The difference between epoxy resin and polyester resin

Release time:04-11-2020
Abstract:

Polyester resin characteristics: Polyester resin is bri […]

Polyester resin characteristics:

Polyester resin is brittle and prone to microcracking.
The shelf life of polyester resin is about 6 months – 1 year.
You can change the curing time of polyester resin by adding more or less MEKP catalyst.
The cost of polyester resin is usually slightly lower than epoxy resin.
Polyester emits volatile organic compounds and has heavy flammable fumes.
Polyester resin cannot be cured into a film well, so it cannot be used well as an adhesive.
The larger the dumping amount, the more shrinkage of the polyester resin after curing.
Polyester resin is UV resistant and does not require topcoating to prevent yellowing or degradation due to sunlight.
Once the polyester resin is cured, it can penetrate water, which means that water can finally pass through.
The adhesive strength of polyester resins is usually less than 500 psi.
Polyester resin will not be combined with epoxy resin.
Epoxy resins have strength, gloss and durability and are ideal for bar countertops, tabletops and countertops, building and repairing wooden and fiberglass boats, manufacturing fiberglass and carbon fiber parts, as well as floors, potting electronics, bonding wood , Metal, concrete and many types of plastic, with dry rot, pebble road sealing and repairing wood, and more applications that require thorough bonding, strength, glass-like finish and durability.

Epoxy resin characteristics:

Epoxy resins are very strong and have excellent bending strength. Our 300/21 and 400/21 epoxy resins have a flexural strength of 17,500 psi. Our 300/11 and 400/11 epoxy resins have a flexural strength of 12,800 psi.

Epoxy resin has a good shelf life. Although we guarantee the service life of epoxy resin is 6 months, but if the epoxy resin is properly stored, it can be stored on the shelf for at least several years.
You cannot change the curing time of epoxy resin. The curing time of epoxy resin depends on the curing agent and temperature. Adding more curing agent will not make it cure faster! Too much curing agent will actually make the cured epoxy rubbery. You can reduce the curing time by increasing the ambient temperature around the epoxy. When the temperature increases by 10 F, the temperature will rise above 70 F, and you can reduce the curing time by 10%. However, do not increase the temperature above 100 F.

The epoxy resin will not shrink after curing.
Epoxy resins are very resistant to wear, cracks, flaking, corrosion, and damage caused by chemical and environmental degradation.
The cured epoxy resin is moisture-proof.
Epoxy resin itself cannot resist ultraviolet rays. Some epoxy resins have added anti-UV additives, and the effect is good. However, the best way to ensure that your epoxy resin does not yellow or be broken by ultraviolet light is to apply transparent UV-resistant polyurethane on it. Then you will get the strength and durability of the epoxy resin and the UV protection of the polyurethane.
The bonding strength of epoxy resins is usually as high as 2,000 psi.
Epoxy resin will not adhere to polyethylene, polypropylene, EPDM, anodized aluminum, Teflon or Tedra.