What are the problems with teflon or aluminum pans?
92303
With TEFLON(r) DUPONT it is not all that dangerous because of the small amount of TEFLON on the pan or what ever.\nTEFLON gives off TOXIC vapors when heated. \nWhen I worked for DUPONT we wore fresh air masks when we machined TEFLON.
871748
rule out metals!\n\ni'm surprised nobody said foam - styrofoam, for example.\n\nor anyhthing else that traps air.\n\nglass.\n\nplastics.
128080
teflon  cookware at high temperatures (Dupont says 662, other reports have said as low as 300)may potentially be hazardous to humans and is known to be deadly to birds. Given that the temperatures even in hot water systems is under 200, this should not be an issue
301204
Its hard to say, unless one knows what acids or acid vapors will be in contact with the plastic.\n\nThe biggest issue once acid compatibility is taken care of, is  going to be easy of cleaning. Contaminiation will build up, and surface conductivity can take a severe header, unless the surface can be kept clean.\n\nTeflon is fairly inert, but is somewhat of a pain to work with and spendy. Delrin (acetal) is easy to machine, but somewhat tricky to get a decent surface finish on. HDPE is cheap, but with the wrong acids can be problemtic.
400227
the surface of the frying pan is etched so it has lots of holes, like the loops side of Velcro.  Then the teflon is made right on the pan, so it's mechanically bonded to the pan by filling the loops.
53542
Only if you eat the teflon.
211196
I doubt if I can list ALL the defects possible in metal castings, but here are some of the more common ones.\n\n1.) Hairline cracks\n2.) Bubbles caused by water vapor\n3.) Alloy proportions wrong\n4.) Defect in sand mold causes blemish
137804
The handles are powerful insulators, so they don't conduct the heat of the pan into the handles. They release the little heat that they do conduct into the air, therefore feel cool to the touch.
814819
Let foil over the pans be your best friend!!!!!\nWorks 4 me and I even place it on the bottom of my oven, under the coils to keep oven clean. Change it once a week.
540767
The conductivity of aluminium is required. A detailed solution of the Heat equation (A pde) is necessary to get an accurate answer. In the absence of any simplifying assumptions, this problem is not trivial
417677
For refractors, the most common problem is chromatic aberration. In this, you get little rainbows around bright objects and a blurrier image around others. This happens because the lenses act like prisms. All refractors are subject to this, but some *very* expensive ones have it less. They fix this by using more than one type of glass.\n\nFor reflectors, the main problem is spherical aberration. This is caused by the mirror not being a perfect paraboloid. It is much easier to grind a sphere than a paraboloid, and most mirrors are first ground to a spherical shape. If the subsequent grinding isn't done right, the resulting images will be blurrier than need be. For decent images, the mirror's shape has to be within 1/4 of a wavelength of light, and for a good image it should be correct to within 1/10 of a wavelength. Considering how small the wavelength of visible light is, you can see how hard that is.
636584
"Many metals, such as copper, bronze, silver, brass, and some steels, readily react with solder to form strong chemical and physical bonds. Other metals, such as aluminum, high alloy steels, cast iron, and titanium, range from very difficult to impossible to solder."\n\n"Soldering Hints\nA useful *anti-flux* is ordinary toothpaste."
69035
fluon is a trade name for polytetrafluoroethylene (PTFE) which is also commonly known as teflon.  here is a page with a lot of material properties:\n\nhttp://www.agc.co.jp/english/chemicals/jushi/ptfe/PTFE.htm\nhttp://www.agc.co.jp/english/chemicals/jushi/ptfe/PTFE3.htm\n\ncheers!
396630
It's a good question.\nThe teflon coating you get on pans only gets it's non stick characterists once it has been baked on to the pan.\nThe product comes as a powder or fluid which is sprayed onto the pan and then baked on.\nBecause it does not have the non stick properties untill baked it forms good van der vaals forces (intra-molecular attraction) with the pan, hence it stick to the pan, and not your eggs.
53847
First they sandblast the pan to create a lot of microscratches on its surface. Then they spray on a coat of Teflon primer. This primer, like most primers, is thin, enabling it to flow into the the micro-scratches. The primed surface is then baked at high heat, causing the Teflon to solidify and get a reasonably secure mechanical grip. Next you spray on a finish coat and bake that. (The Teflon finish coat will stick to the Teflon primer coat just fine.)
217015
One could argue plastic wrap since the Aluminum foil would allow for greater heat conduction into the orange from the air.\n\nAluminum, being a metal, is a good conductor of heat.  The metal foil will allow for heat from the "hot" air to be conducted into the "cold" orange much quicker than the plastic wrap would.\nI dont think the light enegry being absorbed or reflected is that significant.\n\nTake the opposite case as an example, say you had a hot metal pot of water an you wanted to set it on some surface so that it stays hot the longest.  If you set the pot on a metal cooking sheet, the heat will be conducted away from the pot and into the air much quicker than if you were to set it on a peice of wood for example.
612952
It depends, is Teflon a nice guy?\n\nSeriously if you  should happen to see that the Teflon is starting to wear, get rid of the pan and buy a new one.  The real dander with all the hype is when the particles come loose and go into the food.\n\nA pan in good condition is of little to no concern.\n\nRemember almost 300,000 people died from car accidents last year, but we still get in our cars.\n \nI don't know of anyone who has died from Teflon frying pans.