What Are the Differences Between High-Density and Low-Density PBT Bristles?

🔧 Test 1: Wear Resistance

Method: Reciprocating friction under 1000g load for 10,000 cycles. Measure the amount of wear.

Result: High-density: 0.23 mg wear | Low-density: 0.61 mg wear

💡 Conclusion: High-density bristles are 2.65 times more wear-resistant than low-density ones [1].

🔄 Test 2: Elastic Recovery

Method: Bend 90 degrees and hold for 1 hour. Measure the residual angle after 5 seconds.

Result: High-density: Fully recovered | Low-density: ~8° residual

💡 Conclusion: High-density bristles recover more quickly and completely than low-density bristles [1].

⚠️ Test 3: Flex Fatigue

Method: Repeat bending at 60°, 2Hz. Record the number of cycles until the bristle breaks.

Result: High-density: >150,000 cycles (no break) | Low-density: ~72,000 cycles

💡 Conclusion: High-density bristles have over 2 times more fatigue life than low-density bristles [1].

🧩 Test 4: Feel & Cost

• Feel: High-density: firm, tactile, with structure | Low-density: soft, lacks support
• Cost: High-density raw material cost is about 2–3% higher, but lifespan is increased several times → extremely high cost-performance ratio