Why Ford Uses Long Glass Fiber Reinforced PP Rather Than Short Glass Fiber Reinforced PP?

- Jun 15, 2018 -

Why Ford uses long glass fiber reinforced PP rather than short glass fiber reinforced PP?

In recent years, long glass fiber modified PP has been extremely hot in the modified plastics industry. The long glass fiber reinforced PP material is low in price and has superior performance in enhancing engineering plastics. The combination of these two advantages of cost-effectiveness has been widely viewed by the industry. At present, these companies have invested a lot of manpower and material resources for the production of R & D and market development of this type of material.


What is long glass fiber modified PP? We learn step by step:

PP material

PP is one of the common plastic materials, has excellent comprehensive performance, good chemical stability, good molding processability and relatively low price; but PP exists strength, modulus, low hardness, poor resistance to low temperature impact, molding Large shrinkage, aging and other shortcomings.


Generally speaking, the tensile strength of PP material is between 20~30MPa, the bending strength is between 25~50MPa, and the flexural modulus is between 800~1500MPa. Therefore, it is modified so that it can adapt to the needs of the product. Today, every kind of modified PP has a large number of applications in the fields of household appliances and automobiles.

Long glass fiber

Glass fiber (English name: glass fiber or fiberglass) is an inorganic non-metallic material with excellent performance. Its advantages are good insulation, high heat resistance, good corrosion resistance, and high mechanical strength, but its disadvantage is brittleness and resistance. Poor grinding. One of the main uses of glass fiber is reinforced material of composite materials. Long glass fiber generally refers to glass fiber with a length of more than 10mm.

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Long glass fiber reinforced PP plastic

Long-glass-reinforced PP plastic refers to a modified PP composite with a glass fiber length of 10 to 25 mm. After injection molding, a three-dimensional structure with a glass fiber length of more than 3.1 mm is formed. In English, Long Glass Fiberpolypropylene is abbreviated as LGFPP. There is a lot of information at home and abroad that long fiber reinforced thermoplastics are referred to as LFT (Long-fiber reinforced plastic thermoplastic). From the material definition, LGFPP is a kind of LFT.


As a vehicle module carrier material, the material not only can effectively improve the rigidity, impact strength, creep resistance and dimensional stability of the product, but also can make complicated automobile module products.

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Long glass fiber reinforced PP particle morphology

It is generally cylindrical particles with a length of 12 mm or 25 mm and a diameter of about 3 mm. Among them, pellets with a length of about 12 mm are mainly used for injection molding, and pellets with a length of about 25 mm are mainly used for compression molding. In this kind of particle, the glass fiber has the same length as the particle, and the content of the glass fiber can range from 20% to 70%. The color of the particle can be matched according to the customer's requirement.

Why Ford uses long glass fiber reinforced PP rather than short glass fiber reinforced PP?

In order for the glass fiber to function well in plastics to increase strength, it is necessary to make the glass fiber length greater than its critical length Lo. Relevant data shows that when the fiber-reinforced plastic with a fiber length less than this critical length is subjected to a certain load, the fiber is pulled out and the strength of the fiber cannot be fully exerted. The critical length Lo is related to the specific plastic type. For glass fiber reinforced polypropylene, the Lo is 3.1 mm.


This shows that the failure mode is mainly because the fibers are pulled out and cannot meet the strength requirements of the module carrier material. Therefore, the development and application of long fiberglass-reinforced polypropylene and its injection molding technology require the preparation of a polypropylene fiber material with a reinforced glass fiber length of about 10 mm, and an improved injection molding process to ensure that the glass fiber length in the product is 3.1 mm. the above.

The advantages of LFT over short fiber reinforced thermoplastic composites:

• Longer fiber length significantly improves the mechanical properties of the product.


• High specific stiffness and specific strength, good impact resistance, and especially suitable for automotive parts applications.


• Improved creep resistance, good dimensional stability, and high part forming accuracy.


• Excellent fatigue resistance.


• Better stability in hot and humid environments.


• During the molding process, the fibers can move relative to each other in the forming mold and the fiber damage is small.

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Long glass fiber reinforced PP manufacturing process

There are three production processes: GMT, LFT-G, LFT-D


Long fiberglass reinforced PP applications

Automotive industry: Front-end modules, door modules, shifting mechanisms, electronic accelerator pedals, instrument panel frames, cooling fans and frames, battery trays, bumper brackets, underbody guards, sunroof frames, etc., used as an alternative to reinforced PA or metal material.

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Appliance industry: washing machine drum, washing machine triangle bracket, brush roller, air conditioning fan, etc., used to replace short glass fiber reinforced PA, ABS or metal materials.


Communications, electronics, and electrical appliances industries: high-precision connectors, igniter components, coil shafts, relay bases, microwave oven coil formers/frames, electrical connectors, solenoid valve packages, and scanner components in the communications electronics industry.


Others: Power tool housings, water pump or water meter housings, impellers, bicycle frames, skis, ground locomotive pedals, military/civil safety helmets, safety shoe covers, etc., used to replace short glass fiber reinforced PA, PPO, etc.


More details,kindly contact me.

Xiamen LFT Composite Plastic Co.,Ltd.

Mike Lee

Email : sale02@lfrtplastic.com

Mobile phone : +86-180-5026-9764

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