Fiberr Labs
Dec 9, 2023
A comparison with the pros and cons of common FRP resin types
When comparing Orthophthalic (Ortho), Isophthalic (Iso), and Vinyl Ester (VE) resins for use in Fiberglass Reinforced Plastics (FRP), there are several key differences to consider:
Orthophthalic Resin: Known as a basic type of resin in the industry, orthophthalic resin is typically the least expensive option. However, it offers inferior properties in terms of strength, chemical resistance, and corrosion resistance when compared to isophthalic and vinyl ester resins. It is not recommended for use in contact with chemicals.
Isophthalic Resin: This resin is slightly more expensive than orthophthalic resin, but it offers better resistance to corrosion and chemicals. Isophthalic resins provide higher strength, better flexibility, and improved chemical resistance compared to orthophthalic resins. In laboratory tests, fiberglass reinforced isophthalic polyester resin panels showed notably higher flexural and tensile properties than panels using orthophthalic polyester resin.
Vinyl Ester Resin: This type of resin is more expensive than isophthalic resin but offers even higher strength and superior chemical and corrosion resistance. Vinyl ester is typically recommended for chemical processing areas and for structures that require additional strength.
In terms of application, isophthalic resin is often recommended for most grating applications due to its balance of strength, long service life, flammability, corrosion, and chemical resistance. Vinyl ester is generally recommended for structural profiles, ladders, handrail systems, and other structural products where the best performance and strength are needed.
Feature | Orthophthalic Resin | Isophthalic Resin | Vinyl Ester Resin |
Cost | Least expensive | Slightly more expensive than Ortho | Slightly higher than Iso |
Strength | Inferior compared to Iso and VE | Higher than Ortho | Higher than Iso |
Chemical Resistance | Not recommended for chemical contact | Better than Ortho | Superior to both Ortho and Iso |
Corrosion Resistance | Inferior compared to Iso and VE | Better than Ortho | Superior to both Ortho and Iso |
Flexibility | Lower compared to Iso and VE | Better than Ortho | - |
Recommended Applications | Basic FRP applications | Grating applications, general FRP use | Chemical processing areas, structural applications |
These differences make each type of resin suited for specific applications within the FRP industry. The choice of resin will depend on factors such as the required strength, chemical resistance, and the specific environment in which the FRP product will be used.