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Momentive Silicone Conformal Coating Overview

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Momentive has launched two new products, ECC3011 and ECC3051S conformal coatings that can withstand harsh operating conditions, helping to prevent the occurrence of corrosion on vital PCB components and surfaces.

Published in: Devices & Hardware
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Momentive Silicone Conformal Coating Overview

  1. 1. Silicone Conformal Coating Introduction
  2. 2. Conformal Coating Overview Conformal coatings are materials applied in thin layers (typically a few mils or a fraction of a mm) onto printed circuits or other electronic substrates. They provide environmental and mechanical protection to help significantly extend the life of the components and circuitry. Conformal coatings are traditionally applied by dipping, spraying or simple flow coating, and increasingly by select coating or robotic dispensing. Conformal coatings protect electronic printed circuit boards (PCB) from moisture and contaminants, help to prevent short circuits and corrosion of conductors and solder joints. They also minimize movement of ions in a conductor (Electro-Migration). In addition, the use of conformal coatings protects circuits and components from abrasion and solvents. Stress relief is also provided, as well as protection of the insulation resistance of the circuit board. A coating surface also helps insulate conduction paths between components by helping to block humidity (insulation resistance) Momentive conformal coating under black light. Copyright © 2017 Momentive Performance Materials Inc. All rights reserved.
  3. 3. Momentive Conformal Coating Product Typical Physical Properties Legacy Grades Corrosion Resistance Improvement Grades Heat Cure Room Temperature Cure Room Temperature Cure ECC4685 ECC3010 ECC3050S ECC3011 ECC3051S Polymer Type Silicone Rubber Silicone Rubber Silicone Rubber Silicone Rubber Silicone Rubber Components 1 Part 1 Part 1 Part 1 Part 1 Part Color Clear Clear Clear Clear Clear Viscosity (Pas) 0.25 0.11 0.55 0.11 0.55 Solid Content 100% 100% 100% 100% 100% Solvents None None None None None Specific Gravity 0.98 0.99 0.98 0.99 0.98 Tack Free Time at 23ᵒC (min) - 3 (at100um) 5 (at100um) 3 (at100um) 5 (at100um) Cure Time (min) 15 (at105ᵒC) 10 (at 23ᵒC) 30 (at 23ᵒC) 10 (at 23ᵒC) 30 (at 23ᵒC) Hardness (Type A) 35 (shore A) 35 22 35 22 Dielectric Strength (KV/mm) 20 20 20 20 20 Volume Resistivity (MΩ.m) 5.0 x 106 1.0 x 107 1.0 x 107 1.0 x 107 1.0 x 107 Salt Spray Result* - - - Good Good Mixed Gas Test Result** - - - Good Good IPC –CC-830B Status - - - Good Good *IEC60068-2-52 Severity 5 **IEC60068-2-60 Method 4 New ECC3011 & ECC3051S are new grades that utilize a proprietary technology to further help Momentive material to prevent the occurrence of PCB corrosion under harsh operating conditions. Copyright © 2017 Momentive Performance Materials Inc. All rights reserved. Typical properties are average data and are not to be used as or to develop specifications.
  4. 4. Conformal Coating Comparison Momentive Products: Manufactured to be solvent-free and fast cure with no curing process & equipment Copyright © 2017 Momentive Performance Materials Inc. All rights reserved. Typical properties are average data and are not to be used as or to develop specifications. Physical Properties Comparison Table Product A Product B Product C Product D ECC3011 ECC3051S Maker Competitor A Competitor A Competitor A Competitor B Momentive Momentive Parts 1-Component 1-Component 1-Component 1-Component 1-Component 1-Component Polymer Polyurethane Polyolefin Acrylic Silicone Silicone Silicone Color Clear Clear Clear Clear Clear Clear Viscosity (Pas) 0,18 0,185 0,025 0,75 0,11 0,55 Solid Content 44% 22% 15% 72% 100% 100% Solvents Toluene, Butanone Cyclohexane Butyl Acetate Toluene Solvent Free Solvent Free Solvent Content 56% 78% 85% 28% 0% 0% Tack Free Time at 23 ᵒ C (min) 15 (at 75um) 10 (at 75um) 30 (at 75um) 7 (at 100um) 3 (at 100um) 5 (at 100um) Tack Free Time at 60 ᵒ C, 15% (min) - - - 2 (at 100um) 1 (at 100um) 2 (at 100um) Cure Time (at 23 ᵒ C) 720 Hours (30 Days) 24 Hours 24 Hours 10 min 30 min. Hardness  (Type A) - - - 80 35 22 Dielectric Strength (KV/mm) - - - 16 20 20 Volume Resistivity (Mohm.m) 2.0 x 106 2.0 x 106 5.5 x 106 5.0 x 105 1.0 x 107 1.0 x 107
  5. 5. Momentive Solvent-Free Formulation Momentive Conformal Coatings are manufactured to be 100% solid content (solvent-free) Unlike many available conformal coating materials that are highly solvent borne, Momentive employs a solvent-free design in its products. This not only eliminates harsh solvents from the product, but allows Momentive´s coating to be easily applied in one pass to achieve a thickness of >50um, which helps to ensure that an adequate protective layer remains on the PCB. PCB 100um PCB PCB 50um PCB 100um PCB 100um Solvent Type (non-Momentive) Solvent-Free Type (Momentive) applied thickness solvent escape thickness (after) applied thickness thickness (after cure) Copyright © 2017 Momentive Performance Materials Inc. All rights reserved.
