És cert que el paper d'alumini en si no és un bon aïllant, perquè el paper d'alumini pot conduir l'electricitat.
El paper d'alumini té propietats d'aïllament relativament pobres. Encara que el paper d'alumini té certes propietats aïllants en alguns casos, les seves propietats aïllants no són tan bones com altres materials aïllants. Perquè en circumstàncies normals, the surface of aluminum foil is susceptible to oxidation or corrosion, forming conductive oxides or corrosion products, thereby reducing its insulation performance.
There is a close relationship between the conductivity and purity of paper d'alumini. En general, the higher the purity of the aluminum foil, the better its electrical conductivity and the higher its conductivity. Per tant, in practical applications, aluminum foil is usually not used as an insulating material, but is more often used to make conductive parts or as a conductive material.
Aluminum foil is conductive. The conductivity of aluminum foil depends on its manufacturing process and purity. En general, the higher the purity of the aluminum foil, the better the electrical conductivity and the higher the conductivity. Under standard temperature and pressure, the conductivity of aluminum foil is usually between 35-50MS/m.
De fet, aluminum is known for its excellent thermal conductivity because it conducts heat so well. No obstant això, when used as a radiant barrier or reflective insulation, aluminum foil can effectively reduce heat transfer by reflecting radiant heat. If aluminum foil is placed with the light side facing out in an area where heat is to be reflected, such as behind a radiator or a window, it can help reflect radiant heat back into the room, potentially improving energy efficiency.
Although aluminum foil is not a good insulator in the traditional sense, it serves a very important purpose in other ways.
