

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

Molded Lens

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

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


Protection and performance

DOWSIL™ EI-2888 Encapsulant versus other solutions.

DOWSIL™ EI-2888 Encapsulant versus other solutions



Optical influence

Optical influence_dow_DGE

Protective material can:

  • Change Fresnel reflection
  • Change color converted light
  • Change total internal reflection


Optical influence_dow



Existing Encapsulation Materials

Existing Encapsulation Materials

Existing Encapsulation Materials2



Innovate with DOWSIL™ EI-2888 Primerless Silicone Encapsulant

DOWSILTM EI-2888 Primerless Silicone Encapsulant


Innovative Technology from Dow

  • Patented technology
  • 100% silicone product

DOWSIL™ EI-2888 Primerless Silicone Encapsulant

DOWSIL™ EI-2888 Primerless Silicone Encapsulant


Self Adhesive

Reliable adhesion on:

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


Even after 2000 hours exposed to:

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

Limitation: PMMA, die-cast aluminum

Self Adhesive Dowsil EI2888


Optically Clear Under Harsh Environment

Optically Clear Under Harsh Environment_Dowsil EI-2888


Optically Stable Beyond Visible Range and Under Aging

Optically Stable Beyond Visible Range and Under Aging_Dowsil EI-2888


Proven Results

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

high-power LED modules using DOWSIL™ EI-2888 Encapsulant


Cure Robustness

  • Not subjected to cure poisoning
    • Common issue with silicone-based encapsulants
  • Not sensitive to moisture during cure ≠ urethane
    • No need for control atmosphere
  • Lower cleaning requirement

Potential cost saving

Cure Robustness DOWSIL™ EI-2888


Ease of De-gassing

Ease of De-gassing_Dowsil EI-2888

  • Suitable with various mixing techniques, such as hand stirring,
    static mixing, dynamic mixing, and by centrifuge
  • No need for vacuum after application

Low viscosity

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

1:1 Mix ratio


Flexible and Robust

Flexible and Robust 3_DOWSIL™ EI-2888.png

Flexible and Robust DOWSIL™ EI-2888


Cure Time / Hardness to Design Your Process

Cure Time - Hardness to Design Your Process_EI-2888_Dowsil

Stable Under Aging

Stable Under Aging_EI-2888 Dowsil


Good Dielectrical Properties

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

Good dielectrical properties_EI-2888 Dowsil


Long Usable Life

  • One-year stability expected
  • Keep packaging closed − avoid moisture
  • Moisture contamination will decrease cure speed

Long Usable Life_EI-2888 Dowsil


Additional Unique Feature

Additional unique feature_Dowsil EI-2888


Final Comparison / Recap

Final comparison EI-2888_Dowsil


Price Positioning

Price Positioning_Dowsil EI-2888




  • 400 ml side-by-side CRT
  • Material number:
    • 400 ml A/B kit: 99124556

Packaging sample_EI-2888_Dowsil



  • 2 x 19 kg Jerry can
  • 2 x 200 kg drum
  • Material number:
    • 19kg: 99120811 (Part A) 99117550 (Part B)
    • 200kg: 99120810 (Part A) 99117489 (Part B)

Packaging standard_EI2888_Dowsil


Technical and Safety Data Sheets Available

Technical and safety data sheets_EI-2888 Dowsil


We are your technical partner.

If you have any questions or want to find out more about the possibilities for your industrial application, please complete the contact form and one of our experts will be in touch.

If you have a problem with industrial adhesives, sealants, lubricants or electronic protection products and require advice, you can contact our technical support service. Our team can help you to optimize your processes and applications.

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