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The following article was published in our article directory on June 9, 2016.
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Plastic Fasteners Used in the Military

Article Category: Business

Author Name: Eric Lenz

U.S. Military Applications Demand Plastic Fasteners ...In Some Applications

As you can imagine, the demands of the military and the environments in which the military works can be hard on machinery and components. The United States Navy is especially hard on equipment, bearings, screws, and more due to its operate in humid and consistently wet environments. Metal commonly corrodes, so metal fasteners may not be the best choice for all applications. Enter plastic fasteners.

Hold on. Not all plastic fasteners are right for the job, however.

Let's review two superior options, when it comes to getting the highest performance out of a plastic material that's needed in the military applications: Acetal and DuPont's Acetal resin, called Delrin.

Acetal and Delrin.

Both Acetal and Delrin are thermoplastics. Acetal and Delrin are both suitable for use in a wide variety of applications that demand sliding actions.

Delrin or Acetal?

Acetal and Delrin are very similar, but there are some differences that are extremely important to keep in mind, especially in a military setting. Delrin is a homopolymer. Acetal, on the other hand, is a semi-crystalline, non-amorphous thermoplastic. Say that three times fast.

Delrin, the homopolymer Acetal, has a high crystallinity, which is able to increase the mechanical strength and creep resistance of the material. It is also generally resistant to a wider range of solvents and common chemicals than Acetal, which can be helpful in military applications. Additionally, it is capable of avoiding corrosion, like rusting and dezincification, which implies it is a good choice for displacing traditional metal components.

There are other factors to consider, that make Delrin a good choice when it comes to the Navy and the military as a whole. Delrin has a higher melting point than Acetal at 175 degrees Celsius, while Acetal's melting point is, at the very most, 173 degrees Celsius. Two degrees is certainly not substantial, but worth noting.

Delrin AF integrates 10 to 25 percent PTFE fluorocarbon fibers that are dispersed in the thermoplastic resin, while Acetal does not. This allows the material to retain the strength, toughness, and dimensional stability of Acetal, but also with the added properties of PTFE, which is also known as Teflon. With added fluorocarbon fibers, components made of Delrin can maintain high operating loads at high speeds with very little wear, all due to Teflon's slippery, yet solid characteristics.

PTFE bearings also require absolutely no lubrication, which reduces the cost and time related to maintaining equipment. This material boasts one of the uppermost continuous temperatures among plastic materials.

In addition to Delrin AF, DuPont also offers additional thermoplastic materials under the Delrin name that are created with various goals in mind. They include toughened resins, UV resistant grades, and extrusion resins.

Other Delrin attributes that may be worth considering

Delrin's chemical composition, standard molecular structure, and high degree of crystallinity distinguish it from other materials, but there are a few other attributes that make it an especially good choice for military-based applications.|However, there are other attributes that make it an especially good choice for military applications.

Can withstand temperatures of minus 40 degrees Celsius
High mechanical strength and rigidity
Unbeatable fatigue stability
Shows high resistance to continual impacts over extended time periods
Can resist gasolines, solvents and moisture, along with many other neutral chemicals
Exceptional dimensional stability
Natural lubricity
Shows high resilience
Effective electrical insulating properties
Ease of manufacture

Conclusion

Although Delrin is a high-quality thermoplastic that can definitely excel in a military environment, other Acetal products may be a better choice, depending upon the particular application. Before choosing a product, a full analysis of the upcoming and its requirements are needed.

Choosing the right fasteners and components for an important project could be a real challenge. If you need a little help deciding which materials might be ideal for your project , please don't hesitate to contact us. We're happy to help ensure your next project is completed easily.

Keywords: plastic fasteners, plastic screws

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