Material
Aramid Fiber
Aramid fiber filament
Choose Aramid Fiber based on its stiffness, recovery, wear, wet-service, chemical, and temperature behavior. To define stiffness, confirm the material together with filament diameter, free trim length, density, grade, and service conditions.
Datasheet values
- Fiber diameter
- 12–15 µm
- Density
- 1.44 g/cm³
- Tensile strength
- 2.8–3.6 GPa
- Decomposition temperature
- above 450°C
Aramid is an aromatic polyamide fiber family; para-aramid and meta-aramid grades differ in modulus, textile behavior and thermal role.
What is Aramid Fiber, and what makes it different from other brush filaments?
In the aramid fiber filament family, Aramid Fiber is specified, supplied as fiber bristle, drawn in round and flat bundle sections and set in straight rows, staggered, zoned and fan pattern fill patterns.
Aramid Fiber is used in custom cleaning brushes for heat-exposed wiping and wear-resistant flexible contact where metal wire would damage the surface.
Compare Aramid Fiber with Compare para-aramid for strength and abrasion with meta-aramid for thermal textile duty, compare nylon for economical general wear. Change material when wet stiffness, temperature, chemical resistance, conductivity, particle shedding, or surface marking becomes the limiting factor.
What stiffness and contact pressure can I expect from Aramid Fiber?
Aramid Fiber is flexible high-strength fiber; para-aramid has high modulus while meta-aramid behaves more like a thermal textile. Use finer filament and longer trim for conformable contact; use coarser filament, shorter trim, or higher density for stronger displacement or cutting.
The part people get wrong: the same grade can feel soft or aggressive depending on diameter, trim and density. Specify that geometry before the material, or the sample will surprise you.
How does water affect Aramid Fiber performance?
Aramid takes up roughly 2–7% moisture depending on grade and ambient humidity — enough to matter where trim is held to a tolerance, not enough to soften the fiber.
Available for wet service with the correct filament and holder.
What this means for your application: absorbed water swells the filament and drops contact pressure, so a brush that reached the far end of a bore when dry may stop short once it is wet.
A practical check: soak a sample for an hour and re-measure the trim. If it has moved enough to change the contact band, the grade is wrong for the duty.
What temperature limits apply to Aramid Fiber?
Up to 200°C.
Where it stops working: A permanent bend under load means the answer is a higher-temperature filament family, not a heavier trim.
The usable limit also moves with diameter, trim and contact pressure. A fine filament under light load tolerates more than a thick one under heavy scrubbing.
What chemicals attack Aramid Fiber?
It stands up to many oils and solvents.
The same cleaner can be harmless or destructive depending on how strong it is, how hot it runs and how long it sits. Quote the concentration and the dwell time, not just the product name.
Before you commit to a quantity: Specify the exact Aramid Fiber 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.
What is the practical lower limit for filament diameter?
About 0.010 mm. Below that the filament turns fragile and breaks under ordinary contact pressure, so 0.010–0.050 mm is the working range.
Free trim runs 3–120 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 0.010–0.02 mm for light wiping, dusting and surfaces that mark easily, and 0.02–0.050 mm where residue is packed on and point pressure matters more than surface risk.
Tip treatments available on this filament: sizing, plasma treatment, wear-resistant coating and end trimming.
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.
What applications typically use Aramid Fiber?
Heat-exposed wiping and wear-resistant flexible contact where metal wire would damage the surface.
Where it turns up in practice:
- Food Equipment Cleaning
- Household Dish, Teapot & Kitchen Detail Cleaning
- Bakery Tray Cleaning
- Beverage Equipment Cleaning
It is normally set into these constructions:
- Custom Handheld Detail Brushes
The trade-off: Para-aramid and meta-aramid differ in stiffness, heat resistance, moisture response, and compatibility with sizing, binder, and holder construction.
How do I specify Aramid Fiber for a custom brush?
A usable specification carries the construction, the filament diameter and free trim, the density and contact setting, and the service conditions: wet or dry, temperature, and what the cleaner actually is.
The mistakes that most often send a sample back:
- Selecting Aramid Fiber 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; ISO 6892-1; ASTM E8/E8M; ASTM B117; ASTM D3039/D3039M; ISO 14125.
Source: DuPont — Kevlar aramid fibre properties. Aramid brings heat resistance and cut resistance without the conductivity of a metal wire. It is weakened by prolonged UV exposure, so an outdoor application needs either shielding or a different fibre.
What else does the datasheet specify for Aramid Fiber?
| Filament cross-section | Round / Flat Bundle |
|---|---|
| Electrical behaviour | Insulating; Conductive Coating Available |
| Continuous service temperature (°C) | 160–200 |
| Peak temperature (°C) | 250–300 |
Questions this page is asked
How should aramid fill be qualified for a hot or intermittently wet brush process?
Cycle the complete brush through the actual peak and dwell temperature, humidity or wetting, cleaner concentration, rinse, drying, mechanical flex and cooling sequence while under representative contact load. Compare dimensional recovery, bundle stiffness, tensile or pullout retention, discoloration, embrittlement and cleaning result, and do not transfer dry-yarn or short-exposure data to another aramid family or finish.
Which wear signs should retire an aramid-fiber brush?
Inspect at defined intervals for fuzzing, split bundles, short broken fibres, glazed or heat-darkened areas, retained process residue, exposed anchors and loss of trim profile or contact uniformity. Retire the brush when fibre loss, transferred residue, attachment damage or changed process output exceeds the application limit, even if most of the nominal trim length remains.
Where these figures come from
| Property | Published value | Source |
|---|---|---|
| Chemical resistance | Good resistance to many oils and solvents; Test strong acids/alkalis and oxidizers by grade. | DuPont Retrieved 2026-07-20 |
| Published datasheet figures |
|
DuPont Retrieved 2026-07-20 |
| Hardness and stiffness | Flexible high-strength fiber; para-aramid has high modulus while meta-aramid behaves more like a thermal textile. | DuPont Retrieved 2026-07-20 |
| Limitations | Para-aramid and meta-aramid differ in stiffness, heat resistance, moisture response, and compatibility with sizing, binder, and holder construction. | DuPont Retrieved 2026-07-20 |
| Temperature resistance | Up to 200°C. | DuPont Retrieved 2026-07-20 |
| Water resistance | Available for wet service with the correct filament and holder. | DuPont Retrieved 2026-07-20 |
Guides that go deeper on this
We have not written a guide specific to this one yet. The material that covers selection, filament, dimensions, maintenance and sourcing is collected in the technical resources library.
No catalogue item for this yet
Every brush here is made to order, and this one has no catalogue entry so far. Send the working surface, the residue, the access opening and the quantity, and it is quoted through the same specification route as the rest of the range.
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“We need a brush to remove wet residue from a stainless steel conveyor, about 800mm wide. The current brush wears quickly. We can send photos.”
“We sell drinkware and need a cleaning brush to include with the product. Quantity around 5,000 pieces.”