Owner of Jones Mineral Cabinet, Geology and Paleontology Supervisor, interested in Earth and Planetary sciences. #1. Clastic or Detrital Sedimentary Rocks The class(t)ic route begins with the weathering and erosion of sedimentary, igneous, or metamorphic rocks.
A flame retardant is a chemical substance that is added to materials during their manufacturing process in order to both reduce the likelihood of the finished product catching fire and slow down combustion. Source: GreenFacts.
Touch 'n Foam sealants meet the criteria of flame / smoke spread to be classified as a Class-1 foam. While these sealants are fire retardant (self-extinguishing when flame is removed), they are not intended to be used a fire barrier or fire stop.