Polypropylene Machining and Fabrication

Polypropylene Machining and Fabrication

Ehren-Haus Industries machines and fabricates high quality custom polypropylene parts for industrial applications. We are registered with FDA for contract medical device manufacturing and medical relabeling and repackaging.

What is Polypropylene?

Polypropylene or PP is one of the most popular thermoplastic polymers used across the globe today. This polymer is non-polar, partially crystalline, and shares several properties of polyethylene. The mechanical and chemical properties of this material make it one of the common choices for several commercial and industrial use items.

Polypropylene is a lightweight material and exhibits high chemical resistance, radiolucency, and is highly autoclavable. All these properties make it an ideal choice for several medical applications including prosthetics, laboratory consoles and sinks, instrument caddies, and disposable syringes. Although the material assures excellent machinability and purpose, it is important to partner with an experienced polypropylene fabrication services provider to source your medical and commercial applications.

Learn More About the Properties of Polypropylene

What Sets Ehren-Haus Apart?

At Ehren-Haus, we have consistently invested in technology and resources, which has helped us meet all complex requirements with ease. We believe there is no one-size-fits-all approach that works well for everyone. Our experts have years of experience understanding this thermoplastic and its special properties. They understand all strengths and weaknesses of this material in typical applications, which helps them create performance-driven and high-quality polypropylene machined parts. This is why we excel at building custom-sized propylene parts for different applications.

What is Our Process?

Our experts work closely with clients to understand their requirements and the design files are accepted in CAD, IGS, and DXF formats. The design files are discussed with the client and design changes if required are suggested by our experts. The prototype building begins only after seeking approval.

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    Custom Polypropylene Fabrication Services

    At Ehren-Haus, we specialize in different types of plastic fabrication services. We regularly perform the following polypropylene fabrication techniques to build polypropylene parts.

    CNC Machining

    Our experts perform polypropylene machining to produce parts with precision. CNC plastic machining allows us to achieve strict tolerances and repeatability. The parts thus machined have been an integral part of several applications with stringent requirements.


    The polypropylene sheets are heated and molten plastic is poured into the mold to assign a specific shape. This technique requires no additional force and is quite popular with our clients.

    Vacuum Forming

    This is another variation of thermoforming technique, where a polypropylene sheet is draped over the mold and heated to form its shape. The hot sheet is vacuum sucked to form the shape and there is no air present in between. This formed sheet is removed from the mold and allowed to cool. Excess sheets on the sides of the mold can be trimmed. We can perform vacuum forming using female or male molds. If using the male mold, the sheet is usually placed on the mold. However, for the female mold, the sheet is placed inside the mold.

    Properties of Polypropylene

    The following propylene properties make them the most popular thermoplastics in the world today.

    Thermal Properties

    The homopolymer melts at 160 degrees to 165 degrees Celsius and a copolymer melts at 135 degrees to 159 degrees Celsius.

    Polypropylene Density

    Polypropylene is a lightweight polymer and is suited for applications that demand high strength and low weight. The homopolymer and random copolymer have a density range of 0.904-0.908 g/cm3.

    Machining Properties

    Polypropylene is semi-crystalline and can be easily machined to tight tolerances for meeting the stringent requirements of several medical industry applications. The material has a low annealing resistance and it may deform easily during annealing. At Ehren-Haus, we take special care to reduce the stresses caused due to heating during the annealing process. Our experts follow machine-controlled annealing to minimize the impact of heat on the part.

    Polypropylene Grades We Work With

    We work with the following polypropylene grades – homopolymer and copolymer.

    plastic material

    This is the most popular grade, which is made of a propylene monomer. This monomer is present in the semi-crystalline form, which makes it easy to machine.

    block copolymer
    Polypropylene Block Copolymer

    In this grade, the ethane content is much higher and co-monomer units are arranged in blocks. This regular pattern of block arrangement makes it more durable and reduces its brittleness than its random copolymer counterpart. The block copolymers are ideal for applications, which demand high strength.

    plastic material
    Polypropylene Random Copolymer

    This grade features polymers of propene and ethene. The ethene units take up to 6% of the total mass. The composition makes the polymer optically clear and flexible, thereby making it an ideal choice for applications where clarity may be required.

    Advantages of Using Polypropylene Parts

    Polypropylene machined parts are more popular than several other plastic parts due to the following reasons:

    Cost Effective

    Polypropylene is one of the cheapest thermoplastics available today, which makes it a popular choice for several commercial and industrial applications.

    Impact Resistance

    Polypropylene machined parts assure excellent impact resistance, which makes them an ideal choice for applications where vibrations or impact can be a big concern. The parts are more durable, and assure better crack resistance and stiffness than other plastic parts.

    Temperature Resistance

    These parts can resist high temperatures, which makes them ideal for applications where the equipment or machines may be exposed to challenging conditions.

    Vast Applications

    Being an FDA-approved material, the parts made of polypropylene can be used in food contact applications. However, the parts made of polypropylene homopolymer are more appropriate for this. Polypropylene machined parts are suited for applications where corrosion resistance may be required.

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