PP LGF20 Technical Data
LFT-G® PP LGF20 is a 20% long glass fiber reinforced polypropylene (homopolymer), engineered for lightweight structural parts that upgrade short-fiber PP and replace heavier ABS and nylon.
| Property | Specification |
|---|---|
| Product Grade | LFT-G® PP LGF20 |
| Material Type | Long Glass Fiber Reinforced Thermoplastic (LFT) |
| Polymer Matrix | Polypropylene (Homopolymer, HPP) |
| Glass Fiber Content | 20% |
| Available Color | Black / Natural |
| Form | Pellets (Length 10–12mm, customizable 6–25mm) |
Typical Material Properties of PP LGF20
| Property | Value | Standard |
|---|---|---|
| Density | 1.05 g/cm³ | ASTM D-792 |
| Molding Shrinkage | 0.2–0.4% | ASTM D-955 |
| Tensile Strength | 103 MPa | ISO 527 |
| Tensile Modulus | 5,365 MPa | ISO 527 |
| Tensile Elongation | 2.2–3.3% | ISO 527 |
| Flexural Strength | 128 MPa | ASTM D-790 |
| Flexural Modulus | 3,693 MPa | ASTM D-790 |
| Notched Charpy Impact | 29 kJ/m² | ISO 180 |
| HDT (1.8 MPa) | 156 °C | ISO 75-2 |
| Flame Retardant | HB @ 1.5 mm | UL-94 |
Typical values are based on limited laboratory test specimens and are provided for reference only. They are not intended as specification limits. Actual molded-part performance can vary with test conditions, specimen preparation, processing conditions, part design and production batch. Source: official TDS LFT-G® PP-LGF20-NG02-2 (Revised 30/06/2026, version A3).
Mold Compatibility Check: PP LGF20 requires a gate diameter of 5–6 mm. Pin-point gates are not suitable. Please confirm your mold meets this requirement before requesting a trial sample. If your gate is smaller than 5 mm, PP LGF20 cannot be molded in your existing tool - contact us to review alternatives.
PP GF20 vs PP LGF20: Why Engineers Upgrade
PP LGF20 is not a stronger PP GF20. It is a different reinforcement system. In short-fiber PP GF20, the fibres break down to < 3 mm during molding and cannot form a load-bearing skeleton. In PP LGF20, the long fibres survive molding and form a skeleton that carries load, resists creep and absorbs impact. That skeleton is why PP LGF20 holds up under repeated impact and sustained load where short-fiber grades fatigue and crack. The result is a step change in toughness and long-term performance, not a marginal gain.
It is not a drop-in replacement. PP LGF20 needs a gate diameter of 5–6 mm, and pin-point gates are not suitable (see the check above). When the mold meets this requirement, PP LGF20 can replace PP GF20 in mass-market structural parts, and in many cases heavier ABS or nylon, at lower weight.
Schematic, not to scale: long fibres (10–12 mm) form a load-bearing skeleton, while short fibres (< 3 mm) stay fragmented.
| Property | PP GF20 (Short Fiber) | PP LGF20 (Long Fiber) |
|---|---|---|
| Fiber length in pellet | Short fibres (< 3 mm) | 10–12 mm |
| Fiber skeleton in molded part | Fragmented, no load-bearing skeleton | Load-bearing skeleton |
| Notched impact strength | Lower and inconsistent | 29 kJ/m² (ISO 180) |
| Creep resistance | Lower | Higher |
| Fatigue resistance | Lower | Higher |
| Warpage / shrinkage | Higher, less stable | Lower, more stable |
| Mold requirement | Standard gates | Gate diameter 5–6 mm; no pin-point gates |
PP LGF20 values are from the official TDS (NG02-2). Short-fiber performance varies by grade and supplier. This table compares reinforcement mechanisms, not one competing grade. For a number-to-number comparison, specify the competing grade's TDS.
PP LGF20 Applications
Automotive Bumper Energy Absorbers
Unlike standard short-fiber plastics that shatter under impact, PP LGF20's internal long-fiber skeleton absorbs and disperses crash energy, preventing sudden brittle failure. Its 29 kJ/m² Charpy impact (ISO 180) and 1.05 g/cm³ density make it a cost-effective lightweighting choice for bumper modules that must meet vehicle lightweighting standards.
Child Safety Seat Skeletons
Safety components must never crack catastrophically under extreme deceleration. With 20% long glass fibers, PP LGF20 balances stiffness and elasticity, distributing impact energy through the skeleton to protect the passenger compartment. Its 103 MPa tensile strength (ISO 527) supports structural seat components that carry load in a crash.
