Two Strong Contenders in the World of Plastics
When selecting materials for industrial or consumer applications, nylon and Delrin® often top the list of options. These engineering-grade plastics are both known for their durability, versatility, and impressive mechanical properties. However, they have distinct qualities that make them each better choices for different applications. While nylon is celebrated for its toughness and flexibility, Delrin® excels in precision and chemical resistance.
Understanding the unique strengths and limitations of materials is key to choosing the right one. This guide will explore the mechanical properties, chemical resistance, and common applications of these two popular materials so you can make an informed decision.
Nylon: A Versatile Engineering Plastic
Nylon is best known for its exceptional tensile strength and flexibility. These qualities make it ideal for components like sheaves, gears, and bushings that must endure heavy, repetitive loads. In addition, nylon effectively absorbs shocks and vibrations, making it a preferred choice in high-stress environments like hoisting and pulley systems.
Certain environmental factors, particularly moisture absorption, can influence nylon’s performance. In humid conditions, nylon can swell, which may affect its dimensional stability. Despite this drawback, it remains a top choice for applications that require wear resistance and durability.
Chemical Resistance
Nylon is resistant to many hydrocarbons, oils, and lubricants, performing well in applications with mild chemical exposure. However, it is less effective against strong acids or bases and may require additional treatments to withstand harsher environments.
Top Applications
Nylon’s strength and flexibility make it suitable for a wide range of uses, including:
- Automotive components
- Industrial fasteners
- Consumer products
- Machine parts
While the material’s effectiveness may vary based on the given environmental conditions, its versatility ensures it can meet the demands of many industries.
Delrin®: High-Performance Acetal Resin
Delrin® is a type of polyoxymethylene (POM). This material is widely valued for its stiffness and high dimensional stability. Unlike nylon, Delrin® resists moisture absorption, allowing it to maintain its shape and mechanical properties over time. This makes it an excellent choice for precision parts that require steady performance.
Delrin® also features a low-friction surface, which allows it to operate smoothly in sliding or rotational mechanisms. This property expands its potential uses to industries where precision and reliability are paramount.
Chemical Resistance
Delrin® resists most solvents, oils, fuels, and weak acids. However, it may be affected by exposure to strong acids. This chemical resistance makes it a preferred material for environments where contact with corrosive substances is common.
Best Applications
Delrin® is an ideal material for the following applications:
- Bearings
- Pulleys
- Conveyor belts
- Fuel system components
- Medical devices
- Electrical insulation
Its ability to withstand chemical exposure and maintain dimensional stability under consistent loads makes it a standout choice for demanding environments.
Comparing the Two: Nylon vs. Delrin®
When comparing nylon and Delrin®, both materials bring distinct advantages. On the one hand, nylon’s flexibility and impact resistance make it ideal for load-bearing components like sheaves, gears, and bushings. However, its susceptibility to moisture absorption can compromise its performance in humid conditions.
Conversely, Delrin® offers superior rigidity, dimensional stability, and low friction, which is essential for precision parts like bearings and pulleys. Additionally, its higher chemical resistance allows it to perform reliably in chemically intensive environments.
Mechanical Properties Overview
| Property | Nylon | Delrin (POM) |
|---|---|---|
| Tensile Strength | 12,000 psi | 10,000 psi |
| Elongation at Break | 300% | 150% |
| Flexural Modulus | 2.6 - 3.0 GPa | 2.4 GPa |
| Hardness (Rockwell M) | 82 | 90 |
| Friction Coefficient | 0.2 - 0.3 | 0.2 - 0.3 |
| Wear Resistance | High | Very High |
| Machinability | Good | Excellent |
| Thermal Stability | Up to 223 °C (Nylon 6) | Up to 180 °C |
Choose the Right Material for Your Needs at W.S. Hampshire
Choosing whether you need nylon or Delrin® ultimately depends on your specific application’s needs. For components requiring flexibility, shock absorption, and wear resistance, nylon is an excellent choice. If your application demands dimensional stability, low friction, and chemical resistance, Delrin® is likely a better option.
W.S. Hampshire, Inc. provides high-quality materials tailored to your project’s needs. Our team of experts can guide you in selecting the best plastic for your application, whether that’s nylon, Delrin®, or another advanced material. You can trust us to deliver durable and reliable solutions that meet the demands of your industry.
Contact us today to find the perfect material for your next project.