  6. 6. Coating Material Considerations 1) Polymer Gas Permeability: In addition to Silicone, there are several polymer options for Conformal Coating materials including Polyurethane, Acrylics, and Polyolefin. Silicones are known to be more gas permeable than other polymers, and this leads to a common misperception that silicones are less effective in protecting PCBs. Gas Permeability is just one of several factors that must be considered. When other properties (adhesion, stress-relief, temperature resistance) are taken into account, Silicones stand out as an ideal conformal coating material for protecting PCBs. Polymer 0.5mm Thickness 1mm Thickness Silicone (rubber) 215 117 Silicone (resin) 104 55 Polyolefin 6 3 Acrylic 36 30 Polyurethane 32 18 Conformal Coating Failure Mode: The most common form of PCB failure results from ingress of moisture and contaminants to the delicate components on the PCB. Moisture accelerates electro-migration between conductors, leading to failure. It is important to note that corrosion and migration occur when moisture is allowed to accumulate on the board surface. Although moisture may reach the board, if there is no gap or void where moisture can accumulate, corrosion can be prevented. Copyright © 2017 Momentive Performance Materials Inc. All rights reserved.
  7. 7. Coating Material Considerations 2) Adhesion: The presence of cavities where the Conformal Coating has separated (delaminated) or cracked will create the potential for moisture accumulation and, eventually, corrosion. It is very important that the Conformal Coating exhibits good adhesion to the PCB. Regardless of the gas permeability of the polymer used or thickness at which the Conformal Coating material is applied, good adhesion is required to help prevent moisture accumulation. 3) Stress-Relief: Momentive’s Silicone Conformal Coating materials are elastomeric, which not only provide stress relief to PCB components, but also allow the coating material to absorb mechanical and thermal stress that occurs when the PCB undergoes high-to-low temperature cycles, thereby allowing the conformal coating material to maintain a strong adhesive bond to the substrate. Rigid Conformal Coatings (polyurethane acrylics, polyolefin and resin type silicones) can not only apply stress to components, but also experience delamination or cracking due to their inability to absorb thermal cycling stress. 4) Heat Resistance: Silicone Conformal Coating materials typically can be used in operating conditions ranging from -45 ~ 200C with limited change in properties. Unlike other polymer types, Silicone Conformal Coating resists hardening and/or cracking, and is able to maintain properties needed to provide the required level of adhesion and protection. Coating material delamination Copyright © 2017 Momentive Performance Materials Inc. All rights reserved.
  8. 8. SALT SPRAY TEST IEC60068-2-52 SEVERITY 5 Copyright © 2017 Momentive Performance Materials Inc. All rights reserved.
  9. 9. Test Standard: IEC60068-2-52 Severity 5 Test Parameters: - Salt Spray Cycle: [(Salt Spray at 35 °C x 2 hours) + (40 °C, 95% RH x 22 hours)] x 4 cycles (96 hours total) - Conditioning Cycle: After each Salt Spray Cycle, dwell at 23 °C, 50% RH x 72 hours (168 hours total) - Cycle Repetition: Repeat above process 4 times (672 hours, 28 days) Test Samples: Comb Pattern Boards Evaluation Criteria: - Visual confirmation of corrosion Copyright © 2017 Momentive Performance Materials Inc. All rights reserved. Conformal Coating Salt Spray Test Note: Test results. Actual results may vary.
