The material comes in two large 55 gallon drums – an iso and a resin. When tested to BS476 Part 7 the foam achieves a Class 1 surface spread of flame. It has less chemical off-gassing during application. It is safe, environmentally sound, non-allergenic, and dust and fibre free. However, open cell spray foam is less dense and rigid than closed cell. Heat naturally rises up through a building, which is why the first and second floors tend to be warmer than the ground floor or basements. Polyurethane spray foam adheres directly to the internal metal surface. The two liquids travel up through a heated hose to the spray gun where they are combined to create the foam. Agrispray® OS is an HCFC AND CFC FREE two component, 1:1 ratio, rigid foam system which when processed through suitable spray machinery will produce a rigid foam of approximate density 35kg/m³ with exceptionally good compressive strength. You can recognise open cell as it can be squashed under your hand. Are there different types available for different applications? Mixed on-site, spray foam is sent through a hose into the stud cavity, where it hardens and creates a long-term, barrier that helps keep heat out in the summer -- and in, in the winter. Closed-cell spray foam products typically use synthetic compounds as blowing agents because: Today’s “third generation” of blowing agents have a GWP of 700 to 1000 which is still remarkably high considering water/CO2 has a GWP of 1. There are a huge number of commercial applications for foam insulation. Spray Foam Insulation Cost: Return On Investment There's a saying: "you get what you pay for" - and this is the case when considering which insulation is best for your property. Class 1 System