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Questions tagged [epoxy]

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3 answers
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What load would a 2" x 4' x 8' sheet of pink XPS foam wrapped in fiberglass using epoxy resin support if used as an 8' bridge?

I need to build a light weight ramp roughly 4' wide by 8' long. I've built similar out of 1/2" plywood and 2x4s. That's plenty strong but much too heavy. If I wrapped a 4' x 8' sheet of 2" ...
Douglas Surber's user avatar
1 vote
2 answers
105 views

Can epoxy bond two Aluminum alloy beams?

The bicycle component manufacturer Shimano makes crankarms named "Hollowtech". Hollowtech crankarms are meant to be both strong and light. As the diagram below (source: Shimano) shows, the ...
Sam7919's user avatar
  • 441
0 votes
2 answers
154 views

Cheap epoxy for Liquid Nitrogen temperatures?

I have been testing acrylic in and out of a N2 bath. It is a very thick piece so it is holding up surprisingly well. I need to bond pieces of acrylic together for my application that will be submerged ...
Blacbeanburgr's user avatar
2 votes
1 answer
2k views

How well does epoxy bond to PETG / ABS vs Wood?

I know that PLA does not bond at all, just peel right off But i'm wondering about PETG or ABS Will they bond just as well as wood?
Simon's user avatar
  • 115
1 vote
1 answer
221 views

Best DIY material for a high-torque cog or gear?

I am making a gear/cog to attach to a high torque stepper motor. I can realistically make it out of the following variety of materials: 3D printer PLA/PLA+ etc. layered PLA/PLA+ and fiberglass made ...
Chris's user avatar
  • 133
0 votes
0 answers
132 views

Best glue option for laminated Kevlar <> birch plywood for not peeling off

I have a problem where I glue a laminated sheet of Kevlar to birch plywood and it peels off easily I tried: Laminating the Kevlar directly on the plywood with lamenting epoxy Using the laminating ...
Simon's user avatar
  • 115
0 votes
1 answer
38 views

Fix plastic tub (leak) and resist applied forces

I hope I'm not too much off topic here. I'm hoping it can make sense as a mechanical engineering question. There is a crack in the front of the tub of my front loading washing machine. As you can see ...
Francois's user avatar
  • 111
6 votes
0 answers
4k views

Conservative rebar dowel hole sizing and embedment depth

My question concerns the hole sizing and embedment depth of post installed rebar which is secured with epoxy mortar into a hole in a reinforced concrete slab. Hole diameter sizing My assumption #1 ...
egg's user avatar
  • 857
1 vote
2 answers
258 views

Epoxy that can withstand up to 800C and is optically transparent?

I'm looking to use an epoxy in a high-temp environment like 800C, and one that is optically transparent at 450nm (not below 90% transmission). But i'm having trouble finding one. It can be made of any ...
Dina's user avatar
  • 11
2 votes
0 answers
43 views

Epoxy/Adhesive to bond solid wood and acrylic

I am trying to bond solid wood with with clear acrylic, with requirement to able to withstand shearing force, not more than 6kg over an area of 100 sq.cm. Have tried to bond with result of the ...
Lance's user avatar
  • 21
0 votes
2 answers
2k views

Epoxy curing, heat or no heat?

Most if not all of the off-the-shelf epoxies I've used have generated a fair amount of heat while they are hardening. This seems to indicate to me that these are exothermic reaction, i.e. they ...
Diesel's user avatar
  • 622
2 votes
3 answers
528 views

Can you postcure epoxy composites outside the mold?

Say I make a fiberglass/epoxy part on a plastic mold, and it cures at room temperature. The epoxy system calls for a postcure at 250F, but the mold cannot withstand 250F. If I take off the part and ...
quantumkayos's user avatar
1 vote
0 answers
78 views

What is a good way to bond stuff to silicon nitride?

I am currently looking into attaching a wire onto Silicon Nitride igniter, which is being used as a resistive heater. The problem I am experiencing is that the Silicon nitride is extremely hard to ...
VoidShredder's user avatar
1 vote
1 answer
1k views

How strong is the adhesion between UHMWPE Fiber and Epoxy Resin?

How strong is the adhesion between Ultra High Molecular Weight Polyethylene(UHMWPE) Fiber and Epoxy Resin normally? If we take the UHMWPE fiber sheet as it is without subjecting it to any chemical or ...
nihal's user avatar
  • 145
3 votes
2 answers
645 views

Why does epoxy resin become opaque after long exposure to water and LED lamps?

I want to put LED lamps in water. Up until now I used epoxy glass for its isolation, but after one year it starts to become opaque and lose its clearness. What causes the epoxy glass to cloud and ...
Soheil Paper's user avatar
9 votes
3 answers
367 views

Bonding Semiconductors to PCB

I'm trying to bond semiconductor samples (Si and Ge) area ~1-2cm^2 to fiberglass printed circuit board (PCB) We use West system marine epoxy for other things. 105 resin 209 hardener (long cure time.) ...
George Herold's user avatar