What is PP GF30?

LFT-G^® NG03 PP GF30 is a high-performance polypropylene (PP) composite, technically defined as a Long Glass Fiber Thermoplastic (LFT) reinforced with 30% glass fiber content (LGF30). Produced via a proprietary pultrusion process, this material ensures that continuous E-glass fibers are fully encapsulated within a high-flow polypropylene matrix, resulting in pellets where the fiber length is maintained. This core characteristic-the preservation of long fibers-is what elevates its performance far beyond that of conventional short glass fiber (SGF) reinforced plastics, often labeled simply as "GF30."

LFT-G^® NG03 PP GF30 is a high-performance Long Glass Fiber (LGF) reinforced polypropylene engineered for applications demanding superior toughness and reliability. It delivers:

Maximum Impact Resistance: Offers exceptional energy absorption, making it ideal for components exposed to drops, impacts, and vibration.
Excellent Strength & Durability: Provides a robust structural foundation with outstanding long-term fatigue and creep resistance.
Superior Surface Finish: The lower fiber content allows for a more resin-rich surface, resulting in a high-quality aesthetic appearance.

When this 30% long glass filled polypropylene is injection molded, the fibers interlock to form a robust internal structural network. This "fiber skeleton" is the key to its exceptional ability to absorb and dissipate energy, leading to vastly superior impact strength and toughness. The NG03 grade is specifically formulated to provide the best balance between extreme durability and ease of processing, making it a highly versatile and cost-effective material for a wide range of structural and semi-structural applications where resilience is paramount.

Technical Specifications & Performance Data

Trust in data. The specifications below represent typical values for our LFT-G^® PP LGF30 (NG03) grade, a testament to its reliable and consistent performance. All data is generated from injection-molded test specimens according to ISO standards, providing engineers with the accurate information needed for design and analysis.

Material Properties (Model: LFT-G^® NG03 PP GF30)

Property	Value	Unit	Test Method
Density	1.12	g/cm³	ISO 1183
Tensile Strength	115	MPa	ISO 527
Flexural Modulus	5,400	MPa	ISO 178
Notched Izod Impact Strength	38	kJ/m²	ISO 180
Heat Deflection Temperature (1.8 MPa)	158	°C	ISO 75

Download Complete NG03-PP GF30 Data Sheet PDF

Design & Processing Guidelines

To achieve optimal results with LFT-G^® PP LGF40, careful consideration during the design and molding stages is crucial. Our technical service team offers comprehensive support, but here are some fundamental guidelines for your engineering team:

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①Drying Time	2-4 hours
Drying Temperature	80-100°C
② Temperature Zone (Melt)	210-250°C
③Mold Temperature	40-80°C

Material Handling: While Polypropylene has low moisture absorption, pre-drying for 3–4 hours at 80-100°C (176-212°F) is recommended to remove any surface moisture, which ensures a high-quality surface finish and prevents splay.
Tooling & Machine: Use a general-purpose screw with a low compression ratio (e.g., 2:1) and a free-flowing nozzle and check ring assembly to minimize shear and preserve fiber length. Molds should be made from high-quality tool steel to withstand long production runs.
Part Design for LFT: Maintain generous radii on all internal and external corners (minimum 2mm) to facilitate smooth polymer flow and avoid creating stress concentration points. Strive for a uniform wall thickness across the part; where changes are needed, make them gradual and tapered.
Gating Strategy: The placement and type of gate are critical for LFT performance. Use large, simple gates like tab or direct sprue gates. Position them in non-critical areas and in a way that allows the melt to flow along the part's primary load path, which helps align the fibers for maximum strength in that direction.

A durable stadium seat molded from impact-resistant LFT-G PP GF30.

Image 2: Public seating, like stadium seats, requires the outstanding impact resistance and weatherability that LFT-G^® PP LGF30 provides.

Proven Applications & Case Studies

The LFT-G^® PP LGF30 grade is a trusted material for creating durable goods that need to withstand the test of time and tough environments. Its unique ability to absorb impacts without catastrophic failure makes it a preferred choice for components in the automotive, appliance, and sporting goods industries.

An automotive fan shroud made from LFT-G PP LGF30, showing complex geometry and snap-fit features. — Fan shrouds require thermal stability and impact resistance from road debris.

