The ST99 B1 Fire Rated Expanding Foam is specifically designed for use in fire-resistant doorsets with a minimum rating of 30 minutes and 60 minutes. This 750ml can of expanding foam provides a seal and insulation to help prevent the spread of fire, making it an essential product for enhancing the safety and security of your home or property. Ideal for DIY enthusiasts and professionals alike, this fire-rated foam is a reliable and effective solution for keeping your living space protected.