Material
Fiberglass Filament
Glass fiber filament
Choose Fiberglass Filament based on its stiffness, recovery, wear, wet-service, chemical, and temperature behavior. Do not select stiffness from the material name alone. Specify filament diameter, free trim, density, grade, and service conditions as one set.
Datasheet values
- Fill construction
- Fiber bundles or monofilament equivalent 0.10–0.80 mm
- Temperature range
- -40–200°C
- Stiffness
- Firm and dimensionally stable
Fiberglass Filament is a glass fiber filament used as brush fill or a cleaning-contact element.
What is Fiberglass Filament, and what makes it different from other brush filaments?
Fiberglass Filament sits in the glass fiber filament family, supplied as fiber bundles or monofilament equivalent 0.10–0.80 mm, drawn in round, triangular, cross-shaped, hollow, star-shaped and rectangular sections and set in straight rows, helical, staggered, zoned, wavy and random fill patterns.
Fiberglass Filament is used in custom cleaning brushes for high-temperature dusting, electrical insulation cleaning and specialty applicator brushes.
Where a project stalls on material choice, the comparison is normally against Nylon PA, PBT and Polypropylene PP, and it turns on moisture uptake and working temperature.
Use a softer polymer or natural fiber for lower marking; use abrasive or metal wire for greater cutting action.
What stiffness and contact pressure can I expect from Fiberglass Filament?
Fiberglass Filament is firm and dimensionally stable.
The published filament ranges, set against the grades it competes with. The finished brush is rated from the whole assembly: fill, anchoring and adhesive each have their own limit.
| Property | Fiberglass Filament | Nylon PA | PBT | Polypropylene PP |
|---|---|---|---|---|
| Shore hardness | Firm and dimensionally stable | Medium to firm; filament diameter and trim length control bending force. | Shore D 80–90 | Shore D 65–75 |
| Continuous temperature (°C) | 200 | 93 | 120–140 | 80–100 |
| Peak temperature (°C) | 230 | 121 | 160–180 | 120–140 |
| Water absorption, 24 h | 0.1–1.0% (24 h; industry reference range) | 0.3–9% by PA grade and conditioning | 0.05–0.20% (24h, ISO 62/ASTM D570) | ≤0.03% (24h, ISO 62/ASTM D570) |
| Filament diameter (mm) | 0.05–3.00 | 0.08–2.50 | 0.03–2.00 | 0.08–3.00 |
| Flexibility | Medium to High Flexibility | Medium to High Flexibility | Medium to High Flexibility | Medium Flexibility |
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.
How does water affect Fiberglass Filament performance?
Fiberglass Filament takes up 0.1–1.0% (24 h; industry reference range).
Suitable for the wet or dry conditions stated in the application list; wash and dry retained-residue constructions after use.
What this means for your application: moisture uptake is low enough to ignore in service, which is why this grade holds its stiffness through washdown.
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.
What temperature limits apply to Fiberglass Filament?
-40–200°C.
The filament tables quote 200°C continuous and 230°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: 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.
What chemicals attack Fiberglass Filament?
Use the grade-specific chemical profile and confirm it against the actual chemical, temperature, exposure-time, and load conditions of your application.
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 Fiberglass Filament form, diameter or grade, trim, density, working temperature, cleaning fluid, and surface finish.
What is the practical lower limit for filament diameter?
The floor is roughly 0.05 mm; finer than that and the filament snaps rather than flexes. In practice you are choosing inside 0.05–3.00 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 0.05–0.79 mm for light wiping, dusting and surfaces that mark easily, and 0.79–3.00 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.
What applications typically use Fiberglass Filament?
High-temperature dusting, electrical insulation cleaning and specialty applicator brushes.
The cleaning work it is specified for most often:
- Industrial Machine Cleaning
- Dust Removal
- Brick, Tile & Building Material Machine Brush Use
- Laboratory Tube Cleaning
- Household Dish, Teapot & Kitchen Detail Cleaning
- Carpet Machine Cleaning
Brush types built with this fill:
- Custom Handheld Detail Brushes
- Custom Tube & Pipe Bore Brushes
- Custom Roller and Conveyor Brushes
- Custom Polishing Buffing Wheels
If the sample comes back rejected: Brittle under sharp bending and can shed glass fragments; avoid sensitive surfaces.
How do I specify Fiberglass Filament for a custom brush?
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 Fiberglass Filament without setting diameter, trim and density
- Using the material on a surface that cannot accept its contact level
- Ignoring temperature, liquid, motion or residue retention
Reference standards behind the figures on this page: ASTM D3039/D3039M; ISO 14125.
Source: American Brush Manufacturers Association — Brush Lingo — filament and fill terminology. Glass filament is stiff, heat-tolerant and abrasive to the surface it touches, and it breaks rather than bends when overloaded. Handle and enclose it as a fibre-release hazard, not as a conventional filament.
What else does the datasheet specify for Fiberglass Filament?
| Filament cross-section | Round/Triangular/Cross-Shaped/Hollow/Star-Shaped/Rectangular |
|---|---|
| Electrical behaviour | Insulating |
Questions this page is asked
How should glass-fragment release be tested from a fiberglass brush?
Cycle the actual bundle radius, trim, deflection and speed through the intended dry, wet and thermal conditions while collecting debris on a clean witness surface or filter. Count and size loose fragments, inspect bundle fractures and measure force retention at intervals, then exclude the construction from sensitive surfaces if the agreed particle or sharp-fragment limit is exceeded.
What should remain after a fiberglass brush sees heat or cleaning cycles?
Verify bundle strength, sizing condition, tuft retention, dimensional stability, particle level and the complete assembly's required insulation or leakage performance after the specified cycle. Test the contaminated and cleaned states separately, since glass itself may remain insulating while retained conductive soil, moisture, damaged sizing or metal anchors change the practical result.
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.
Custom Manufacturing RFQ
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Custom Brush RFQ
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Upload a drawing, product photo, or sample photo and provide the core dimensions and cleaning conditions.
“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.”