Subcontract Cleaning of Printed Circuit Boards for long term reliability improvements

Subcontract cleaning of circuit boards is now available from SCH. Cleaning of printed circuit boards (PCBs) can be a a critical factor in long term reliability whether conformal coating is applied or not. SCH have cleaning systems for cleaning PCBs using aqueous washing in a four stage batch cleaning process.  Cleaning fluids available include CKS510 from Humiseal, safewash from  Electrolube and Zestron A200.   

Also available are ionic cleanliness testing for the PCBs if required.  Ionic extraction or Resistivity of Solvent Extract (ROSE) testing allows process control of aqueous and semi aqueous cleaning for bare and assembled printed circuit boards, compliance to industry specifications including MIL-STD-2000A, IPC-TM-650 and ANSI/J-STD-001, cleanliness testing to minimise corrosion or product performance problems associated with ionic contamination and process control of no clean processes.

Contact SCH or use the website www.conformalcoating.co.uk for further info on subcontract cleaning service.

PVA conformal coating selective Robot for sale

SCH have a PVA selective conformal coating spray system available for sale.

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Acrylic Conformal Coatings from Humiseal available from SCH

Humiseal have a range of acrylic conformal coating materials that are commercial grade, UL and mil spec qualified for all areas of conformal coating application.

The acrylic conformal coatings included in Humsiseal’s range include solvent and water based conformal coatings. 

For the solvent based coatings there are 1R32, 1R32A2, 1B12, 1B31, 1B66, 1B73 and 1B18 plus variations on solvent content such as 1B73EPA, 1B73LOC, 1B31EPA, 1B31LOC .

The technical datasheets for 1R32, 1R32A2, 1B12, 1B31, 1B66, 1B73, 1B18, 1B73EPA, 1B73LOC, 1B31EPA and 1B31LOC solvent based acrylic conformal coatings are available on SCH’s website.

Click for further information on the solvent based acrylic conformal coatings.

For the water based coatings there are 1H20 AR1/S, 1H20 AR1/D, 1H20 AR3/S  and 1H20 AR3/D.

The technical datasheets for 1H20 AR1/S, 1H20 AR1/D, 1H20 AR3/S  and 1H20 AR3/D water based acrylic conformal coatings are available on SCH’s website.

Click for further information on the water based acrylic conformal coatings.

Silicone Conformal Coatings – Humiseal Conformal Coating Materials

Humiseal have a range of silicone conformal coating materials that are UL and mil spec qualified for all areas of conformal coating application.

The silicone conformal coatings included in Humsiseal’s range include 100% solventless conformal coatings 1C49 and 1C49LV, moisture cure silicones (also known as RTVs – Room temperature vulcanisation) and 1C51, 1C53 and 1C55 heat cure conformal coatings.

The technical datasheets for 1C49, 1C49LV, 1C51, 1C53 and 1C55 silicone conformal coatings are available on SCH’s website.

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Masking Printed Circuit Boards for Conformal Coating

Masking Printed Circuit boards for a conformal coating process is a simple process once basics are understood. Using Humiseal Masking Materials for conformal coating processing ensures the most opportunity for success. Using silicone free masking tapes and dots, which do not cause conformal coating defects like de-wetting, and low ammoniated peelable latex, which does not corrosion of printed circuit boards, it is possible to mask successfully.

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Printed Circuit Boards and conformal coating processes

SCH have several conformal coating technical bulletins on conformal coating printed circuit boards (PCBs).  The reliability of printed circuit boards is increased by the application of conformal coating if applied correctly.

Click http://www.conformalcoating.co.uk/technicalbulletins.php for further information.

Surface Insulation Resistance Testing – The Long Term Reliability Test Method for Printed Circuit Boards (PCBs)

SCH offer the latest test methods in Surface Insulation Resistance (SIR) testing for measuring long term reliability of printed circuit boards (PCBs).

 

SIR testing can be used for materials characterisation, which has evolved into an accurate and quantitative method to predict circuit reliability and can be used to characterise the PCB assembly process. An example would be to use a test coupon under determined temperature and humidity to monitor adverse reactions through SIR results that would affect long term reliability.

SIR & Electromigration test methods include Bellcore GR-78-CORE and IPC-J-STD-004, plus the new IEC61189-5 process characterisation test using an assembled coupon.

SCH can provide coupon preparation, chamber time and final report or provide chamber time alone where the customer provides the coupons and analyses the output directly.

Ex-demo and reconditioned conformal coating equipment

SCH have ex-demo and reconditioned conformal coating equipment including a PVA spray conformal coating robot, conformal coating spray booth, conformal coating drying cabinet and a UV curing conveyor for cure of UV conformal coatings and other UV cure materials.