Arcvolt CF 430 Silicone Conformal Coating
A moisture-cure silicone conformal coating applied at higher build for assemblies that run hot, cycle widely or sit in condensing humidity. It stays flexible from low temperature to around 200 degrees C and relieves stress on tall components, wire bonds and leaded joints during thermal cycling.
Grade Arcvolt CF 430 | Range Energy and Electronics Coatings | Technology Moisture-cure silicone
Technical Data Sheet
Arcvolt CF 430
Issue 2026.09
1. Product description
A moisture-cure silicone conformal coating at higher build for assemblies that run hot, cycle widely or sit in condensing humidity. It stays flexible from low temperature to around 200 degrees C and relieves stress on tall components, wire bonds and leaded joints during thermal cycling. Rework is harder than with the acrylic grade, so it is specified where service life in a hostile environment outweighs repairability.
2. Features
- Moisture-cure silicone applied at 50 to 200 microns dry
- Stays flexible from low temperature to around 200 degrees C
- Relieves stress on tall components, wire bonds and leaded joints during thermal cycling
- Intended for hot running, wide cycling and condensing humidity
- Rework is harder than with the acrylic grade CF 210
3. Recommended uses
Power and motor-drive assemblies, LED boards, ceramic and insulated metal substrates and partly encapsulated subassemblies, where service life in a hostile environment outweighs repairability.
Substrates. Power and motor-drive assemblies, ceramic and insulated metal substrates, LED boards, potted and partly encapsulated subassemblies.
4. Typical properties
| Property | Typical value | Method |
|---|---|---|
| Technology | Moisture-cure silicone | Formulation |
| Cure mechanism | Reaction with atmospheric moisture; depth of cure depends on water vapour reaching the film | Not applicable |
| Dry film thickness | 50 to 200 microns, measured on a witness coupon coated with the assembly or over flat metal areas | ISO 2808 |
| Flexibility range | Flexible from low temperature up to around 200 degrees C | Customer or supplier protocol |
| Dielectric strength | 15 to 45 kV per mm depending on film build, stated at the measured minimum thickness | IEC 60243-1 |
| Volume resistivity | Above 1×10^14 ohm cm | ASTM D257 |
| Thermal cycling | 200 to 1000 cycles between minus 40 and plus 85 degrees C with no cracking, delamination or loss of insulation resistance | IEC 60068-2-14 |
| Damp heat, steady state | 1000 to 2000 h at 85 degrees C and 85 per cent relative humidity, with pass criteria agreed for the project | IEC 60068-2-78 |
| Cure window | Tack free in 20 to 40 minutes, full cure in 24 to 72 hours at 25 degrees C and 50 per cent relative humidity | Customer or supplier protocol |
Typical values, not a specification. Values for each batch are given on its Certificate of Analysis.
5. Application
| Parameter | Guidance |
|---|---|
| Application method | Selective dispense, spray or dip |
| Surface preparation | Assembly clean and dry, with connectors, test points and other keep-out areas masked |
| Applied film thickness | 50 to 200 microns dry, checked on a witness coupon coated with the assembly |
| Ambient cure | Tack free in 20 to 40 minutes, full cure in 24 to 72 hours at 25 degrees C and 50 per cent relative humidity |
| Heat-assisted handling | 30 to 60 minutes at 80 degrees C brings the surface to handling strength. A dry oven does not shorten the full cure, because depth of cure depends on water vapour reaching the film. |
| Proof testing | Follows the ambient full-cure schedule, not the heat-assisted handling time |
| Rework | Harder than with the acrylic grade; specify where service life in a hostile environment outweighs repairability |
Process. Selective dispense, spray or dip at 50 to 200 microns dry. Moisture cure at ambient, tack free in 20 to 40 minutes and full cure in 24 to 72 hours at 25 degrees C and 50 per cent relative humidity. Heat brings the surface to handling strength in 30 to 60 minutes at 80 degrees C, but depth of cure still depends on water vapour reaching the film, so a dry oven does not shorten the full cure and proof testing follows the ambient schedule.
6. Storage and handling
Keep in the original tightly closed containers in a cool, dry, covered area and reseal part-used containers promptly, because the product cures on contact with moisture. Shelf life is stated on the label and Certificate of Analysis. Handle and use the product in line with its Safety Data Sheet.
7. Safety and regulatory information
Read the Safety Data Sheet before use. Safety Data Sheets and regulatory declarations are issued by our technical centre against the product and batch supplied, so they are sent on request rather than published. Request a Safety Data Sheet or declaration.
This Technical Data Sheet is published for on-screen reference. The information is given in good faith from laboratory and application experience and describes typical values; it is not a specification and does not replace a trial on your own substrate and line. Arctic Materials may revise this sheet without notice. Issue 2026.09.
Technical Data Sheets on this site are for on-screen viewing. For a controlled copy, write to tech@arcticmaterials.com.
Other grades in this range
Need a Safety Data Sheet, a regulatory declaration or a grade specified to your line? Contact our technical centre.