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Conformal Coating Spray Equipment & Booths FAQs
How do I set up a conformal coating spray facility?
SCH have written a technical bulletin on this topic. Select this from the Technical Bulletin area of the website, click here to link directly or request a copy through sales@schservices.com .
How do I spray PCBs with coating without ruining the ESD board I am spraying onto and meeting ESD requirements?
There are several ways and no ideal solution. Basically, you can spray onto boards that are covered in paper or ESD bag material which will then earth to the turntable of the booth. Since the operator should be earthed via the ESD points or the floor then you creating good protection for the device.
However, it is important to change the material regularly since a build up of coating turns the material to an insulator fairly quickly!
How does the extraction & filtration system work in the spray booth?
The Two layer mesh filtration means that the filters used are formed from two layers. A rougher, thicker, less dense filter is used on top and the coating is prayed on to this one(which is also less costly to replace) and a finer, thinner, more dense filter is used on the bottom to give you a laminate air flow.
The extraction should be fitted by a local air conditioning company to the customer. Due to the difficulties in supply of the correct extraction, which is dependent on location of booth to the exhaust chimney, local hse regulations, it isn’t practical for us in the UK to fit it.
The CFM is calculated from the fact that you need 0.7 m/s air flow through the spray booth to provide adequate extraction (this is a law in the UK). In order to work out the CFM we must multiply the face velocity by the area of the front aperture and then do the relevant conversion to get the figure into cubic feet per minute. The CB100 requires 3
What are the freight details for the spray booth?
A stamped crate is dimensions 1.75 x 1.0 x 0.85 m and weighs approx 150kgs.
Can you supply lighting fittings for the USA market?
No problem with supplying 60 hz lighting and plugs for the CB100. We can fit them for you.
What is the specification for the full face mask that can be utilised with the CB100 spray booth?
The Air Fed (CE) kit is a compressed air fed respirator supplied by compressed air passing via the visor. The Full Face Breathing Apparatus is supplied to EN166 and prEN1835:1995 standards.
The Air Fed (CE) system will provide protection against airborne dusts, mists, gases, and vapours. This visor offers respiratory protection to class 3 and hence offers a protection factor of up to 200. This means that it can be used in areas where concentration or contaminated in the workplace air is up to 200 times the Occupational Exposure Limit (O E L).
This system should not be used where the level of contaminated exceeds 200 x the O.E.L or where the contaminated or level is unknown. This system should be used in oxygen deficient atmospheres. This system should not be used below 0 degrees C
When would I use the full face mask option on the spray booth?
The full face mask option is ideal where highly hazardous conformal coatings are in use when spraying and any contact at all with the materials is dangerous.
Also, where stricter application and interpretation of HSE rules is in use at an organisation the inclusion of this particular PPE can be of help.
How are the filters supplied for the conformal coating spray booth?
Each set of filters comprises of two filters, one for left and one for the right side of the conformal coating booth. They are identical shape. The top filters are green in colour and are for rough filtering. The bottom filters are white in colour and are for fine filtering.
There are 4 x set of green and 1 x set of white filters in each pack. This keeps it simple for ordering (one type of pack only!).
For usage of conformal coating spraying typically change green filters once/week approx, change white filters once/month (one pack per month).