# Injection Molded PEEK: Properties, Processing Parameters & Uses | RenJie Plastics

> Source: https://www.rjplastics.com/en/product/carbon-fiber-peek

## PEEK Solutions

[Home](/en/)›[Products](/en/products)›[ESD Plastics](/en/products/esd-lastics)›[PEEK Solutions](/en/products/peek-solutions)›**Injection Molded PEEK Natural**

      **## Injection Molded PEEK Natural Model: K90N/K100N**

    RENJIE® injection molded PEEK guide: 260 °C continuous use, 360–400 °C barrel, 150–200 °C mould, 150–160 °C drying for 3–4 h. Full parameter table plus applications by industry.

| Product Description | Carbon fiber PEEK |
| --- | --- |
| RenJie®Grade | K90N/K100N |
| Appearance | Granules/Natural |
| Conductive filler | Carbon fiber/Carbon nanotube |
| Applications | Injection Molded parts, PEEK sheet |
| Processing | Extrusion/Injection |

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    Overview
    Specifications

## RENJIE® Injection Molded PEEK: Properties, Processing Parameters and Applications

PEEK (polyetheretherketone) is a high-performance thermoplastic engineering plastic with an excellent overall property balance, which makes it particularly well suited to precision injection moulding. It is, however, an unforgiving material to process: high melting point and high melt viscosity mean the parameters must be set deliberately, not inherited from a PA or POM job.

This guide covers the property profile that justifies PEEK, the processing window that makes it work, and where it is actually used.

### Properties of Injection Molded PEEK

| Property | Value / behaviour |
| --- | --- |
| Continuous operating temperature | up to 260 °C |
| Short-term temperature resistance | up to 300 °C or higher |
| Heat distortion temperature (HDT/A, 1.8 MPa) | >300 °C |
| Water absorption | <0.1% |
| Friction behaviour | Self-lubricating, low coefficient of friction, runs without lubrication long-term |
| Electrical behaviour | High dielectric strength, low dielectric constant and loss factor, stable at high frequency and high temperature |
| Chemical resistance | Acids, alkalis, oils, organic solvents and most chemicals; attacked only by strong oxidising media such as concentrated sulphuric acid |

#### High temperature resistance

Continuous operating temperature reaches **260 °C**, with short-term resistance to **300 °C or higher**. The heat distortion temperature under 1.8 MPa load exceeds **300 °C**, so the material holds its shape in service temperatures that would soften most engineering plastics.

#### Excellent mechanical properties

High strength, high rigidity and fatigue resistance, with good mechanical stability even at elevated temperature — the combination that allows metal parts to be replaced without losing load capability.

#### Chemical corrosion resistance

Excellent resistance to acids, alkalis, oils, organic solvents and most chemicals. The material is corroded only in strong oxidising media such as concentrated sulphuric acid — a critical distinction when specifying seals and pump internals.

#### Low friction and wear resistance

Excellent self-lubricating properties and a low coefficient of friction allow long-term operation without lubrication, removing grease from the design and the maintenance schedule.

#### Electrical insulation

High dielectric strength with low dielectric constant and loss factor, maintaining stable electrical properties even at high frequencies and high temperatures — suited to connectors and test fixtures rather than only structural parts.

#### Dimensional stability

Extremely low water absorption (**<0.1%**) gives high dimensional accuracy after moulding and minimal shift with humidity, so a part moulded to tolerance stays within tolerance in a humid plant.

### Injection Molding Processing Technology

Processing injection moulded PEEK requires special control because of its high melting point and high viscosity. The window below is the working baseline.

| Parameter | Setting |
| --- | --- |
| Drying (before moulding) | 150–160 °C for 3–4 h |
| Barrel temperature | 360–400 °C |
| Nozzle temperature | 370–400 °C |
| Mould temperature | 150–200 °C |
| Injection speed | Medium to high |
| Holding pressure | Appropriately high |
| Screw speed | 30–60 rpm |
| Annealing (post-treatment) | 150–200 °C for 1–2 h |

#### 1. Raw material preparation

Dry the resin at **150–160 °C for 3–4 hours** before injection moulding. This removes trace moisture and prevents bubbles and silver streaks in the moulded part.

