what are vacuum filter bags made of？

Vacuum filter bags are typically made from one or more of the following materials:

Paper: Many vacuum filter bags are made from heavy-duty paper, which is cost-effective and offers a basic level of filtration suitable for everyday use. These bags usually consist of multiple layers to improve their filtration efficiency.

Synthetic Materials: Some vacuum filter bags are made from synthetic materials such as polypropylene, polyester, or a combination of synthetic fibers. These materials are more durable and offer better filtration performance compared to paper. They can capture smaller particles and allergens more effectively.

Microfiber: High-end vacuum filter bags may use microfiber materials. Microfibers are extremely fine fibers that can trap very small particles, including allergens and fine dust. This makes them ideal for households with allergy sufferers or where superior air quality is desired.

HEPA (High-Efficiency Particulate Air): Some vacuum filter bags incorporate HEPA filters, which are designed to trap 99.97% of particles that are 0.3 microns in size or larger. HEPA filter bags are often made from a combination of synthetic fibers and other advanced filtration materials.

Multi-layer Composites: To enhance performance, some vacuum filter bags are constructed from multiple layers of different materials, each designed to capture different types of particles. These composite bags offer a high level of filtration efficiency and durability.

The choice of material depends on the specific requirements of the vacuum cleaner and the desired level of filtration. High-performance bags, particularly those designed for use in environments where allergens or very fine dust are a concern, often use advanced materials like synthetic fibers, microfiber, or HEPA-grade materials.