Sofia Martinez
ABS (acrylonitrile butadiene styrene) and PC (polycarbonate) are two of the most widely used industrial thermoplastics. They are versatile and reliable, with a range of unique properties that make them ideal for specific applications. ABS is a blend of three plastics, while PC is a thermoplastic polyester. Both materials offer high impact resistance and are commonly used in applications where durability is essential, such as hard-sided luggage, electrical enclosures, and machine guards. However, they differ in properties such as chemical resistance, UV resistance, heat resistance, and processing ease. ABS is known for its affordability and customizability, while PC offers higher flexibility and superior tensile strength.
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What You'll Learn
ABS and PC are both thermoplastics
ABS (acrylonitrile butadiene styrene) and PC (polycarbonate) are both thermoplastics that are widely used in manufacturing. They are versatile and reliable, with applications ranging from pipes and tubes to medical equipment and luggage. They can sometimes be used interchangeably, but there are also key differences between them that make one more suitable for specific projects.
ABS is a copolymer made from the polymerization of acrylonitrile, butadiene, and styrene monomers, each contributing unique properties to the material. Acrylonitrile provides chemical resistance and hardness, butadiene adds toughness and impact strength, while styrene gives the material a shiny, impervious surface. ABS is known for its resistance to various substances, including acids, alkalis, alcohols, and salts, but it is susceptible to damage from concentrated sulfuric and nitric acids, ketones, and hydrocarbons. It also has poor UV resistance, leading to discoloration and reduced durability over time. However, ABS offers excellent durability, scratch resistance, and is well-suited for electroplating due to its additional strength.
PC, on the other hand, is a polymer derived from the reaction of bisphenol A and phosgene gas. It can also be made through the reaction of bisphenol A with diphenyl carbonate in a process called transesterification. PC is a lightweight, transparent thermoplastic with impressive mechanical properties. It is extremely durable, highly resistant to impact and fracture, and has high tensile strength. PC is 250 times stronger than glass while being significantly lighter and more durable. It also exhibits high heat resistance, fire resistance, insulating properties, and ease of machining. PC is available in multiple colors and is commonly known by brand names such as Lexan, Makrolon, or Palgard.
When compared directly, PC offers better heat deflection and tensile strength than ABS, but ABS provides better ductility, processability, and aesthetics. The combination of ABS and PC, known as PC-ABS, blends the advantages of both materials, resulting in a hybrid plastic with exceptional strength, durability, and ease of processing. PC-ABS is widely used in the automotive, electronics, and 3D printing industries, offering improved moulding characteristics and cost-effectiveness compared to using polycarbonates alone.
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ABS is a blend of three plastics
Acrylonitrile butadiene styrene (ABS) is a common thermoplastic polymer. It is a blend of three plastics, or more specifically, a blend of three monomers: acrylonitrile, butadiene, and styrene. Each monomer contributes unique chemical properties, and within the ABS molecule, they synergistically create a robust and versatile material.
ABS is a terpolymer, a sophisticated material engineered by the precise combination of its three distinct monomers. The proportions can vary from 15% to 35% acrylonitrile, 5% to 30% butadiene, and 40% to 60% styrene. The result is a long chain of polybutadiene crisscrossed with shorter chains of poly(styrene-co-acrylonitrile). The nitrile groups from neighbouring chains, being polar, attract each other and bind the chains together, making ABS stronger than pure polystyrene.
The acrylonitrile in ABS provides chemical and thermal stability, the butadiene adds toughness and strength, and the styrene gives the finished polymer a nice, glossy finish. ABS has a low melting point, enabling its easy use in injection moulding and 3D printing. It also has high tensile strength and is very resistant to physical impacts and chemical corrosion.
ABS plastic is used in a wide range of applications, from computer keyboard keys to Lego, and from medical devices to automotive parts. It is easily moulded, sanded and shaped, and its glossy surface finish is compatible with a wide range of paints and glues. It is also commonly used outdoors, as it stands up well to rain, storms and winds, although it must be protected from UV rays and extreme weather conditions.
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PC is a type of thermoplastic polyester
Polycarbonate (PC) is a type of thermoplastic polyester with many industrial applications. It is commonly used in projects requiring CNC machining, injection moulding, and 3D printing. PC is known for its impressive mechanical properties, including high tensile strength, impact resistance, and flexibility. It is 250 times stronger than glass, yet significantly lighter and more durable. Polycarbonate is also highly resistant to heat, fire, and certain chemicals. It can undergo large plastic deformations without cracking or breaking, making it valuable in prototyping applications.
PC is typically made through a chemical reaction between phosgene gas and bisphenol A (BPA). However, it can also be produced through the reaction of BPA with diphenyl carbonate in a process called transesterification. Polycarbonate products may contain the precursor monomer BPA, which has been the subject of health concerns.
PC is often used in combination with other materials, such as acrylonitrile butadiene styrene (ABS), to enhance its properties. The blend of PC and ABS combines the toughness and heat resistance of PC with the ductility, processability, and aesthetics of ABS. This blend is widely used in the electronic, automotive, and telecommunications industries due to its improved processing during injection moulding and cost-effectiveness.
