The filament is the working part of any industrial brush. Choose the wrong material and the brush wears in days, scratches the surface, or dissolves in the chemical environment. But filament selection is not complicated once you know what each material is good at and where it fails. This guide covers the six most-used industrial brush filament types, with the data you need to make an informed choice before you order.
Nylon 6.6: the general-purpose workhorse
Nylon 6.6 is the most common industrial brush filament for a reason. It offers high tensile strength, good abrasion resistance, and stable stiffness across a wide temperature range (up to about 120°C continuous). It absorbs some moisture, which actually improves flexibility in wet applications, though it can swell slightly and lose stiffness if soaked for extended periods. Use Nylon 6.6 for general scrubbing, conveyor cleaning, and most wet or dry industrial cleaning applications where no special chemical or temperature requirement rules it out. For disk brushes on floor scrubbers, it is the default recommendation.
Nylon 6: the flexible alternative
Nylon 6 is slightly softer and more flexible than 6.6, with marginally lower heat resistance. It is a better choice for polished or sensitive surfaces where 6.6 would micro-scratch, and for applications where the brush needs to conform to irregular contours. It costs slightly less and processes easily, so custom profiles can be extruded efficiently. The practical difference for most buyers: if Nylon 6.6 is too stiff for your surface, try Nylon 6 before moving to polypropylene.
Polypropylene (PP): chemical resistance on a budget
PP is the filament to reach for when the environment is chemically aggressive: acids, alkalis, and most organic solvents leave it largely unaffected, where nylon would degrade. It is also the most cost-effective synthetic filament. The trade-offs: PP is softer than nylon, deforms permanently above roughly 80°C, and can become brittle in freezing conditions. It is widely used in food-processing strip brushes and wet-cleaning applications where chemical resistance matters more than stiffness.
Steel wire: heavy rust and weld cleaning
Crimped steel wire bristles are the aggressive option for rust removal, weld-slag cleaning, heavy deburring, and surface preparation on steel. They cut quickly and wear predictably, but leave ferrous residue on the workpiece — a problem for stainless steel or aluminium that will later corrode if the residue is not removed. Steel wire brushes are also available in knotted configurations for extreme cutting action. Use them on cylinder brushes for pipeline cleaning and on disk brushes for angle-grinder-scale removal.
Brass wire: non-sparking and residue-free
Brass wire is softer than steel and non-sparking, making it suitable for ATEX-rated environments and for cleaning softer metals such as copper, aluminium, and brass itself without leaving ferrous contamination. Brass does not rust, so it performs well in humid or intermittently wet conditions. The trade-off is faster wear than steel; size the brush accordingly or replace more frequently. Brass wire is commonly ordered in small roller brushes and hand-fed cleaning tools for precision work.
Abrasive nylon (silicon carbide): finishing in one pass
Abrasive nylon is standard nylon filament impregnated with silicon carbide or aluminium-oxide grit throughout the strand — not just coated on the surface. As the filament wears, fresh grit is continuously exposed, so cutting performance stays consistent over the brush’s life. It combines the conformability of a brush with the material-removal capability of a grinding wheel, making it the go-to choice for deburring machined edges, edge radiusing, and surface finishing in a single pass. It is more expensive per brush than plain nylon but can eliminate a separate grinding or polishing step.
How to decide: a quick-reference table
| Requirement | Recommended filament |
|---|---|
| General industrial scrubbing, wet or dry | Nylon 6.6 |
| Polished or sensitive surface | Nylon 6 |
| Acid, alkali, or solvent exposure | Polypropylene (PP) |
| Heavy rust, weld cleaning, steel prep | Steel wire |
| Non-sparking, aluminium/copper cleaning | Brass wire |
| Deburring, edge radiusing, one-pass finishing | Abrasive nylon (SiC) |
| High-temperature (>120°C) | Steel or brass; consult for engineered synthetics |
Filament diameter and trim length fine-tune the result. Thicker filaments are stiffer and more aggressive; longer trim increases flex and conformability. A good manufacturer will adjust both based on your operating conditions once the material is chosen. For a complete walk-through of matching the filament to the brush family and your machine, see our guide on how to choose the right industrial brush.
Related products
- Disk brushes — custom OEM, any filament
- Strip brushes — nylon, PP, or specialty materials
- Cylinder brushes — steel wire, brass, or abrasive
Want a filament recommendation specific to your application?
Send Pamin a description of the surface, the operating conditions, and a photo of your current brush if you have one. We will confirm the right filament, diameter, and trim length, and quote factory-direct pricing with flexible MOQs from 300 pieces. Request a quote today — usually within one business day.