Conformal Coat

Category: Special Processing

Description: Conformal coating applies a film that ‘conforms’ to the contours of a PCB to protect its components against moisture, dust, chemicals, and temperature extremes. The coating can be applied by a variety of methods.

Major Cost Drivers -- PCBA Conformal Coat

Conformal Coat Cycle Time is the sum of the time to mask the locations that should not be coated, apply the conformal coat, remove the masking material, inspect the conformal coat, and touch up missing areas that need to be coated.

// Process Time to perform Conformal Coat.

Process Time = Masking Time + Conformal Coat Time + Demasking Time + Inspect Time + Touch Up Time

Masking Time = Masking Boot Install Time + Masking Die Cut Install Time + Masking Seal And Peel Install Time + Masking Tape Install Time

Masking Boot Install Time = Masking Boot Quantity* Masking Boot Install Time

Masking Boot Quantity = (PSO)

Masking Boot Install Time = (Machine variable)

Masking Die Cut Install Time = Masking Die Cut Quantity* Masking Die Cut Install Time

Masking Die Cut Quantity = (PSO)

Masking Die Cut Install Time = (Machine variable)

Masking Seal And Peel Install Time =Masking Seal And Peel Quantity* Masking Seal And Peel Install Time

Masking Seal And Peel Quantity = (PSO)

Masking Seal And Peel Install Time = (Machine variable)

Masking Tape Install Time = Masking Tape Quantity* Masking Tape Install Time

Masking Tape Quantity = (PSO)

Masking Tape Install Time = (Machine variable)

Conformal Coat Time =

If PSO “Method of Conformal Coat” = Hand Spray:
Hand spray: {( PCB Length* PCB Width)/(Hand Spray Deposition Rate)

PCB Length = (Global Input)

PCB Width = (Global Input)

Hand Spray Deposition Rate = (Machine variable)

If PSO “Method of Conformal Coat” = Machine Spray:
Machine spray: Machine Spray Load Time + Machine Spray Unload Time

Machine Spray Load Time = (Machine variable)

Machine Spray Unload Time = (Machine variable)

If PSO “Method of Conformal Coat” = Hand Brush:
Hand brush: Hand Brush (PCB Length* PCB Width)/( Hand Brush Deposition Rate)

Hand Brush Deposition Rate = (Machine variable)

If PSO “Method of Conformal Coat” = Machine Vapor Deposition:
Machine Vapor Deposition: Vapor Deposition Load Time +Vapor Deposition Unload Time

Vapor Deposition Load Time = (Machine variable)

Vapor Deposition Unload Time = (Machine variable)

Demasking Time = (Masking Boot Quantity + Masking Die Cut Quantity + Masking Seal And Peel Quantity + Masking Tape Quantity)* Mask Removal Time

Masking Boot Quantity = (PSO)

Masking Die Cut Quantity = (PSO)

Masking Seal And Peel Quantity = (PSO)

Masking Tape Quantity = (PSO)

Mask Removal Time (Machine variable)

Inspect Time = (Machine variable)

Touch Up Time = (Machine variable)

User Inputs –- PCBA Conformal Coat

PSO: Method of Conformal Coat (Machine Spray, Machine Vapor Deposition, Hand Spray, Hand Brush)

PSO: Quantity of Masking Boots (for test points/connectors)

PSO: Quantity of Die Cut Masking Locations (for potentiometers/keep-out areas)

PSO: Quantity of Seal And Peel Locations (for connectors)

PSO: Quantity of Masking Tape locations (for borders and keep-out areas)

Global Inputs: PCB Length, PCB Width