anti static plastic sheet materials in many occasions, to withstand the role of a variety of mechanical stress, a constant, vibrating, thermal expansion and contraction cycle. These stresses can cause creep damage or fatigue damage.
DMD insulation paper material moisture will increase the conductivity, increase the loss. Water also dissolves many substances and accelerates the various chemical reactions that lead to aging. Acid, ozone, etc. can also lead to chemical aging. For some insulating paper materials, tree branches may occur at very low electric field due to the presence of moisture (see solid dielectric breakdown). In addition, in the hot zone, insulating paper materials will be subject to a variety of microbial damage, the so-called microbial aging.
In the outdoor use of phenolic paper sheet materials, often by direct sunlight, under the action of ultraviolet light will occur aging. In the nuclear reactor, X-ray devices used in the insulating paper material by radiation, will occur aging.