Material
PU Foam
PU Foam is selected from 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.
Material Overview
Polyurethane foam is an open- or closed-cell cellular material whose density, hardness and hydrolysis behavior vary widely by formulation.
In a finished brush, PU Foam does not create a fixed stiffness by itself. Contact performance comes from the filament geometry and installed setting; grade, moisture, heat, and chemistry determine how it performs over time.
Material Properties
| Density | 20–200 kg/m³ |
|---|---|
| Hardness | 10–80 Shore 00 |
| Use temperature | -30–100°C |
| Compression set | 5–25% by grade |
| Cell structure | open or closed cell |
Brush Applications
For PU Foam, directly related brush structures include Disc Brushes. Applications related to PU Foam include Industrial Machine Cleaning, Dust Removal, and CNC Machine Chip Cleaning.
Specification and Customization
Material form
Foam Head / Pad
Common forms
Foam head/pad.
Grade
Flexible foam grade; density specified separately
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 Foam brush material?
Polyurethane foam is an open- or closed-cell cellular material whose density, hardness and hydrolysis behavior vary widely by formulation. Direct data: Density: 20–200 kg/m³; Hardness: 10–80 Shore 00; Use temperature: -30–100°C; Compression set: 5–25% by grade; Cell structure: open or closed cell.
Where is PU Foam used in cleaning brushes?
Compliant wiping, coating and cushioning contact where cell structure and compression recovery can be specified.
How does filament geometry change PU Foam brush stiffness?
PU Foam 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 Foam be replaced by another material?
Compare PU Foam 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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