  10. 10. Note: Test results. Actual results may vary. Copyright © 2017 Momentive Performance Materials Inc. All rights reserved. Conformal Coating Salt Spray Test G Good. No corrosion C Early stages of corrosion F Fail. Excessive corrosion Momentive ECC3011 Initial 28 Days Result Momentive ECC3051S Initial 28 Days Result G G
  11. 11. Note: Test results. Actual results may vary. Copyright © 2017 Momentive Performance Materials Inc. All rights reserved. Conformal Coating Salt Spray Test G Good. No corrosion C Early stages of corrosion F Fail. Excessive corrosion Competitor Silicone Resin Initial 28 Days Result F Competitor Polyurethane Initial 28 Days Result F
  12. 12. Note: Test results. Actual results may vary. Copyright © 2017 Momentive Performance Materials Inc. All rights reserved. Conformal Coating Salt Spray Test G Good. No corrosion C Early stages of corrosion F Fail. Excessive corrosion Competitor Polyolefin Initial 28 Days Result C Competitor Acrylic Initial 28 Days Result F
  13. 13. Summary Momentive ECC3011: GOOD Momentive ECC3051S: GOOD Competitor Silicone Resin Type: FAIL Polyurethane: FAIL Polyolefin: EARLY STAGES OF FAILURE Acrylic: FAIL Observations: - The benefit of anti-corrosion formulation for Momentive ECC series was confirmed - Highly Solvent Borne competitor grades (silicone & non-silicone) consistently failed. - The failure of competitor grades was associated with poor PCB surface adhesion. - Gas permeability of the polymer appeared to be less an issue than thickness & adhesion. Copyright © 2017 Momentive Performance Materials Inc. All rights reserved. Conformal Coating Salt Spray Test Note: Test results. Actual results may vary.
  14. 14. MIXED NOXIOUS GAS CORROSION (4 GASES) IEC60068-2-60 METHOD 4 Copyright © 2017 Momentive Performance Materials Inc. All rights reserved.
  15. 15. Test Standard: IEC60068-2-60 Method 4 Test Parameters: - Place Coated Comb Pattern Boards in Gas Chamber According to Test Conditions - Remove after 21 days. - Visual Inspection to Initial…confirm presence of corrosion - Measure Surface Resistance (initial & 21 days) Test Samples: Comb Pattern Boards Copyright © 2017 Momentive Performance Materials Inc. All rights reserved. Mixed Noxious Gas Corrosion Test Gas Chamber Coating Materials Tested • Polyolefin • Polyurethane • Acrylic • Competitor Silicone Resin Type • Momentive ECC3011 • Momentive ECC3051S IEC60068-2-60 Method 4 Concentration (ppm) H2S Hydrogen Sulfide 10 ±5 NO2 Nitrogen Dioxide 200 ±20 Cl2 Chlorine 10 ±20 SO2 Sulfur Dioxide 200 ±20 Temperature (℃) 25 ±1 Humidity RH% 75 ±3
  16. 16. Note: Test results. Actual results may vary. Copyright © 2017 Momentive Performance Materials Inc. All rights reserved. Mixed Noxious Gas Corrosion Test G Good. No corrosion C Early stages of corrosion F Fail. Excessive corrosion Momentive ECC3011 Initial 21 Days Result G Momentive ECC3051S Initial 21 Days Result G
  17. 17. Note: Test results. Actual results may vary. Copyright © 2017 Momentive Performance Materials Inc. All rights reserved. Mixed Noxious Gas Corrosion Test G Good. No corrosion C Early stages of corrosion F Fail. Excessive corrosion Competitor Silicone Resin Initial 21 Days Result C Competitor Polyurethane Initial 21 Days Result C
  18. 18. Note: Test results. Actual results may vary. Copyright © 2017 Momentive Performance Materials Inc. All rights reserved. Mixed Noxious Gas Corrosion Test G Good. No corrosion C Early stages of corrosion F Fail. Excessive corrosion Competitor Polyolefin Initial 21 Days Result C Competitor Acrylic Initial 21 Days Result C
  19. 19. Summary Momentive ECC3011: GOOD Momentive ECC3051S: GOOD Competitor Silicone Resin Type: EARLY STAGES OF FAILURE Polyurethane: EARLY STAGES OF FAILURE Polyolefin: EARLY STAGES OF FAILURE Acrylic: EARLY STAGES OF FAILURE Copyright © 2017 Momentive Performance Materials Inc. All rights reserved. Mixed Noxious Gas Corrosion Test Note: Test results. Actual results may vary.
