Flame Retardant Nylon

Flame Retardant Nylon is PA6 or PA66 filament carrying a flame-retardant additive, also supplied as moulded holder components. The additive is the whole point of the grade, so it is specified by the rating it has to meet rather than by the polymer name.

Flame Retardant Nylon is used in custom cleaning brushes for cable-entry, enclosure, appliance and transport brushes built around a named flame-retardant resin grade.

The realistic alternatives are PPS Filament and PEEK Filament. What separates them here is moisture uptake and working temperature, not headline strength.

Compare Flame Retardant Nylon with Standard PA6/PA66, PPS, PEEK, flame-retardant polyester. Change material when wet stiffness, temperature, chemical resistance, conductivity, particle shedding, or surface marking becomes the limiting factor.

Flame Retardant Nylon is set by the specific grade, reinforcement and additive package; compare with ordinary filament through sample testing; flame Retardant Nylon changes brush stiffness through filament diameter, free trim, density, crimp, and contact. Use finer filament and longer trim for conformable contact; use coarser filament, shorter trim, or higher density for stronger displacement or cutting.

Published ranges for the filament itself. Read them as a shortlist tool, not as brush performance.

The part people get wrong: stiffness is not a property of the material on its own. A 0.50 mm filament on a 15 mm trim is stiffer than a 0.30 mm filament on a 25 mm trim in the same grade. Fix diameter and trim first, then confirm the material.

Flame Retardant Nylon takes up 1–8% by PA grade.

PA6 and PA66 absorb moisture; PA610, PA612 and PA12 retain stiffness better in wet service; this moisture response matters in cable-entry, enclosure, appliance and transport brushes built around a named flame-retardant resin grade.

What this means for your application: the filament grows and softens as it takes on water, and tip pressure goes with it. The reach you measured dry is not the reach you get wet.

A practical check: run one wet cycle and compare tip contact against the dry state. If the wet brush leaves residue behind or no longer reaches the bottom of the bore, change the material rather than the geometry.

Temperature capability is grade-specific; a flame-retardant additive package does not by itself establish the brush-filament service-temperature limit.

The filament tables quote 150°C continuous and 180°C peak. The tighter number above is the one to build to, because a brush is loaded while it is hot.

Where it stops working: validate with a sample if the process sits near the top of that band. If the filament takes a permanent set under load, step up to PEEK Filament or PPS Filament, which hold a higher continuous temperature.

Diameter, trim length and applied load all shift the real limit, so a thin filament touching lightly survives conditions that would flatten a thick one under pressure.

It stands up to water, oils, mild detergents and dilute alkalis.

What degrades it: strong mineral acids, phenols and strong oxidizers.

Compatibility is a function of concentration, temperature and contact time together. A short rinse in a dilute solution is a different exposure from an overnight soak in a concentrated one, even with the same chemical on the label.

Before you commit to a quantity: Specify the exact Flame Retardant Nylon grade or alloy, filament or profile size, color, straight or crimped form, working temperature, wet or dry use, chemical exposure, surface finish, and any required material documentation.

The floor is roughly 0.15 mm; finer than that and the filament snaps rather than flexes. In practice you are choosing inside 0.15–1.20 mm.

Free trim runs 3–300 mm, and the two interact: a finer filament needs a shorter trim to keep useful stiffness, while a thicker one carries a longer trim and still lands pressure on the tip.

Split the range by duty: roughly 0.15–0.41 mm for light wiping, dusting and surfaces that mark easily, and 0.41–1.20 mm where residue is packed on and point pressure matters more than surface risk.

Tip treatments available on this filament: end rounding, tapered-tip grinding, silicone-oil coating, anti-static coating and antibacterial coating.

In practical brush terms: reaching deep into a bore or crevice is a diameter problem before it is a length problem. A thicker filament on a moderate trim pushes further in before the tips fold over.

Cable-entry, enclosure, appliance and transport brushes built around a named flame-retardant resin grade.

The applications that keep coming back to this grade:

• Industrial Machine Cleaning
• Dust Removal
• Brick, Tile & Building Material Machine Brush Use
• Laboratory Tube Cleaning
• Household Dish, Teapot & Kitchen Detail Cleaning
• Carpet Machine Cleaning

The constructions that usually carry it:

• Custom Handheld Detail Brushes
• Custom Tube & Pipe Bore Brushes
• Custom Roller and Conveyor Brushes
• Custom Polishing Buffing Wheels

If the sample comes back rejected: Flame classification follows the named resin grade and test method; finished-brush classification covers the complete filament, base, holder, and mounting assembly.

Send the brush type, filament diameter, free trim length, density, contact setting, wet or dry duty, working temperature and the actual cleaning chemistry together. Any one of them on its own leaves the stiffness undefined.

What usually goes wrong at this step:

• Selecting Flame Retardant Nylon from the material name alone without setting filament diameter, trim length, and density
• Using dry stiffness to predict wet behavior without checking moisture absorption or liquid exposure
• Ignoring trapped abrasive particles, chemical concentration, temperature, or contact motion when assessing surface risk

Reference standards behind the figures on this page: ISO 527-1:2019; ASTM D638; ISO 62:2008; ASTM D570-22; ISO 868:2003; ASTM D2240-15(2021); ISO 4892-3:2024; ASTM G154-23; UL 94.

Source: Ensinger — Extruded nylon material data. A flame-retardant rating is a UL 94 classification at a stated thickness, not a temperature rating, and the additive package that earns it usually costs some stiffness and moisture behaviour. Ask for the tested thickness alongside the class.