Views: 220 Author: plastic-material Publish Time: 2026-04-07 Origin: Site
Content Menu
● 1. What is the Standard PEEK Material Density?
● 2. Factors Influencing PEEK Density: Fillers and Grades
>> 2.1 Glass Fiber Reinforced PEEK (GF30)
>> 2.2 Carbon Fiber Reinforced PEEK (CF30)
>> 2.3 Bearing Grade PEEK (PTFE/Graphite/Carbon Fiber)
● 3. Why Density Matters: A Technical Deep Dive
>> A. The "Lightweighting" Advantage in Aerospace
>> B. Rotational Inertia in High-Speed Machinery
>> C. Processing and Cooling Rates
● 4. Advanced Industry Insight: The Impact of 3D Printing on PEEK Density
● 5. User Insights: Real-World Feedback from the Field
● 6. How Dongguan PRES Group Ensures Precision
● 7. Strategic Implementation: How to Choose?
● 8. Conclusion and Call to Action
● FAQ: Frequently Asked Questions
As the global manufacturing landscape shifts toward "metal replacement" strategies, PEEK (Polyetheretherketone) has emerged as the undisputed heavyweight champion of high-performance thermoplastics. However, in my decade of experience working with specialized polymers at Dongguan PRES Group Co., Ltd., I've realized that many engineers overlook a fundamental physical property that dictates the success of a project: PEEK material density.
Whether you are designing aerospace components where every gram counts or medical implants that require biocompatibility, understanding the nuances of density is critical. In this guide, we will dive deep into why PEEK's density is a game-changer, how fillers alter its physical profile, and how our OEM services can help you leverage these properties.
At its core, pure or "virgin" PEEK is a semi-crystalline thermoplastic. The standard PEEK material density is approximately 1.30 to 1.32 g/cm³.
To put this into perspective, let's compare it to common engineering metals:
Aluminum (6061): ~$2.70 \text{ g/cm}^3$
Titanium (Ti-6Al-4V): ~$4.43 \text{ g/cm}^3$
Stainless Steel (316): ~$8.00 \text{ g/cm}^3$
By using PEEK, engineers can achieve a weight reduction of over 50% compared to aluminum and more than 80% compared to steel, without sacrificing significant mechanical integrity in specific temperature ranges.
While virgin PEEK is the baseline, the industry rarely uses just one "flavor." At Dongguan PRES Group, we manufacture various grades tailored to specific mechanical requirements. Each additive significantly shifts the density profile.
Adding 30% glass fiber increases the density to approximately 1.49 - 1.51 g/cm³. This grade is ideal for structural applications requiring higher dimensional stability and electrical insulation.
Carbon fiber is the "gold standard" for strength-to-weight ratios. 30% carbon fiber reinforcement results in a density of roughly 1.40 - 1.44 g/cm³. Interestingly, it is lighter than glass-filled PEEK but significantly stiffer.
Often called PEEK-FC30, this blend is optimized for friction and wear. The density typically sits around 1.45 - 1.48 g/cm³.
| PEEK Grade | Density (g/cm³) | Primary Benefit |
| Virgin PEEK (PRES-V01) | 1.30 - 1.32 | Purity, Biocompatibility, Chemical Resistance |
| 30% Glass Filled | 1.49 - 1.51 | High Stiffness, Thermal Insulation |
| 30% Carbon Filled | 1.40 - 1.44 | Highest Strength-to-Weight, Thermal Conductivity |
| Bearing Grade | 1.45 - 1.50 | Low Friction, High Wear Resistance |
As a leading China-based factory, we often consult for foreign brands on Total Cost of Ownership (TCO). Density isn't just a number on a datasheet; it's a financial and functional metric.
In aerospace, the cost to launch 1kg of payload can range from $5,000 to $20,000. By replacing stainless steel brackets with PEEK (density 1.32 vs 8.0), a single aircraft can shed hundreds of kilograms, leading to massive fuel savings over the vessel's lifespan.
For rotating parts like impellers or bushings, lower density means lower mass, which directly reduces centrifugal force. This allows machines to run at higher RPMs with less vibration and less strain on bearings.
In our injection molding and extrusion lines at Dongguan PRES Group, we monitor density to ensure crystallinity. PEEK is polymorphic; its density can slightly vary depending on how fast it is cooled. A higher density often correlates with higher crystallinity, which translates to better chemical resistance and wear life.
