product name(anti fog-emi)country of origintianjin model1.56specificationsrefractive index: 1.557 color kd parameter: 36 yellow color index:0.79 diameter: 72~ a center thickness: 1.2~2mm perform standard: qb2506-2001 advantagesfunction:its principle is the surface of lens card, when the cold caloric replace the white fog air conversion that produce for a small aqua bead, hit the transparent result. characteristics:lens card both sides community 16 lay membrane, subject to joining the special metalloporphyrin membrane lay, the surface is pure and smooth, seeing through the rate high, defend the ability of spending strong, conduct electricity to transmit heat the function superiority, can defend the electromagnetism spreads to radiation, and also can longer and purple and outside light in the wave-length of blockade, another increase of defend the fog membrane lay with defend the cloth of fog lens counteract, can rise to defend the fog action. announcements:the lens card per se availability clear water purges, strictlying forbid to use the chemical drugs( for instance scouring elixir, soap, washing powder iso -) come to purge;because defend the fog lens cloth per se imply to defend the fog medicine aqua, so cant steer the purgation, if the mutation is dirty or the medicine aqua runs out, pleasing go together with the lens to buy to defend the cloth of fog lens afresh. diligentia:defend the fog lens card at below zero 25 degree withexport marketscold sectionpricingrmb:27payment detailsl/c t/tmin