One component spray polyurethane application

A process comprising:

• a. providing a one-component spray polyurethane foam formulation comprising a blowing agent and prepolymer reaction products resulting from reacting isocyanates and polyols in the presence of a catalyst, the prepolymer having free isocyanate groups at a concentration in a range of 12 to 17 weight-percent based on prepolymer weight and the blowing agent being one or more selected from the group consisting of carbon dioxide, saturated fluorinated hydrocarbons and unsaturated fluorinated hydrocarbons and being present at a concentration of at least 9×10−4 moles per kilogram of foam formulation;
• b. providing a supplemental propellant consisting of a pressurized gas at a pressure of 400 kiloPascals or more and at the same time one MegaPascal or less;
• c. providing a dispensing accessory comprising a removable nozzle that can reversibly disconnect from the rest of the dispensing accessory and that defines a flow channel defined through it, including an exit opening of the flow channel from the dispensing accessory;
• d. feeding the one-component spray polyurethane foam formulation and supplemental propellant independent from one another into the dispensing accessory so that they combine in the removable nozzle;
• and
• e. expelling only the one component spray polyurethane foam formulation and supplemental propellant together from the dispensing accessory from the exit opening of the removable nozzle at a rate that is greater than 40 grams of foam formulation per 15 seconds.