What is thermoplastic compounds and Why Do We Use Them?

Thermoplastics Explained

Thermoplastics have revolutionized modern industries with their adaptability, durability, and wide range of applications. These versatile polymers offer engineers and designers materials that can be molded and reshaped repeatedly without altering their chemical properties.

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Piedmont Plastics supplies various thermoplastic materials for countless applications across the construction, automotive, medical, and consumer goods sectors. Understanding the technical aspects of thermoplastics will help you make informed decisions about material selection for your specific needs.

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What Are Thermoplastics?

Thermoplastics are polymers that become pliable or moldable at elevated temperatures and harden upon cooling. This heating and cooling cycle can be repeated multiple times without changing the material’s chemical structure, making thermoplastics unique for their recyclability and versatility.

Thermoplastics' molecular structure— chains of repeating units held together by weak intermolecular forces—enables them to be reshaped and reused. Unlike thermosetting plastics (thermosets), which cannot be remolded after the curing process, thermoplastics can be repeatedly melted and reformed, making them an ideal choice for sustainable manufacturing.

Thermoplastics Available at Piedmont Plastics

At Piedmont Plastics, we offer a wide selection of thermoplastics, each with specific properties tailored to different industries. Here are some of the key thermoplastic materials available:

Polycarbonate

Polycarbonate is a high-performance thermoplastic known for its exceptional impact resistance, optical clarity, and heat resistance. Its ability to withstand extreme conditions makes it ideal for safety shields, automotive headlamp lenses, greenhouse panels, and industrial machinery guards. Polycarbonate's ability to maintain structural integrity in both low and high temperatures makes it a favored material in demanding environments.

Technical Specs Impact resistance: 250 times stronger than glass Heat resistance: Usable up to 135°C (275°F) Recyclability: Polycarbonate is recyclable, but it requires careful sorting to remove additives like UV stabilizers.

Acrylonitrile Butadiene Styrene (ABS)

ABS is known for its toughness, lightweight properties, and ease of processing. It is widely used in automotive components, electronics housings, and consumer products due to its excellent impact resistance and dimensional stability. ABS can withstand mechanical stress without cracking or breaking, making it ideal for structural applications.

Technical Specs Tensile strength: 40 MPa (Megapascal) Heat deflection temperature: 90-100°C Impact strength: Moderately high, ideal for automotive interiors and consumer electronics

Acrylic

Acrylic, known as polymethyl methacrylate, is a transparent thermoplastic with superior optical clarity. It is often used as a lightweight, shatter-resistant alternative to glass in applications like windows, displays, aquariums, and signage. Acrylic is UV-resistant and retains its clarity over time, making it suitable for outdoor applications.

Technical Specs Light transmittance: 92%, which exceeds that of glass Impact resistance: 10 times stronger than glass, though less durable than polycarbonate Weather resistance: Acrylic is highly resistant to yellowing and maintains clarity under prolonged UV exposure.

PETG

PETG combines the durability of PET with the flexibility and easy processing of glycol modification. It is commonly used in medical packaging, food containers, and 3D printing applications. PETG is FDA-approved for food contact and is resistant to many chemicals, making it a preferred material for medical devices and consumer packaging.

Technical Specs Chemical resistance: Resistant to alcohols, acids, and diluted bases Heat resistance: Up to 70°C (158°F) Impact resistance: Higher than acrylic but lower than polycarbonate, suitable for moderate-load applications

Nylon

Nylon is valued for its toughness, flexibility, and excellent abrasion resistance. It is commonly used in automotive components, mechanical gears, and textiles. Nylon’s ability to absorb impact and resist wear makes it ideal for high mechanical strength applications.

Technical Specs Tensile strength: Up to 85 MPa Heat deflection temperature: Up to 180°C (356°F) in certain grades Abrasion resistance: Extremely high, ideal for gears, bearings, and high-wear components

Advantages and Considerations of Thermoplastics

Advantages:

Thermoplastics provide a range of benefits that make them suitable for various industries.

Recyclability

The ability to be reshaped and reused multiple times without losing mechanical properties makes thermoplastics an environmentally friendly choice. Many thermoplastics, such as PETG and polycarbonate, can be recycled, reducing material waste and supporting sustainable manufacturing practices.