  20. 20. Grade Salt Spray Mixed Gas Overall ECC3011 (MPM silicone) ● ECC3051S (MPM silicone) ● Competitor Silicone Resin ● Polyurethane ● Polyolefin ● Acrylic ● Copyright © 2017 Momentive Performance Materials Inc. All rights reserved. Note: Test results. Actual results may vary. G Good. No corrosion C Early stages of corrosion F Fail. Excessive corrosion Final Assessment G G G G G G F F F F F F C C C C C C
  21. 21. RELIABILITY TESTING IPC-CC-830B / MIL-I-46058C Copyright © 2017 Momentive Performance Materials Inc. All rights reserved.
  22. 22. IPC Standard Tests: • Appearance Completed • Flourescence Completed • Thickness Completed • Flexibility Completed • Dielectric Withstanding Voltage Completed • Moisture and Insulation Resistance Completed • Thermal Shock Completed • Temperature and Humidity Aging Completed Copyright © 2017 Momentive Performance Materials Inc. All rights reserved. IPC-CC-830B / MIL-I-46058C
  23. 23. Dielectric Withstanding Voltage Test Parameters: - Raise test voltage from zero to 1,500 VAC at 100 VAC per second. Apply the test voltage of 1,500 VAC at 50-60Hz for one minute and record any leakage rate - No evidence of disruptive discharge by flashover, spark-over, or breakdown. - The leakage rate shall not exceed 10 micro- amperes. Test Samples: PCB per MIL-I-46058C Note: Test results. Actual results may vary. Copyright © 2017 Momentive Performance Materials Inc. All rights reserved. IPC-CC-830B / MIL-I-46058C Conformal Coating Grade Leakage Rate (μA) ECC3011 4.6 ECC3051S 4.4 Flexibility Test Parameters: - Place a 0.3 cm mandrel in the center of the coated panel. Bend one side 180o over the mandrel. - Inspect for cracking ECC3011 ECC3051S
  24. 24. Test Parameters: - Apply a 50 VDC polarizing bias to test patterns. - Expose test specimens to 20 cycles of temperature and humidity. - Humidity shall be maintained at 85% minimum - One cycle is as follows: - Start test at 25℃ and raise the temperature to 65℃ over a time span of 1.75 hours. - Maintain temperature at 65℃ for 3 hours - Lower the temperature from 65℃ to 25℃ over 1.75 hours - At Cycle 1, 4, 7 and 10, apply 100 VDC on the specimen’s test points with the resistance meter without opening the chamber. - On the 20th cycle, maintain 25℃ relative humidity of 50% for 24 hours and measure insulation resistance. - Pass Condition: Insulation resistance shall be > 500 MΩ during humidity and after 24 hours at reference conditions Test Samples: IPC-B-25A coupon Note: Test results. Actual results may vary. Copyright © 2017 Momentive Performance Materials Inc. All rights reserved. . IPC-CC-830B / MIL-I-46058C Conformal Coating Grade Unit Initial 1 Cycle 4 Cycles 7 Cycles 10 Cycles 20 Cycles (& 24H dwell) ECC3011 MΩ 2,500,000 117,525 151,299 86,558 121,307 2,125,000 ECC3051S MΩ 2,500,000 55,537 39,319 30,921 42,411 2,500,000
  25. 25. Note: Test results. Actual results may vary. Copyright © 2017 Momentive Performance Materials Inc. All rights reserved. IPC-CC-830B / MIL-I-46058C Test Parameters: - Thermal Shock settings -65 °C ~ 125 °C, dwell time 15 minutes - Repeat for 100 cycles - After 100 cycles, maintain at 25°C RH 50% for 24 hours prior to measurement. - No evidence of disruptive discharge by flashover, spark-over, or breakdown. - The leakage rate shall not exceed 10 microamperes. Test Samples: PCB per MIL-I-46058C Conformal Coating Grade Leakage Rate (μA) ECC3011 4 ECC3051S 4 Thermal Shock
  26. 26. Note: Test results. Actual results may vary. Copyright © 2017 Momentive Performance Materials Inc. All rights reserved. IPC-CC-830B / MIL-I-46058C Test Parameters: - Place specimens in a 85°±2°C and 95 ± 4% relative humidity chamber - Test up to 120 days and observe specimens at the 28th, 56th, 84th and 120th intervals - Pass Condition: Evaluate the specimens for evidence of reversion as indicated by softening, chalking, blistering, cracking, tackiness, loss of adhesion or liquefaction. Evaluate also legibility of the markings on the board and/or the resistors. Test Samples: IPC “Y” Test Coupon Temperature and Humidity Aging
  27. 27. Current Packaging: 1 kg Can & Pail Copyright © 2017 Momentive Performance Materials Inc. All rights reserved.
