The Achilles' Heel of Traditional Nylon
For a long time, the encapsulation material of shower room rollers has mostly used nylon (PA66). Although wear-resistant, it has a fatal flaw: high water absorption rate.
In high-humidity environments like bathrooms, PA66 gradually absorbs moisture and expands slightly in volume. This causes the gap between the roller and the track to shrink, and the sliding feel becomes increasingly 'sticky' over time.
POK: The Super Engineering Plastic of the Future
MFMK, in collaboration with material laboratories, has comprehensively introduced POK (Polyketone) material.
1. Zero Water Absorption
The water absorption rate of POK is only 1/10 of PA66. Whether in humid southern weather or dry northern winters, the roller dimensions always maintain a stability of ±0.01mm.
2. Wear Resistance Increased by 300%
According to MFMK laboratory data (Test No. LAB-2024-092), under a 50kg load for 100,000 reciprocating friction tests, the wear amount of POK rollers is only 0.02g, while PA66 is 0.08g.
3. Chemical Stability
Shower rooms often come into contact with shampoo, shower gel, and acidic cleaners. POK has strong inertness to acids and alkalis and will not become brittle like nylon.
✅ Conclusion: Although the raw material cost of POK is 40% higher than PA66, this is a choice MFMK must make to ensure the promise of a 15-year warranty.
