Polyurethane Spray Foam Formula

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Polyurethane spray foam formula is a type of insulation material that is sprayed as a liquid and then expands and hardens into a solid foam. It is a highly effective insulation material, commonly used in building and construction for its excellent heat insulation, air sealing, and moisture barrier properties. There are two main types of polyurethane spray foam: open-cell and closed-cell, each with unique characteristics and uses.

Types of Polyurethane Spray Foam:

  1. Open-Cell Spray Foam:
    • Has a softer and more flexible structure.
    • Lower density (about 0.5 pounds per cubic foot).
    • Offers good insulation with a lower R-value per inch compared to closed-cell foam (typically around R-3.5 to R-4 per inch).
    • More effective as a sound barrier.
    • Allows for moisture permeability, which can be beneficial for managing indoor air quality.
  2. Closed-Cell Spray Foam:
    • More rigid and dense structure (about 1.7 to 2 pounds per cubic foot or higher).
    • Higher R-value per inch (approximately R-6 to R-7 per inch), making it more effective at insulating.
    • Acts as a moisture barrier and can add structural strength to walls.
    • More resistant to water and moisture compared to open-cell foam.
    • Suitable for both interior and exterior applications, including below-grade areas.

Polyurethane spray foam Composition and Application

  • Composition: Polyurethane spray foam is made by combining two main components – a polyol resin and an isocyanate. When these components are mixed, they react to form polyurethane, expanding up to 30-60 times their liquid volume.
  • Application: The foam is applied using a spray gun connected to two containers (often referred to as “Part A” and “Part B”), which contain the polyol resin and the isocyanate, respectively.


  • Energy Efficiency: Provides high insulation value, reducing energy costs.
  • Air Sealing: Effectively seals gaps and cracks, preventing air leaks.
  • Moisture Barrier: Closed-cell foam provides resistance to moisture and water.
  • Durability: Resistant to settling or sagging over time.


  • Cost: Generally more expensive than traditional insulation materials.
  • Installation: Requires professional installation and appropriate safety measures due to the chemicals involved.
  • Environmental Impact: The environmental impact varies depending on the type of blowing agents and other chemicals used in the formulation.

Polyurethane spray foam formula is now using frequently  in residential, commercial, and industrial buildings for its superior insulating properties and versatility. However, careful consideration of its properties and installation requirements is necessary to ensure it’s the right choice for a specific application.