Polymers in Medical Devices: Resins Shaping Modern Healthcare

Polymers in Medical Devices: Resins Shaping Modern Healthcare

In healthcare, the materials used serve as a vital influence on the quality of care for patients and the costs they pay. Modern medical device manufacturing advancements hinge primarily on the revolution of polymer resins.

Polymer resins are a class of synthetic organic compounds. In manufacturing, it’s polymer resins adaptability for complex shaping that makes them a viable component. As polymer science evolves, the medical industry is increasingly leveraging its power.

Let’s dive deeper into the role of polymer resins in the medical field.

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From PC to Nylon 66: Understanding Polymer Resin Applications in Construction

From PC to Nylon 66: Understanding Polymer Resin Applications in Construction

The evolution of construction has an obvious, and essential, relationship with the materials it uses. Throughout history, available materials have shaped the way construction has progressed. From the mud bricks of ancient Mesopotamia to the steel beams of modern skyscrapers, we see it everywhere around us, all throughout history.

Today, we aren’t using mud bricks. Instead, materials such as polymer resins are emerging as materials used to create rigorously strong, safe, and cost-effective construction.

From the durability of Polycarbonate (PC) to the versatility of Acrylonitrile Butadiene Styrene (ABS), polymers offer benefits that many legacy materials can’t compete with.

From the inception of a working construction project to the final touches, we’ll explore how essential polymer resins help us build for a better future.

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Top 5 Benefits of Using Engineering Resins in Electronics Manufacturing

Top 5 Benefits of Using Engineering Resins in Electronics Manufacturing

Materials make all the difference, particularly in the competitive electronics industry. If the product’s core suffers from poor quality, design and functionality may falter. And that can lead to poor usability for consumers, and we know where that goes.

Engineering resins are a class of polymers with superior mechanical and thermal properties. The electronics industry leverages engineering resins in numerous and extensive aspects of their manufacturing. 

In today’s blog post, we’ll examine five benefits to using engineering resins in electronics manufacturing. 

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Introduction to Polymer Resins: A Basic Guide

Introduction to Polymer Resins: A Basic Guide

The world of polymer resins is vast and sometimes confusing. But it’s our world, and today we’ll explain the basics: what polymer resins are and how we use them.

What Are Polymers?

Did you know polymers surround you every day? Before we get to polymer resins, let’s start with polymers themselves. Polymers are large molecules made of smaller, repeating units called monomers. These monomers link together in chain-like structures, often forming complex three-dimensional networks.

The interesting part: polymers are a critical component of many everyday materials. They can be as elastic as rubber or as rigid as plastic. Where do we find them?

  • Household products: furniture, toys, carpet, and electronics all contain polymers. Clothing often uses synthetic fabrics derived from polymers.
  • Packaging: from the boxes on your doorstep to the bubble wrap the kids love, polymers are everywhere in packaging.
  • Automobiles: polymers appear in seatbelts, fuel tanks, airbags, tires, and many other parts.
  • Construction: polymers are used in pipes, insulation, flooring, roofing, windows, and doors.
  • Medical: polymers are common in medical and surgical equipment and can make sterilization more efficient.

There’s more, but let’s get back to our subject and pick up engineering resin use cases later.

So, What Are Resins?

Now let’s add resins to the picture. Resins are a subset of polymers: viscous substances that can harden permanently, which makes them vital for creating durable materials. They come in two forms, natural (think plants) and synthetic (think chemical processing). We keep this short here because we cover natural and synthetic resins in depth in our Essential Guide to Resins. For this guide, the key point is how resins fit into the polymer family and what makes engineering resins special.

There are three broad categories of polymer resins:

  • Thermoplastic Resins: can be heated and cooled repeatedly without harming their properties. Because the process is repeatable, they are recyclable. Examples include polyethylene (PE), polyvinyl chloride (PVC), and polystyrene (PS).
  • Thermosetting Resins: undergo a chemical reaction when heated that permanently hardens them. The process cannot be reversed, so they are used where higher durability is required.
  • Elastomers: a polymer resin type with high elasticity. They stretch and return to their original shape. Think rubber.

Because of their diverse properties, polymer resins are used extensively in manufacturing, packaging, automotive, construction, and healthcare.

So, Is a Resin a Polymer?

Yes. A resin is a type of polymer. Polymers are large molecules made of repeating structural units joined by covalent bonds, and resins are a subset of those: viscous substances derived from natural or synthetic sources. Put simply, all resins are polymers, but not all polymers are resins.

