Arcdip CE 340 High Throw High Build Cathodic Epoxy Electrocoat Primer
Arcdip CE 340 is a cathodic epoxy electrocoat primer formulated to drive deposition further into box sections, blind areas and weld seams, and to finish at a higher build on the open surface than CE 220. Film thickness still falls with distance into a cavity, so the geometry of the part sets the limit of interior coverage.
Grade Arcdip CE 340 | Range Electrocoat | Technology Waterborne cathodic epoxy electrocoat, acid-solubilised resin emulsion with pigment paste, high throw formulation
Technical Data Sheet
Arcdip CE 340
Issue 2026.09
1. Product description
A cathodic epoxy formulated so that current continues to drive deposition further into box sections, blind areas and weld seams after the outer surfaces are coated, and so that the open surface finishes at a higher build than CE 220. Throw is finite and directional: film thickness still falls with distance into a cavity, so an interior surface finishes thinner than the outside and the geometry, not the coating, sets the limit. Specified for welded and folded assemblies where the interior of the fabrication has to carry a measurable film.
2. Features
- Higher throw into box sections, blind areas and weld seams than CE 220
- Higher build on the open surface than CE 220
- Build and throw set on the line against a box cell result
- Deposited at the cathode, so no metal dissolves from the part into the film
3. Recommended uses
Corrosion primer for welded and folded steel assemblies, chassis and box section work where the interior of the fabrication has to carry a measurable film. Used beneath a liquid or powder topcoat on parts exposed to sunlight.
Substrates. Zinc phosphated steel fabrications, welded assemblies, chassis and box section work, and zinc-coated steel. Suited to parts with internal volumes that are vented and drained; sealed cavities remain uncoated whatever the throw of the material.
4. Typical properties
| Property | Typical value | Method |
|---|---|---|
| Technology | Waterborne cathodic epoxy electrocoat, acid-solubilised resin emulsion with pigment paste, high throw formulation | Formulation |
| Supply form | Resin emulsion and pigment paste feeds, with the solubilising acid and correction additives the operating tank consumes | Visual inspection |
| Bath non-volatile content | 18 to 22 per cent by weight | ISO 3251 |
| Bath pH | 5.5 to 6.3 | ISO 19396-1 |
| Bath conductivity | 1200 to 1900 µS/cm, referred to 25 °C | Calibrated conductivity cell, technique as in ISO 7888 for water, no coating specific standard method |
| Dry film thickness, open surface | 25 to 35 µm, high build; interior surfaces finish thinner than the outside | ISO 2178 on uncoated steel; on zinc-coated steel the magnetic reading includes the zinc layer, so the film is measured by difference against the same part before coating, or by eddy current to ISO 2360 where the zinc layer is thick enough for the probe |
| Throwing power, closed four-plate box cell | 200 to 250 mm penetration at the standard cell gap | Closed box cell, in-house method, no published standard |
| Cross-cut adhesion | Classification 0 to 1, 1 mm cut spacing | ISO 2409 |
| Neutral salt spray, scribed panel over zinc phosphate | 500 to 1000 h, creep from the scribe within the agreed limit; a comparative laboratory result, not a prediction of service life | ISO 9227 exposure, assessment to ISO 4628-8 |
| Resistance to condensation humidity | 240 to 480 h, no blistering beyond the agreed rating | ISO 6270-2 exposure, blistering assessed to ISO 4628-2 |
Typical values, not a specification. Values for each batch are given on its Certificate of Analysis.
5. Application
| Parameter | Guidance |
|---|---|
| Method | Cathodic electrodeposition by immersion in a circulating bath, with the part as cathode and anolyte cells removing the acid released at the counter electrode so bath pH stays in control |
| Surface preparation | Multi-stage cleaning and a zinc phosphate conversion coating, rinsed to demineralised water quality; internal volumes vented and drained, as sealed cavities remain uncoated whatever the throw of the material |
| Bath make-up and replenishment | Resin emulsion and pigment paste feeds added to the circulating bath with demineralised water to hold solids; solubilising acid and correction additives dosed as bath analysis requires to hold pH; conductivity held by the anolyte circuit and by ultrafiltrate purge |
| Bath temperature and deposition | 28 to 32 °C; 200 to 300 V DC applied over 150 to 180 s. Higher voltage and a longer coating time raise build and throw within the rupture voltage of the bath, and both are set on the line against a box cell result |
| Rinse | Ultrafiltrate rinse followed by a demineralised water rinse, with dragout returned to the tank |
| Cure schedule | 175 to 190 °C metal temperature for 20 to 25 min at temperature, confirmed by attached thermocouple oven profile |
| Next step or overcoat | Liquid or powder topcoat on parts exposed to sunlight, with intercoat adhesion confirmed on the combined system to ISO 2409 |
Process. Immersion in a circulating cathodic bath at 28 °C to 32 °C, 200 V to 300 V DC applied over 150 s to 180 s, ultrafiltrate and demineralised water rinses, then bake at 175 °C to 190 °C metal temperature for 20 min to 25 min at temperature. Higher voltage and a longer coating time raise both build and throw, within the rupture voltage the bath will tolerate, and both are set on the line against a box cell result rather than assumed.
6. Storage and handling
Store the resin emulsion and pigment paste feeds in closed original containers in a cool, dry place, protected from frost and direct sunlight; the operating bath is kept circulating and is not left standing. 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
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