PP GF20 (LGF 20%) Composite

What is PP GF20?

LFT-G^® NG02 PP GF20 is a specialized polypropylene (PP) composite, technically defined as a Long Glass Fiber Thermoplastic (LFT) reinforced with a 20% glass fiber content (LGF20). This advanced material is created using a pultrusion process that fully impregnates continuous glass fibers with a polypropylene matrix, ensuring the integrity and length of the fibers are maintained within each pellet. While often searched for under the general term "PP GF20," the "LGF" (Long Glass Fiber) technology is the key differentiator that provides a significant leap in performance over conventional short fiber reinforced plastics.

During injection molding, this 20% long glass filled polypropylene forms an intricate, interlocking fiber network throughout the part. This internal skeleton is exceptionally effective at absorbing and dissipating impact energy, which is why LFT-PP LGF20 exhibits toughness and resistance to failure far superior to materials with higher fiber loadings or short fibers. The NG02 grade is specifically engineered to maximize these toughness characteristics while also providing excellent melt flow for enhanced manufacturing flexibility, making it an ideal, cost-effective choice for large or complex parts where durability and appearance are critical design criteria.

Technical Specifications & Performance Data

Informed engineering decisions rely on precise data. The specifications below are typical, industry-referenced values for our LFT-G^® PP LGF20 (NG02) grade. This data showcases a performance profile optimized for impact resistance and high-quality manufacturing. All tests are conducted on injection-molded specimens according to ISO standards.

Material Properties (Model: LFT-G^® NG02 PP GF20)

Download Complete NG02-PP GF20 Data Sheet PDF

Design & Processing Guidelines

To achieve optimal results with LFT-G^® PP LGF20, 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:

• 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.

Proven Applications & Case Studies

LFT-G^® PP LGF20 is the material of choice for designers and engineers who refuse to compromise on toughness or appearance. Its unique capabilities make it ideal for producing high-quality consumer goods, functional automotive components, and durable industrial parts where both performance and aesthetics drive value.

Case1: Ergonomic Office Chair Base and Armrests

The Challenge: A leading office furniture manufacturer aimed to create a new flagship chair that was both aesthetically pleasing and exceptionally durable. The five-star base and armrests needed to pass stringent BIFMA cyclic load and impact tests, while also featuring a flawless, Class-A surface finish that would not require painting.

The Solution: After evaluating several materials, LFT-G^® NG02 PP GF20 was selected. Its excellent flow characteristics allowed the large, complex chair base to be molded without defects, while the low fiber content resulted in a smooth, high-gloss finish. The material's high impact strength and fatigue resistance ensured it could withstand years of daily use, from heavy impacts to constant loads.

"For a product like a chair, perceived quality is everything. The challenge was to achieve structural integrity without any visual imperfections. We advised a specific mold texturing and optimized the injection profile to control the fiber orientation at the surface. This ensured that the long fiber network was doing its structural work on the inside, while the outside remained perfectly smooth. It's a synergy of mechanics and aesthetics that defines this material grade." Ryler Maler said, the home appliance structure engineer.

The Result: The LFT-PP LGF20 components passed all BIFMA durability tests with a significant safety margin. The direct-from-mold finish was so high-quality that it eliminated the need for painting, saving 15% on total part cost and removing a volatile organic compound (VOC) from the manufacturing process, contributing to the client's sustainability goals.

Case2: Kayak Seat and Rudder Components

The Challenge: A manufacturer of high-performance kayaks needed a material for their adjustable seat and rudder system. The material had to be completely resistant to fresh and saltwater, withstand constant UV exposure, and endure high impacts from paddles, rocks, and transport without cracking.

The Solution: A UV-stabilized grade of LFT-G^® PP LGF20 was specified. The polypropylene matrix is inherently hydrophobic and chemically resistant, making it impervious to water damage. The long glass fiber structure provided the toughness needed to handle the rough-and-tumble use case of kayaking, absorbing impacts that would shatter more brittle plastics.

Alina has her insight: "In sporting goods, failure is not an option. We focused on 'damage tolerance.' A kayak part will inevitably get scratched and gouged. With LFT, the long fiber network acts to arrest the growth of these scratches into critical cracks. This means the part maintains its structural integrity even after accumulating surface damage. This reliability and user safety in extreme conditions is a core benefit we engineer into the material."

The Result: The LFT-PP LGF20 components proved to be virtually indestructible in field testing. The material's light weight also helped reduce the kayak's overall mass, making it easier for users to carry. The project was a success, leading to a reduction in warranty claims for broken parts by over 90%.

Frequently Asked Questions (FAQ)