Arcveil SO 220 Opaque Scratch-Off Layer
A heavily pigmented opaque scratch layer printed in two passes over Arcveil SO 110 to conceal variable data under transmitted light and to come away cleanly under a coin. It cannot be run without the undercoat and is quoted and qualified with it as a matched pair.
Grade Arcveil SO 220 | Range Scratch-Off, Security and Coding Coatings | Technology Heavily pigmented water-based dispersion for flexo; water-based or ultraviolet-curing for rotary screen
Technical Data Sheet
Arcveil SO 220
Issue 2026.09
1. Product description
A heavily pigmented opaque top layer printed over Arcveil SO 110, applied in two passes to build the coat weight the panel needs. It is specified on read-through under transmitted light, on clean and complete removal under a coin, and on comparative resistance to solvent rubbing and to mechanical lifting, measured as a bench check to a stated procedure rather than as a security rating. It carries the higher film build of the pair and cannot be run without the undercoat.
2. Features
- Specified on read-through under transmitted light, supported for white and light-coloured grades by a contrast ratio of 0.97 to 0.99
- Complete removal under a coin over the matched undercoat
- Comparative bench checks against solvent rubbing and mechanical lifting, not a security rating
- Water-based for flexo; water-based or ultraviolet-curing for rotary screen
- Built to 8 to 16 g/m2 dry over two passes
3. Recommended uses
Opaque scratch-off panels on telecom recharge and airtime cards, promotional game cards and similar paper and board items, always printed over Arcveil SO 110. Where an end use is audited, for example lottery, gaming or high-value documents, the issuing authority sets the test and acceptance level, and Arctic holds no security accreditation.
Substrates. The same paper and board grades as Arcveil SO 110, applied over a fully covered undercoat panel. It is not specified for direct application to filmic facestock.
4. Typical properties
| Property | Typical value | Method |
|---|---|---|
| Technology | Heavily pigmented water-based dispersion for flexo; water-based or ultraviolet-curing for rotary screen | Formulation |
| Appearance | Heavily pigmented opaque liquid | Visual |
| Supply viscosity, water-based flexo grade | 30 to 40 s, 4 mm flow cup at 23 degrees C | ISO 2431 |
| Supply viscosity, screen and ultraviolet-curing grades | 300 to 2,500 mPa.s at 25 degrees C, cone and plate | ISO 2884-1 |
| Non-volatile content | 45 to 60 per cent by weight for water-based grades; 98 to 100 per cent for the ultraviolet-curing screen grade | ISO 3251 |
| Density at 23 degrees C | 1.15 to 1.35 g/cm3 | ISO 2811-1 |
| pH, water-based grades | 7.5 to 9.5 | ASTM E70 |
| Contrast ratio of the dried or cured layer | 0.97 to 0.99 on a black and white contrast chart at the spreading rate agreed at the trial, for white and light-coloured grades; metallic and dark grades are specified on read-through only | ISO 6504-3 |
| Read-through of the finished panel | Concealed data not legible under transmitted light at the agreed illuminance, assessed against the signed reference sheet | In-house, transmitted light |
| Coin removal and bench resistance | Complete removal under a coin with no smearing or residue; under solvent rubbing and lifting attempts the panel disrupts rather than clearing or lifting intact | In-house comparative bench check to a stated procedure |
Typical values, not a specification. Values for each batch are given on its Certificate of Analysis.
5. Application
| Parameter | Guidance |
|---|---|
| Method | Two passes on a flexo coating unit with chambered doctor blade and anilox, or on rotary screen where a heavier deposit is wanted |
| Surface preparation | Over a fully covered, dry Arcveil SO 110 panel that is at least as large as the scratch layer and in register with it; not specified for direct application to filmic facestock |
| Dilution | Stir to uniform before use; water-based grades adjusted with water only to the press viscosity set on the trial; the ultraviolet-curing grade is not diluted |
| Applied coat weight | 8 to 16 g/m2 dry over two passes, equivalent to a dry film thickness of about 5 to 12 micrometres (ISO 2808); too little reads through, too much becomes brittle and powders under the coin |
| Drying or cure | Full interstation hot-air drying or ultraviolet cure between passes, so the second pass does not soften the first; conditions set on the press trial |
| Checks | Read-through and coin removal on the trial sheets and then on every run |
| Finished sheets and reels | Stacking, winding and reel storage agreed on the press trial so that the panels do not block |
Process. Two passes on a flexo coating unit with a chambered doctor blade and anilox, or rotary screen where a heavier deposit is wanted, supplied water-based for flexo and water-based or ultraviolet-curing for screen. Full interstation drying or curing between passes. Panel read-through and coin removal are checked on the trial sheets.
6. Storage and handling
Store in the original closed container at moderate temperature, with water-based grades protected from frost and the ultraviolet-curing grade protected from light; shelf life is stated on the label and Certificate of Analysis. Handling guidance is given in the Safety Data Sheet, issued on request. 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.