Impact Resistance

Many thermoplastics, including polycarbonate and ABS, offer high impact resistance, making them ideal for applications requiring toughness and durability. Polycarbonate, for example, is 250 times stronger than glass, which makes it an excellent choice for safety applications.

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Versatility in Design

Thermoplastics can be molded into complex geometries, allowing creative design freedom. This particularly benefits automotive and consumer goods industries, where lightweight, durable, and intricately shaped components are necessary.

Cost-Efficiency in Production

Thermoplastics are well-suited for high-volume, low-cost manufacturing processes, including injection molding and extrusion. This efficiency helps lower production costs while maintaining excellent precision in part fabrication.

Limitations:

However, there are also limitations to thermoplastics:

Heat Sensitivity

While thermoplastics like polycarbonate offer excellent heat resistance, others may soften or deform at lower temperatures, limiting their use in high-temperature applications. PETG, for instance, begins to lose structural integrity above 70°C.

UV Degradation

Prolonged exposure to UV light can cause certain thermoplastics, such as polycarbonate, to turn yellow or become brittle over time, though UV-resistant coatings can mitigate this issue.

Chemical Sensitivity

Some thermoplastics are more resistant to chemicals than others. Polycarbonate can be degraded by exposure to certain solvents, while PETG and acrylic offer better chemical resistance.

Need Further Assistance?

Thermoplastics offer many properties that make them essential materials in today’s industries. Thermoplastics provide the versatility and performance necessary to meet these demands, whether you need high-impact resistance, chemical stability, or optical clarity. From construction to automotive and electronics, our team of experts is ready to help you choose the right thermoplastic for your application.

As we all know, plastic is everywhere. It’s in millions of products performing millions of functions for billions of people. From laundry baskets, to artificial joints in the human body, plastic performs and infinite number of functions. Plastics are polymers and there are a surprisingly few distinct polymer materials in the world when compared to the vast number of end uses for plastic. So how does plastic work well in millions of applications when there are only a few dozen plastic polymers? The answer is thermoplastic compounding.

Thermoplastic compounding makes basic polymers work better. Thermoplastic compounding is a process in which base polymers are mixed with other materials to make the base material behave differently. Compounding enhances the properties of base polymers by adding other materials to them.

All this work of making polymers better takes place in an extrusion machine. Most compounding companies (including PolyVisions) use machines called twin screw extruders. These machines consist of two heated screws that melt, mix and propel plastic materials. The base polymer (usually in pellet form) is put in the extruder and melted and propelled forward inside what is called the barrel of the extruder. Other materials (generally referred to as additives) which modify the behavior of the base polymer are added along the length of the barrel and mixed in to the base polymer. By the time the materials reach the end of the barrel they are fully mixed and are then turned back into plastic pellets ready to be used to make end products.

Putting additives into thermoplastic polymers can enhance many properties including; color, impact strength, flexibility, heat and cold resistance, UV resistance, electrical conductivity, tensile strength, lubricity ad countless other characteristics. Additives may include; pigments, glass fibers, carbon nano particles, flame retardants, lubricants, other polymers, elastomers, nucleating agents, fillers, etc….

PolyVisions is a leader in reactive compounding. In this process we are able to create a chemical reaction in our twin screw extruders to produce what is called a grafted polymer. Grafted polymers are similar to co polymers in that the materials are not simply blended together, they are actually bonded to each other at the molecule level. This results in much more radical and unique property transformation of the base material. This reactive extrusion process creates a stable morphology that not only can act as an interfacial compatibilizer but also retains many of the inherent thermal and mechanical properties of the base polymers. Because the materials are molecularly bonded to each other they tend to behave with more consistency than simple blends in processing like film and sheet extrusion, thermoforming and injection molding. PolyVisions takes polyester, nylon, polyurethane, polyethylene and other materials and grafts other polymers to them to create unique new materials.

PolyVisions uses co rotating twin screw extruders to melt, mix, propel and pelletize thermoplastic materials. If you are using a thermoplastic material that needs enhanced properties, call us!

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