The compatibility of PC (polycarbonate) with UV laser marking machines is no accident; it stems from the high alignment between PC’s material properties and the "cold processing" principle of UV laser marking. This alignment spans chemical, physical, and application scenarios, ultimately enabling high-quality marking.   From a chemical perspective, the molecular bond energy of PC (approximately 3.0-4.0 eV) perfectly matches the photon energy of UV lasers (about 4.6 eV for 266 nm lasers and 3.5 eV for 355 nm lasers). This energy compatibility allows UV photons to directly break the molecular chains on the PC surface without converting into heat. Two outcomes result: either the molecules recombine to form conjugated double bond structures, creating dark marks on transparent/light-colored PC (with changes limited to the 5-10 μm surface layer, leaving internal transparency unaffected); or the molecules sublimate to form micro-scale shallow indentations, easily producing clear markings.   In terms of physical properties, PC has moderate heat resistance (prone to deformation at 130-140°C). Traditional thermal processing marking (e.g., fiber laser marking) causes edge burning and yellowing due to high temperatures. In contrast, UV laser marking is a "cold processing" method with almost no heat accumulation. It avoids PC deformation and transparency damage, perfectly overcoming PC’s "heat sensitivity" weakness.   Regarding application adaptability, PC is used in diverse scenarios (transparent, white, industrial parts). The parameters of UV laser marking machines can be flexibly adjusted: lower power for invisible codes on transparent PC, higher power for logos on white PC, and micro-sublimation for wear-resistant markings on industrial parts. Additionally, it avoids ink contamination, meeting the requirements for PC use in electronics, medical, and food industries.   It is precisely this "chemical energy matching + physical heat-free damage + flexible application adaptation" that enables PC materials to be efficiently and high-quality marked by UV laser marking machines.