Quick Answer
Food and washdown brush design covers the complete assembly, not only the filament. Select fill, block/core, staple or resin, shaft, adhesive, color, and surface finish for the contact zone, cleaning chemistry, temperature, and sanitation method.
Define the Contact Zone
| Zone | Design focus |
|---|---|
| Direct food contact | Cleanable materials, secure retention, visible color, smooth geometry, and documented grade |
| Splash / indirect contact | Washdown resistance, drainage, corrosion control, and segregation |
| Non-product equipment area | Durability, chemical resistance, and control of transfer into product zones |
| High-temperature bakery / oven | Heat-resistant wire or polymer, compatible core/shaft, and deposit removal |
Material Direction
Nylon 612 gives recovery and low water uptake for wet mechanical cleaning. PBT keeps stiffness stable through wash cycles and higher heat. Polypropylene offers broad chemical resistance and negligible water uptake. Stainless wire is used for compatible hot or hard-deposit applications. The selected grade, colorant, resin, staple, and core must all match the required contact specification.
Cleanable Construction
- Avoid crevices, open hollow spaces, rough welds, exposed absorbent materials, and trapped water.
- Use smooth cores, sealed ends, corrosion-resistant shafts, and replaceable sections where inspection is required.
- Set filament density so soil and wash water can leave the face.
- Use color zoning and dedicated storage to prevent cross-use.
- Inspect for retained soil, loose filament, cracked blocks, corrosion, and permanent deformation.
Process Data
Record soil type, contact zone, wash chemical, concentration, water temperature, steam, exposure time, brush speed, line speed, cleaning frequency, rinse, drying, sanitation method, and storage. For conveyors, include belt material, width, tracking, return-side location, and debris collection.
When to Combine Methods
Use pre-rinse, heated wash, scraper, spray bar, foam, vacuum, or air knife when the brush alone cannot remove bulk sticky soil or carry it away. A brush should expose and move residue; the process must also transport that residue out of the product zone.
Technical References
- eCFR — 21 CFR Part 117 Human Food CGMP
- eCFR — 21 CFR 178.1010 Sanitizing Solutions
- eCFR — 21 CFR 177.1520 Olefin Polymers
Which bristle material fits this job — Polypropylene PP, PA612 Nylon or PBT?
| Material | Continuous temperature (°C) | Peak temperature (°C) | Water absorption | Hardness |
|---|---|---|---|---|
| Polypropylene PP | 80–100 | 120–140 | ≤0.03% | Shore D 65–75 |
| PA612 Nylon | 90–110 | 130–150 | 0.3–0.7% | Shore D 70–80 |
| PBT | 120–140 | 160–180 | 0.05–0.20% | Shore D 80–90 |
Figures as published by Perlon; Brushtec / DuPont. Confirm the exact grade against the supplier datasheet before ordering.
When are Roller and Conveyor Brushes the wrong choice?
- Roller and Conveyor Brushes — Use a stationary strip brush for a fixed linear seal or wipe, or another process when rotating line contact interferes with the product or cannot discharge the residue safely.
- Handheld Detail Brushes — Use a tube brush, powered brush, scraper, wipe, sponge, or vacuum when the target is internal, heavily bonded, or highly delicate.
- Polypropylene PP — Avoid high-temperature brushing or heavy abrasion where nylon/abrasive nylon is needed.
- PA612 Nylon — PA612 costs more than general PA6 and should be used where its wet stability, recovery or wear life creates a real process benefit.
What should replace Roller and Conveyor Brushes when they stop working?
- Roller and Conveyor Brushes — Roller and conveyor brushes hold cylindrical line contact across a working width, including helix-wound builds where the filament path is set to move loosened material toward one side; a strip brush holds the same line without rotating, so it seals or wipes but cannot carry residue along the width.
- Handheld Detail Brushes — Handheld detail brushes cover general precision cleaning; auto-detailing brushes impose tighter controls for painted, polished, leather, display, and trim surfaces.
- Polypropylene PP — Compare Polypropylene PP with Nylon, PBT, PET. Change material when wet stiffness, temperature, chemical resistance, conductivity, particle shedding, or surface marking becomes the limiting factor.
- PA612 Nylon — Compare PA612 Nylon with PA66, PP, PBT. Change material when wet stiffness, temperature, chemical resistance, conductivity, particle shedding, or surface marking becomes the limiting factor.