YongJinHong POM GF25 Exists (Engineering Positioning)
POM GF25 is selected when GF20 begins to show measurable deformation under sustained load, or when design tolerances leave no room for elastic drift.
At 25% glass fiber content, POM transitions from reinforced precision plastic to a true structural engineering material, where rigidity and shape retention outweigh toughness and processing ease.
GF25 is chosen when reliability margins matter more than impact softness or wide processing windows.
Material Composition & Reinforcement Strategy
Material Overview
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Base Polymer: Polyoxymethylene (POM / Acetal)
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Glass Fiber Content: 25%
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Reinforcement Type: Short glass fiber
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Optional Additives:
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Heat stabilizers
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Processing lubricants
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Impact modifiers (limited)
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UV stabilizers
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Color Options: Natural, black, customized
This formulation prioritizes structural rigidity and deformation control over toughness balance.
Core Performance Advantages
Engineering Advantages
High Structural Stiffness
Substantially higher flexural modulus than GF20, limiting bending and torsion.
Excellent Creep Resistance
Maintains geometry under long-term static and dynamic loads.
Minimal Dimensional Drift
Very stable shape retention across service life.
Low Moisture Sensitivity
Dimensional accuracy unaffected by humidity or water exposure.
Chemical Resistance
Resistant to fuels, oils, greases, and industrial cleaning agents.
Manufacturing & Production Advantages
Predictable Structural Performance
Consistent rigidity and deformation control across batches.
Designed for Load-Critical Parts
Ideal where geometry deviation leads to functional failure.
Acceptable Processing with Engineering Discipline
Narrower window than GF20, but stable with proper mold design.
Long-Term Production Stability
Well-suited for serial production of structural components.
Typical Application Areas
Automotive Applications
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Structural carriers
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Precision brackets under sustained load
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Components near heat and vibration sources
Industrial Equipment
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Structural frames
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Support elements under constant mechanical stress
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Alignment-critical housings
Mechanical & Electrical Assemblies
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Structural elements with tight tolerances
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Components where deformation affects system accuracy
Structural supports 
Precision alignment components 
Electrical Assemblies
Processing Guidelines (Injection Molding)
Typical Processing Parameters
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Melt Temperature: 200–225 °C
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Mold Temperature: 90–120 °C
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Drying: 80 °C for 2–4 hours
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Injection Speed: Medium
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Shrinkage: ~1.2–1.6% (directional)
Fiber orientation significantly influences mechanical behavior and must be considered during mold design.
OEM / Customization Capabilities
Customization Options
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Heat-stabilized grades for elevated temperatures
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Optimized creep-resistant formulations
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Limited impact-balanced versions
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Color customization
OEM Support
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GF20 vs GF25 vs GF30 selection guidance
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Load and deformation simulation support
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Prototype sampling and validation
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Long-term supply assurance
Typical Technical Data (Reference Values)
| Property | Test Standard | Typical Value |
|---|---|---|
| Density | ISO 1183 | 1.50–1.55 g/cm³ |
| Tensile Strength | ISO 527 | 80–100 MPa |
| Flexural Strength | ISO 178 | 120–150 MPa |
| Flexural Modulus | ISO 178 | 5,800–7,200 MPa |
| Notched Izod Impact | ISO 180 | 3–5 kJ/m² |
| Heat Deflection Temp. | ISO 75 | 165–180 °C |
| Moisture Absorption | — | Very Low |
FAQ
Q1: When should POM GF25 be selected instead of GF20?
When parts are under continuous load and GF20 shows measurable long-term deformation.
Q2: How does GF25 differ from GF30?
GF25 balances high rigidity with manageable processing, while GF30 prioritizes maximum stiffness.
Q3: Is POM GF25 suitable for moving parts?
It is best for static or lightly moving structural components.
Q4: Does GF25 significantly increase mold wear?
Yes, more than GF20. Hardened tooling is recommended.
Q5: Can POM GF25 replace metal parts?
Yes, in many moderate-to-high load applications requiring weight reduction and corrosion resistance.
