Selective application of conformal coating in this case is applying the conformal coating without using masking to shield components from ingress.
Technically, using masking tapes, latex and boots is a selective process. But, we are looking at coating applications without masking. This leaves a couple of different options.
The first is brushing. This is a simple selective process that can be highly effective.
The second, and the more obvious option, is selective robot. This process uses a small spray valve (there are many conformal coating spray valve types) that is attached to a robot that follows a set pattern applying the conformal coating selectively to the circuit board.
Advantages and disadvantages of selective conformal coating robots
The five advantages and disadvantages of selective application of conformal coating are:
Advantages
- Masking can be eliminated or minimised
- High speed coating process
- High volume process
- High quality finish when under control
- Simple process to operate when set up
Disadvantages
- High engineering skill required for set up and programming
- High engineering skill required for troubleshooting and supervision
- High capital cost initially
- Process controls need to be enforced for good quality production
- Environment can influence the process controls
Find out how we can help you with your conformal coating process now.
SCH supports OEMs and EMS providers with a fully integrated total-solutions approach to conformal coating and Parylene—spanning in-house process development through to fully outsourced production. Our focus is on delivering coating strategies that are technically robust, commercially viable and scalable, from early prototype through to full-rate manufacture.
For manufacturers operating their own coating lines, we provide comprehensive engineering support including PCB design reviews, conformal coating line set-up, Parylene deposition equipment, masking optimisation, SPC and control planning, and operator training. We also support NPI programmes, helping teams validate chemistries, define robust masking strategies, optimise equipment parameters and benchmark new materials or processes prior to volume release.
For organisations outsourcing coating, SCH delivers fully managed coating services covering both liquid conformal coatings and Parylene. These services are underpinned by structured technical consultancy, specification development and detailed troubleshooting and failure analysis. Whether addressing a short-term process issue or establishing a long-term coating partnership, we ensure assemblies meet demanding environmental and reliability requirements.
At every level of engagement, SCH provides tailored training and technical consultancy, including process benchmarking, defect prevention, troubleshooting, design-for-coating guidance, and on-site or remote support for engineering and quality teams.
Whether your requirement is technical guidance, equipment supply, production capacity, NPI validation or continuous process improvement, SCH delivers end-to-end support across the complete coating lifecycle.
Find out more about our:
👉 Conformal Coating Solutions
👉 Parylene Solutions
Contact us now to discuss your needs and let us explain how we can optimize your process for you.
Call: +44 (0)1226 249019
Email: sales@schservices.com
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