What Are Thermoset Resins?
A thermoset resin is defined as a rigid petrochemical material that requires chemical curing brought on by
heat and a catalyst. They are generally made of cross-linking polymers produced by chemical bonding
that also allow for extreme resistance to high temperatures. However, low elongation and elasticity
upon hardening can occur, plus recycling the resin doesn’t allow for melting
or reheating for different shapes.
When heat is applied, its heavy cross-linking structure eliminates the risk of remelting the materia. It is ideal for electronics and appliances since their shape tends to remain dimensionally stable.
Resins are supplied in liquid form to make thermoset resins processable, it often requires other chemicals and not only resins. The impregnation with reinforcing fibers such as fiberglass, Kevlar, or carbon fibers provides them with the required strength and stability.
Types of thermosetting resins
A selection of the best and standard thermosetting resins available for FRP manufacturing include the following:
Polyester
This is a general-purpose (orthophthalic) thermoset resin that provides an average level of water and chemical resistance. Premium (isophthalic) polyesters, however, have improved resistance to moisture and corrosion.
Vinyl ester
This is a custom thermoset solution designed by the esterification of epoxy with methacrylic acid or acrylic. It has superior resistance to corrosion and moisture and provides long-term mechanical properties. These are best for coastal as well as marine applications.
Epoxy
Epoxies are preferred in reinforcing and bonding FRP components, as they possess excellent thermal and mechanical properties. They are suitable for compounded proprietary applications.
Phenolic
Derived from formaldehyde, phenolic thermoset resins have low smoke emissions and provide excellent fire resistance.
Polyurethane
The wear-resistant and load-bearing abilities of polyurethane make it suitable for impregnating resins and thick coating materials that require long-lasting surface finishing.
Each of these offer unique thermochemical properties.
Applications of thermoset resins
The resins mentioned above have specific applications based on their target fields of use. Some of these include:
Aerospace/ electronics/ rail/ ballistics
Construction/ automotive/ furnishing/ textile
Sheet/ bulk molding compounds
Synthetic fibers
Insulating foams
Mattresses
Adhesives/ coatings
Advantages of thermosetting resin
Thermoset polymers or resins have multiple advantages varying greatly according to the resins' underlying characteristics. Some of these advantages include:
Resistance to solvents and corrosives
Strong adhesion
Greater finishing
Superior fatigue strength
Resistance to high temperatures
Want to know more? Tell us about your precise needs, and a qualified Verretec specialist will be in touch with more information. Call us at (724) 543-2333 or fill this contact form to request a quote.
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