Physical properties of aluminum

Silver white light metal. It has extensibility. Products are often made into rods, sheets, foils, powders, ribbons, and filaments.

A layer of oxide film can be formed in humid air to prevent metal corrosion.

Aluminum powder can burn fiercely when heated in the air and emit a dazzling white flame.

Easily soluble in dilute sulfuric acid, nitric acid, hydrochloric acid, sodium hydroxide, and potassium hydroxide solutions, but insoluble in water.

The relative density of aluminum is 2.70, the relative density of iron is 7.80, and the density of aluminum is only one-third of that of iron.

The melting point of aluminum is 660 ℃, the melting point of iron is 1535 ℃, and the melting point of ordinary steel is around 1500 ℃. Aluminum has a very low melting point, and when encountering high temperatures or a fire, aluminum products will quickly melt and even burn to support combustion. Although the temperature of wood flame combustion is fluctuating, the temperature of the core is generally around 600-800 ℃, and the temperature of the edge flame is generally 1000-1300 ℃. The visible blue edge flame temperature is at least 1400-1600 ℃, which means that wood combustion is sufficient to melt aluminum products. Some people may doubt this data, is wood burning really at such high temperatures? The temperature of cigarette butts where people smoke is visible to the naked eye, at least 800 degrees red! At the moment of smoking, the cigarette end can be seen shining, and the temperature at this time is at least 1200 degrees. These are all measured by professionals using specialized instruments.

The tensile strength of pure aluminum is 90-120MPa, and the yield strength is around 20-90MPa. The tensile strength of Q235 iron plate commonly used for anti-theft door panels is generally around 235MPa, and the yield strength is around 375-460MPa; Anbang Yongtai is a bulletproof material used for bulletproof and explosion-proof doors and windows. It is currently the most advanced bulletproof material in the world, with a tensile strength of 1600-1700MPa and a yield strength of around 1300-1500MPa. Aluminum has a face centered cubic structure and therefore has high plasticity（ δ: 32-40%, ψ: 70-90%), easy to process, can be made into various profiles and plates. But the strength of pure aluminum is very low, and it is in an annealed state σ The value of b is about 8kgf/mm2, so it is not suitable for use as a structural material.

Cast aluminum door

The advantage is that it can enhance the three-dimensional sense of the facade design, give a thick and heavy feeling, and feel high-end and safe. However, due to the natural properties of aluminum, such as low density, low strength, and poor corrosion resistance

The characteristic of poor fire resistance makes it very unsuitable for use as a bedroom door, especially for bulletproof, explosion-proof, and fireproof purposes. The biggest problem is the deep harm of aluminum to the human body.

Toxicological properties of aluminum

Research has found that aluminum can damage human brain cells. According to the evaluation of the World Health Organization, the daily intake of aluminum is set at 0-0.6mg/kg, where kg refers to a person's body weight, i.e

The allowable intake for a person weighing 60kg is 36mg. According to the "Standard for the Use of Food Additives GB2760-2011" in China, the residual amount of aluminum should be less than or equal to 100mg/kg. Based on this calculation, an individual

People weighing 60kg need not worry if they eat no more than 360g deep-fried dough sticks every day.

Aluminum slowly accumulates in the human body