Classification of aluminum foil in details

Aluminum foil is a kind of very thin aluminium coil, strip or sheet obtained by rolling aluminium and aluminium alloy strip coil. Aluminum and aluminium alloy sheets and strips with thickness less than 0.2mm are generally referred to as aluminium foils.

Classification of aluminium foil:

According to the shape, it can be divided into rolled and flaky aluminum foil. Aluminum foil products are mostly supplied in rolls, and only a few handicraft packaging users use aluminum foil sheet.

According to the thickness, it can be divided into three kinds: thick aluminum foil, single zero aluminum foil and double zero aluminum foil. Thick foil is 0.1-0.2mm thick foil, single zero foil is 0.01mm thick foil and less than 0.1mm thick foil, double zero foil is thickness of the decimal point after two zero foil.

(3) According to the state, the main foils are hard aluminum foil, soft aluminum foil, semi-hard aluminum foil, one quarter of hard foil and three quarters of hard foil.

(4) According to the surface state, it can be divided into single-sided aluminum foil and double-sided aluminum foil.

(5) According to the use, it can be divided into packaging aluminum foil, commodity aluminum foil, electrical equipment aluminum foil and construction aluminum foil.

Properties of aluminium foil:

Aluminum foil has thin and light material, high specific strength, good gloss, high thermal conductivity and conductivity, high moisture-proof, non-toxic, tasteless, good optical rotation, thermal insulation and good corrosion resistance.

Aluminum foil for electromagnetic shielding

The shielding effectiveness of aluminium foil depends upon the type of incident field (electric, magnetic, or plane wave), the thickness of the foil, and the frequency (which determines the skin depth). Shielding effectiveness is usually broken down into a reflection loss (the energy bounces off the shield rather than penetrates it) and an absorption loss (the energy is dissipated within the shield).

Aluminum foil for electromagnetic shielding:

Excellent High Frequency RF Shielding characteristics

Effective barrier against Low Frequency AC Electric Fields when grounded.

Electrically Conductive

Weather Resistant

Can be used as a Vapor Barrier – not breathable

Heavy Duty / Tear Proof

Flexible and light weight which allows for an easy installation

Safe to handle and non-toxic

Although aluminium is non-magnetic, it is a good conductor, so even a thin sheet reflects almost all of an incident electric wave. At frequencies more than 100 MHz, the transmitted electric field is attenuated by more than 80 decibels (dB) — however actual energy absorption is minimal: the remaining high-frequency rf energy is almost perfectly reflected from uniform flat aluminium surface, and thus, reflected signal may continue to propagate internally, and if holes or passages of suitable geometry exist in the shield, signal propagation may continue out through those, the aluminium being good material for implementation of a microwave-frequency waveguide.

Thin sheets of aluminium are not very effective at attenuating low-frequency magnetic fields. The shielding effectiveness is dependent upon the skin depth. A field travelling through one skin depth will lose about 63 per cent of its energy (it is attenuated to 1/e = 1/2.718… of its original energy). Thin shields also have internal reflections that reduce the shielding effectiveness.For effective shielding from a magnetic field, the shield should be several skin depths thick. Aluminium foil is about 1 mil (25 μm); a thickness of 10 mils (250 μm) offers less than 1 dB of shielding at 1 kHz, about 8 dB at 10 kHz, and about 25 dB at 100 kHz. At these frequencies a ferromagnetic material such as mild steel is much more effective, due to different and complementary electromagnetic permeability properties, and common practical shielding implementations utilise both an inner high-frequency reflective material such as aluminium, preferably bonded (via annealing or electroplating, done to avoid capacitance between separated layers), to a more substantial structural ferromagnetic shell, usually mild steel (in specialized applications, more expensive, less structurally useful and less workable materials may be preferred.) Despite the relative low mass density of aluminium, this design is usually both lighter and more effective than an equivalently absorptive design utilizing aluminium alone.

What is the properties of aluminum foil

What is aluminium foil

Aluminium foil is a very thin sheet of rolled aluminium supplied in its pure form (‘commercial purity’) or in a variety of alloys and tempers which give a wide choice of tensile properties.

The thickness of aluminum foil sheets ranges from the thinnest currently produced commercially at about 0.0065 mm (or 6.5 µm) to the defined upper limit of 0.2 mm (or 200 µm). Material thicker than 0.2 mm is defined as sheet or strip.

Aluminium foils thicker than 25 μm are impermeable to oxygen and water. Foils thinner than this become slightly permeable due to minute pinholes caused by the production process.