Synthetic resins are man-made polymers. They are common in industrial and commercial applications, in materials such as polycarbonate (PC), acrylonitrile butadiene styrene (ABS), and acrylonitrile styrene acrylate (ASA).

Polymers, resins, and engineering resins hierarchy

Resin Properties: What Sets Them Apart

Resin properties describe how a resin performs: its strength, heat resistance, flexibility, chemical resistance, and dimensional stability. These properties determine which resin fits which job. The ones engineers look at most:

  • Mechanical strength and stiffness: how much load a resin can bear without deforming.
  • Thermal resistance: how well a resin holds up to heat, important for under-the-hood and electronics uses.
  • Chemical resistance: how well it withstands solvents, fuels, and other chemicals.
  • Flexibility and impact resistance: how well it absorbs stress without cracking.
  • Dimensional stability: how well it keeps its shape over time and temperature.

Engineering resins stand out because they are tuned for superior mechanical and thermal properties compared with commodity plastics.

Why engineering resins, key properties and application areas

Engineering Resins: The Main Course

Of course, we’d be remiss not to discuss thermoplastic polymers, more widely known as engineering resins. That’s our expertise. Polymer resins are the broad term; engineering resins are a more specific group of thermoplastic polymers with superior mechanical and thermal properties compared with commodity plastics. They are used in demanding applications thanks to their strength, temperature resistance, and durability.

Engineering Resin Uses

  • Industrial equipment: used in bearings, gears, and other critical moving parts to reduce friction and add stiffness.
  • Aerospace: PEEK is used for its low weight and high strength-to-weight ratio, often in aircraft interiors and cable insulation.

Automotive Industry and Engineering Resins

Engineering resins, including polyamides (nylons), are used in under-the-hood automotive applications for their ability to withstand high heat and harsh chemicals, in components like radiator end tanks, air intake manifolds, and engine covers. Engineering thermoplastics are increasingly central to the electric vehicle revolution, including in batteries and components. ABS/PC blends are widely used for their balanced toughness and heat resistance.

Construction Industry and Polymer Resins

Polymer resins have changed the way we build. From early stages through final details, they provide strong, durable results. Modified polymer resins serve as binders in polymer concretes: isophthalic polyester polymer concrete offers rapid hardening and acid resistance, and epoxy polymers are increasingly used to repair and retrofit concrete structures. PC/ABS offers load capacity that helps build gear mechanisms.

Polymer Suppliers and Why We’re Critical

Without polymer suppliers, distributing polymers and maintaining quality control would be chaotic. Suppliers produce and distribute raw polymers, resins, additives, and more, playing a crucial role in supply chains across plastics, rubber, construction, automotive, and medical devices.

We hope this guide helped level-set a complex but remarkable industry. Got questions? Contact us at info@prlresins.com or learn more about Polymer Resources.

Frequently Asked Questions

What are polymer resins?

Polymer resins are polymers in a form that can harden into solid materials. They include thermoplastics, thermosets, and elastomers, and they are used across manufacturing, packaging, automotive, construction, and healthcare.

Is a resin a polymer?

Yes. A resin is a subset of polymers, a viscous substance made of repeating molecular units that can come from natural or synthetic sources. All resins are polymers, but not all polymers are resins.

What is the difference between thermoplastic and thermosetting resins?

Thermoplastic resins can be melted and reshaped repeatedly, which makes them recyclable. Thermosetting resins harden permanently and cannot be remelted, which suits high-durability uses.

What are engineering resins?

Engineering resins are thermoplastic polymers with superior mechanical and thermal properties compared with commodity plastics. They are used in demanding automotive, aerospace, electronics, and medical applications.

UL Listings

UL 94 Listings

UL 94 is the flammability standard which determines a material’s likelihood to either spread or put out a flame once the material has been lit on fire. The UL 94 testing can present a variety of determinations including hourly fire resistance ratings, surface burning characteristics, roof covering flammability ratings and flammability of contents within a structure. The testing is done on a small scale to evaluate the flammability of the plastic used in various parts under controlled conditions. There are three types of UL 94 ratings we typically use:

HB Rating

  • Samples are place horizontally and ignited
  • The flame must burn slowly across the sample V (V-0, V-1, or V-2) Rating
  • Samples are placed vertically and ignited
  • The flame must extinguish within specific time frames and not drip material

5V (5VA or 5VB) Rating

  • Samples tested both vertically and horizontally
  • The flame must burn slowly across the sample V (V-0, V-1, or V-2) Rating
  • Samples are placed vertically and ignited
  • Five applications, 5 seconds on, 5 seconds off

UL 746B Listings

UL 746B is the standard for long term property evaluations which determines a material’s thermal aging. This test is used to determine the ability for the tested material to retain its properties after extensive exposure to high temperatures. UL 746B includes a variety of components including dielectric, tensile and impact testing. The RTI or relative temperature index is assigned beforehand, based on the material’s specific application. The RTI comparison from before the testing and after is used to determine thermal aging over a period.

