Dimensions to include
- Channel width and height, material and wall thickness
- Overall height and effective trim length
- Filament grade, diameter, straight or crimped form, and fill arrangement
- Cut length, end closure and straightness tolerance
- Holder section, hole positions and installation orientation
Describe the working contact
Record the actual gap, working deflection, movement direction, speed, contacted surface and acceptable wear. A longer or thicker filament is not automatically a better seal.
For formed brushes
Specify inner, outer or side-facing bristles, the datum radius, open ends, springback tolerance and assembly drawing. Formed metal channel and flexible polymer backing are different constructions.