Our Capbility of Plastic Machining

CNC Plastic Machining Milling

RpProto provides high-quality plastic CNC Machining services with guaranteed quality, quick turnaround times, and reasonable rates. We have hundreds of state-of-the-art 3-axis, 4-axis, and 5-axis CNC milling machines to manufacture precise parts with complex geometries.

We have rich knowledge of thermoset and thermoplastic engineered materials. We can fulfil complex orders for prototypes and low volume production runs in a wide variety of plastics and surface finish options.

CNC machining can reduces set up time and cost, since it enable us to make complex parts in a single setup. RpProto has been delivering CNC plastic machining and fabricating plastic components for global customers at competitive pricing for more than 20 years.

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What is CNC Plastic Machining ?

Plastic CNC machining is a subtractive process for creating complicated plastic components. The use of sophisticated 3, 4 and 5 axis CNC machines allows plastic to be machined from multiple sides and end parts with complex geometries can be achieved using this process.
Includeing CNC drilling, Plastic CNC turning, or Plastic CNC milling, CNC plastic machining can quickly create thousands of precise parts with incredibly tight tolerances.
CNC machining plastic is able to achieve tighter tolerances than 3D printing or vacuum casting. It is also more cost-effective than injection molding for low-volume manufacturing.This is the most efficient and economical technology for the rapid manufacturing of plastic prototypes.

cnc machine
  • 3-axis CNC Machines: Produce the most common geometries and are best suited for designs that do not require multiple rotations of the workpiece. 3-axis machines are typically used to drill holes, mill slots, or machine previse edges.
  • 4-axis CNC Machines: Allow access to an additional side of the workpiece, allowing the milling of holes, slots, and other features to the side of a part.
  • 5-axis CNC Machines: Provide the highest precision and use multidimensional rotation to allow access to all sides of a workpiece, allowing the creation of intricate details and complex designs. These CNC machines are widely used for aerospace and medical products, as well as industrial and consumer goods.

Plastic Materials for Machining

CNC Plastic Milling
For rapid prototypes and low-volume production parts, we have a wide range of industrial-grade plastics. They have mechanical properties similar to injection-molded parts (ABS, PC, PP, PVC, POM, PMMA, PA 6/66).
  • ABS
  • Acetal Plastic
  • CPVC
  • POM / Delrin
  • HDPE
  • LDPE
  • Nylon / PA66
  • PEEK
  • PEI
  • PET
  • PMMA /Acrylic
  • Polycarbonate / PC
  • Polypropylene / PP
  • PPSU
  • PS
  • PSU
  • PTFE
  • PVC


Common thermoplastic, impact resistant, machinable.It is widely used in general product shells.

Tensile Strength : 6,000 psi
Impact Strength : 2.7 ~ 7.7 ft-lbs / in
Heat Deflection : 203 ~ 214 ° F

lower heat deflection and tensile strength than regular ABS

Tensile Strength : >5,500 psi
Impact Strength : 4 ft-lbs / in
Heat Deflection : 194 ° F

Acetal 20% Glass Filled / Delrin 570

CNC Machining Acetal

20% glass-filled fiber with high stiffness and excellent performance at elevated temperatures

Tensile Strength : 8,500 psi
Impact Strength : 0.8 ft-lbs/in
Heat Deflection : 316-345° F

Acetal Copolymer

CNC Machining Acetal

High strength and stiffness. Low moisture absorption

Tensile Strength : 8,800 psi 
Impact Strength : 1.0 ft-lbs/in
Heat Deflection : 230-316° F

Acetal Homopolymer / Delrin 150

CNC Machining Acetal

High tensile strength, creep resistance, and overall toughness

Tensile Strength : 9,000 psi
Impact Strength : 1.5 ft-lbs/in
Heat Deflection : 257-336° F

Acetal Static Dissipative / Tecaform SD

CNC Machining Acetal

Excellent bearing and wear properties. Good for components that will undergo friction or fluid flow contact