One "information gap" in many online resources is the difference between bulk density and printed density. As a provider of high-performance 3D printing filaments, we've observed that FDM (Fused Deposition Modeling) PEEK parts often have a slightly lower effective density than injection-molded parts.
Expert Tip: When 3D printing PEEK, internal micro-voids can reduce the effective density by 2% to 5%. To achieve a density close to the theoretical $1.32 \text{ g/cm}^3$, the build chamber must be heated to at least 180°C to ensure proper inter-layer fusion and crystallization.
We've integrated feedback from our global wholesale partners to highlight common practical concerns regarding PEEK material density:
The "Sink" Test: One client from Germany noted: "We use density verification as a quick QA tool. If a 'Virgin PEEK' rod arrives with a density of 1.35, we know immediately it's contaminated or improperly processed."
The Cost-Volume Paradox: A manufacturer in the US pointed out: "While PEEK is expensive per kilogram, its low density means you get much more volume per kg compared to metal. When calculated per cubic inch, the price gap narrows."
Choosing the right partner is vital when dealing with high-cost materials like PEEK. At Dongguan PRES Group Co., Ltd., we provide:
Strict OEM Standards: Whether you need pellets, plates, or rods, our density tolerances are kept within $\pm 0.01 \text{ g/cm}^3$.
Custom Compounding: We can adjust PEEK material density by customizing filler percentages to meet your specific weight-bearing requirements.
Global Logistics: We serve brand owners and wholesalers worldwide, ensuring that our high-performance plastics meet international ISO and ASTM standards.
If you are currently evaluating PEEK for your project, follow these steps:
Define the Weight Limit: If your project is weight-critical (UAVs, Satellites), stick to Virgin or Carbon-filled PEEK.
Assess Environmental Exposure: For high-pressure subsea environments, the density and low moisture absorption (0.1%) of PEEK prevent dimensional swelling.
Verify Crystallinity: Ensure your supplier provides a DSC (Differential Scanning Calorimetry) report to prove the density corresponds to the correct crystalline structure.
Understanding PEEK material density is the first step toward optimizing your product's performance and cost-efficiency. From its incredible weight-saving potential to its versatile reinforced grades, PEEK remains the gold standard for demanding environments.
Are you looking for a reliable China-based partner for your PEEK requirements?
Dongguan PRES Group Co., Ltd. offers a full range of PEEK products—from raw pellets to precision-machined rods and 3D printing filaments. We specialize in OEM services for international wholesalers and producers.
[Contact our Engineering Team Today] to request a datasheet or a bulk quote for your next project. Let's build something lighter and stronger together.
Victrex PLC: Technical Data Sheet: PEEK Properties Comparison. [Link to Victrex]
ASTM D792: Standard Test Methods for Density and Specific Gravity (Relative Density) of Plastics by Displacement. [Link to ASTM]
ScienceDirect: Crystallinity and Density relationships in Polyetheretherketone (PEEK). [Link to ScienceDirect]
Dongguan PRES Group Internal Lab Data: Comparative Analysis of GF30 vs CF30 PEEK Extrusions (2025).
NASA Technical Reports: Polymer Weight Reduction in Aerospace Brackets. [Link to NASA]
Q1: Does the density of PEEK change at high temperatures?
A: Like all materials, PEEK expands when heated, meaning its density decreases slightly as volume increases. However, its low Coefficient of Thermal Expansion (CTE) ensures it remains more stable than most plastics up to its glass transition temperature ($143^\circ\text{C}$).
Q2: Can I distinguish Virgin PEEK from Glass-Filled PEEK by sight?
A: Not always reliably. Virgin PEEK is typically a tan/brownish color, while filled grades can look similar or slightly grayer. Using a density test (displacement method) is the only foolproof way to verify.
Q3: How does moisture absorption affect PEEK density?
A: PEEK has extremely low moisture absorption (less than 0.1% over 24 hours). Therefore, humidity has a negligible effect on its density compared to nylon or other polyamides.
Q4: Why is my 3D printed PEEK part lighter than the raw filament?
A: This is usually due to "infill percentage" or microscopic porosity between layers. To match the density of a molded part, you must optimize for 100% infill and high extrusion temperatures.
Q5: Is PEEK density high enough for subsea "sink" applications?
A: With a density of 1.32 g/cm³, PEEK is denser than water (1.0 g/cm³), so it will sink. This makes it suitable for subsea components that must remain submerged without heavy weighting.
