Guangzhou Eric Wei Chemical Co., Ltd.
Guangzhou Eric Wei Chemical Co., Ltd.

Dow DOWSIL 866 Primerless Silicone Adhesive

Dow DOWSIL 866 Primerless Silicone Adhesive is a one-component, moisture-curing silicone sealant offering excellent adhesion to glass, aluminum, and painted surfaces without primers. It delivers superior UV resistance, thermal stability from −40°C to +150°C, and low VOC emissions. Ideal for architectural glazing and curtain wall applications where reliability and ease of use are critical.
  • dow dowsil 866 primerless silicone adhesive_21c2a0aa
  • dow dowsil 866 primerless silicone adhesive_21c2a0aa

Features Of Dow DOWSIL 866 Primerless Silicone Adhesive

  1. Primerless adhesion to challenging substrates including anodized aluminum, powder-coated metals, and painted surfaces without surface pretreatment.

  2. High-performance one-component, moisture-curing silicone adhesive with excellent long-term durability and UV resistance.

  3. Low modulus formulation provides superior stress relief and accommodates thermal and mechanical movement in dynamic joints.

  4. Non-corrosive to sensitive metals such as copper, brass, and aluminum—ideal for electronics and architectural applications.

  5. Meets ASTM C920 Type S, Grade NS, Class 25, T, NT performance requirements for structural silicone sealants.

Typical Applications Of Dow DOWSIL 866 Primerless Silicone Adhesive

  1. Structural glazing of commercial façades and curtain walls on coated or anodized aluminum framing.

  2. Bonding and sealing of insulated glass (IG) units with non-standard or pre-finished spacers and frames.

  3. Attachment of architectural metal panels, signage, and decorative cladding systems without priming.

  4. Sealing and bonding in transportation applications including railcar and bus exterior assemblies.

  5. Electronics enclosures and LED lighting housings requiring non-corrosive, low-stress adhesion.

Specifications Of Dow DOWSIL 866 Primerless Silicone Adhesive

Chemical TypeAcetoxy-cure silicone polymer
Product FormThixotropic paste, single-component
AppearanceOpaque white or gray (depending on variant)
Primary ApplicationsStructural glazing, architectural bonding, IG unit assembly
Key FeaturesPrimerless adhesion, low modulus, non-corrosive, UV stable
BenefitsReduced labor and process steps, improved production efficiency, enhanced joint longevity
Curing MechanismMoisture-cured at ambient temperature
Shelf Life (unopened)12 months from date of manufacture when stored at ≤25°C


Get in Touch with ERICW
Let competitive chemical materials go global.

Your Name *

Your Email *

Your Phone

Country

Your Message *