If you use aluminum foil for cooking, read this!
Health Ecology: All over the world, people use special devices that help them prepare delicious dishes in the kitchen. From budget aluminum foil to very expensive ceramic knives, there is no end to the range of tools the home cook keeps on hand. Aluminum foil is present in most homes. It is universal and easy to use.
Aluminum foil is present in most homes.
It is universal, easy to use, and also allows you to make the cleaning process as fast as possible. Foil can be used to cover a casserole or make the most perfect baked potato.
However, if you often cook with foil, you should definitely know the following facts. It’s likely that you’ve never heard of this before! Simply put, it is dangerous to your health!
Bad for your brain
Aluminum is a heavy neurotoxic metal that has long been associated with the development of Alzheimer’s disease. Exposure to this toxin can lead to decreased coordination, memory, and balance. Unfortunately, for many who suffer from Alzheimer’s disease, permanent memory loss creates a huge metaphorical gap with loved ones that cannot be repaired. It’s hard to maintain a bond with someone who doesn’t even remember you.
Bad for your bones
This toxic metal tends to accumulate in bones. It competes directly with calcium for space in your bones, and guess who wins this tug of war? While an aluminum skeletal frame may sound so appealing that every half-robot woman would love to have it, our bodies are not the stuff of science fiction. Our skeleton must be made of calcium so that our bones do not break from a simple fall.
Bad for your lungs
Inhalation of aluminum can lead to respiratory problems, including pulmonary fibrosis. If you frequently grill with aluminum foil, you may be left with a pair of bad lungs.
And how does this heavy metal get into your body? Sodas in aluminum cans and deodorants containing aluminum have long been considered the main sources of aluminum. Somehow aluminum foil didn’t make it into this list
You eat aluminum shavings
Nobody actually breaks off a piece of foil and chews it recklessly, unless you have a strange illness or are a cat playing with a ball of foil.
However, that’s exactly what you do when you cook with foil at high temperatures. Whether baking or grilling, high heat creates tiny cracks in the metal that can break off and get into your food. These pieces are so small that you will not be able to tell that they are hidden in the food.
Even if small pieces of metal don’t break off from the foil, you can still accidentally cause aluminum chemical leaching when you cook with certain spices or acidic foods such as lemon.
Dr. Essam Zubaidi, a chemical engineering researcher at the American University of Sharjah, found that just one meal cooked with foil could leach 400 mg of aluminum.
“The higher the temperature, the more leaching. Foil is not suitable for cooking and is not suitable for use with vegetables such as tomatoes, citrus fruits or spices.”
According to the World Health Organization, the daily maximum safe intake level should be no more than 60 mg.
You don’t even need to eat this metal to get enough of its toxins. You risk inhaling small pieces of aluminum if you do not cover your nose and mouth when standing near a stove or grill.
The foil in which you wrap food and grill it releases aluminum flakes into the air at high temperatures, which fly away along with the smoke, and you inhale it all. Ugh!
It is clear that this heavy metal is dangerous to your health. With this in mind, there are several precautions you should take to protect yourself.
Do not cook food with aluminum foil. Temporarily! Use it only for storing cold foods in the refrigerator. A better alternative would be to use glassware and avoid foil entirely.
Do not store spices, tomatoes or citrus fruits in foil. Never! Along with the acid, aluminum will also get into the food.
Get rid of aluminum cookware. Pots and pans need to go away! As soon as you can purchase stainless steel cookware, pots and pans. You can probably find these utensils at your local hardware store.
Whenever possible, use wax paper instead of aluminum foil.
I never suspected such dangers before. I’m going to reduce my use of aluminum foil immediately. And you?
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Change in physical and mechanical properties of aluminum under the influence of temperature
An increase in temperature causes an increase in electrical resistance; for high-purity aluminum, the temperature coefficient of electrical resistance is 0.00429 1/deg. The change in the electrical resistance of aluminum as a function of temperature is linear.
When the temperature drops below 20° C, the electrical resistance decreases sharply. For aluminum wire (made from AE grade aluminum). Specific electrical resistance at -60°C decreases by 20%, i.e. equals 0.25-0.0282 ohm mm2/m.
With an increase in temperature to 0.4T (T is the absolute temperature), recrystallization begins in metals (the process of formation and growth of new crystals).
The temperature at which recrystallization begins depends on the degree of deformation, the purity of the metal and the duration of heating; The more impurities in the metal and the shorter the heating time, the higher the recrystallization temperature.
When the recrystallization temperature is reached, the deformed metal, due to the formation of new crystals, completely loses its mechanical strength and restores its ductility. For aluminum, the recrystallization temperature is about 120° C. This temperature applies to highly deformed pure aluminum. However, during prolonged heating, recrystallization of aluminum can occur at lower temperatures.
In Fig. 2-4 shows the change in the mechanical properties of aluminum wire made of aluminum grade A5 0 5 mm as a function of temperature. The wire was tested in a cold-deformed state.
The change in the mechanical characteristics of aluminum tires with a cross section of 40X4 made of grade A 2 aluminum depending on temperature (up to 350° C) is shown in Fig. 2-5. A decrease in their tensile strength is observed starting at a temperature of 50C, while the relative elongation remains almost unchanged.
