Dual-Extrusion

In general, dual-extrusions consist of a rigid section and a flexible section. The rigid material holds the shape and provides a structure for attachment. The flexible material creates a water or dust-tight seal, a cushion and/or absorbs impact. A dual-extrusion can perform the same functions as two individual profiles that have been assembled. Many dual-extrusions simply snap, push or press in place. Although the basic rules for thermoplastic design apply to dual-extrusions, there are certain limitations. For example, the minimum wall thickness of the rigid sections is 0.020 inches. the minimum thickness for the flexible section is 0.005 inches. Dimensional tolerances for dual-extrusions follow the same basic principles as those for single extrusions.