Sika Boom 520 Low Expansion

Sika Boom 520 Low Expansion is a one-component, controlled-expansion polyurethane foam suitable for adjustments, fixings, and fillings. It is applied with a special gun, offering easy and precise application, high yield, and the ability to be reused, making it ideal for professional and demanding tasks.

Installation and insulation of door and window frames, staircases
Securing and sealing gaps, joints, cavities, and connections
Filling wall penetrations and areas around HVAC ducts
Insulating electrical outlets and water pipes

Easy to apply using a Sika® Dispenser gun
Precise dosing with low consumption
Especially suitable for narrow joints
Maintains its elasticity
Fast-curing
Very low secondary expansion
Adheres to all construction materials, such as wood, concrete, metals, aluminum, aerated concrete, and bricks
Excellent thermal insulation
Highly effective sound damping
Mold-resistant, watertight, and paintable