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PPS CNC Machining Service

In the CNC machining process, Polyphenylene Sulfide or PPS can serve as a substitute for thermosetting plastics and metals. Unfilled PPS is highly suitable for precision machined components due to its very low coefficient of linear thermal expansion and stress-relieved manufacturing. It can be used for structural applications in corrosive environments or as a cost-effective replacement for PEEK at lower temperatures. Additionally, its low ionic impurities make it an ideal option for applications where high purity is necessary.

At Runsom Precision, we excel in providing PPS CNC machining services with speedy production and prompt delivery for your custom PPS CNC machining designs and reverse engineering needs. Our team assists you through the entire life cycle of your project, from design to prototyping, tooling/mold production, and final production. Our knowledgeable staff may also recommend seal modifications to facilitate assembly, installation, cleaning, and repairs.

What Is Polyphenylene Sulfide/PPS?

PPS machining part

Polyphenylene Sulphide, short for PPS, a high temperature thermoplastic polymer, is semi-crystalline in nature. This polymer is known for its exceptional resistance to chemicals, making it one of the most sought after advanced engineering plastics. Additionally, PPS polymer boasts high strength and hardness, particularly in high temperature conditions. It also has good dimensional stability and low moisture absorption.

Machining PPS is relatively simple, and precision can be achieved by utilizing carbide tipped machine tools, maintaining moderate cutting speeds, and implementing fast feed rates. A slow feed may lead to suboptimal surface finishes. Additional annealing may be necessary to prevent cracking if multiple machining is conducted.

PPS Plastic CNC Machining Manufacturer – Custom CNC Machined PPS Parts

Runsom Precision utilizes advanced techniques and equipment to deliver high-quality PPS machined parts. Whether it is a simple PPS prototype or 3D prototyping, our experts can use CNC machining technology to handle complex surfaces and geometric features. This provides a viable alternative to 3D printing or sintering. We mostly use 40% glass reinforced PPS to make your custom machined PPS parts or components. Additional PPS grades are also available, including glass- and mineral-filled, as well as internally lubricated. These grades are designed to cater to different levels of requirements and come in different formulations that offer different properties such as increased impact strength, bearing strength, low friction, high limiting PVs,  wear resistance, static control, and heat stability.

All you have to do is upload your 3D files, and we can provide you with an online quotation and an estimated delivery time in less than 24 hours.

PPS CNC Machining Specification


Surgical instrument components, gears, impellers, roller bearings, pump components, filter housings, heat shields, nozzles, bushings, chain guides, etc.


It is determined by the desired effect and the PPS type used. A tolerance of ±0.010” (±0.25 mm) is available at Runsom.


High chemical resistance, low moisture absorption, good dimensional stability, excellent flame retardance, good resistance to high temperature and radiation.

Wall Thickness

It is mostly decided by the PPS type and part geometry. A minimum wall thickness of ±0.03” (±0.8 mm) is available at Runsom.

Lead Time

As fast as 3 days, but it will be finally determined by part complexity and order quantity.

Max Part Size

The available size is mostly determined by the machine and part geometry.


3-axis & 5-axis CNC milling.


Low impact strength, more costly than general engineering plastics, poor toughness, easy to crack.

Properties of Polyphenylene Sulphide

The PPS polymer is well-suited for creating intricate components with ultimate precision, thanks to its exceptional properties. It maintains its dimensional stability even when subjected to elevated temperatures and moisture levels.

Tensile Strength


Elongation at Yield


Elongation at Break


Service Temperature


Melting Temperature


Benefits of PPS Plastic

High chemical resistance
Low moisture absorption
Good dimensional stability
High elastic modulus
Good electrical insulation
High chemical resistance
Good resistance to high temperature
High mechanical strength
Great radiation resistance
High creep resistance

Typical PPS Components & Applications

Polyphenylene Sulfide is an ideal option for numerous applications that require high performance and cost-effectiveness due to its remarkable attribute, ease of production, and affordability.

Common applications employing PPS as materials include:

1. Appliances
The excellent dimensional stability, low density, corrosion and hydrolysis resistance of PPS make it a great option for manufacturing various parts in electric appliances, such as frying pan handles, heating and air conditioning components, steam iron valves, microwave oven turntables, toaster and dryer switches, and more.

2. Electronics
The E&E industry prefers using PPS because it possesses several favorable properties that include high temperature resistance, good dimensional stability, and rigidity. Moreover, PPS enables precise molding of connectors and sockets due to its low shrinkage and great flow, provides reliable construction by enhancing structural rigidity and mechanical integrity, and is the most dependable option for soldering.

3. Automobile
The use of PPS in the automotive sector has experienced rapid growth due to its capacity to replace metal, thermosets, and other types of plastics in applications with higher demands. Its outstanding properties make it a top choice for automotive parts that are subjected to elevated temperatures, mechanical stress, and contact with vehicle fluids.

4. Industrial
The field of mechanical engineering has seen a significant substitution of metal alloys, thermosets, and other thermoplastics with PPS. The thermal stability and strong chemical resistance of Polyphenylene Sulfide make it a suitable choice for usage in highly corrosive environments. It's also an excellent fit for various heavy-duty industrial applications.

Some commonly used PPS components are:

Valve components
Transformer frame
Water pump impellers
Coil frame
Thermostat holder
Electric brakes