There a several types of RTIs given based upon the material application:

  • Electrical RTI
  • Mechanical Impact RTI
  • RTI Elongation
  • Mechanical Strength RTI

UL 746C Listings

UL 746C is the standard for UV and water testing. This type of testing is suitable for materials that are meant to be used in an outdoor application. To test UV, the material is either put into a twin-enclosed carbon weatherometer for 720 hours, or a xenon-arc weatherometer for 1000 hours. To test whether the material can withstand water exposure, it is immersed into water for 7 days at 70°C. There are two types of UL 746C Ratings:

F1 Rating

  • The material has passed both the water and UV testing.

F2 Rating

  • The material has passed either the Water or UV testing but not both
  • The material has only been partially tested

About Polymer Resources

Headquartered in Farmington, Conn., Polymer Resources is a leading, privately owned U.S. supplier of high-quality customized specialty engineering resin compounds, color-matching services and related materials technology solutions for the electrical, medical, consumer goods, business equipment and automotive industries. Operating with an extensive list of UL approved products, it is one of very few polymer suppliers that backs its compounding and color match services with a quality guarantee. The company’s commitment to customer service, financial discipline, and foresight for over 45 years has made it a reliably steady resource for specialty compounds in the often-volatile plastics industry. With operations in Farmington and Rochester, N.Y., Polymer Resources continues to fuel its growth through ongoing investments in its manufacturing assets and its top industry talent. The company’s direct sales force and local warehousing throughout the United States enable on-time delivery and fast, local customer service anywhere in the country.

For more information, visit www.prlresins.com

Structural Foam Molding – Working with Complicated Designs

Structural Foam Molding – Working with Complicated Designs

For products which require a softer inner core and a hard outer surface, Structural foam molding guarantees tough and reliable wall sections. This type of molding process is generally used for medium to high volume production and produced on injection molding machines where a foaming agent is used to produce thick internal wall sections.

Depending on the processing method and the application, there are wide varieties of Polycarbonate plastic available in the market. There are different blends of Polycarbonate PC like ABS, Polyesters etc. which are normally used in the automotive industry. There are various processing methods associated with Polycarbonate which includes Injection molding, Vacuum forming, Extrusion, Structural foam molding and Blow molding.

Typically used for applications or products where the goal is to reduce the component weight and tension in the material needs to be avoided, Structural foam molding allows the designer to work easily with complicated designs because the material thickness can be varied between 4 and 10 mm, allowing for diverse designs. A high level description of the structural foam molding process includes use of an injecting propellant which creates the material structure with consistent shape and design throughout the product.

Among several advantages associated with Structural foam molding, one of the most interesting aspects is its ability to make lightweight yet extremely durable and strong products. However, one also needs to be aware that the product surface needs to be painted for a better visual appearance. The superior strength to weight ratio and the use of low pressure allows a wide range of flexible and complex designs, thereby making this process extremely popular.

The process involves use of a small amount of chemical blow agent inside the plastic material which makes the internal walls thicker. When the melted plastic gradually enters the mold cavity, foaming would create a plastic wall that solidifies into a great molding wall. This versatile process can be easily used with any thermoplastic which can be injection molded. The large plastic products have a solid skin and a cellular inner structure while keeping the weight lower which makes it a favorite for vehicles, sports equipment and aircraft.

The Process

Structural foam molding needs Nitrogen to be injected into the melt before it is injected into the mold. Once the solid wall is created, the core is retracted so that the pressurized gas can expand and create a uniform cellular structure. Used with most thermoplastic materials, the process allows for weight reduction without compromising on its high rigidity features. The molded material doesn’t warp and also there are no sink marks because of the dense skin and rigid core.

The dimensional stability and high impact strength allows for great processing flexibility. The structural foam molding process creates molded parts with a smooth and solid surface on the outside and a foam structure on the inside.