This product is an INSUTECH APP Modified Bitumen Waterproofing Membrane. It is a torch-on shielding roll engineered primarily for roofing, foundations, and below-grade structure insulation.The core materials used to manufacture this specific sheet include:APP Modified Bitumen: Petroleum-based bitumen combined with Atactic Polypropylene (APP) polymers. This modification gives the compound excellent thermal stability, chemical resistance, and ease of flow under hot torch applications.Polyester Reinforcement: A non-woven polyester carrier core acts as the internal skeleton. This drastically upgrades the membrane's structural properties, providing high mechanical strength, puncture resistance, and elongation flexibility. Red Mineral Slates: The top weathering surface is embedded with a red mineral granule finish.