Arcvolt BT 430 Module Housing and Busbar Insulating Coating
A two-component epoxy insulating coating applied at higher build to module housings, current-collector hardware, busbar supports and cold plates, where creepage and clearance distances are set by the pack design. It carries higher dielectric withstand and thicker film than BT 210 and adds resistance to coolant, electrolyte splash and repeated thermal cycling.
Grade Arcvolt BT 430 | Range Energy and Electronics Coatings | Technology Two-component epoxy, stoving or ambient cure
Technical Data Sheet
Arcvolt BT 430
Issue 2026.09
1. Product description
A two-component epoxy insulating coating applied at higher build for module housings, current-collector hardware, busbar supports and cold plates, where creepage and clearance distances are set by the pack design. It carries higher dielectric withstand and thicker film than BT 210 and adds resistance to coolant, electrolyte splash and repeated thermal cycling. An ambient-cure version is available for assemblies that cannot be baked once populated. It is an internal grade, so exposed external surfaces that see daylight need a topcoat over it.
2. Features
- Two-component epoxy applied at 60 to 150 microns dry
- Higher dielectric withstand than the cell-level BT 210 grade
- Resists coolant, electrolyte splash and repeated thermal cycling
- Stoving version, plus an ambient-cure version for assemblies that cannot be baked once populated
- Internal grade; exterior surfaces that see daylight need a topcoat
3. Recommended uses
Pack-level insulation of battery module housings, current-collector hardware, busbar supports and cold plates, where creepage and clearance distances are set by the pack design.
Substrates. Aluminium extrusion, die-cast aluminium, chromate-free pre-treated aluminium, cold-rolled and galvanised steel, copper busbar.
4. Typical properties
| Property | Typical value | Method |
|---|---|---|
| Technology | Two-component epoxy, stoving or ambient cure | Formulation |
| Components | Base and hardener, mixed before use | Not applicable |
| Dry film thickness | 60 to 150 microns, the published build for this high-build pack-level grade; the category's 15 to 50 micron insulating band applies to low-build cell grades such as BT 210 | ISO 2808 |
| Dielectric strength | 15 to 45 kV per mm depending on film build, stated at the measured minimum thickness | IEC 60243-1 |
| Surface resistivity | Above 1×10^13 ohms per square | ASTM D257 |
| Volume resistivity | Above 1×10^14 ohm cm | ASTM D257 |
| Adhesion, pull-off | 3 to 8 MPa depending on substrate and pre-treatment, with cohesive rather than adhesive failure preferred | ISO 4624 |
| Adhesion, cross-cut | Classification 0 to 1 on the specified pre-treatment | ISO 2409 |
| 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 |
| Coolant and electrolyte splash resistance | Resists coolant and electrolyte splash; exposure regime and pass criteria agreed for the project | 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 | Air-assisted airless or electrostatic spray |
| Surface preparation | Clean and degreased, with the pre-treatment specified for the substrate, for example a chromate-free pre-treatment on aluminium |
| Mixing | Mix base and hardener in the ratio stated on the label. Pot life of the mixed material is typically 1 to 4 hours at 25 degrees C and shortens as temperature rises. Mixed material past its pot life is discarded, not thinned and reused. |
| Applied film thickness | 60 to 150 microns dry, in two passes where build exceeds 100 microns |
| Cure schedule, stoving | 20 to 30 minutes at 120 to 150 degrees C metal temperature |
| Cure schedule, ambient-cure version | Handling strength in 4 to 8 hours, full property development within 7 days at 25 degrees C |
| Next step | Proof test dielectric withstand at the minimum measured film thickness once the film is fully cured: after stoving, or on the ambient-cure version once full properties have developed, which takes up to 7 days at 25 degrees C. Topcoat any exposed external surface that sees daylight. |
Process. Air-assisted airless or electrostatic spray at 60 to 150 microns dry, in two passes where build exceeds 100 microns. Stove 20 to 30 minutes at 120 to 150 degrees C metal temperature, or ambient cure with handling strength in 4 to 8 hours and full property development in 7 days at 25 degrees C. Pot life after mixing is stated on the data sheet and is temperature dependent.
6. Storage and handling
Store both components in their original closed containers in a cool, dry, covered area, away from direct sunlight and sources of heat. 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.