Polycarbonate has found applications in various industries, including medical devices, electronics, and manufacturing. It is used in medical applications due to its compliance with ISO 10993-1 and USP Class VI standards, making it suitable for sterilisation. In electronics, polycarbonate is used in the production of compact discs, DVDs, and smartphone components. Its transparency and electrical non-conductivity make it valuable in prototyping.
PC is also known for its optical properties, with some grades being optically transparent. This transparency, along with its high melting point, makes it suitable for injection moulding into various shapes, such as tubes, rods, and sheets. These sheets have applications in advertisement, such as signs, displays, and poster protection. Overall, polycarbonate's versatility, durability, and unique properties make it a widely used material in various industries.
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ABS and PC have different applications
Acrylonitrile butadiene styrene (ABS) and polycarbonate (PC) are two of the most widely used industrial materials. Both are versatile and reliable, with a range of applications. However, they have distinct differences and are not always interchangeable.
ABS is a sturdy, lightweight, and ductile plastic. It is easily machined and has good resistance to chemicals, impacts, and abrasions. It is also heat-resistant and fully recyclable. ABS is often used as a replacement for metal in the automotive industry, for parts such as dashboard components, seat backs, and handles. It is also used for piping and fittings in buildings, as well as for vacuums, and in electronic applications, including computer keyboards and printer parts. In addition, ABS is used for musical instruments, such as recorders, flutes, and percussion instruments.
PC is a thermoplastic polyester known for its impressive mechanical properties. It has good resistance to ultraviolet (UV) radiation and is an excellent electrical insulator. It is also lightweight and impact-resistant. PC is used in a wide range of applications, including automotive components, such as headlight lenses and sunroofs. In the electronics industry, it is used for electrical insulators, connectors, and LED light covers. PC is also used in medical devices, such as incubators and surgical instruments, and in consumer products, including water bottles and food containers. In addition, PC's UV resistance makes it suitable for greenhouse panels and protective covers for outdoor equipment.
While both ABS and PC have their own unique applications, they are sometimes combined to form a PC/ABS alloy. This blend provides higher impact resistance and easier processability than either material alone. PC/ABS alloys are used in the automotive industry for internal components and in electronics housings, TV frames, and mobile devices.
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ABS and PC have different chemical resistances
ABS (acrylonitrile butadiene styrene) and PC (polycarbonate) are two of the most widely used industrial thermoplastics. They are used in a variety of applications, from pipes and tubes to medical equipment and luggage. While they share some similarities, they also have distinct differences in their properties, applications, and costs. One of the critical differences between ABS and PC lies in their chemical resistance capabilities.
ABS plastic is known for its resistance to a broad spectrum of substances. It effectively resists acids, alkalis, alcohols, and salts. However, ABS has its limitations and can be susceptible to damage when exposed to certain concentrated acids, such as sulfuric and nitric acids. Additionally, ABS is vulnerable to ketones, aromatics, chlorinated hydrocarbons, and esters. ABS also exhibits sensitivity to UV rays, resulting in discoloration and reduced durability over time. To mitigate this issue, UV stabilizers can be incorporated into the ABS mix.
On the other hand, PC (polycarbonate) offers exceptional resistance to mineral acids, numerous organic acids, and various alcohols. It also demonstrates impressive resistance against oxidizing and reducing agents. However, unlike ABS, polycarbonate is not resistant to solvents, aromatics, or alkaline substances.
The choice between ABS and PC depends on the specific requirements of a project. If a project demands toughness, heat resistance, and resistance to mineral and organic acids, PC is the preferred choice. However, if ductility, processability, and aesthetics are more important, ABS may be more suitable. In some cases, a blend of ABS and PC is used to combine the advantageous properties of both materials, as seen in applications within the electronic, automotive, and telecommunications industries.
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Frequently asked questions
ABS (acrylonitrile butadiene styrene) and PC (polycarbonate) are two of the most widely used thermoplastics. They are both versatile and reliable and can sometimes be used interchangeably.
ABS is a blend of three different types of plastics: acrylonitrile, butadiene, and styrene. Each brings a different durability factor to the table. Acrylonitrile offers superior hardness and resistance to chemicals, butadiene holds up well upon impact, and styrene is resistant to heat. ABS is opaque but can be produced in a variety of colours. It is also more affordable than PC.
PC is a type of thermoplastic polyester known for its impressive mechanical properties. It is lightweight, transparent, extremely durable, and highly resistant to impact and fracture. PC is 250 times stronger than glass but significantly lighter and more durable. It is fire-resistant, has insulating properties, and is easy to machine. PC also exhibits high heat resistance and is available in multiple colours.
Both ABS and PC offer a high level of impact resistance and are common in applications where durability is a must. They are both popular in the production of hard-sided luggage, electrical enclosures, and machine guards.
The choice between ABS and PC depends on the specific requirements of your project. ABS is ideal when you need a balance between rigidity and resilience, excellent durability, and scratch resistance. PC is a better option when you require higher flexibility, tensile strength, and superior hardness and chemical resistance.
