HumiSeal training

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HumiSeal training

  1. 1. Conformal Coating Training<br />
  2. 2. Conformal<br />Coating<br />What is a conformal coating?<br />What does it do?<br />Why coat?<br />What types are there?<br />How to select?<br />How to apply?<br />How to test?<br />
  3. 3. Conformal<br />Coating<br />What is a Conformal Coating?<br /><ul><li>A thin protective film that “conforms” to the varied profiles of an electronic circuit assembly.
  4. 4. A breathing membrane that will filter moisture and dirt to protect the assembly from environments.</li></li></ul><li>Conformal<br />Coating<br />Why Coat?<br />Provide Protection From:<br /><ul><li>Insulation and Dielectric Failures
  5. 5. Moisture
  6. 6. Heat
  7. 7. Corrosion
  8. 8. Fungus
  9. 9. Dust, Conductive particles</li></ul>IMPROVED CIRCUIT RELIABILITY<br />
  10. 10. Conformal<br />Coating<br />What Does It Do?<br />It should provide...<br /><ul><li>Good insulation
  11. 11. Good dielectric properties
  12. 12. Good moisture resistance
  13. 13. Good flexibility so as not to stress components...
  14. 14. Ability to be Repaired...</li></li></ul><li>Conformal<br />Coating<br />What Coating Types <br />Are Available?<br />
  15. 15. Conformal<br />Coating<br />How To Select?<br />Applicable Standards & Specifications<br /><ul><li>US MIL-I-46058C
  16. 16. IPC-CC-830B
  17. 17. UL - Underwriters Labs 746E</li></ul>Electrical Properties<br /><ul><li>Insulation resistance, dielectric constant</li></ul>Thermal Properties<br /><ul><li> Operating temperature range, thermal expansion (CTE)</li></li></ul><li>Conformal<br />Coating<br />Acrylic<br />Strengths<br />and<br />Weaknesses<br />
  18. 18. Conformal<br />Coating<br />Epoxy<br />Strengths<br />and<br />Weaknesses<br />
  19. 19. Conformal<br />Coating<br />Polyurethanes<br />Strengths<br />and<br />Weaknesses<br />
  20. 20. Conformal<br />Coating<br />Silicone<br />Strengths<br />and<br />Weaknesses<br />
  21. 21. Conformal<br />Coating<br />How To Apply?<br /><ul><li>Brushing
  22. 22. Dipping – Manual / Automated
  23. 23. Spraying – Aerosol / Manual / Automated
  24. 24. Flow-Coat – Automated</li></li></ul><li>Conformal<br />Coating<br />Brushing?<br /><ul><li>Best suited for repair and rework
  25. 25. Keep the brush “loaded”
  26. 26. Flow the coating - DO NOT PAINT!</li></ul>BRUSH<br />Application<br />
  27. 27. Conformal<br />Coating<br />Dip<br /><ul><li>Slow speed dip - < 30cm/min (12”/min)– Minimizes air entrapment under components
  28. 28. Slower Removal Rate - < 10cm/min (4”/min)– The slower the speed, the thinner the coating
  29. 29. ALWAYS dip board in vertical position, not horizontal</li></ul>DIP<br />Application<br />
  30. 30. Conformal<br />Coating<br />Dip<br /><ul><li>Coating penetrates under components and behind component legs
  31. 31. Coating is applied to both sides simultaneously
  32. 32. Coating thickness controlled by dipping speed & viscosity control
  33. 33. Can be done by hand for small assemblies but best done by machine</li></ul>DIP<br />Application<br />
  34. 34. Conformal<br />Coating<br />“Double Dipping”<br />DIP<br /><ul><li>Single Dip – Possibility of Sharp Edges being exposed
  35. 35. Double Dip Solves this Problem</li></ul>Application<br />
  36. 36. Conformal<br />Coating<br />Automated Dipping<br /><ul><li>Controls dip speed in and out
  37. 37. Maximizes coverage
  38. 38. Reduces waste
  39. 39. Minimizes Evaporation of Coating Bath</li></ul>DIP<br />Application<br />
  40. 40. Conformal<br />Coating<br />Spray?<br /><ul><li>Coating is thinned with solventfor application
  41. 41. Hand Spray
  42. 42. HumiSeal Aerosol products
  43. 43. Automated Equipment
  44. 44. Asymtek / Nordson
  45. 45. PVA</li></ul>SPRAY<br />Application<br />
  46. 46. Conformal<br />Coating<br />Spraying – Aerosol/Hand<br /><ul><li>Remember cured coating thickness should be 25 - 75(0.001-0.003”) and material is diluted
  47. 47. Need multiple passes each at 90 degrees and multiple coats, 2 to 3 minimum
  48. 48. Always spray assembly in horizontal with spray gun at ~45 degree angle to board surface</li></ul>SPRAY<br />Application<br />
  49. 49. Conformal<br />Coating<br />Spraying – Hand/Auto<br /><ul><li> Relatively Simple
  50. 50. 2-Part Materials may be used
  51. 51. Better Tip and Edge Coverage
  52. 52. Reduced Masking</li></ul>SPRAY<br />Application<br />
  53. 53. Conformal<br />Coating<br />AEROSOLS<br /><ul><li>1B73, 1B31, 1B73 EPA, 1A33and1A27
