Technical Data Sheet Solvent-based and UV-curable Dual-Cure screen print varnishes for polycarbonate PC, PMMA, ABS, PVC Very flexible, highest resistances, 2-component system Mara® Cure HY 911 is silicone-free. For silicone-free products it is important to use only thoroughly cleaned stencils, squeegees, ink pumps, tubes (in the case of an automatic ink supply), and injectors for the manual ink filling of the stencil, etc. Mara® Cure HY is a universal, very fast curing hybrid solution (solvent-based/UV) for screen printing applications on the following substrates: • • • • Since all the print substrates mentioned may be different in printability even within an individual type, preliminary trials are essential to determine the suitability for the intended use. Field of use Mara® Cure HY is particularly suited for industrial indoor and outdoor applications, such as interior and exterior applications for the automotive industry, or as surface protection of furniture. The processing steps are as below: 1. Printing of the motif 2. Drying / tempering 3. In case of 3D-applications: Moulding 4. UV-curing process 5. Cutting/stamping/back injection moulding Characteristics Mara® Cure HY is highly reactive and features a very flexible ink film, allowing post-processing steps like moulding (before the UV-curing process), and cutting, stamping or back injection moulding (after the UV-curing process). If cleaning is carried out with automatic screen washing systems, we recommend prior to printing an additional manual cleaning with a fresh cleaner not having had any contact with ink residues containing silicone. Ink Adjustment The ink should be stirred homogeneously before printing and if necessary during production. Mara® Cure HY is a 2-component ink system. Prior to printing, it is essential to add hardener in the correct quantity. This ink/hardener mixture must be stirred homogeneously and adjusted to the right printing viscosity by adding thinner (stir again). Additional venting under vacuum reduces the remaining air and allows printing a most homogeneous surface. When using hardener, the processing and curing temperature must not be lower than 15°C as irreversible damage can occur. Please also avoid high humidity for several hours after printing as the hardener is sensitive to humidity. Pre-reaction time It is recommended to allow the ink/ hardener mixture to pre-react for 15 minutes. Pot life The ink/hardener mixture is chemically reactive and can only be processed within 8 hours, referred to an ambient temperature of 20°C. Higher temperatures reduce the pot life. If the room temperature (> 30° C) or the mentioned Marabu GmbH & Co. KG • Phone +49 7141 6910 • [email protected] • www.marabu-inks.com

Technical Data Sheet times are exceeded, the ink's adhesion and chemical resistance may be reduced even if the ink is still fluid and therefore seems processable. Stress resistance The drying/curing takes place in two steps: 1. Solvent evaporation 2. UV-curing Between these two processes the printed item can be moulded. 1. Solvent evaporation Forced drying, example (15 m / min): Air 100 % Air 100 % IR IR Auto After this procedure the ink film is dust-dry and flexible but not scratch resistant yet. Before the moulding, please allow Mara® Cure HY to post-cure for 24 h or alternatively, the ink...

Technical Data Sheet Printing Parameters Selection of fabric depends on the printing conditions, the desired curing speed and mileage as well as the required opacity. Generally, fabrics of 90-40 bis 120-34 can be used. A uniform screen tension (> 16 N) of all fabrics used is further important. All commercially available capillary films (15-20 µm) or solvent resistant photo emulsions and combined stencils can be used. Shelf Life In order to avoid frost damages, Mara® Cure HY should under no circumstances (not even shortly) be exposed to temperatures lower than 5 °C during transport and storage....