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Dow DOWSIL EI-2888 Primerless Silicone Encapsulant Part B Clear 19 kg Pail - EI-2888 PRIMERLESS ENCAP B 19KG PAIL
$1,319.67
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Dow DOWSIL EI-2888 Primerless Silicone Encapsulant Part A Clear 19 kg Pail - EI-2888 PRIMERLESS ENCAP A 19KG PAIL

$1,319.67
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SKU: EI-2888 PRIMERLESS ENCAP A 19KG PAIL
California prop 65
Description
  • Primerless LED protection. Dow DOWSIL EI-2888 Primerless Silicone Encapsulant Clear is a two-component, low-viscosity, self-priming silicone encapsulant. It is designed for explosion-proof and high ingress-protection-rated luminaires and for encapsulating flexible and rigid circuit boards used in indoor and outdoor LED lighting and other outdoor display applications. As an optically clear encapsulant, it protects LEDs from moisture and surface contaminants while preserving optical performance.
  • Formulation and cure. EI-2888 features a 1:1 mix ratio and cures at room temperature with optional heat acceleration. Because it is self-priming, it requires only good cleaning of the substrate rather than a separate primer step. Dow describes it as a medium-viscosity, soft encapsulant with high transparency and reduced yellowing, and it contains its own moisture source, so cure progresses evenly in deep sections or confined spaces.
  • Processing flexibility. The encapsulant can be applied and dispensed in a variety of ways, including automatic static or dynamic metering, manual mixing, and flow, pour, or needle dispensing. It is also compatible with hand stirring, static and dynamic mixing, and centrifuge mixing, giving manufacturers flexibility to fit existing lines and light-fixture geometries.
  • Cure behavior. Cure begins with mixing, evidenced by a gradual increase in viscosity, followed by gelation and conversion to a solid elastomer. Pot life is the time for viscosity to double after Parts A and B are mixed and is highly temperature- and application-dependent; users should consult the data table for gel and full-cure times under their conditions.

Recommended For

  • Encapsulating rigid and flexible circuit boards
  • Indoor and outdoor LED lighting
  • Explosion-proof and high ingress-protection-rated luminaires
  • Outdoor display applications
  • Potting of PCB system assemblies with delicate components

Available Variants

  • EI-2888 PRIMERLESS ENCAP A 19KG PAIL — Part A, 19 kg pail
  • EI-2888 PRIMERLESS ENCAP B 19KG PAIL — Part B, 19 kg pail
  • The two items are the matched components of a single system: Part A and Part B are combined at a 1:1 ratio to form the cured encapsulant. Both are needed to use the product, so they are ordered together rather than as alternatives.

Product Details

  • Product type: Two-part, self-priming silicone encapsulant
  • Color: Clear / optically clear
  • Mix ratio: 1:1
  • Viscosity: Low to medium viscosity
  • Cure: Room temperature with optional heat acceleration
  • Notable traits: Self-priming, high transparency, reduced yellowing, contains its own moisture source for even cure
  • Container sizes: Part A 19 kg pail; Part B 19 kg pail

Primary Industries

  • LED lighting manufacturing
  • Electronics and PCB manufacturing
  • Outdoor display and signage
  • Industrial and hazardous-location lighting

Standards and Certifications

  • None specified by source
Reviews

FAQs

What is DOWSIL EI-2888 designed to protect?

It is an optically clear, self-priming silicone encapsulant that protects LEDs and circuit boards from moisture and surface contaminants. It is designed for indoor and outdoor LED lighting, explosion-proof and high-ingress-protection-rated luminaires, and outdoor displays, all while preserving the optical performance those applications require.

What does 'primerless' or 'self-priming' mean here?

Standard encapsulants often require a separate primer and thorough cleaning for adhesion. EI-2888 is self-priming, so it requires only good cleaning of the substrate rather than an additional primer step. This can simplify the process and reduce the number of materials and operations on the production line.

How is EI-2888 mixed and cured?

It uses a simple 1:1 mix ratio of Part A to Part B and cures at room temperature, with optional heat acceleration for faster processing. Because it carries its own moisture source, cure progresses evenly through deep sections and confined spaces, which suits fully potted light fixtures and assemblies.

How can it be dispensed?

The encapsulant supports many methods, including automatic static or dynamic metering, manual mixing, and flow, pour, or needle dispensing, as well as hand stirring and centrifuge mixing. That flexibility lets manufacturers match the material to existing equipment and to a wide range of fixture shapes and production volumes.

Do I need to order both Part A and Part B?

Yes. Part A and Part B are the matched halves of one system and are combined 1:1 to cure. Neither part works alone, so both pails are required to use the product. Order them together and store per the Safety Data Sheet guidance for best results.