Oak coffin and lead lined anti-corrosion

The preservation of British royal coffins is a typical representative of traditional European coffin preservation. The British royal family does not use cremation or burial, nor does it have special anti-corrosion treatment, but the secret to keeping the body odorless lies in its special coffin. The coffin shell is made of expensive rare oak, which has a high density, is not easily decayed, and has the function of isolating odors. Each corner of the inner layer of the coffin is coated with lead metal, which is also a high-density heavy metal with excellent sealing properties. It can effectively prevent microorganisms, bacteria, and other corrosive substances from entering the body, and maintain the integrity of the body to the greatest extent possible. After oxidation, lead can still react with human bones, keeping the body in good condition and preventing bone pits caused by calcium loss after death. After completion, this type of coffin usually weighs seven to eight hundred pounds. Nowadays, mechanical traction is fully used for burial, which has greatly improved burial speed and stability.

Modern coffin anti-corrosion treatment technology

（1） Chemical preservative treatment

Types of preservatives: In modern European coffin preservation treatment, there are various commonly used chemical preservatives. For example, anti-corrosion solutions containing toxic substances such as phenol, aldehydes, and heavy metals, such as Bu Du's moldy solution, or anti-corrosion solutions prepared with 0.05% PM agent and 10% ethanol. These preservatives achieve their anti-corrosion goals by denaturing and coagulating proteins, interfering with important enzyme systems of microorganisms, and disrupting the permeability of the original plasma membrane of spoilage bacteria.

Application method: Chemical preservatives can be applied to coffins through soaking, spraying, and other methods. Soaking is the process of immersing the entire or partial coffin in a preservative solution, allowing the preservative to fully penetrate the interior of the coffin; Spraying is the process of evenly spraying preservatives onto the surface of the coffin to form a protective film.

（2） Vacuum drying treatment

Principle: Vacuum drying treatment is to place the coffin in a vacuum environment, reduce the environmental pressure, and quickly evaporate the moisture inside the coffin, thereby achieving the purpose of drying and anti-corrosion.

Process: First, place the coffin into the vacuum drying equipment, seal the equipment, and then start the vacuum pump to gradually reduce the pressure inside the equipment. As the pressure decreases, the water inside the coffin begins to evaporate and is discharged through the drainage device on the equipment. When the moisture content inside the coffin reaches a certain level, stop the vacuum pump and remove the coffin.

（3） Low temperature freezing treatment

Method: Low temperature freezing treatment is to place the coffin in a low-temperature environment to freeze the water inside the coffin, thereby inhibiting the growth and reproduction of microorganisms. The common low-temperature freezing methods include ordinary freezing and liquid nitrogen freezing. Ordinary freezing is the process of freezing a coffin in an environment of minus 18 degrees Celsius; Liquid nitrogen freezing involves placing the coffin in liquid nitrogen at minus 196 degrees Celsius, gently shaking it, and the body will decompose into small particles with a diameter of about 5 millimeters.