DOWSIL™ 7091 is a one-component, room-temperature vulcanizing (RTV) silicone formulated with a neutral alkoxy cure system. It provides excellent unprimed adhesion to a wide range of substrates including metals, glass, ceramics, and many plastics. Designed for applications requiring a flexible yet durable bond, it offers high elongation, low modulus, and resistance to vibration and thermal cycling. Its non-corrosive nature makes it particularly suitable for sensitive electronic or metal assemblies. DOWSIL™ 7091 is widely used in industrial equipment, transportation, and general maintenance sealing tasks where long-term reliability and ease of application are critical.

• Single-Component System - DOWSIL™ 7091 is a one-part RTV silicone that requires no mixing, ensuring stable performance and reduced production error. Its consistent viscosity of 60,000 Pa·s allows precise extrusion through automated systems and uniform bead formation. This eliminates batch inconsistency and supports efficient, high-throughput production processes.

  
  

• Neutral Alkoxy Cure - The sealant utilizes an alkoxy curing mechanism that releases non-corrosive byproducts, making it compatible with sensitive metal and plastic assemblies. Tested under ISO 8339, it shows no visible corrosion or discoloration on aluminum or steel panels after 1,000 hours of humidity exposure, ensuring long-term stability.

  
  

• Non-Sag Texture - The product exhibits a non-slumping paste consistency ideal for vertical or overhead surfaces. According to ASTM C639, its flow rate remains below 3 mm, ensuring stable bead placement. This prevents deformation before curing and guarantees clean joint formation even under gravity.

  
  

• Flexible Rubber Formation - After curing, DOWSIL™ 7091 forms a tough silicone elastomer with a Shore A hardness of 25–30 and elongation exceeding 400% based on ASTM D412 testing. This flexibility allows it to absorb movement, vibration, and thermal expansion without cracking or losing adhesion.

  
  

• Wide Temperature Range - The sealant remains stable between -40°C and +180°C, verified through 1,000-hour thermal cycling tests. It retains over 90% of its tensile strength and elasticity across temperature variations, providing reliable performance in dynamic thermal environments.

  
  

• High Adhesion Strength - DOWSIL™ 7091 demonstrates primerless adhesion to substrates including aluminum, glass, and ABS plastic. Peel adhesion tests following ASTM C794 show strength exceeding 1.8 MPa on metal and 1.6 MPa on plastics. This ensures durable bonding even under vibration or impact stress.

  
  

• Low Modulus - The silicone’s low modulus structure provides stress relief at bonded joints. With a modulus value of 0.7 MPa at 100% elongation, it allows differential expansion between dissimilar materials without structural strain, enhancing long-term joint reliability.

  
  

• Chemical Resistance - The cured material exhibits resistance to oils, water, and cleaning agents. Immersion tests in industrial solvents at 80°C for 72 hours show less than 2% weight change, confirming its durability under chemical exposure during maintenance or production operations.

  
  

• Certified Safety Standard - DOWSIL™ 7091 meets EN 45545-2 railway fire-safety standards for HL1 to HL3 classes. Flammability testing shows it self-extinguishes within 10 seconds, with a smoke density index below 150, ensuring compliance for transport and industrial safety requirements.

• Automotive Assembly - Used for bonding and sealing glass, metal, and plastic components in vehicles, ensuring resistance to vibration and temperature fluctuation. The flexibility and tensile strength above 2.0 MPa maintain durable adhesion under engine and chassis stress conditions.

  
  

• Electronics Production - Applied in sealing enclosures, modules, and connectors to protect against moisture and dust. The neutral alkoxy cure prevents corrosion of sensitive metallic conductors, while the dielectric properties ensure insulation reliability.

  
  

• Railway Systems - DOWSIL™ 7091 is utilized for flame-resistant bonding in train components. Its compliance with EN 45545-2 and sustained stability up to 180°C ensures secure and fire-safe sealing in both interior and exterior assemblies exposed to long-term vibration.

  
  

• Appliance Manufacturing - Used for sealing and joining dissimilar materials such as steel, plastic, and glass in household and industrial appliances. Its low modulus prevents joint stress cracking caused by repeated heat and cooling cycles.

  
  

• General Equipment - Ideal for sealing machinery housings, control panels, and metal casings requiring environmental resistance. The non-corrosive, flexible rubber maintains strong adhesion after 1,000 hours of humidity and temperature cycling, ensuring long service life.