PA6/66/610/612, PBT, and PP Wear Resistance Empirical Test:
Who is the True "King of Abrasion Resistance"?
When selecting wear-resistant bristles, the biggest pitfall is "blind selection." Today, we cut straight to the data. We put the 6 mainstream bristle materials on the market into the same testing arena to see who truly claims the throne of wear resistance.
📏 I. The Testing Benchmark
Referencing industry-standard abrasive testing methodologies: We utilized standard twisted-in-wire brushes filled with 0.3mm diameter bristles, rotating at a fixed RPM against abrasive sandpaper. The wear rate is evaluated by the weight limit/mass loss per unit of time (mg/h). (Note: A lower value indicates superior wear resistance.)
📊 II. The 6-Material Wear Resistance Tier List
① PA612
★★★★★
Wear Rate: Lowest (Best)
- ✔️ Pros: Low water absorption, ultra-high toughness, unmatched fatigue resistance.
- ❌ Cons: Highest price point.
- 🎯 Apps: Premium toothbrushes, precision polishing brushes.
② PA610
★★★★☆
Wear Rate: Very Low
- ✔️ Pros: Low moisture absorption, strong alkali resistance, excellent wear.
- ❌ Cons: Slightly inferior to PA612.
- 🎯 Apps: Medical-grade brushes, fruit & vegetable cleaning brushes.
③ PA66
★★★★
Wear Rate: Low
- ✔️ Pros: High-temp resistance, solid bend recovery, highly cost-effective.
- ❌ Cons: Dimensional shifts after water absorption.
- 🎯 Apps: Industrial abrasive brushes, electric toothbrushes.
④ PBT
★★★☆
Wear Rate: Medium-Low
- ✔️ Pros: Extremely low water absorption (0.1%), superb chemical resistance.
- ❌ Cons: Wear resistance slightly below Nylon (PA).
- 🎯 Apps: Daily cleaning brushes, makeup cosmetic brushes.
⑤ PA6
★★★
Wear Rate: Medium
- ✔️ Pros: Low production cost, highly easy to process.
- ❌ Cons: High absorption (3.5%), poor wear performance in wet states.
- 🎯 Apps: General-purpose industrial brushes.
⑥ PP
★★
Wear Rate: Higher
- ✔️ Pros: The cheapest option, resists strong acids/alkalis, lightweight.
- ❌ Cons: Poor elasticity, prone to aging and flattening (matting).
- 🎯 Apps: Street sweeper brushes, heavy sanitation, disposable brushes.
💡 III. Deep-Dive Analytical Findings
Finding 1: Long-chain Nylons (PA610/612) Dominate in Wet Environments
PA66 performs well in dry conditions, but at 80% relative humidity, its wear rate violently spikes from 3.2 to 5.8 (×10⁻⁶ mm³/N·m). PA612, on the other hand, barely flinches, shifting merely from 2.7 to 3.1. Takeaway: If your brush operates in wet, oily, or outdoor environments, PA610/612 is the safest bet.
Finding 2: PBT is the Goldilocks Zone for "Moisture & Wear"
With a minuscule water absorption rate of 0.1%, PBT offers superior dimensional stability and wear consistency over PA6/66 in humid scenarios like bathrooms, kitchens, and food processing. While its absolute wear resistance can't dethrone PA612, it costs only 60%-70% as much, making its ROI incredibly compelling.
Finding 3: PP Isn't Bad—It Just Needs the Right Application
PP boasts a density of 0.90-0.92g/cm³ (it floats in water), resists harsh acids/alkalis, and has the absolute lowest cost. For applications defined by "large diameters, low RPMs, heavy loads, and short lifespans"—such as street sweepers or snow plows—PP is dramatically more cost-effective than Nylon.
IV. The 1-Sentence Selection Guide
- 🚀 Top Tier Budget & Extreme Requirements
👉 PA612 - ⚖️ Wear + Moisture Protection + Cost Control
👉 PA610 or PA66 - 💧 Wet Environment + Medium Lifespan
👉 PBT - 🔨 Low Cost + Heavy-Duty / Rough Work
👉 PP
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