When aluminum bars are pushed together at the joint at a certain pressure and temperature, weakening may occur
contacts, the latter circumstance can damage electrical equipment. In Fig. 2-6 show the compression curves of tire aluminum. These curves show the heating limit, above which the aluminum tire begins to undergo plastic deformation, which causes contact failure. Such a limit should be considered a temperature of 200 ° C, since at it the plastic deformation of aluminum begins at pressures of about 200 kgf/cm2, i.e. at specific pressures corresponding to those usually accepted for an aluminum contact.
When considering the effect of elevated temperatures on changes in the properties of conductive aluminum, current heating should be taken into account, since during operation there is a loss of strength of aluminum wires, busbars and other products caused by current heating.
Carrying out tests at high current loads leads to complete softening of aluminum wires with a significant degree of cold deformation, and this softening occurs very quickly. Aluminum wire (grade A5) with 99% cold deformation completely softened in just 0.6 seconds at a temperature of 440° C. Loss of strength (beginning of recrystallization) in highly deformed aluminum wire for very short periods (0.1, 0. 3, 1.0 and 10 sec) actions of short circuit current lies in the temperature range 160-180 ° C. When exposed for 1000 hours at a temperature of 80° C, the strength properties of aluminum wire decreased significantly: the tensile strength decreased from 20 to 15 kgf/mm 2.
With decreasing temperature for all metals, in particular aluminum, tensile strength increases and elongation decreases.
When cooled from 20 to -60 ° C, the tensile strength of aluminum wire (03 mm) increased by 10.5%, while the relative elongation decreased by 13% of the original value. After a long (50 days) exposure of aluminum wire at a temperature of -60° C, no change in the tensile strength measured at room temperature was observed.
Construction material for low temperatures – aluminum
Aluminum alloys are a very important class of structural metals for use at sub-zero and even cryogenic temperatures. They are used in parts to work at temperatures as low as –270 °C. At subzero temperatures, most aluminum alloys exhibit only minor changes in their strength properties.
The tensile strength (tensile strength) and yield strength of aluminum alloys can only decrease slightly with decreasing temperature, but the impact strength remains approximately constant. Therefore, aluminum is a useful material for many low temperature applications.
The main limiting factor for the widespread use of aluminum alloys in cryogenic technology is their rather low elongation compared to some austenitic-ferritic steels. Therefore, in critical applications with increased safety requirements, these steels are still used.
A good example of the use of aluminum alloys at low temperatures is the manufacture of pressure vessels that operate in the temperature range from -195 to 65 °C. Aluminum alloys 5083 and 5456 are used here. For these alloys, in the temperature range from room temperature to –195 °C, the tensile strength increases by 30-40%, the yield strength by 5-10%, and the relative elongation by 60-100%.
Brief history of the appearance of food-grade aluminum foil
Aluminum foil has long been a common household tool, widely used for cooking. The technology for manufacturing aluminum foil was invented in Switzerland, which is not surprising – manufacturers and sellers of the famous Swiss chocolate went out of their way to come up with the most original and practical packaging for their product, popular all over the world.
It is known that the idea of using foil as wrapping paper came to the mind of the Swiss industrialist Heinrich Alfred Gauci, who patented this innovation in 1909.
However, the foil was thick and expensive. But after just a year or two, a certain Georg Robert Neher, also from Switzerland, already patents the technology for manufacturing thin food-grade aluminum foil.
Since then, the equipment has been improved, but the manufacturing technology of this product has remained essentially unchanged – thin aluminum plates are rolled on special machines, obtaining the finished product known to us.
Thin food-grade aluminum foil has been used in large quantities since 1913, when it replaced more expensive and thicker wrapping materials in the United States.
Many years have passed, but in modern media (especially on the Internet), statements constantly appear that the use of aluminum foil in cooking is dangerous. They say that aluminum penetrates into products, which puts our health at risk.
To try to understand which of them is right, let’s look at the hardware. So what is aluminum foil? Essentially, this is metal “paper”, which is a thin (as thick as a piece of paper) and wide shiny sheet of aluminum.
Areas of application of food foil: production, packaging, household
The areas of application of food foil are simply huge, we have already listed some of them. Let’s take a closer look at each:
- Food industry. In this area, the properties of aluminum foil to create a vacuum and not allow light and air to pass through play a huge role. You can appreciate the best qualities of aluminum foil by simply remembering the packaging for coffee or tea, which reliably stores the aroma of tea leaves, coffee granules or beans. Also pay attention to the packaging of your pet food – many of them are also made from this material. Aluminum foil in rolls
used at home – for baking delicious meat, fish and other equally appetizing dishes. For covering the windows of an apartment, house and even a car from the scorching sun in the summer heat.
- Pharmacology, cosmetology, tobacco production. Hygienic properties are most often the main reason why the above manufacturers choose aluminum foil. Packages created from it guarantee reliable transportation and complete protection of elite and simple varieties of tobacco, cosmetics and personal care products and, of course, medicines.