  54. 54. Packaged in 12-oz cans
  55. 55. Good for small users and rework
  56. 56. Lower solids content than liquid products</li></ul>SPRAY<br />Application<br />
  57. 57. Conformal<br />Coating<br />Selective Spray Equipment<br />SPRAY<br />Application<br />
  58. 58. Conformal<br />Coating<br />Automated Atomized Spray<br />SPRAY<br />Application<br />
  59. 59. Conformal<br />Coating<br />FLOW<br />Application<br />
  60. 60. Conformal<br />Coating<br />How To Test?<br /><ul><li>Visual Inspection With UV Light
  61. 61. Check Coating Uniformity</li></li></ul><li>Conformal<br />Coating<br />HumiSeal Conformal Coatings<br /><ul><li>Widest product selection
  62. 62. > 50 years experience
  63. 63. Greatest pool of technical knowledge
  64. 64. ISO 9001 Registered
  65. 65. Mil-I-46058C, IPC-CC-830 and UL746E compliant products
  66. 66. VOC compliant materials</li></li></ul><li>Conformal<br />Coating<br /><ul><li>EASY TO APPLY
  67. 67. Most forgiving of contamination
  68. 68. Dry at room temperatures
  69. 69. Have desirable electrical and physical properties
  70. 70. Fungus resistant
  71. 71. Long pot life
  72. 72. No exotherm during drying- heat sensitive components
  73. 73. Does not shrink
  74. 74. EASY TO REPAIR
  75. 75. VOC and VOC HAPS-free versions available</li></ul>HumiSealAcrylic (AR) Products<br />
  76. 76. Conformal<br />Coating<br /><ul><li>Excellent chemical and humidity resistance
  77. 77. Outstanding dielectric properties for extended periods
  78. 78. Excellent chemical resistance
  79. 79. Available as single - or two-component
  80. 80. Variety of cure types
  81. 81. Moderately repairable
  82. 82. Chemical strippers
  83. 83. Heat
  84. 84. VOC and VOC HAPS-free versions available</li></ul>HumiSealUrethane (UR) Products<br />
  85. 85. Conformal<br />Coating<br /><ul><li>Excellent for high temperature service
  86. 86. Good thermal endurance – heat generating devices
  87. 87. Humidity and corrosion resistance
  88. 88. One component, 100% solids – no VOC issues
  89. 89. Thermal or moisture cure
  90. 90. Lower abrasion resistance- softer
  91. 91. High CTE
  92. 92. Mechanically repairable
  93. 93. Not solvent-soluble / Do not vaporize with heat
  94. 94. New Silicone Digesters</li></ul>HumiSealSilicone (SR) Products<br />
  95. 95. Conformal<br />Coating<br /><ul><li>Two components: 2A53A + 2A53B
  96. 96. High abrasion and chemical resistance
  97. 97. Might be considered “indestructible”
  98. 98. Good electrical properties
  99. 99. Good component anchoring
  100. 100. Very Difficult to Repair
  101. 101. Hard to physically remove
  102. 102. Not removed by solvent
  103. 103. Chemical strippers will attack substrates</li></ul>HumiSealEpoxy (ER) 2A53<br />
  104. 104. Conformal<br />Coating<br /><ul><li>1B51 Series (Synthetic Rubber)
  105. 105. High flexibility
  106. 106. Excellent electrical properties
  107. 107. High humidity & corrosion resistance
  108. 108. Good thermal stability, low outgassing
  109. 109. High cohesive strength – tough
  110. 110. Low CTE
  111. 111. Stabile Modulus at lower temps
  112. 112. Must be repaired mechanically
  113. 113. Not solvent soluble / requires aggressive stripper
  114. 114. Does not vaporize with heat</li></ul>HumiSeal1B51 Series (Synthetic Rubber)<br />
  115. 115. Conformal<br />Coating<br /><ul><li>TempSeal
  116. 116. Strippers
  117. 117. Thinners</li></ul>HumiSealAncillary Products<br />
  118. 118. Conformal<br />Coating<br />Conformal Coating is a Simple Process<br />Clean<br />Masking<br />Coating Application<br />Dry / Cure<br />Remove Masking<br /><ul><li>But if product is not processed correctly…</li></ul>Troubleshooting<br />
  119. 119. Conformal<br />Coating<br /><ul><li>Poor surface cleanliness is most common cause of coating problems
  120. 120. Adhesion loss
  121. 121. Electrical failures
  122. 122. Coating voids
  123. 123. IPC specifications recommend ionic cleanliness level of < 1.5 g/cm2NaCl equivalence</li></ul>Troubleshooting<br />Surface Cleanliness<br />
  124. 124. Conformal<br />Coating<br /><ul><li>Need to keep within recommended ranges
  125. 125. Too Thick
  126. 126. Incomplete drying / solvent entrapment
  127. 127. Bubbles
  128. 128. Longer cure times
  129. 129. Shrinking or cracking
  130. 130. Decreased coating properties
  131. 131. Too Thin
  132. 132. Inadequate Protection!</li></ul>Troubleshooting<br />Coating Thickness<br />

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