Executive Conclusion 

• GF15 → Precision upgrade over standard POM, moderate stiffness

• GF20 → Structural reliability zone for continuous load

• GF25 → High-rigidity structural grade with minimal deformation

• GF30 → Structural ceiling of POM, near-zero deformation tolerance

⚠️ Most stable long-term designs fall between GF20 and GF25.
GF30 should be selected only when deformation tolerance is extremely tight.

Structural Performance Comparison 

“Higher GF” Is Often the Wrong Decision in POM

 Common Engineering Mistakes

• Jumping from standard POM directly to GF30

• Using glass fiber to compensate for poor part geometry

• Ignoring creep direction and fiber orientation

 Correct Engineering Questions

• Is deformation elastic or time-dependent?

• Is the load continuous or intermittent?

• Is rigidity the real issue, or alignment design?

In many POM applications, GF20 solves the problem more cleanly than GF30.

Application-Driven Selection Logic

Automotive & Mobility

• Interior mechanisms / brackets → GF15

• Load-bearing interior structures → GF20

• Structural carriers near heat/vibration → GF25

• Alignment-critical structural parts → GF30

Industrial Equipment

• Precision housings → GF15 / GF20

• Continuous load supports → GF20

• Structural frames & supports → GF25

• Zero-drift alignment components → GF30

Mechanical & Electrical Assemblies

• Light structural elements → GF15

• Geometry-stable mechanisms → GF20

• Load-critical precision assemblies → GF25

• Structural accuracy-defining parts → GF30

Engineering Selection Flow 

Step 1 – Is the part under continuous mechanical load?

• No → GF15

• Yes → Step 2

Step 2 – Is long-term creep a concern?

• Moderate → GF20

• Critical → Step 3

Step 3 – Is any deformation acceptable?

• Minimal → GF25

• Essentially zero → GF30

GF30 Is Not a “Safe Default” in POM

• Very high anisotropy

• Narrow molding window

• High mold wear

• Reduced impact tolerance

GF30 is a commitment, not a safety margin.

Typical Mechanical Property Ranges