Case Study: Automotive Fan Shroud Assembly

The Challenge: An automotive cooling systems manufacturer needed a material for a large, complex fan shroud. The material had to withstand constant engine bay temperatures, resist vibration from the fan, and survive impacts from road debris. The previous short fiber material showed stress cracking over time near the mounting bosses.

The Solution: The LFT-G^® NG03 PP GF30 grade was selected. Its long fiber structure provided superior resistance to fatigue and vibration, eliminating the stress cracking issue. The material's inherent toughness easily handled impacts from stones and other road hazards, while its thermal stability ensured it would not warp or deform from engine heat.

Michael said: "The key to this application's success was not just raw strength, but long-term reliability. The long fiber network is incredibly effective at resisting crack propagation. So even if a micro-crack forms from an impact, the long fibers bridge the gap and prevent it from growing into a full-blown failure. This is a level of 'damage tolerance' that short fiber materials simply cannot match, leading to a much longer service life for the part.", the automotive engineer from famous structure technical study part.

The Result: The new LFT-PP LGF30 shroud passed all OEM durability tests, including long-term thermal aging and vibration profiles, with a 100% success rate. Warranty claims related to cracked shrouds were eliminated, and the material's excellent flow characteristics also allowed for a 10% reduction in cycle time compared to the previous, more viscous short fiber compound.

Case Study: Front Panel of a Home Appliance

The Challenge: A manufacturer of high-end dishwashers and washing machines required a material for their large front control panel. The part needed a Class-A surface finish, perfect color matching, and the ability to withstand accidental impacts from users in a kitchen environment without chipping or cracking. It also needed to be dimensionally stable to ensure a perfect fit with adjacent parts.

The Solution: LFT-G^® PP LGF30 was chosen over a competing short fiber ABS material. The 30% long glass fiber content provided the necessary stiffness and dimensional stability, while being low enough to allow for a beautiful, resin-rich surface with minimal fiber readout. Its impact strength was far superior to the brittle ABS.

"For consumer-facing parts, aesthetics are just as important as mechanics. We worked with the molder to optimize the tool temperature and injection speed. This allows the polymer to fully replicate the polished mold surface before the fiber network freezes in place. The result is a part that has the strength of a structural composite but the appearance of a high-end cosmetic plastic. This dual capability is a unique advantage of our LFT-PP GF30 grade.", Daniel has the insight, from the plastic engineer.

The Result: The LFT-PP LGF30 panel not only met all structural and impact requirements but also exceeded the aesthetic expectations of the industrial design team. The lower density of polypropylene compared to ABS also resulted in a 15% weight reduction, contributing to lower shipping costs and easier handling during assembly.

Frequently Asked Questions (FAQ)

Q: What is the main advantage of LGF30 compared to unreinforced Polypropylene?

A: The addition of 30% long glass fiber transforms polypropylene from a general-purpose plastic into a true engineering material. Compared to unfilled PP, LFT-PP LGF30 offers a dramatic increase in strength (typically 3-4x), stiffness (4-5x), dimensional stability, and a significantly higher heat deflection temperature. This allows it to be used in structural, load-bearing applications where unfilled PP would fail.

Q: Is PP LGF30 suitable for snap-fit designs?

A: Yes, it is an excellent choice for snap-fit designs. The inherent flexibility and toughness of the polypropylene matrix, combined with the strength from the long glass fibers, allows for robust snap-fit features that can be assembled and disassembled multiple times without breaking. The material's ductility prevents the "brittle failure" often seen in more rigid, short-fiber plastics.

Q: How does the cost of PP LGF30 compare to other LFT materials like PA6 LGF30?

A: LFT-PP LGF30 is generally more cost-effective than LFT-PA6 LGF30 (Nylon). Polypropylene is a lower-cost base resin than Polyamide 6. While PA6 offers higher thermal performance, PP provides better chemical resistance and lower moisture absorption. For applications where extreme heat is not a factor, LFT-PP LGF30 provides a fantastic performance-to-cost ratio, making it an ideal choice for a wide range of industrial and consumer products.

Build More Durable Products with LFT-G^®

Leverage the superior toughness and balanced performance of LFT-G^® PP LGF30 to create products that last. Our engineering team is ready to help you with material selection, design optimization, and processing support. Contact us to start your next project.

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