It seems like you're mentioning a type of membrane, specifically a 7-layered membrane, made from polyester and HMHDPE reinforcement. Membranes like these are often used in various applications for their durability, strength, and resistance to different environmental factors. Let's break down some of the key components:

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APP Membrane: "APP" stands for Atactic Polypropylene, which is a type of polymer used in roofing and waterproofing membranes. These membranes are commonly used in construction for creating waterproof barriers in roofs, basements, and other structures. They are known for their excellent heat resistance and durability.

Polyester: Polyester is a synthetic polymer that is often used for its strength and durability. In the context of membranes, polyester reinforcement provides added tensile strength and stability to the material. It helps the membrane withstand stretching and tearing forces.

HMHDPE: HMHDPE stands for High Molecular High-Density Polyethylene. Like polyester, HDPE is a type of polymer with high strength and toughness. Adding HMHDPE reinforcement to the membrane further enhances its mechanical properties, making it more resistant to punctures, tears, and other forms of damage.

7-Layered Membrane: The mention of a "7-layered" membrane likely refers to a membrane constructed from multiple layers of different materials. Each layer might serve a specific purpose, such as providing waterproofing, reinforcement, heat resistance, and other desired properties. This layered approach allows for a combination of the best attributes of each material.

In summary, a 7-layered membrane made from polyester and HMHDPE reinforcement is likely used in construction and other applications where waterproofing, durability, and strength are crucial. The combination of materials in the layers contributes to the membrane's overall performance and longevity.