Film VK-25, VK-25A

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Film VK-25 is a phenol-rubber film adhesive made from an alcohol solution of phenol-formaldehyde varnish FL-511, varnish GR-S, and a rubber mixture solution based on synthetic and natural rubber in solvent (product 4).
Film VK-25A is a phenol-rubber film adhesive made from an alcohol solution of phenol-formaldehyde varnish FL-5111, varnish GR-S, and a rubber mixture solution based on synthetic rubber in solvent (product 4A).

Category: Film Adhesives

Purpose: Industry

Purpose: Aerospace industry

Purpose: Space engineering

Technical Specifications
Main purpose and application

Technical Specifications

1. Appearance:
From light brown to dark brown or blue-green, free from foreign inclusions.
2. Mass fraction of volatiles, %, not less than: 6–11
3. Shear strength, MPa (kgf/cm²), not less than:
  • at 20°C: 20.58 (210)
  • at 80°C: 10.78 (110)
4. Peel strength at 20°C, N/cm (kgf/cm), not less than: 490 (50)

Main purpose and application

VK-25, VK-25A films are designed for bonding metals and non-metallic materials. They replace welding and riveting in aircraft, helicopter construction, and other industries.

Main application areas:
Aviation and space:
  • Bonding helicopter blades, aircraft skin.
  • Replacing rivets in load-bearing structures.
Industry:
  • Mounting brake pads, honeycomb fillers.
  • Bonding textolite with metals.