Aluminium foil has a shiny side and a matte side. The shiny side is produced when the aluminium is rolled during the final pass. It is difficult to produce rollers with a gap fine enough to cope with the foil gauge, therefore, for the final pass, two sheets are rolled at the same time, doubling the thickness of the gauge at entry to the rollers. When the sheets are later separated, the inside surface is dull, and the outside surface is shiny. This difference in the finish has led to the perception that favouring a side has an effect when cooking. While many believe (wrongly) that the different properties keep heat out when wrapped with the shiny finish facing out, and keep heat in with the shiny finish facing inwards, the actual difference is imperceptible without instrumentation. Increased reflectivity decreases both absorption and emission of radiation. Foil may have a non-stick coating on only one side. The reflectivity of bright aluminium foil is 88% while dull embossed foil is about 80%.

The attributes of aluminum foil art

• Abundance – aluminium is plentiful with no danger of world depletion.

• Barrier efficiency to light, gases, oils and fats, volatile compounds and water vapour

• Temperature resistance from deep-freeze to oven processing

• Heat conductivity and reflectivity

• Electrical conductivity

• Strength and durability

• Compatibility with foods and pharmaceuticals

• Ease of lamination and coating

• Flexibility

• Formability and non-returning dead-fold

• Decorative potential, brilliant or matt surface

• Printability by flexo, gravure and offset litho

• Non-toxicity

• Low weight

• Recyclability

• Corrosion resistance

• Cost-effectiveness – optimum performance yet resource economy

Surface finish

Corrosion Resistance

The naturally-occurring surface oxide on all aluminium in the presence of oxygen in the atmosphere acts as a shield and renders foil substantially corrosion resistant. Aluminium is also chemically resistant in contact with substances in the pH range 4 to 9.

Compatibility with food and chemicals

Non-reactive except to substances of high acidity or alkalinity (see Corrosion Resistance). Resistant to most common compounds in solution.

Formability

Dead fold

Non-absorbency

Non-absorbent and proof against grease, oil, water and other liquids.

Hygiene

Foil is sterile following annealing, and does not harbour or support the growth of bacteria.

Toxicity

Aluminium is present in many fresh vegetables and is non-toxic in amounts and compounds normally encountered. The metal does not accumulate in the body and is non-reactive with virtually all foods, drugs and cosmetics.

Taste, odour

Tasteless and odour-free, alu foil imparts no detectable taste or odour to foodstuffs.

Opacity

Foil is a solid metal. It transmits no light and is a total barrier to light including the UV spectrum.

Reflectivity

Reflects approximately 98% of radiant heat and light.

Non-magnetic

Aluminium is insignificantly magnetic and therefore provides excellent electrical shielding.

Recyclability

Aluminium is easily recycled. Plain aluminium foil can be compacted and re-melted. Laminated aluminium is processed to separate the supporting layers and the aluminium residue is reused in other applications. In addition, the energy contained in the thin foil component of a laminate can be recovered in the form of heat.

How to make an aluminum foil pipe

The aluminum foil pipe is made of aluminum foil and stainless steel.We have a variety of aluminum foil tubes with diameters for your choice.

How to make an aluminum foil pipe

1.Get a large square of aluminum foil and uses for aluminum foil. Take a 12″ square piece of tin foil or aluminum foil .

2.Fold it in half. Fold the square of foil in half, being careful to keep the foil free of wrinkles and tears.

3.Fold it in half again.

4.Create a cone. Roll the square into a tube that is slightly flared at one end (like a very narrow cone).

5.Find the beginning of the bowl.

6.Create the bowl.

7.Add the smokeable material. Insert smoking material of your choice into bowl. You may or may not way to add an aluminum filter before adding in the material.

Specifications of aluminum foil pipe:

1.Full flexible, suitable for medium pressure air conditioning and ventilation system

2.It’s a range of fully flexiblility, easy to connect with ducting

3.Excellent resistance to chemicals

primary competitive advantages of aluminum foil pipe:

1.No need special tools for cutting

2.In case of fire no toxic gas are emitted

3.The product have been successfully tested for fire resistance

4.Can be bent in any direction

Structure: High elastic wire, aluminum foil

Standard Diameter: 3, 4, 5, 6, 8, 10, 12, 14, 16 inches

Standard Length: 3-10M

Temperate range: -30 degree to + 350 degree

Air Velocity: 28m/s

Working Pressure: 250mmAq

Color: Silver

Material: Aluminum Foil

Packing: PE Plastic Packing+Carton Packing

Product Description

Insulated flexible duct made of aluminum foil + pet +steel wire +glass fiber.

