Material
PBT
PBT 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
PBT is a semicrystalline thermoplastic polyester with low moisture uptake, dimensional stability and grade-dependent chemical and thermal behavior.
In a finished brush, PBT 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 | 1.30–1.32 g/cm³ |
|---|---|
| Melting point | 223–230°C |
| Water absorption | 0.1–0.2% |
| Shore hardness | D 80–85 |
| Filament diameter | 0.08–1.50 mm |
Brush Applications
For PBT, directly related brush structures include Handheld Detail Brushes, Tube & Pipe Bore Brushes, Roller and Conveyor Brushes, and Strip Seal Brushes. Applications related to PBT include Laboratory Tube Cleaning, CPAP Hose Cleaning, Household Dish, Teapot & Kitchen Detail Cleaning, and Beverage Equipment Cleaning.
Specification and Customization
Material form
Filament
Common forms
Filament; strip fill; tube fill.
Grade
Standard wet-stiffness brush-filament 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 heavy rust removal or high-cutting deburring.
Frequently Asked Questions
What are the key properties of PBT brush material?
PBT is a semicrystalline thermoplastic polyester with low moisture uptake, dimensional stability and grade-dependent chemical and thermal behavior. Direct data: Density: 1.30–1.32 g/cm³; Melting point: 223–230°C; Water absorption: 0.1–0.2%; Shore hardness: D 80–85; Filament diameter: 0.08–1.50 mm.
Where is PBT used in cleaning brushes?
Bottle, appliance, electronics and wet-cleaning brushes that need stable stiffness after repeated water exposure.
How does filament geometry change PBT brush stiffness?
PBT 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 PBT be replaced by another material?
Compare PBT with Nylon, PP, PET. Change material when wet stiffness, temperature, chemical resistance, conductivity, particle shedding, or surface marking becomes the limiting factor.
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