Some of it can stay trapped inside the foam and slowly get released over the life of the product. So that blowing agent can end up contributing to different parts of the LCA: A1: making the blowing agent\ A3: emissions during manufacturing\ B1: release during use\ C4: release at end of life Which means the factory gate is not always the end of the story. You can have two insulation products with similar thickness, similar thermal performance and similar material quantities, but very different GWP results because of the blowing agent they use.
