Material
Sisal Fiber
Natural plant fiber
Choose Sisal Fiber based on its stiffness, recovery, wear, wet-service, chemical, and temperature behavior. Material name alone is not enough to set stiffness; we also need filament diameter, free trim, density, grade, and working conditions.
Datasheet values
- Fiber form
- Natural sisal fiber
- Moisture behavior
- Hydrophilic; wetting changes mechanical behavior and drying condition
- Temperature use
- No universal continuous brush-service value; validate time and temperature for the actual process
- Brush stiffness
- Medium to firm depending on fiber bundle, trim, density and construction
- Compound carrying
- Useful in buffing and polishing constructions
Sisal is a leaf fiber from Agave sisalana, valued for strength and absorbency in traditional fiber applications.
What is Sisal Fiber, and what makes it different from other brush filaments?
Sisal Fiber sits in the natural plant fiber family, supplied as natural fiber, drawn in natural polygonal and bundled sections and set in straight rows, staggered, zoned and random fill patterns.
Sisal Fiber is used in custom cleaning brushes for rough buffing, polishing and surface preparation of wood and metal with a firm natural fiber.
Where a project stalls on material choice, the comparison is normally against Cotton Yarn, Felt and Abrasive Nylon, and it turns on moisture uptake and working temperature.
Compare Sisal Fiber with Cotton, felt, abrasive nylon. 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 Sisal Fiber?
Sisal Fiber is a coarse plant fibre, stiff for a natural material: it is firmer than tampico and is used where a natural fibre has to scrub rather than dust, while still being much softer than wire. 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. The finished brush is rated from the whole assembly: fill, anchoring and adhesive each have their own limit.
| Property | Sisal Fiber | Cotton Yarn | Felt | Abrasive Nylon |
|---|---|---|---|---|
| Shore hardness | Not applicable (Natural Fibers Have No Uniform Shore/Rockwell Hardness; industry reference range) | Not applicable (Yarn Has No Uniform Shore/Rockwell Hardness; industry reference range) | Broad range from soft conformable pad to dense firm polishing wheel; density and thickness stated. | Abrasive filament; stiffness and cutting level are controlled by PA base, grit type, grit size, filament diameter and trim height. |
| Continuous temperature (°C) | 70–90 | 80–100 | 120 | 120 |
| Peak temperature (°C) | 110–130 | 130–150 | 150 | 150 |
| Water absorption, 24 h | 10–20% (Equilibrium Moisture Uptake, industry reference range) | 7–12% (Near the Standard Moisture Regain, industry reference range) | Not applicable (Closed-Cell / Sheet Structure; Grade Dependent) | 0.1–1.0% (24 h; industry reference range) |
| Filament diameter (mm) | 0.10–0.40 | 0.50–5.00 | Not applicable (Sheet / Foam Structure) | 0.20–1.80 |
| Flexibility | Medium Flexibility | High Flexibility | Low to High Flexibility(Structure Dependent) | Medium to High 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 Sisal Fiber performance?
Sisal takes up roughly 10–20% moisture and its stiffness moves with it, so repeated wet duty has to be validated rather than assumed.
Sisal is hydrophilic and absorbs moisture; wetting can change stiffness and mechanical behavior, so repeated wet service needs validation.
What this means for your application: water changes the working diameter and the spring rate together, so wet performance has to be checked rather than assumed from a dry trial.
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 Sisal Fiber?
Do not use a generic 100°C figure as a continuous brush-service limit. Sisal drying studies show that time and temperature affect moisture removal and discoloration; validate the actual thermal cycle for the finished brush.
Where it stops working: If the filament takes a permanent set under load, step up to Felt or Abrasive Nylon, which hold a higher continuous temperature.
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 Sisal Fiber?
Chemical treatment and alkaline exposure can change sisal properties. Check cleaner chemistry, concentration, exposure time, temperature, and drying conditions before using it in repeated chemical cleaning.
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 Sisal 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 0.10 mm. Below that the filament turns fragile and breaks under ordinary contact pressure, so 0.10–0.40 mm is the working range.
Free trim runs 10–180 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 0.10–0.18 mm for light wiping, dusting and surfaces that mark easily, and 0.18–0.40 mm where residue is packed on and point pressure matters more than surface risk.
Tip treatments available on this filament: cleaning, carding, bleaching, oiling and abrasive impregnation.
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 Sisal Fiber?
Rough buffing, polishing and surface preparation of wood and metal with a firm natural fiber.
The cleaning work it is specified for most often:
- Bottle & Container Cleaning
- Cup & Mug Cleaning
- Hydration Bag Cleaning
- Laboratory Tube Cleaning
- Industrial Machine Cleaning
- Brick, Tile & Building Material Machine Brush Use
Brush types built with this fill:
- Custom Handheld Detail Brushes
- Custom Roller and Conveyor Brushes
If the sample comes back rejected: Not for wet sanitary cleaning, electronics or scratch-critical coatings.
How do I specify Sisal 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 Sisal 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 139; ISO 5079; ISO 20743; ISO 13061-1; ASTM D143.
Source: Food and Agriculture Organization of the United Nations — Hard fibres — sisal. Sisal is stiffer and coarser than tampico from the same plant family, and it is the fibre chosen when the job needs bite rather than fluid carriage. It weakens with prolonged wetting, so it is a dry- or damp-use fibre.
What else does the datasheet specify for Sisal Fiber?
| Filament cross-section | Natural Polygonal / Bundled |
|---|---|
| Electrical behaviour | Anti-Static When Wet; Insulating When Dry |
Questions this page is asked
How should sisal be tested for a repeated wet cleaner and drying cycle?
Condition complete brushes, expose them to the actual pH, concentration, temperature, dwell and mechanical load, rinse as specified and dry to a defined state before measuring mass, stiffness, recovery, strength, odor, discoloration and fibre loss. Repeat for the required cycles and reject the grade if wet performance or drying time leaves the process limits, even when the dry virgin fibre met its certificate.
Which measurements should release a sisal buffing or polishing process?
Across representative parts, control compound loading, speed, contact force, feed and dwell and measure finish, substrate removal, critical dimensions, workpiece temperature, retained or transferred compound and fibre debris. Repeat at planned brush-wear states and replace or recondition before finish, heat, shedding or cycle time leaves its acceptance band.
Where these figures come from
| Property | Published value | Source |
|---|---|---|
| Published datasheet figures |
|
Food and Agriculture Organization of the United Nations Retrieved 2026-07-20 |
| Temperature resistance | Ambient to 100°C. | Food and Agriculture Organization of the United Nations Retrieved 2026-07-20 |
| Water resistance | Absorbent fiber that carries liquid and softens slightly when wet. | Food and Agriculture Organization of the United Nations 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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