Instruction Manual

Introduction 1-3

Table 1-1 Asymtek Conformal Coating Dispensing Systems

Dispensing Systems Process

SL-940E Conformal Coating System Inline

SL-941E Conformal Coating System Batch

Century Series C-740 Dispensing System Inline

Century Series C-741 Dispensing System Batch

Century Series C-341 Benchtop Dispensing System Batch

After the conformal coating has been applied, it must be cured or hardened (Step 2). 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

1.6.2 Coating Materials

There are several materials 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:

 Why are you applying conformal coating? (humidity, vibration, thermal shock, solvents, etc.)

 Will the PCB 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 Volatile Organic Compounds (VOC’s) a major concern for your facility?

 Will you be reworking the PCB?