Manual

Introduction 1-3
Asymtek offers an automated solution to the conformal coating process by offering Automated Selective
Coating. Unlike other methods, Automated Selective Coating achieves high throughput, dispensing
consistency, and material savings with little or no masking. Asymtek Conformal Coating Systems are
listed in Table 1-1.
Table 1-1 Asymtek Conformal Coating Dispensing Systems
Dispensing Systems Process
Century Series C-341 Benchtop Dispensing System Batch
Century Series C-740 Dispensing System Inline
Century Series C-741 Dispensing System Batch
After the conformal coating has been applied, it must be cured (hardened). The curing method depends on
the coating material. Most materials are cured by one of the following processes:
• Heat (infrared), using an infrared or convection oven
• UV (ultraviolet) light, using a UV oven
• Moisture (humidity), using ambient conditions or a humidity controlled environment
Asymtek offers the Curing Systems listed in Table 1-2:
Table 1-2 Asymtek Conformal Coating Curing Systems
Curing Systems Process
Flexible IR/Convection Module Infrared
Select Cure UV-5 Cure Module UV
Select Cure UV-6 Cure Module UV
7 ft. Humidified Conveyor Moisture
1.5.2 Coating Materials
There are several materials that are commonly used for conformal coating purposes: These include:
• AR = Acrylics • UR = Urethanes
• SR = Silicones • ER = Epoxy
• XY = Paralyne
The selection of a coating material is application dependent and is based on a variety of factors: Material
considerations include the following:
• What are you trying to protect against? (solvents, humidity, vibration, thermal shock, etc.)
• Will the PWB be cleaned prior to coating?
• What type of cure mechanism are you planning to use? (UV, IR, Convection, Humidity)
• Will the coating selected meet the environmental requirements of your industry or location?
• Are VOC’s a major concern for your facility?
• Will you be reworking the PCB?