The document describes silicone material 1C63, which is a dual-cure silicone designed for electrical insulation applications. It has a viscosity of 3500 +/- 1500 cps, cures with UV irradiation of 1-5 J/cm2 followed by a secondary moisture cure, and provides protection up to 250 mils thick with good elongation, tensile strength, and high volume resistivity. It is a one-part material that applies and cures easily for both manual and automated processes.

2. Silicone
1C63
• A dual cure silicone material
specifically developed for electrical
insulation applications
• UL recognized, one part material,
designed for manual and automated
dispensing systems
• Fast processing and eliminates
shadow area concerns with secondary
moisture cure
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3. Silicone
1C63
• Designed to allow thick coating
applications of up to 250mils
(6.35mm)
• Engineered to cure to a clear
transparent finish for easy inspection
following processing
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4. Performance
1C63 •
•
Viscosity: 3500 +/- 1500 cps
Specific gravity: 8.42 lbs./gal (1.04)
• Cure conditions: UV Irradiation = 1-5 J/cm2
• Secondary Cure: 24hrs@RT or 20 min @76oC
• Elongation: 100 %
• Tensile : 100 psi
• CTE: 3 x 10-4/oC
• Shore Hardness: 15 A
• Volume resistivity: 7.97 x 1014 ohms.cm
• Flammability, per UL94: V1
• TI 105oC
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5. Processing
1C63 Application
• 1C63 viscosity is 3500 +/- 1500 cps
• Applies easily with standard equipment,
dipping, or brush.
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6. Processing
1C63 Cure
• 1C63 uses UV H bulb to cure.
Depending on thickness, 1-5 J/cm2 is
needed.
• 1C63 will not exotherm during cure
hence provides protection of any
sensitive components
• Any shadow areas will cure at room
temperature with ambient moisture
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7. Features
Benefits Feature Benefit
One part system Easy of Use
VOC Free No need for abatement equipment
Reduced running cost versus conventional SB
systems
Dual Cure UV and Moisture cure Systems Allow for rapid processing and automation
Reduced WIP due to ability to ET post cure
Designed for complex circuit designs
UL746E for indoor and outdoor applications Broad device appeal
Does not produce corrosive cure by-products Compatible with sensitive metals on the board
Better rounds out the available product
Possesses application diversity offering for users through high temperature
tolerance
Compatible with manual and automated
Easy to Implement
dispensing systems
Fluoresces under UV light Ease of Optical Inspection
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8. Conformal
Coating How To Select?
Applicable Standards & Specifications
– US MIL-I-46058C
– IPC-CC-830B
– UL - Underwriters Labs 746E
Electrical Properties
– Insulation resistance, dielectric constant
Thermal Properties
– Operating temperature range, thermal
expansion (CTE)
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9. Conformal
Coating Conformal Coating is a Simple Process
1. Clean
2. Masking
3. Coating Application
4. Dry / Cure
5. Remove Masking
Troubleshooting • But if product is not processed correctly…
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10. Conformal
Coating • Poor surface cleanliness is most common
cause of coating problems
– Adhesion loss
– Electrical failures
– Coating voids
• IPC specifications recommend ionic
cleanliness level of < 1.5 g/cm2 NaCl
equivalence
Troubleshooting
Surface Cleanliness
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11. Conformal
Coating • Need to keep within recommended ranges
• Too Thick
– Incomplete drying / solvent entrapment
– Bubbles
– Longer cure times
– Shrinking or cracking
– Decreased coating properties
• Too Thin
Troubleshooting – Inadequate Protection!
Coating Thickness
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