- Air heating and cooling systems. Due to its high thermal conductivity, aluminum foil allows you to save energy and achieve high efficiency.
- Automotive industry. Aluminum foil is used to make car interiors. It is flame resistant and, in the event of a fire, will prevent the rapid spread of fire. In addition, the foil creates a soundproofing effect in the car interior.
- In the field of construction and repair, aluminum foil is also actively used: finishing walls and facades, for the production of panels. It serves as a barrier, preventing moisture, evaporation, steam and other types of climatic influences from passing through.
Aluminum foil, the price of which is relatively low, is an almost universal, popular and beloved material.
Aluminum foil, which can be purchased at any hardware store, has become an integral attribute of the modern kitchen. We use it every day and the demand for this type of product is growing rapidly. It is not surprising that the production of aluminum foil has recently expanded its potential. For example, Russia ranks 3rd in the world in the production of food and technical aluminum foil.
Aluminum foil represents a huge opportunity for the prepared, frozen and perishable food market. Of course, as consumer demand grows, so does quality. Sanitary and hygienic standards and technical requirements for the finished material are being improved.
In the Food City Pro store you can buy food foil in bulk at the best prices. Come, call or fill out an application for a product on our website.
Application of aluminum metal
Aluminum is one of the lightest structural metals. Alloys obtained from aluminum after heat treatment, along with low density, are distinguished by high strength and other important mechanical properties, which makes aluminum indispensable for the manufacture of vehicle parts (pistons and crankcases, blocks and cylinder heads of aircraft and automobile engines, bearings, power trains and casing fuselages, etc.).
Aluminum is easily drawn and drawn, which is used in the production of food containers. The electrical conductivity of aluminum is approx. 61% of the electrical conductivity of copper, but aluminum is three times less dense.
The combination of good conductivity with high corrosion resistance in air expands the use of aluminum cables, often reinforced with steel, for high-voltage power transmission. Aluminum is also distinguished by its high thermal conductivity, which is used in engines, cooling systems and other devices.
The metal is easily polished mechanically and electrolytically, so it is also used for telescope reflectors and similar purposes. Aluminum is widely used as a packaging material and has the highest recycling recovery rate among other packaging materials.
In 1981, the share of recovered aluminum in the production of food containers was 53.2%, and by 1991 it reached 62.4% and continues to grow. Aluminum is highly resistant to corrosion due to the formation of an oxide film on its surface and is therefore used as roofing material, sheathing, and in daylight and infrared light reflectors.
Its corrosion resistance can be further enhanced by electrolytic anodic oxidation, known as anodizing, which increases the thickness and adhesion of the oxide film. The anodized surface is easy to paint, this method is often used for architectural panels
The corrosion resistance of aluminum, combined with its beautiful appearance, ensures its widespread use in refrigeration technology. Aluminum is a strong reducing agent and is used to separate less reactive metals and as an antioxidant in the production of steel and explosives. Aluminum powder is used in finishing works.
Aluminum paint is resistant to industrial emissions and exhaust gases, therefore it is widely used as a protective coating on the facades of metal structures, oil tanks, railway equipment and other structures.
Aluminum foil is a shiny insulating material used for food packaging and cooking, as a decorative covering for books, lettering, and in the manufacture of electrical capacitors.
Aluminum powder is used in powder metallurgy for the manufacture of precision parts, and also serves as an additive in solid propellant for rocket engines. Thermite mixture is widely used as a welding material for repairing thick-walled structures, for example for welding steel rails.
Properties of aluminum
A remarkable property of aluminum is its lightness; The density of aluminum is approximately three times less than that of steel, copper or zinc. Pure aluminum is a soft metal, but forms alloys with other elements to provide a wide range of useful properties. In terms of thermal conductivity and electrical conductivity, aluminum ranks after silver and copper.
Aluminum is highly reactive, so it does not occur in nature in a free state. Metallic aluminum dissolves quickly in hydrochloric acid to form AlCl3 chloride, and more slowly in sulfuric acid to form Al2(SO4)3 sulfate, but it reacts with nitric acid only in the presence of mercury salts.
In reaction with alkalis it forms aluminates, for example, with NaOH it forms NaAlO2. Aluminum exhibits amphoteric properties, as it reacts with both acids and alkalis. In air, aluminum is quickly covered with a durable protective film of Al2O3 oxide, protecting it from further oxidation.
Therefore, aluminum is stable in air and in the presence of moisture, even when heated moderately. If the protective film of the oxide is broken, then when heated in air or oxygen it burns with a bright white flame. When heated, aluminum reacts actively with halogens, sulfur, carbon and nitrogen. Molten aluminum reacts explosively with water.
PROPERTIES OF ALUMINUM
- Atomic number 13
- Atomic mass 26.9815
- Isotopes stable 27, unstable 24, 25, 26, 28, 29
- Melting point, ° C 660
- Boiling point, ° C 2467
- Density, g/cm3 2.7
- Hardness (Mohs) 2.0-2.9
- Content in the earth’s crust, % (wt.) 8.13
- Oxidation states 3