epoxy or polyester resin

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Rproductions

Member - Posts: 4

Joined: June 23, 2003

Posted: June 28, 2003 at 4:25 AM / IP Logged

What is the diffrence between epoxy and polyester resin?? I can get epoxy resin cheap here. can I use that??

Thank you.

ezridr

Copper - Posts: 127

Joined: June 09, 2003

Location: United States

Posted: July 02, 2003 at 8:58 PM / IP Logged

Epoxy resin is a type of resin for bonding, and is used to hold things together, the epoxy resin is only 1 of 2 components used, so epoxy resin is to be used with epoxy, and the polyester is to be used with fiberglass

My mechanic told me, "I couldn't fix your brakes, so I made your horn louder"

Rproductions

Member - Posts: 4

Joined: June 23, 2003

Posted: July 03, 2003 at 2:14 AM / IP Logged

epoxy or polyester resin -- posted image.

???? So I can't make my enclosure only with epoxi resin mixed with hardner and fiberglass cloth.??

ezridr

Copper - Posts: 127

Joined: June 09, 2003

Location: United States

Posted: July 03, 2003 at 7:36 PM / IP Logged

I won't react right, the epoxy resin is for epoxy fillers, which is usaully a 2 or 3 part mix, the polyester resin is for fiberglass, which you only need to add hardener

My mechanic told me, "I couldn't fix your brakes, so I made your horn louder"

iaudio

Copper - Posts: 82

Joined: March 17, 2003

Posted: July 07, 2003 at 7:31 PM / IP Logged

epoxy resins will work fine with fiberglass. That's what is used to make high strength composites such as kevlar and carbon fiber. Epoxy is much lighter and stronger than polyester or vinyl ester resins.

Regular fiberglass chop mat is held together with a binding agent that polyester resins break down during layup. Epoxy resins will not break down this binding agent and will not properly adhere to regular chop mat. You have to use fiberglass cloth or chop mat that has been stitched together.

pureRF

Silver - Posts: 619

Joined: July 22, 2003

Location: United States

Posted: July 23, 2003 at 7:52 PM / IP Logged

So could u use fiberglass mat on the main parts like first 8 layers of the box with polyester resin and then for the top parts where u put fiberglass cloth u can use epoxy resins?

dream it, build it, fiberglass it

iaudio

Copper - Posts: 82

Joined: March 17, 2003

Posted: July 23, 2003 at 10:15 PM / IP Logged

You can apply epoxies to polyester parts but you cannot apply polyesters to epoxy parts. In general it's best not to mix resin types. If you're making parts 8 layers thick, consider using coremat every third or fourth layer.

pureRF

Silver - Posts: 619

Joined: July 22, 2003

Location: United States

Posted: July 24, 2003 at 11:42 AM / IP Logged

So im guessing coremat can be applied with a poly resin? and will coremat help the strenght?

dream it, build it, fiberglass it

iaudio

Copper - Posts: 82

Joined: March 17, 2003

Posted: July 24, 2003 at 9:28 PM / IP Logged

Do two layer chop, 1 layer coremat, and another two layers of chop. You can't lap coremat over itself and it doesn't stretch so do a couple of practice pieces first. Coremat dramatically increases strength without adding a whole lot of cost or weight.

pureRF

Silver - Posts: 619

Joined: July 22, 2003

Location: United States

Posted: July 24, 2003 at 10:12 PM / IP Logged

can u do patches of coremat like 12 by 12 squares as long as u get the close to eachother?

dream it, build it, fiberglass it

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