How do you know the safe exposure limit of a degreaser, contact cleaner, or flux remover?
The personal hazard associated with a solvent is often defined using Threshold Limit Value (TLV), which is the recommended average exposure in an 8-hour day, 40 hour work week. The lower the TLV of a particular substance, the less a worker can...
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Tutorial: Keeping Safe When Using Industrial Solvents
I’m going to discuss toxicity issues with some classes of solvent cleaners, and how you can make the best decisions to keep your workers safe and healthy. There is increased interest in this topic because of the EPA’s recent statement...
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What is the difference between dielectric strength and dielectric withstand voltage?
The dielectric strength is material intrinsic property and withstand voltage is surface property which depend on thickness of the material. They can be slightly different for thicker materials, but for conformal coating, the two numbers should...
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What type of UV light / black light should I use for QC inspection of the final conformal coating?
Conformal coating with UV tracer can be inspected with any typical UV lamp which has wavelength of 320-380 nm.
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Screen Printing Chemtronics Temporary Solder Masks
Chemtronics Chemask temporary spot solder masks are usually applied by hand in benchtop masking operations. For large scale production operations, Chemask WF Water-Filterable Mask (part #CWF8) can be screen printed over large areas of the circuit...
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Is there a pen available to repair PCB markings or cover components for security reasons?
Black (CW3300BLACK) and White (CW3300WHITE) are also available to repair PCB markings or cover component identification for security or IP protection.
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How do I repair solder resist when the specific color isn’t available?
CircuitWorks Clear Overcoat Pen (part #CW3300C) is available to patch areas on more unusually colored resist coating (e.g. brown, purple, etc.).
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Can CircuitWorks Epoxy Overcoat withstand soldering temperature?
Yes. When soldering is required after the repair has been done, Chemtronics offers CircuitWorks Epoxy Overcoat (CW2500). It is a permanent green coating formulated to protect circuit traces before being exposed to reflow conditions. Epoxy Overcoat...
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Can CircuitWorks Overcoat Pens withstand soldering temperatures?
No. CircuitWorks Overcoat Pens should be the final step in processing the board. The Overcoat material is a modified acrylic conformal coating not an epoxy resist material, so it does not have the same properties of durability and permanence...
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Solder Resist Repairs Using CircuitWorks Overcoat Pen and Epoxy
Board manufacturers, wishing to improve the appearance of the boards, need a material that can easily repair any chips or scratches in the permanent resist coating, improving the appearance of the finished board. Chemtronics offers two solutions:...
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