The Advantage of Non-Metallic Flexibility
Unlike metal expansion joints, which are limited by the physical properties of steel, Non-metallic Fabric Expansion Joints utilize advanced composite materials. In low-pressure ducting systems where large axial and lateral movements occur simultaneously, fabric joints provide a level of flexibility that metal simply cannot match.
1. Multi-Layer Composite Construction
A B-NAI fabric expansion joint is an engineered stack of specialized materials:
Outer Layer (Weather Cover): PTFE or Silicone-coated fiberglass to resist UV, rain, and external corrosion.
Insulation Layers: Thick fiberglass or ceramic felt to protect the outer skin from extreme internal heat.
Sealing Layer: A gas-tight barrier (often PTFE) that prevents corrosive flue gases from escaping.
2. Solving the Corrosion Problem
In Flue Gas Desulfurization (FGD) systems, the presence of acids can quickly destroy stainless steel bellows. Our fabric joints are naturally immune to this chemical attack. By selecting the right fluoro-elastomers and technical fabrics, B-NAI ensures that your ducting system remains maintenance-free even in the most aggressive chemical environments.
3. Reduced Anchor Loads
Because fabric joints are inherently “soft,” they require significantly lower forces to compress or extend. This means engineers can design lighter, more cost-effective piping supports and anchors, reducing the overall cost of the infrastructure project.
