Polyimide takes the heat of printed circuit board labelingPolyimide takes the heat of printed circuit board labeling

Called THERMLfilm and now available worldwide from FLEXcon (Spencer, MA), these polyimide films are said to be able to withstand the fluctuating temperatures, abrasion and chemicals inherent in the printed circuit board (PCB) manufacturing process. The new product line is foreseen for use in the high-density barcode and alphanumeric PCB labels, and was tested to ensure the labels will remain adhered and legible throughout the manufacturing process.

FLEXcon credits a topcoat it formulates with providing a smooth printing surface. The labels serve as substrates for high-density information such as data matrix codes and provide consistent ANSI scanning, says the company. The static dissipating qualities of the topcoat also help minimize the risk of print voids.

THERMLfilm HT meets MIL-STD-202G, Notice 12 and MIL-STD-883E, Notice 4. Barcode scanning testing reveals consistent ANSI scanning after exposure to high heat. Heat resistance testing has revealed endurance at 500°F (260°C) continuously for 5 minutes and intermittently at up to 750°F (398°C). The film also handled in-line durability testing performed using VIGON A 201 chemical cleaner.

The THERMLfilm HT products are available sized 1 and 2 mils' thick. FLEXcon's distribution centers keep material on hand for express shipping. Made-to-order products are also available on a 1.5-mil (37 micron) polyester liner and a 50 lb. (80 GSM) SCK liner to meet specific application and dispensing requirements.