durbans heat resistant epoxy formula

[nwcove]

Re: durbans heat resistant epoxy formula

I love out of the box thinking.....When we had our first daughter, my wife wanted a breast pump, and I was too cheap (broke) to buy one. So I built one out of a windshield wiper motor. It has worked great for two kids now. It is, quite by accident, fire resistant and uses neither epoxy or gypsum in its construction.

i tried the same thing many years ago....but gave up after safety testing ,...the wipers broke my nose....twice!!!

 

[dockrat100]

Re: durbans heat resistant epoxy formula

I sent a video of it to the lactation specialist at the hospital, and she thought it was the coolest thing. She even recognized what model of pump I was copying. Nothing says "I love you", like building medical equipment for your beloved....

 

[phillnjack2]

Re: durbans heat resistant epoxy formula

i think somewhere someone is getting false temperate facts, simply look up the properties of epoxy resin



Glass transition temperature ............(Tg) 120 - 130 ?C (note this is Celcius and would equal 248f -266f )

Tensile strength ............................................85 N/mm?
Tensile Modulus ...........................................10,500 N/mm?
Elongation at break ..............................................0.8%
Flexural strength .................................................112 N/mm?
Flexural Modulus .................................................10,000 N/mm?
Compressive Strength .........................................190 N/mm?
Coefficient of linear thermal expansion ......................34 10-6
Water absorption - 24 hours at 23?C .......................5-10 mg (0.06-0.068%) ISO 62 (1980)

Thermal Properties.
Thermal Shock .....................2000 cycles (90 sec. at 75 ?C, 90 sec. dwell, 90 sec. at 15?C) No effect
Smoke Emission ......................Low Smoke Emission ? BS 6853 1999 App. D Clause d.8.4
Result ? Ao(on) 8.75, Ao(off) 10.41
Flammability ..............................Class 0 as classified by the current Building Regulations
Thermal Decomposition ...........................350? C

Radioactive Decontamination BS 4247 Part 1 Test
Decontamination factor (geometric mean)................ A5598
Deviation factor ...................................................1.25
Ease of decontamination classification ?Excellent?

im not scientist but i can clearly see the massive temp difference of the properties of epoxy resin to the west system stuff.


phill

 

[durban]

Re: durbans heat resistant epoxy formula

phillnjack2 my formula will work with this too , it should increase the heat range too .

 

[dockrat100]

Re: durbans heat resistant epoxy formula

quotei think somewhere someone is getting false temperate facts, simply look up the properties of epoxy resin)

I'm not a scientist either, but have a few years teaching high school chemistry.

I pulled my figures from west systems website, and included a link in my previous post to where my figures came from. Epoxy resin comes in a wide range of formulations, with widely varying characteristics. Your numbers, while correct, are from a different product than the one durban says he used.

My earlier crack about jb weld is an apt one, as it has been used for a long time in higher temperature applications than what west system epoxy can withstand. (ie, repairing cracked engine blocks.) Comparing one epoxy to another is like comparing acetic acid (Adds flavor to salad dressings) to Sulphuric acid (Eats leather and human flesh with annoying speed, and does not go well on a salad..)

By the way, adding something to epoxy may change the specific heat of the epoxy-additive matrix, but it with not make the epoxy behave better in high heat. If the additive acts as a heat sink to the epoxy molecules, it may require more thermal energy to achieve a given temperature (TG), but once that temp is achieved, it will behave predictably.

The idea of mixing a powder with an epoxy is a good one, and an old one. JB weld, in all of its formulations is basically formed by mixing iron, or aluminum, or another metal in an epoxy matrix. Devcon titanium is a similar product. They both work well in some applications. They might work well for what Durban has to fix. I know I have fixed many items around the house with each.

Suspending solid particulate of any kind in an epoxy matrix will have no effect on the chemical properties of the epoxy, unless they react somehow with the epoxy. I don't see how any of the particulates we have discussed would do that.