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ESD, Conathane VS Humiseal Conformal coating on PCB

Discussion in 'General Electronics Chat' started by Billy Mayo, Dec 20, 2013.

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  1. Billy Mayo

    Billy Mayo Member

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    Does using Conathane protects components and the pcb board from ESD?
    Does using Humiseal conformal coating protects components and the pcb board from ESD?

    If a Technician or other puts their hands all over the PCB board that has Conathane or Humiseal conformal coating is this protected from ESD?

    Does laying a PCB board on a ESD mate protect it from ESD if a technician touches the IC chips? or does the PCB board need to be grounded with a jump wire from the circuit boards ground to the ESD mate?

    What removes Conathane from a PCB?

    They have Humiseal thinner to remove conformal coating , but what about Conathane?

    Does wearing a ESD wrist strap really do anything when touching TTL and CMOS IC Chips?
     
  2. Billy Mayo

    Billy Mayo Member

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    How do u turn a normal soldering iron into an ESD soldering station?

    Do I need to wear ESD gloves, because i'm touching the solder, can't this cause static?

    My Manager said I can use Acetone to remove conathane and humiseal comformal coating

    Can I use Acetone? will this damage the pcb board and components?
     
  3. jpanhalt

    jpanhalt Well-Known Member Most Helpful Member

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    Conathane is a brand name. Apparently it can be a filled polyurethane, an unfilled hard polyurethane, or an epoxy. I did not bother checking on Humiseal. If you want answers about specific substances, please:
    1) Don't just give a brand name that could apply to several different products. Be specific.
    2) Give a link to the product description
    3) Give a link to the product's technical data sheet
    4) Give a link to the product's MSDS

    It is conceivable that one or both products can dissipate static, but we don't know, as you didn't give enough information to find out. How protective that coating would be is something the manufacturer would have to document. However, if there is a spark from your hand to the PCB, it seems unlikely the coating will be very protective.

    Acetone is a fairly aggressive solvent. It can dissolve some coatings, e.g., lacquers, and it can denature other coatings and make them easily scraped off, e.g., many enamel paints. Most polyurethanes and epoxies will be fairly resistant to it. In fact, as a general rule, such polymers are quite resistant to all solvents after they polymerize (i.e., get hard). Those solvents that do affect such polymers do so by denaturing them, rather than dissolving them.

    As for components on your board, acetone may affect polystyrene and acrylic types of plastics, but nylon, epoxy, acetal, and polypropylene are generally resistant. Teflon and related plastics are resistant. Acetone may affect the labels on some components. I would be very careful using acetone around any optical component, such as an IR emitter or detector. You fail to tell us what the pcb you are using is made of. Teflon is resistant to acetone. Epoxy, as already stated, is also fairly resistant. One thing to be careful of is the longterm effect of acetone on some plastics. There may be no immediate effect, but months after exposure the plastic may start to crack and craze. Every plastics manufacturer will have a chart of chemical resistance, and acetone is usually shown on those charts.

    John
     
  4. dave

    Dave New Member

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  5. Billy Mayo

    Billy Mayo Member

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    Why can't the coating protect it from a spark or ESD?

    What's the point of having this protective coating than?

    So How do I unsolder IC chips and lift them off when they have filled polyurethane on them? or hard polyurethan, or an epoxy?
     
  6. jpanhalt

    jpanhalt Well-Known Member Most Helpful Member

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    Please provide the information I asked of you. Are these questions so you can help your "manager" understand, are they questions of an alternative persona, or are they your questions? I get tired quickly of playing games.

    Without knowing what products you are asking about, it is impossible to answer your questions.

    John
     
  7. Billy Mayo

    Billy Mayo Member

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    I already told u the product names Conathane and Humiseal
     
  8. jpanhalt

    jpanhalt Well-Known Member Most Helpful Member

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    Conathane is not a single product. Did you read post #3?

    Good luck.

    John
     
  9. 4pyros

    4pyros Well-Known Member Most Helpful Member

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    Remove the coating and use solder wick.
     
  10. Billy Mayo

    Billy Mayo Member

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    How do I remove the coating? with what?
     
  11. Billy Mayo

    Billy Mayo Member

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    Protective Coatings
    1.) Hysol PC18 or PC29M
    2.) Conathane 1155 per Mil-L-46058 by Conap
     
  12. jpanhalt

    jpanhalt Well-Known Member Most Helpful Member

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    Is this a game? You never mentioned Hysol before. That particular Hysol/Henkel product (https://tds.us.henkel.com//NA/UT/HN...405BE75C38882571870000DA99/$File/PC18M-EN.pdf) is a moisture-cured polyurethane. Curing is facilitated by heat. It is noted for its resistance to solvents. Like many polyurethanes, it breaks down at moderately high temperature and can be soldered through.
    upload_2013-12-26_19-42-23.png
    After repair, you will need to re-coat to attain the same level of environmental protection you had before, but that may not be necessary for areas you anticipate re-repairing in a few weeks or so.

    Apparently , HumiSeal and Hysol are often carried by the same distributor. Do you know which product you are actually using? Does it have label?

    John
     
  13. Billy Mayo

    Billy Mayo Member

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    No I don't sorry, but it's already SPRAYED on the pcb boards with components on it

    This is all what the manual tells me
     
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