Industrial Power Tool Housings
Heavy-duty drills and saws endure drops and severe vibration. PP LGF20 resists housing fatigue and long-term creep better than short-fiber PP or ABS, while keeping housings light for handheld use. Its 3,693 MPa flexural modulus (ASTM D-790) keeps housings rigid under assembly and working loads.
How to Mold PP LGF20?
PP LGF20 runs on standard injection molding machines, with two non-negotiable items: a gate diameter of 5–6 mm and pre-drying.
Schematic, not to scale. Numbers refer to the steps below.
① Drying: Dry the pellets for 2–4 hours at 80–90°C, and keep moisture below 0.1%. Long-fiber pellets pick up surface moisture, and wet pellets degrade during molding.
② Melting: Melt at 210–250°C. Use a low-shear screw and avoid overheating, which breaks fibres and degrades the material.
③ Injection: Inject at 69–103 MPa. Keep flow paths open and shear low so the long fibres survive to the part.
④ Gate: Use a gate diameter of 5–6 mm. Pin-point gates are not suitable: they shear the fibres at the gate and destroy the reinforcement. If your gate is smaller than 5 mm, do not run PP LGF20 in that tool.
⑤ Mold: Hold the mold at 38–77°C. Confirm the mold temperature by measurement, not by the machine setting, since mold temperature affects appearance and dimensional stability.
Processing parameters are from the official TDS (NG02-2). Actual settings depend on part design, mold and machine. Validate with a trial sample before production.
Which PP LGF20 Grade Should You Choose?
Start from the job, not the datasheet. The general grade (PP LGF20) is the default answer for mass-market structural parts. Move to a special grade only when a specific requirement forces it - outdoor exposure, sustained heat, higher performance, or a tighter budget. Each special grade is a trade-off, not an upgrade on every property. Request the TDS of the grade you choose, and confirm it with a trial sample.
| If you need | Choose | Next step |
|---|---|---|
| General structural parts with no special requirement | HPP LGF20 (General) | Download TDS |
| A lower-cost option for high-volume parts | HPP LGF20-C (Economical) | Download TDS |
| Parts exposed to heat and aging | HPP LGF20 AR (Aging & Heat Retardant) | Inquiry to obtain the TDS |
| Higher stiffness and strength than the general grade | HPP HLGF20 (High Performance) | Inquiry to obtain the TDS |
| Outdoor parts exposed to UV | HPP LGF20 V (UV Retardant) | Download TDS |
Each variant has its own TDS. Do not apply the general grade's values to a special grade - request the TDS of the grade you choose.
FAQ
Can PP LGF20 replace my current PP GF20 without changing the mold?
In most cases, check the gate first. PP LGF20 needs a 5–6 mm gate; pin-point gates are not suitable. If your mold meets this requirement, the matching 20% content makes it a direct upgrade for impact and creep resistance. Send us your gate size and we will confirm.
What gate size does PP LGF20 require?
A minimum gate diameter of 5–6 mm. Pin-point gates shear the long fibres at the gate and destroy the reinforcement, so they are not suitable. If your gate is smaller than 5 mm, do not run PP LGF20 in that tool - contact us to review alternatives.
Can I order a small trial batch before committing to bulk?
Yes. We offer a 25 KG trial MOQ - one bag - so you can validate shrinkage, stiffness and molding behavior on your own machines before scaling up.
Does the general grade resist UV outdoors?
No. The general grade PP-LGF20-NG02-2 has no UV stabilization. For outdoor parts exposed to sunlight, choose the UV-retardant grade PP-LGF20-NG02V-2 instead. Its TDS is linked in Grade Selection above.
What does the 156 °C HDT mean for my part?
HDT 156 °C (ISO 75-2) means the material keeps its shape under load up to high temperatures - suitable for parts near heat sources, such as under-hood and appliance components. It is a laboratory value; validate it on your actual part.
What is the difference between HPP and CPP grades?
This page covers HPP (homopolymer), which offers higher stiffness and heat deflection. CPP (copolymer) offers better low-temperature impact resistance. If your part faces cold impact, contact us for the CPP grade PP-LGF20-NG02-1.
Request PP LGF20 TDS & Trial Sample
Send us your part drawing and current grade. We will confirm whether PP LGF20 fits, recommend the right variant if needed, and arrange a trial sample.
Ordering grade: LFT-G® PP-LGF20-NG02-2 - 20% LGF, homopolymer (HPP), natural.
Email: Candyhu@lfrtplastic.com
WhatsApp: +86 139 5009 5707
Related Grades
PP LGF20
Lower fiber content for parts where toughness and flow matter more than stiffness.
Current Grade
PP LGF40
Higher fiber content for parts that need more stiffness than PP LGF20 provides.
Hot Tags: PP LGF20, Long Glass Fiber Polypropylene, Long Fiber Reinforced PP, PP LGF Compound
