PP CP323
Modified PP Black CP323
General purpose black modified polypropylene balancing stiffness and flow, suitable for a wide range of injection moulded structural parts.
Request Data Sheet & Quote →Cross-Flow Fan Wheels: Why Glass-Reinforced PP Rather Than PP-TD
Rotating parts need creep resistance and dynamic balance — mineral-filled PP cannot deliver, glass fibre is mandatory.
What rotation demands
Cross-flow fan wheels run at high continuous speed with sustained centrifugal load and slight vibration, usually in warm humid air. That calls for long-term creep resistance, low water uptake and dimensional stability.
Mineral-filled PP has adequate stiffness but poor creep resistance: blade angles drift slowly during service, destroying dynamic balance and raising noise.
How PP-GF performs
PP with 20-30% short glass fibre reaches 3,000-4,500 MPa flexural modulus and far better creep resistance than mineral-filled systems, while keeping PP's low density and low water absorption.
It is normally paired with rotor balancing practice: uniform fibre dispersion first to reduce inertia variation, then balance correction after assembly.
Why not PA-GF
PA6-GF30 is stronger and more heat resistant, but absorbs around 3% water, changing dimensions and stiffness — a risk in humid rotating parts.
That is why low-absorption reinforced PP dominates in appliance fan wheels.
Published 2026-06-30 · Product Gallery · Selection guidance only; refer to agreed technical documents for release data.
Related Grades
PP GP-1435
Modified Polypropylene Cold Grey GP-1435
Modified polypropylene for both extrusion and injection, with low-temperature resistance, high strength and dimensional stability.
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PP-TD20
Automotive Grade PP-TD20 (CP323)
20% talc filled polypropylene with improved stiffness and heat resistance and stable shrinkage, for automotive interior and structural parts.
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