We just sprayed PCBs with UV40 through a selective robotic system. However, we were unable to cure immediately with our UV conveyor and had to wait 3 days whilst the boards were wet. However, they didn’t cure? Why does the UV40 secondary cure mechanism state 2-3 hours pot life?We only had them in light for a short period and they were stored in dark drying cabinets most of the time.
Humiseal UV40 is more sensitive to light than moisture and that is why after 3 days it was still not cured. Also, the humidity level in the drying cabinet was probably quite low. The catalyst in the UV40 should not degrade with time.
The Humiseal UV40 TDS states 2 to 3 hours of pot life if for example you have a dip tank full of UV40 exposed completely to light and moisture. When the viscosity of a conformal coating is increasing by double of its initial value then the pot life has been reached. This is the definition of the pot life. It would still be dippable but you will not have the same consistency (film thickness, homogeneity, etc…)
Click for further information on Humiseal UV4o conformal coating.
UV curing of conformal coating using UV100 conveyors
UV curing of conformal coatings is becoming increasingly important for high volume users in fields such as automotive and consumer electronics.
This increase in the popularity of UV curable conformal coatings is due to its rapid cure speed, level of processing ease, environmental friendliness and thermal cycling resistance, which have never before been achieved with UV conformal coating materials.
The UV100 UV Curing Conveyor System
The super fast curing times of UV conformal coatings mean that productivity in your conformal coating process can be massively increased.
This means you won’t have wet boards lying around susceptible to contamination from dust and debris, your lead times can be reduced and your customers get their products quicker!
To take advantage of these benefits you need a UV curing system like the UV100 UV conveyor. The UV100 range of UV conveyors are available in modular format:
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Click here for further information on the UV100 conveyor
Video of UV conformal Coating of UV40 in UV Cure Conveyor
There is now a Video of a UV Cure Conveyor curing UV40 conformal Coating of UV40 on a circuit board.
UV curing of conformal coatings is becoming increasingly important for high volume users in fields such as automotive and consumer electronics.
This increase in the popularity of UV curable conformal coatings is due to its rapid cure speed, level of processing ease, environmental friendliness and thermal cycling resistance, which have never before been achieved with UV conformal coating materials.
The super fast curing times of UV conformal coatings mean that productivity in your conformal coating process can be massively increased.
This means you won’t have wet boards lying around susceptible to contamination from dust and debris, your lead times can be reduced and your customers get their products quicker!
To take advantage of these benefits you need a UV curing system like the UV100 UV conveyor. The UV100 range of UV conveyors are available in modular format:
Follow the link to see the video of UV40 being cured on a UV cure conveyor.
UV cure conformal coatings – All the FAQs you need!
SCH have a range of FAQs on UV cure conformal coatings and how UV curing works. These FAQs include what is UV radiation, What type of UV light is used in Conformal Coating Inspection and the conformal coating spray booths and what is Humiseal UV40 and how does it differ to solvent and water based coatings like 1R32, 1B31 and 1R32A2?
There are also a range of FAQs on UV conveyors & ovens and how they interact with the UV conformal coatings.
Click here for information on conformal coating UV cure equipment and UV conformal coatings.
Conformal Coating 