Tensile Strength : 6,600 psi
Impact Strength : 1.8 ft-lbs/in
Heat Deflection : 190° F

Nylon 6


Excellent bearing and wear properties. Good overall mechanical properties
Tensile Strength : 10,000 psi
Impact Strength : 0.6 ft-lbs/in
Heat Deflection : 200-370° F

Nylon 6/6


PA66,Outstanding wear resistance and frictional properties. Poor dimensional stability
Tensile Strength : 10,000 psi
Impact Strength : 1.1 ft-lbs/in
Heat Deflection : 194-455° F

Nylon 6/6 30% Glass Filled


PA66+GF30,  Nylon 6/6 30% Glass Filled High heat deflection combined with superior wear and abrasion resistance.
Tensile Strength : 12,000 psi
Impact Strength : 1.0 ft-lbs/in
Heat Deflection : 482-490° F

Polycarbonate (PC)

PC board

Material with good strength, toughness and transparency, suitable for Lens and fine-structure parts production.

Tensile Strength : 8,000-9,500 psi
Impact Strength : 2.0-16.0 ft-lbs/in
Heat Deflection : 270-280° F

Polycarbonate (PC) 20% Glass Filled

PC board

Glass fiber is added to improve the rigidity and heat resistance of the plate, which can be used to make parts that need to maintain high rigidity in a high temperature environment.

Tensile Strength : 16,000 psi
Impact Strength : 2.06 ft-lbs/in
Heat Deflection : 298° F

Ultem 1000 / PEI

Amber in colour, translucent.

Tensile Strength : 15,200 psi
Impact Strength : 1.0 ft-lbs/in
Heat Deflection : 390 ~ 410 °F

Ultem 2300 / PEI 30% Glass Filled

High heat resistance and keeps its tensile qualities when heated.

Tensile Strength : 24,500 psi
Impact Strength : 1.6 ft-lbs / in
Heat Deflection : 400 °F


High heat and corrosion resistant. Self extinguishing and flame spread of less than 20 

Tensile Strength : 7,300 psi
Impact Strength : 9 ft-lbs/in
Heat Deflection : 198 °F

It is a rigid transparent material with the best transparency.It can be dyed, electroplated, sprayed, screen printing and other methods.

Tensile Strength : 10,800 psi
Impact Strength : 6.8 ft-lb / in²
Heat Deflection : 185 ~ 210 °F

Polypropylene (PP)

It is a versatile translucent material that is low in cost and machinable. It has good impact resistance, excellent flexibility. It can be used for production requirements with strict impact resistance conditions, such as: automotive supplies, half-folding packaging boxes, etc.

Tensile Strength : 4,200 psi
Impact Strength : 1.2 ft-lbs /in
Heat Deflection : 96 ~ 195 °F


PET plate

Excellent wear resistance, high flexural modulus, and is a good electrical insulator 

Tensile Strength : 11,500 psi
Impact Strength : 0.6 ft-lbs/in
Heat Deflection : 175-240° F

Good material option when thermal, chemical, and combustion properties are required

Tensile Strength : 14,000 psi
Impact Strength : 1.55 ft-lbs/in
Heat Deflection : 285-482° F

Polypropylene Homopolymer (PPH)

High strength-to-weight ratio and good thermoforming and corrosive performance.

Tensile Strength : 4,800 psi
Impact Strength : 1.2 ft-lbs / in
Heat Deflection : 210 ° F

Noryl EN265 PPE+PS

Suitable to make shell, because of its insulating qualities, flame resistance and remarkable dimensional stability.

Tensile Strength : 9,200 psi
Impact Strength : 3.5 ft-lbs / in
Heat Deflection : 254 ~ 279 ° F

PTFE / Teflon

PTFE (Teflon)

outstanding chemical resistance and an unparalleled coefficient of friction

Tensile Strength : 2,900 ~ 5,100  PSI
Impact Strength : 2.0 ~ 6.0 ft-lbs / in
Heat Deflection : 500 ° F


transparant pvc

It is chemical resistant, low-cost material.