Acoustic insulated duct made of aluminum foil + pet + helix steel wire + fiber glass

Apply for low/medium/ high pressure, use for air ventilation in each environment.

Round style, and easy to install oval or round connection.

Fireproofing, at high temperatures or in case of fire, no toxic gas emitted.

Easy to delivery.

Good insulated—heat insulated

Absorb noise—can absorb the noise from the shaking when ventilated

No corrosive—not corrosive the aluminum pipe and metal parts

Durability—not decay, mildew

Fire—resistance

Applications and benefits:

1. Can be used for exhaust venting bathroom vents, clothes dryers, range hoods, fireplace etc.

2. High resistant to corrosion and micro organisms.

3. High degree of flexibility, which allows it to be easily connected to any desired position, especially where pre-cast ducts would be difficult and costly to be installed and can be bent into any configuration.

4. Quick and economical means of correcting misalignment between systems components.

5. Low friction loss and no air leakage if it’s installed in the right way.

6. Low cost in freight and storage.

What is extra heavy duty aluminum foil

Sometimes you need something a little stronger than standard aluminum foil. That’s where heavy duty aluminum foil comes in. Our heavy duty foil offering is ideal for tough jobs like:

lining pans for use in the oven

freezing meals ahead or storing leftovers

making foil packets to lock in moisture and flavor when you grill

Where this really matters is when you’re using aluminum foil for cooking. Since regular aluminum foil is thinner than the heavy-duty version, it doesn’t stand up to high heat and weighty items as well.

Heavy duty aluminum foil offers perfect protection against both high heat and freezing cold. Heavy Duty Foil is also available in a wider 18 inch roll, making it perfect for covering or lining larger roasting pans or making or folding larger foil packets.

Aluminum foil rolls and sheets come in a variety of thicknesses, widths, and lengths. Manufacturers often make the width and length of the foil roll easy to find, but the thickness of the foil is often not advertised. Most manufacturers use terms like standard duty, heavy duty, and extra heavy duty to describe foil thickness. Finding the actual thickness from a foil box or manufacturers website is not likely.

This type of heavy duty foil is thicker and sturdier than regular aluminum foil. It’s tough enough to stand up to high heat, heavy food items, and long-term storage in the freezer. Because of the extra thickness, it’s also a better choice for campfire packets.

Regular /Standard Duty and extra heavy duty aluminum foil are made of the same material, but there’s a key difference: the thickness of the foil.

Standard Duty Aluminum Foil – Most standard duty aluminum foil rolls are economical aluminum foil rolls for commercial and home aluminum foil sheets use. Home use standard duty foil rolls are often between 75 ft. and 250 ft. long, offered in a variety of widths. The majority of foil rolls labeled as “Standard Duty” are between .0004 thick and .0007 thick. Which at best is slightly over or one half of a mil in thickness.

Thickness of Aluminum Foil

Heavy Duty Aluminum Foil – By far the most common aluminum foil used for home and commercial use. Most home users buy 75 ft. rolls of Reynolds aluminum foil or a comparable brand for home use. Heavy duty foil provides extra strength and tear resistance. Many cooks use it for baking, grilling, and storage. Most Aluminum foil rolls labeled “Heavy Duty” are between .0008 thick and .001 thick. The extra three thousandths of an inch makes a big difference for a variety of applications.

In a word,This extra-heavy duty aluminum foil comes in a box with a standard cutting edge. It is good for use in cooking, serving and freezing food. Lining pans with roll before cooking makes cleanup easy. Use for grilling to lock in flavor and for freezing to prevent freezer burn. Material(s): Aluminum; Length: 500 ft; Width: 18 in; Packing Type: Box.

What are the processes of aluminium foil for air conditioning

There are two processes for aluminium foil for air conditioning:

(1) Cast rolling -cold rolling trimming -cold rolling -box rolling slitting- finished product annealing -packaging.

(2) Ingot -homogenization annealing -hot rolling -cold rolling- trimming cold rolling -box rolling slitting -finished product annealing -packaging.

Aluminum foil can be divided into industrial aluminum foil and packaging aluminum foil. The chemical composition of industrial aluminium foil is relatively pure, and its thickness is 0.005-0.2 mm. It is mainly used as capacitors, insulation materials and moisture-proof materials in electrical and electronic industries. The thickness of packing aluminium foil is generally 0.007-0.1 mm. There are many kinds of products, such as flat foil, printing foil, colored printing foil and laminated foil. They are mainly used as packaging materials for food, tea, cigarettes, etc.

