Material
PU Sponge
PU Sponge is selected from its stiffness, recovery, wear, wet-service, chemical, and temperature behavior. For a usable stiffness specification, provide the material, filament diameter, free trim, density, grade, and operating conditions.
Material Overview
Polyurethane sponge is a cellular elastomeric material available in ether- and ester-based chemistries with different water, microbe and solvent responses.
In a finished brush, PU Sponge does not create a fixed stiffness by itself. Contact force and recovery depend on filament diameter, free trim, density, tuft pattern, and installed interference. Grade, moisture, temperature, and chemistry affect how that behavior changes in service.
Material Properties
| Density | 20–120 kg/m³ |
|---|---|
| Pore size | 100–1,000 µm |
| Hardness | 10–70 Shore 00 |
| Use temperature | -20–90°C |
| Water uptake | open-cell grades absorb freely |
Brush Applications
For PU Sponge, directly related brush structures include Handheld Detail Brushes, Roller and Conveyor Brushes, and Tube & Pipe Bore Brushes. Applications related to PU Sponge include Bottle & Container Cleaning, Cup & Mug Cleaning, Hydration Bag Cleaning, and Laboratory Tube Cleaning.
Specification and Customization
Material form
Porous Sponge / Roller
Common forms
Sponge head; foam roller.
Grade
Open-cell or reticulated sponge grade
Reference standard
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
Limitations and Alternatives
Not for strong solvents or abrasive surface finishing without grade data.
Frequently Asked Questions
What are the key properties of PU Sponge brush material?
Polyurethane sponge is a cellular elastomeric material available in ether- and ester-based chemistries with different water, microbe and solvent responses. Direct data: Density: 20–120 kg/m³; Pore size: 100–1,000 µm; Hardness: 10–70 Shore 00; Use temperature: -20–90°C; Water uptake: open-cell grades absorb freely.
Where is PU Sponge used in cleaning brushes?
Wiping, coating, liquid metering and drying rollers selected by pore size, density and wet recovery.
How does filament geometry change PU Sponge brush stiffness?
PU Sponge 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.
When should PU Sponge be replaced by another material?
Compare PU Sponge with PVA, PVC sponge, PP sponge. Change material when wet stiffness, temperature, chemical resistance, conductivity, particle shedding, or surface marking becomes the limiting factor.
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