  28. 28. Current Packaging: Bladder Pack This package consists of a LLDPE Bladder Pack which contains the ECC material, and a pail can into which the full Bladder is placed. Bladder Packs are placed in pressure tanks to force out material to spray booth. Empty Bladder Pack Full Bladder Inside Pails Adaptor Copyright © 2017 Momentive Performance Materials Inc. All rights reserved.
  29. 29. DISCLAIMER: THE MATERIALS, PRODUCTS AND SERVICES OF MOMENTIVE PERFORMANCE MATERIALS INC. AND ITS SUBSIDIARIES AND AFFILIATES DOING BUSINESS IN LOCAL JURISDICTIONS (COLLECTIVELY “SUPPLIERS”) ARE SOLD BY THE RESPECTIVE LEGAL ENTITY OF THE SUPPLIER SUBJECT TO SUPPLIERS’ STANDARD CONDITIONS OF SALE, WHICH ARE INCLUDED IN THE APPLICABLE DISTRIBUTOR OR OTHER SALES AGREEMENT, PRINTED ON THE BACK OF ORDER ACKNOWLEDGMENTS AND INVOICES, AND AVAILABLE UPON REQUEST. ALTHOUGH ANY INFORMATION, RECOMMENDATIONS, OR ADVICE CONTAINED HEREIN IS GIVEN IN GOOD FAITH, SUPPLIERS MAKE NO WARRANTY OR GUARANTEE, EXPRESS OR IMPLIED, (I) THAT THE RESULTS DESCRIBED HEREIN WILL BE OBTAINED UNDER END-USE CONDITIONS, OR (II) AS TO THE EFFECTIVENESS OR SAFETY OF ANY DESIGN INCORPORATING SUPPLIERS’ PRODUCTS, MATERIALS, SERVICES, RECOMMENDATIONS OR ADVICE. AFOREMENTIONED EXCLUSIONS OR LIMITATION OF LIABILITY ARE NOT APPLICABLE TO THE EXTENT THAT THE END-USE CONDITIONS AND/OR INCORPORATION CONDITIONS CORRESPOND TO THE RECOMMENDED CONDITIONS OF USE AND/OR OF INCORPORATION AS DESCRIBED BY SUPPLIER IN ITS PRODUCT DATA SHEET AND/OR PRODUCT SPECIFICATIONS. EXCEPT AS PROVIDED IN SUPPLIERS’ STANDARD CONDITIONS OF SALE, SUPPLIERS AND THEIR REPRESENTATIVES SHALL IN NO EVENT BE RESPONSIBLE FOR ANY LOSS RESULTING FROM ANY USE OF ITS MATERIALS, PRODUCTS OR SERVICES DESCRIBED HEREIN. Each user bears full responsibility for making its own determination as to the suitability of Suppliers’ materials, services, recommendations, or advice for its own particular use. Each user must identify and perform all tests and analyses necessary to assure that its finished parts incorporating Suppliers’ products, materials, or services will be safe and suitable for use under end-use conditions. Nothing in this or any other document, nor any oral recommendation or advice, shall be deemed to alter, vary, supersede, or waive any provision of Suppliers’ Standard Conditions of Sale or this Disclaimer, unless any such modification is specifically agreed to in a writing signed by Suppliers. No statement contained herein concerning a possible or suggested use of any material, product, service or design is intended, or should be construed, to grant any license under any patent or other intellectual property right of Suppliers or any of its subsidiaries or affiliates covering such use or design, or as a recommendation for the use of such material, product, service or design in the infringement of any patent or other intellectual property right. Momentive and the Momentive logo are trademarks of Momentive Performance Materials Inc. Copyright © 2017 Momentive Performance Materials Inc. All rights reserved. More information available at www.momentive.com/conformalcoatings/

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