#### 2. Injection temperature control

**Barrel temperature: 360–400 °C**, adjusted according to part thickness and flowability requirements. **Nozzle temperature: 370–400 °C.** **Mould temperature: 150–200 °C**, which ensures sufficient crystallisation and reduces internal stress.

#### 3. Injection parameters

**Injection speed:** medium to high, to ensure complete mould filling. **Holding pressure:** appropriately high, to reduce shrinkage and warpage. **Screw speed: 30–60 rpm**, to avoid shear overheating.

#### 4. Post-treatment

**Annealing at 150–200 °C for 1–2 hours** eliminates internal stress and improves dimensional stability. Skipping it is the usual reason a PEEK part measures correctly on the bench and drifts after annealing or in service.

#### Reading the process window

| Symptom | First parameter to check |
| --- | --- |
| Bubbles, silver streaks | Drying time and temperature (150–160 °C, 3–4 h) |
| Short shots, incomplete fill | Injection speed and barrel temperature |
| Warpage, excessive shrinkage | Holding pressure, mould temperature, annealing |
| Brittle parts, high internal stress | Mould temperature and annealing cycle |
| Surface degradation, black specks | Barrel residence time and screw speed (shear overheating) |

### Applications of Injection Molded PEEK

| Industry | Typical parts |
| --- | --- |
| Artificial intelligence | AI intelligent infrastructure components |
| Aerospace | Aircraft engine components, fasteners, sensor housings |
| Automotive | Transmission parts, braking system components, high-temperature electrical connectors |
| Medical devices | Surgical instruments, artificial joints, dental implants |
| Electronics and electrical | High-frequency connectors, insulating supports, chip test fixtures |
| Petrochemicals | Valve seals, pump impellers, downhole measuring instrument components |
| Food processing | Temperature-resistant, corrosion-resistant food-contact components |

### Frequently Asked Questions

**What barrel temperature should be used for PEEK?** 360–400 °C, adjusted for part thickness and flowability. Nozzle temperature runs slightly higher, at 370–400 °C.

**What mould temperature does PEEK need?** 150–200 °C. A hot mould ensures sufficient crystallisation and reduces internal stress; a cold mould produces brittle, dimensionally unstable parts.

**Does PEEK need drying before moulding?** Yes. Dry at 150–160 °C for 3–4 hours to remove trace moisture and avoid bubbles and silver streaks.

**Is annealing necessary?** Annealing at 150–200 °C for 1–2 hours eliminates internal stress and improves dimensional stability. It is strongly recommended for precision parts.

**What is PEEK's maximum service temperature?** Continuous operating temperature up to 260 °C, short-term up to 300 °C or higher, with HDT/A at 1.8 MPa exceeding 300 °C.

**What chemicals attack PEEK?** Strong oxidising media such as concentrated sulphuric acid. PEEK resists acids, alkalis, oils, organic solvents and most other chemicals.

### Moulding PEEK with RENJIE®

- Consistent granule quality — moisture-controlled supply, so drying behaves predictably.
- Grade selection support — unfilled, carbon-filled, glass-filled and ESD grades matched to the part, not the catalogue.
- Process guidance — the parameter window above, plus troubleshooting support for first-article runs.

**Send your part drawing, service temperature and chemical exposure to receive a grade recommendation and processing sheet.**

| Product Description | Carbon fiber PEEK |
| --- | --- |
| RenJie®Grade | K90N/K100N |
| Appearance | Granules/Natural |
| Conductive filler | Carbon fiber/Carbon nanotube |
| Applications | Injection Molded parts, PEEK sheet |
| Processing | Extrusion/Injection |

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