LumberJocks

Epoxy and heat...

  • Advertise with us

« back to Designing Woodworking Projects forum

Forum topic by BillGo posted 01-24-2021 11:43 PM 554 views 0 times favorited 8 replies Add to Favorites Watch
View BillGo's profile

BillGo

177 posts in 380 days


01-24-2021 11:43 PM

Topic tags/keywords: question epoxy

I am looking at designs for trivets, and was wondering if I could combine wood and epoxy in a trivet. In particular, I was concerned with how the epoxy would react to a hot pot placed on it.

Sorry if this was already covered, I searched around but could not find a discussion on this already.

Thanks!

-- Bill - in New Hampshire


8 replies so far

View Francisco Luna's profile

Francisco Luna

1050 posts in 4639 days


#1 posted 01-24-2021 11:57 PM

Bill,
Working as a bench man years ago for a woodworking shop, we used to combine gorilla glue (polyurethane) applied in one side of the pieces to blue glued up and Titebond III on the other piece….great results!...probably is not what you are looking for but Im sure other guys are coming with more ideas….

-- "Menos es mas" Ludwing Mies Van Der Rohe

View mitch_56's profile

mitch_56

60 posts in 1719 days


#2 posted 01-25-2021 12:13 AM

Like everything, it depends, but if you’re talking hobbyist epoxies like West Systems, it’s probably not a great idea.

“hot” is a relative term. If you look at the West Systems physical properties, you’ll see it starts to be affected at a temp lower even than boiling water. At around 140 F, it starts to become rubbery and flexible. The epoxy will be just fine technically speaking, but it could change shape on you.

Worse, cohesive failures become more prevalent at higher temps, meaning that the epoxy tends to stop bonding to other, non-epoxy stuff. So your epoxy inserts might simply fall out of the wood.

There are high-temp epoxies available that can withstand insane temps, but you’re probably looking for something that cures at room temperature as opposed to an industrial oven…

View Rich's profile (online now)

Rich

7462 posts in 1835 days


#3 posted 01-25-2021 12:41 AM

On the System Three web site they give a maximum service temperature of 160ºF for their epoxy resin.

-- Half of what we read or hear about finishing is right. We just don’t know which half! — Bob Flexner

View Foghorn's profile

Foghorn

1296 posts in 632 days


#4 posted 01-25-2021 01:12 AM

I use Titebond 2 or 3 to glue wooden purflings to my bindings for guitars before I bend them on a hot pipe or bending machine at up to 350F. They don’t separate contrary to the temperatures given on their website. Original Titebond separates at about 150F. This is obviously not helpful if you’re thinking of a “river” trivet.

-- Darrel

View Lazyman's profile

Lazyman

7987 posts in 2633 days


#5 posted 01-25-2021 03:18 AM

It will depend upon which epoxy you use. JB Weld for example can handle over 500°F. I think that Stone Coat countertop epoxy can handle over 400°F. Are you trying to fill a void or just a surface coating?

-- Nathan, TX -- Hire the lazy man. He may not do as much work but that's because he will find a better way.

View BillGo's profile

BillGo

177 posts in 380 days


#6 posted 01-25-2021 03:30 PM

Are you trying to fill a void or just a surface coating?

I would like to make a deep etching in the surface with some color, and then fill it back in to make it level with the rest of the surface.

-- Bill - in New Hampshire

View Lazyman's profile

Lazyman

7987 posts in 2633 days


#7 posted 01-25-2021 03:50 PM

I think that the Stone Coat countertop epoxy can layer up to 1/8” per coat. They have a casting epoxy for up to 3/4” pours but it may not have the same heat resistance as the the top coat. I would give them a call and ask them about what you are trying to do and verify that the level of heat resistance meets your needs. I just watched one of their how-to videos and their PR indicates that they want to be very helpful to potential clients so I’ll bet that they will be be glad to help you out.

-- Nathan, TX -- Hire the lazy man. He may not do as much work but that's because he will find a better way.

View BillGo's profile

BillGo

177 posts in 380 days


#8 posted 01-26-2021 06:16 PM

Thanks for the Stone Coat reference. I sent a question into their support center. I will post their answer back to this forum topic when I hear back from them.

-- Bill - in New Hampshire

Have your say...

You must be signed in to reply.

DISCLAIMER: Any posts on LJ are posted by individuals acting in their own right and do not necessarily reflect the views of LJ. LJ will not be held liable for the actions of any user.

Latest Projects | Latest Blog Entries | Latest Forum Topics

HomeRefurbers.com