Glass Fiber Reinforced PP GF20 – 20% Glass Fiber Filled Polypropylene Higher Rigidity Lower Creep Structural-Grade PP

Key Attribute	Material Description	Application Value
20% Glass Fiber Reinforcement	Polypropylene reinforced with 20% short glass fiber	Delivers higher rigidity for true structural-grade PP applications
Higher Rigidity	Significantly increased modulus compared to GF15 and neat PP	Reduces flexing in load-bearing and frame-type components
Lower Creep	Improved creep resistance under long-term mechanical load	Maintains shape and fastening force over product lifetime
Dimensional Stability	Reduced shrinkage and thermal deformation vs. unfilled PP	Supports tighter tolerances in larger or rib-intensive parts
Cost & Processing Balance	Balanced reinforcement level with stable injection molding behavior	Cost-effective structural solution for high-volume production

YongJinHong Product Lineup

Contact Us

Start Your Project

Quick Summary: Glass Fiber Reinforced PP GF20 is a structural-grade polypropylene containing 20% glass fiber reinforcement. Compared with GF15, it delivers higher stiffness, improved creep resistance, and better load-bearing capability while maintaining PP’s lightweight nature and chemical stability. It is designed for components that experience continuous mechanical stress or require tighter dimensional control.

Glass Fiber Reinforced PP GF20

20% Glass Fiber Reinforced Polypropylene for Higher Structural Demands

PP GF20 is developed for applications where PP GF15 reaches its mechanical limit. By increasing the glass fiber content to 20%, this grade significantly enhances rigidity, creep resistance, and long-term dimensional stability, making it suitable for parts exposed to continuous load, thermal cycling, or assembly stress.

Compared with PP GF15, GF20 sacrifices a small amount of toughness in exchange for more predictable structural behavior. Compared with nylon-based materials, PP GF20 still maintains advantages in weight reduction, moisture resistance, and chemical stability.

Material Composition & Reinforcement Strategy

PP GF20 is compounded with a higher concentration of short glass fibers, forming a more rigid internal framework within the polypropylene matrix. This structure limits molecular chain movement under load, resulting in improved resistance to deformation over time.

Material Composition Overview

Base Polymer: Polypropylene (PP)
Glass Fiber Content: 20% chopped glass fiber
Fiber Type: E-glass
Optional Additives:
- Heat stabilizer
- UV stabilizer
- Anti-aging additives
- Processing aids
Color Options: Natural, black, customized

This formulation shifts PP from a “light structural material” toward a true semi-structural engineering plastic.

Core Advantages: Rigidity, Creep Control & Stability

Engineering Advantages

Higher Structural Rigidity

20% glass fiber content delivers a noticeable increase in flexural modulus compared to GF15.

Improved Creep Resistance

Better performance under long-term static load, especially in warm environments.

Enhanced Dimensional Control

Lower deformation after molding and during service life.

Excellent Chemical Resistance

Maintains PP’s resistance to acids, alkalis, detergents, and automotive fluids.

Low Moisture Sensitivity

Mechanical properties remain stable in humid or wet environments.

Manufacturing & Commercial Advantages

Designed for Load-Bearing PP Parts

Suitable when unfilled PP or GF15 shows deformation during use.

Predictable Performance in Mass Production

More consistent part geometry across production batches.

Cost-Controlled Alternative to Nylon

Offers sufficient stiffness without the weight and moisture issues of PA materials.

Reduced Wall Thickness Potential

Higher stiffness allows thinner designs in certain structures.

Typical Application Areas

Automotive Applications

Structural brackets
Battery module supports
Underbody covers with load requirement

Home Appliances

Internal frames
Load-bearing supports
Structural reinforcement parts

Industrial Equipment

Equipment housings
Mechanical support components
Structural plastic frames

Processing Performance & Injection Molding Guidelines

Typical Processing Parameters

Melt Temperature: 210–250°C
Mold Temperature: 40–70°C
Drying: Not required under normal storage
Injection Speed: Medium
Shrinkage: 0.4–0.7% (directional)

Proper gate design and flow direction control help optimize fiber orientation.

OEM / ODM Customization Capabilities

Customization Options

Glass fiber content: GF15 / GF20 / GF25
UV-resistant outdoor grades
Heat-stabilized formulations
Improved surface appearance grades
Color customization

OEM Support Services

Structural performance evaluation
Material selection comparison (GF15 vs GF20)
Prototype sampling
Long-term supply assurance

Technical Specification – PP GF20

Property	Test Standard	Typical Value
Density	ISO 1183	1.10–1.15 g/cm³
Tensile Strength	ISO 527	65–80 MPa
Flexural Strength	ISO 178	95–120 MPa
Flexural Modulus	ISO 178	4,200–5,200 MPa
Notched Izod Impact	ISO 180	3–5 kJ/m²
Heat Deflection Temp.	ISO 75	140–160°C
Shrinkage	—	0.4–0.7%
Chemical Resistance	—	Excellent

FAQ

Q1: Why choose PP GF20 instead of PP GF15?
When higher stiffness and better creep resistance are required under long-term load.

Q2: Does PP GF20 replace nylon materials?
In many medium-load applications, yes—especially where moisture resistance and weight reduction matter.

Q3: Is PP GF20 suitable for large parts?
Yes, particularly for large components that need better shape retention than GF15.

Q4: Does higher glass fiber reduce impact strength?
Slightly, but the trade-off improves structural predictability and stability.

Q5: Can PP GF20 be customized?
Yes. Fiber content, UV resistance, heat stability, and color can be adjusted.

Field Insight: PP GF20 is typically selected when designers need more structural confidence than GF15 can provide, but want to avoid the weight, moisture sensitivity, and cost of nylon-based materials.