The smaller thickness and width of aluminium foil produced by belt production method can reach 0.0025 mm and 1800 mm respectively.

Aluminum foil rolling is seamless rolling, and the rolls are always in the state of elastic flattening. During rolling, the thickness of alu foil can be controlled by adjusting rolling force, rolling speed and tension. In rough rolling, the thickness ofalu foil is controlled by rolling force; in finishing rolling, the alu foil thickness decreases with the increase of rolling speed; the greater the tension, the smaller the thickness; in order to prevent fragmentation, the tension is usually chosen as 0.2-0.4 of standard yield strength_0.2 of foil.

In low-speed rolling, the “thick oil-a00 aluminium plate rdquo” is often added to lubricating oil, or “thin oil” is used to adjust the rolling thickness of aluminium foil. Lubricant and roll condition have a very important influence on aluminium sheet foil quality.

Aluminum foil billet comes from cold rolled aluminium coil. It is generally pre-annealed at 340-480 C, and its thickness is 0.4-0.7mm. The pass deformation rate is about 50% and the total deformation rate is over 95%. The foil whose finished thickness is less than 0.01-0.02 mm should be rolled and rolled in double sheets.

What thickness is used for packaging aluminium foil

What thickness is used for packaging aluminium foil?

Generally, the thickness of packaging aluminium foil is between 0.03mm and 0.1mm.

Due to the full insolation of the packaged goods from the outside light, humidity and gas, the packaged goods are well protected. Especially for the packaging of cooked food, the use of this composite aluminum foil material can ensure that food does not deteriorate for at least one year. Moreover, heating and unpacking are very convenient and popular with consumers.

Aluminum foil has a clean, hygienic and shiny appearance. It can be integrated with many other packaging materials, and the printing effect of the surface of aluminum foil is better than that of other materials. In addition, aluminum foil has the following characteristics:

(1) The surface of aluminium foil is extremely clean, sanitary, and no bacteria or microorganisms can grow on it.

(2) Aluminum foil is a non-toxic packaging material, which can be directly contacted with food without any health hazards.

(3) Aluminum foil is a odorless and odorless packaging material, which will not make the packaged food have any odor.

(4) If the aluminum foil pans itself is not volatile, the packaged food will never dry or shrink.

(5) Whether at high temperature or low temperature, there is no oil infiltration in aluminum foil.

(6) Aluminum foil is an opaque packaging material, so it is a good packaging material for sunshine products, such as margarine.

(7) Aluminum foil has good plasticity, so it can be used to package products of various shapes. It can also create containers of various shapes at will.

(8) Aluminum foil has high hardness and tension strength, but its tearing strength is small, so it is easy to tear.

(9) Aluminum foil itself can not be heated and sealed, so it must be coated with heat-resistant materials, such as PE, in order to be heat-sealed.

(10) Aluminum foil may have adverse reactions when it comes into contact with other heavy metals or heavy metals.

Characteristics and application of aluminum foil packaging bag

Aluminum foil packaging can be tailored to different specifications and styles of packaging bags, mostly using four-layer structure, with good water and oxygen insulation function.

Aluminum foil packaging surface will generally have reflective gloss, which means that it does not absorb light, but also uses multi-layer production. Therefore, aluminum foil paper not only has good shading, but also has a strong isolation, and because of the aluminum component in it, it also has good oil resistance and softness.

Aluminum foil packaging bags have strong air barrier, anti-oxidation, waterproof, moisture-proof, strong mechanical properties, high explosion resistance, puncture resistance and tear resistance. Aluminum foil packaging bags have good heat resistance, low temperature resistance, oil resistance and fragrance retention. It is non-toxic and odorless, and meets the hygienic standards of food and drug packaging. Good heat sealing performance, flexibility, high barrier performance.

Aluminum foil packaging bags are suitable for packaging various circuit boards, electronic products, precision machinery accessories, consumer goods, industrial products, etc. For example: PC board, IC integrated circuit, electronic components, SMT patches of all kinds of LED wilderness, lamp packaging, precision hardware, auto parts and other packaging.

Aluminum foil for food packaging: rice, meat products, dried fish, aquatic products, roast duck, frozen food, condiments, etc., fragrance preservation, quality preservation, flavor preservation, color preservation.

Double sided reflective aluminum foil insulation material

Aluminum foil thermal insulation can be used to multiple places where it can be found useful for stopping unwanted heat gain or heat loss. Aluminum foil insulation works effectively and efficiently and prevents the transmission of temperature that at the end results into wastage of energy.

