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Is Kevlar a Thermoset or a Thermoplastic Polymer?

Views: 0     Author: Site Editor     Publish Time: 2022-12-28      Origin: Site

At one point in time, the term "thermoplastic" was synonymous with molding and was partly industrial. The word has been modified by something that appears similar but is vastly different: thermoset.

In this article, we will understand if Kevlar is a thermoset or a thermoplastic polymer.

What are thermoset and thermoplastic?

Any plastic that dissolves into a soft state above a definite heat and reinforces upon curing is considered a thermoplastic. Thermoplastics can be reprocessed and reshaped indefinitely. Even before the molding phase, thermoplastics are generally stored as granules.

Paint, polyethylene terephthalate, polycaprolactone, and polythene including nylon, are prevalent thermoplastics. Such components are used in a wide range of products.

Thermoplastic creates products that are agile, precise, and have a visually appealing finish. Thus thermoplastics have seen widespread use in the injection molding phase. However, thermoplastics are also treasured for their renewability.

Conversely to thermoplastics, thermosets are components that, upon getting cured once, stay entirely solid. However, in the hardening process, polymers within the content bind to establish unbroken, irrevocable ties. It thus implies that even at exceptionally high temperatures, thermosets will still not dissolve.

Epoxy, polyisoprene, polyurethane, and phenolic are common thermoset plastics and polymers. Furthermore, some substances, such as nylon, can be found in both thermoplastic and thermoset forms. The elements of thermoset polymers, with exception of thermoplastic particles, are kept in form of liquid, typically in big containers.

Kevlar Conveyor Belt

What is Kevlar?

Kevlar, also known as para-aramid, is a durable, heat-resistant synthetic fiber. Thus it is similar to aramids like Nomex and Technora. Stephanie Kwolek invented the super high substance at DuPont in 1965. Hence it was initially utilized widely during the early 1970s as a substitute for metal in motorsport tires. This is generally rolled into strings or textile plates. These plates can be used on their own or as an element in synthetic structures.

Kevlar is made in a solution by combining the polymeric materials 1,4-phenylene-diamine & terephthaloyl chloride. It's part of a condensed water reaction that produces hydrochloric acid as a by-product.

Let me go right to the ointment at this point. Kevlar is a thermoplastic material. The primary reason I respond in this manner is that thermosets are cross-linked polymers. The molecule's size becomes the same as the container or whole part size after cross-linking. Yes, the molecule is the size of the thing you're holding in the case of a thermoset.

Kevlar polyacrylamide has no melting point hence it is said to be a thermoset material. Furthermore, Kevlar is a polymer because it is made up of multiple monomeric' units. Kevlar is a solution spun fiber made from a monomer/oligomer solution. Trying to leave a spinnerette pit, the stream of the solution falls into a 'non-solvent,' and the solubilized clump snatched it into the fiber.


From all our discussions so far, it is clear that Kevlar is a thermoset material due to its properties. It has no melting point and can be rigid after processing. However, we have other interesting topics on our homepage, kindly visit to read more.

For any further questions, please do not hesitate to contact us at toby@gdcalm.com.

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