Tensile Strength : 7,800 PSI
Impact Strength : 0.8 ft-lbs / in
Heat Deflection : 162 ~ 172 ° F



Exceptional dimensional stability. Good choice for housings due to insulating properties and flame resistance

Tensile Strength : 9,200 psi
Impact Strength : 3.5 ft-lbs/in
Heat Deflection : 254-279° F

Tolerances for CNC Plastic Machining

0.5 – 6.00 mm± 0.10 mm
6.00 – 30.00 mm± 0.20 mm
30.00 – 120.00 mm± 0.30 mm
120.00 – 400.00 mm± 0.50 mm
400.00 – 1000.00 mm± 0.80 mm
Angular: ±0.5°
Surface Roughness 3.2μm Ra

With drawing: Tolerance quality equivalent to IT11 can be achieved.
Without drawing: ISO 2768 medium

Example of application of tolerances:

Example of application of tolerances of CNC-Machining Plastic

Inspection Capabilities

After manufacturing, machined plastic components should be inspected to ensure that they are qualified and precise. Precision parts, which frequently have a complex structure and unique shapes, must be measured in multiple steps.

CMM machine

Surface Finishes

Plastic Painting

There are many processes for surface finish of plastic materials such as nylon, PP, PET, etc. Painting involves spraying paint onto the surface of the plastic part. It helps to improve the aesthetic appeal of a plastic part. It also offers protection to the plastic surface.

Nylon, PP and other plastic materials have high surface crystallinity and low polarity. When spraying ordinary paint, rubber paint, PU paint and other paints, due to the poor interlayer adhesion between the substrate and the paint, the surface of the material will fall off. question. To solve the phenomenon of paint peeling on the surface, flame treatment or corona treatment can be performed on the spray material, or a layer of adhesion promoter can be sprayed between the substrate and the paint to disrupt the molecular arrangement on the surface of the substrate and solve the adhesion problem.

Advantages of Plastic Machining

Fast Turnaround

Because there’s no need to make a mold to build the prototypes. For customer who needs plastic parts manufactured rapidly, CNC machining is the best option. The lead time is much shorter.

Economical Process

Plastic CNC machining does not require molds, which reduces costs and startup times. Molds must be built for injection molding or vacuum casting, which takes a significant amount of time and resources. Plastic CNC machining, on the other hand, does not. As a result, the cost of prototype manufacturing is lower than that of other processes.

Tight Tolerances

Plastic CNC machining can achive tight tolerance measurements. As a result, it’s a fantastic method for producing parts that require tight tolerances. For prototypes that will be employed in high-precision industries, this is critical.

Corrosion Resistance

Compared to metal parts which can easily rust after extended use, plastic parts are more resistant to corrosion.

Application of CNC Plastic Machining

Plastic parts made by CNC machining includs Medical devices, Food and beverage industry components, Semiconductor components, Automotive and aerospace industry components.

CNC Plastic Machining FAQs

CNC Plastic Machining

Plastic machining is a manufacturing process that involves cutting a piece of raw plastic until a final desired shape or object remains. With CNC plastic machining, unwanted geometry is cut from a raw block of plastic, bit by bit with a computer numerically controlled (CNC) milling tool, very precisely and allows complicated parts to be produced with great accuracy.

The cost of plastic CNC machining depends on the complexity and size of the part as well as the type of plastic that is used. These variables will influence the type of machine that is required, the time it takes to produce the part, and the cost of the raw material.

We use machine learning algorithms to calculate the exact cost of any machinable part directly from a CAD file, based on millions of CNC machining orders we’ve previously processed. Simply upload a CAD file to generate a quote: Get an instant CNC machining quote.

ABS is a great general purpose plastic for CNC machining as it has good machinability and dimensional stability. For applications that require low friction and high stiffness, POM would make a great choice. Other plastics can be good choices for applications that have more particular requirements such as specific mechanical or aesthetic properties.

Finishes suitable with CNC plastic machining include bead blasting and brushing 

It is very cost-effective and offers turnaround time due to the absence of mold

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