Not your typical aluminum foil, our aluminum foil insulation is comprised of two layers of highly reflective aluminum reinforced with polyethylene woven fabric that gives the aluminum insulation an incredible tear resistance factor making it more durable that most radiant barriers in the market place.

Why aluminum foil insulation?

The barrier properties and heat reflectivity of aluminium foil are widely used in building panels to improve insulation performance in modern building systems.

Aluminum thermal insulation is work on the radiant barrier principal that reflects the temperature and sun rays back to atmosphere from where they are coming from. And it works in both hot and cold environment by reflecting high temperature rays to the direction of source. The same can enhanced with the use of polyethylene bubble insulation film that sandwiched between the aluminum foil. Though aluminum insulation reflects around 97 percentage of sun rays and radiant heat, remaining can be stop passing to home by air bubble film. And this is why most of the radiant barriers are the best choice for home and industrial temperature insulation.

Aluminium foil is used as a skin for heat-insulating and incombustible materials to provide high performance insulation for pipe work and ducting.

The adhesive tape used to secure the laminated material is based on aluminium foil or its reflective surface, corrosion-resistance and long life.

In electrical cables, aluminium foil helps give long-term insulation against moisture and attack from naturally occurring corrosive elements found above and below ground.

Aluminium foil also acts as an insulator against the magnetic and radio frequency emissions associated with electrical cables.

As a sheath for fiber-optic cables, aluminium foil uses its electrical conductivity to act as a “tracer” to enable testing of the integrity of cable links – as well as helping to provide the long-term protection every cable needs.

In fire walls for vehicles and fireproof doors and building panels, aluminium foil stops access to the oxygen required to support flames.

This aluminum roof insulation is used to provide protection against the higher cold also as it reduces the temperature loss to outers surface of the home roof or wall. Particularly for the building that are made with higher amount of glass or steel. Whatever needs to be of keeping the close room at a constant temperature, it can be benefited with the use of radiant aluminum foil.

Studies have shown that radiant heat transmission is responsible for the highest amount of heat gain or loss in the building structure. During the hard summer, the ceiling or roof and wall of the building absorb radiation from the sun rays and transmit it inside the home. The same heat is then transmitter towards the attic room. However, most of the sun rays and heat is transmitted outside when radiant aluminum foil insulation is used. Also during the colder period the same thermal barrier stops the wastage of energy by reflecting cooler temperature towards the interior of the building. A properly installed aluminum thermal barrier stops 97 percentage of the heat transfer and saves money and energy both.

Aluminum foil on windows with many useful uses

Aluminum alloy is a silver solid. Available as sheets, strips, foil, shots, wire, powder, and granules. melting point of aluminum foil: 2327 oC Melting point: 660 oC ,so it is safe.

So aluminum foil or called tin foil is often used in the kitchen, but some people use it for other reasons as well, such as covering windows elsewhere in the house. Foil is used in this way for a variety of reasons. The properties of tin foil make it useful in multiple applications.

Tin foil works effectively to block radiant heat. Because of this, some people use it to block the heat of the sun by securing it over windows. The foil is simply placed over the glass window panes — on the inside of the house — and secured with tape. Because tin foil is resistant to heat, it prevents much of the sun’s heat from entering the house. This helps cut down on energy costs because the air temperature inside remains more constant, despite the sun’s location and the temperature outside.

why aluminum foil on windows becoming more and more popular?

The gold aluminum foil is a solid metal that you cannot see through. The foil is a low-cost alternative to blinds and other window coverings. If a person lives on a bustling block filled with passersby, covering windows in tin foil grants him the ability to be in his home without being seen.

Prevent Glares

The physical properties of tin foil make it an impenetrable barrier to light. The positioning of some windows allows light to shine brightly into the home as the sun rises and sets, which may create an unwanted glare. The light can shine into bathrooms, making it difficult to apply makeup in a bright mirror, and it can create glares on television and computer screens. Covering these windows with aluminum foil prevents the sun from shining brightly into rooms and allows for shade. For similar reasons, some people who work overnight shifts cover their bedroom windows with aluminum foil to help them achieve total darkness for easier daytime sleeping.

Aluminium Foils Costs and Benefits

Aluminum foil is inexpensive. It is a low-cost substitute for window curtains or energy-efficient window treatments. Aluminum foil is also malleable, which makes it easy to conform to different window shapes. It keeps its shape, so as long as it is secured with tape, it will not detach or shrink away from the windows. Although not particularly decorative, tin foil is a practical choice for covering windows.