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Polypropylene Machining: Material Properties and Uses



There are hundreds of plastics suitable for CNC machining processing, but polypropylene material accounts for 10% of use, second only to PVC. The outstanding feature of polypropylene is the resistance to bending fatigue (7*10^7) times of folding and bending without damage marks.


Soft plastic materials, when machined, tend to heat up and cause deformation, so our machinists use spindle speed 15000-18000, feed rate 3000-5000, and carbide or high-speed steel(HSS) for tools in polypropylene machining.

Learn More Polycarbonate Material



What is Polycarbonate


Polypropylene(PP) is a thermoplastic resin, a polymer made of propylene through a polymerization reaction. As one of the lightest of the commonly used plastics, it is easy to machine and surface treat, and also has resistance to wear and tear, chemical resistance, and favorable economic conditions.




Advantages of Polypropylene Material


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Lowest density

Polypropylene is the least dense of all synthetic resins, at 0.90g/cm3, only 60% of the density of PVC materials. With higher flexibility can also reduce the overall weight of the product.

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Best heat resistance

PP materials heat resistance is the best, -30 ℃ to 140 ℃ for a long time work will not be deformed. It can be used to make utensils for heating food.

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Polypropylene is more affordable than other high-performance plastics such as Polycarbonate and Acrylic (PMMA), which can save you money.

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Softening point is close to the melting point

Polypropylene is a crystalline polymer and its particles will only melt at a fixed temperature, unlike Polyethylene or PVC, which soften as the temperature increases during heating.




Best Solution for Polypropylene Parts



Polypropylene parts are able to withstand more load and less fatigue damage due to the higher crystallinity and lower defect density in its molecular structure; it also reduces minor defects and damage within the material.


Then have you considered which of your products' problems can be solved by this feature of it? Please leave these things to Tuofa, we will choose the right material according to your project, and completing the order is just the beginning of our value creation for you!



Custom Polycarbonate Parts Quote



Polypropylene Material Properties


Items Test condition Test method Test data Unit
Basic performance Density   ASTM D1505 0.9 g/cm3
Water imbibition After 24 hours ASTM D570 0.02 %
Mechanical properties Notched impact strength 23°C(73.4F) ASTM D256A 2.6
Tensile yield strength   ASTM D638 10 %
Elongation at break   ASTM D638 360 Kg/cm2
Rockwell hardness   ASTM D758A 97 R scale 
Thermal performance Bending modulus   ASTM D790B 17500 Kg/cm2
Melting point   ASTM D648 170



Polypropylene Uses


Polypropylene material is widely used in the production of medical devices, automobiles, bicycles, parts, conveying pipes, chemical containers, etc. It is also used for food, drugs and garments. CNC machined polypropylene parts can be manufactured including:


Machine cases




Bolts and nuts

Handles and knobs


Pipe parts(Valves)





Custom Polypropylene Parts Display


Choose Tuofa's custom polypropylene parts. In our precision 5-axis CNC shop, engineers precisely control the parameters and tool paths of CNC machines, resulting in high-precision part machining.







People Also Ask


Polypropylene vs Polycarbonate


1. Difference in appearance: polypropylene material will be at a relative disadvantage, from the appearance, polycarbonate is not glossy enough and is a translucent material; while polycarbonate has a higher light transmission rate and is close to transparent.

2. The difference in application: Because of better flexibility and durability, polypropylene material is suitable for manufacturing ski, surfboard, medical equipment, body parts, etc. polycarbonate strength and stiffness is higher, suitable for car lampshades, structural parts, electronic products shell, safety helmets, protective gear.

3. The difference in cost: polycarbonate is more expensive, 1 ton of polycarbonate material price is equivalent to 2 tons of polypropylene material price.


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