As you allready know, aluminum is a good conductor of heat. The defrosting board is fairly thick with good mass/weight for its size.
I use mine all the time. It will not magically defrost within minutes, but it does hasten the process. Rather than wasting water, placing the board in the sun speeds up the defrosting period considerably. It also helps to turn the frozen item over about halfway through.
When I freeze meats, for example, a single layer will defrost more quickly and evenly than a stack of two thick steaks/chops will do.
Since my frozen food is either well-wrapped in freezer wrap or vacuum sealed (for sous-viding), there’s no issue of contamination. Spray it down with a solution of bleach and water if need be; I usually just hand-wash it with soap and rinse in hot water.
One of the best uses of it is REVERSE conducting: using the board to cool down hot pans!
I make my own soup stock as I like to always have it on hand. Once finished cooking, placing the stockpot on the board cools it down much faster so I can get it into the refrigerator quicker. I place the board over something heatproof - cold burners on the stove, or a cooling rack - just in case.
The Oyolia thawing board are made from a super-conductive aluminum which absorbs natural heat energy in the air and releases it directly into your food. You might want to put your meat flat to ensure a full contact with the tray. This speeds up the defrosting process. I have one and I love it.
Putting a very different spin on fast food, this tray lets you prepare a healthy, home-cooked meal in a jiffy. Think about how much time it takes to prepare a steak. You spend over an hour just thawing the meat, and another few hours to actually cook your meal. The Oyolia tray was designed to cut the meat thawing time by as much as 75%. It uses a superconducting material to accelerate the defrosting process, bringing your steak to a workable room temperature in roughly 15 minutes.
Oyolia's innovative material doesn’t alter the physics of thawing meat, it just accelerates it. Much better than waiting for hours for the meat to thaw, or desperately chucking your expensive steak in lukewarm water (which is honestly a culinary crime), just rest the steak on the Oyolia defrost tray and it begins thawing at a much faster rate. Oyolia's superconducting aero-aluminum helps conduct the ice away from your frozen meat at a rate that’s 4x faster, so you can focus on your cooking, rather than on waiting.
The superconductive tray can be used to rapidly freeze meats too. The aero-aluminum tray can be used in the freezer too, to accelerate the freezing process, making your meats freeze faster and last longer. The tray is incredibly simple to use, and splits into multiple, easy-to-store segments when you don’t need it. Moreover, it helps thaw your meat faster without compromising on its taste or nutritional value. Oh, and it’s dishwasher safe too!
Yes, the defrosting trays are safe to use. If you're willing to buy one, get the largest! It will help you thaw any amount of meat!