Microfiber

Microfiber sits in the synthetic textile fiber family, supplied as ultra-microfiber cloth strip, knitted sleeve, microfiber pad, nonwoven polyester and polyamide structure, drawn in round, wedge, orange-segment and multi-lobed sections and set in straight rows, staggered, zoned, random and fabric-wrapped fill patterns.

Microfiber is used in custom cleaning brushes for fine dust, fingerprint, film and polishing-residue removal from glass, displays and finished panels.

Where a project stalls on material choice, the comparison is normally against Cotton Yarn, Wool and Felt, and it turns on moisture uptake and working temperature.

Compare Microfiber with Cotton yarn, wool, felt, soft PBT filament. Change material when wet stiffness, temperature, chemical resistance, conductivity, particle shedding, or surface marking becomes the limiting factor.

Microfiber is very soft; it conforms to fine surface texture rather than acting as a self-supporting bristle. It Microfiber 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.

The published filament ranges, set against the grades it competes with. These are filament figures, not finished-brush values.

The part people get wrong: the number that decides scrubbing pressure is diameter over trim length, not the grade name. Two brushes in this material can behave nothing alike.

The polyester and polyamide in microfiber take up only about 0.2–1.0% themselves; the structure is what does the work, holding on the order of three to seven times its own weight in liquid.

Absorbent porous structure for wiping, washing, drying and liquid transfer.

What this means for your application: the fiber does not swell, but the cloth does load. Once it is saturated it stops lifting and starts spreading, which is why the cycle is wipe, wring, wipe rather than wipe until it looks dirty.

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 depends on the microfiber polymer and construction; confirm the actual fiber composition before heated service.

The filament tables quote 80–120°C continuous and 140–170°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. A permanent bend under load means the answer is a higher-temperature filament family, not a heavier trim.

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.

Compatible with water and mild detergent; solvent and oxidizer resistance follows the fiber, foam and binder chemistry.

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 Microfiber 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 0.005 mm; finer than that and the filament snaps rather than flexes. In practice you are choosing inside 0.005–0.050 mm.

Free trim runs 2–80 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 0.005–0.02 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: fiber splitting, brushing, hydrophilic finish, anti-static 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.

Fine dust, fingerprint, film and polishing-residue removal from glass, displays and finished panels.

The cleaning work it is specified for most often:

• Automotive Detail Cleaning
• Motorcycle Chain Cleaning
• Tire Cleaning
• Wheel & Rim Cleaning
• Industrial Machine Cleaning
• PCB Cleaning

Brush types built with this fill:

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

If the sample comes back rejected: Not suited to heavy scale, sharp burrs, rough debris or processes where textile lint and retained contamination cannot be controlled.

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 Microfiber 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: Toray Industries — Textile fibres and microfibre construction. Microfibre performance comes from filament fineness and the split cross-section, not from the polymer. A split microfibre lifts and holds fine soil; an unsplit fine filament of the same polymer does not.