A resist masks a surface partially with a certain design or coves it all over before finishing, further processing or transporting the material, i.e. it protects a surface against external influence. Applications such as etching, sand blasting, sputtering and selective brushing of metal surfaces are in the focus of the sales programme.
A new and technically interesting area, which opens up many possibilities.
KIWOMASK UV 7322 VP stands out with its very good printing and good cross-linking properties. After cross-linking using a UV light source, the surface is non-sticky and has high mechanical resistance. After partial surface treatment, the resist can be very easily removed either with a solution of 2 – 5 % sodium hydroxide or 3 – 7% sodium carbonate, as well as simply with water.
Besides very good mechanical resistance, KIWOMASK UV 871 is also resistant against acidic etching processes (e.g. ferric(III) chlorid). Excellent printing properties facilitate a sharp-edged print of finest structures. Cross linking by UV light provide short processing cycles without drying time. Aside from the common stripping methods with slightly alkaline stripping products, it can be removed with hot water (60 ° – 80 ° C / 140 ° – 175 ° F).
This product series has very good resistance to acidic and alkaline solutions in etching and galvano baths, as well as to solutions containing hydrogen fluoride (HF).
The resists are ready to use, but may thinned or retarded with KIWOSOLV L 14.
In order to prevent the product from drying on the stencil while printing, KIWOSOLV L 88 can be added to resists. For application on glass, we also recommend the additive KIWOMIX AP 1012 to increase the adhesion.
KIWOMASK W 850 Etch is suitable for physical, vacuum-based coating processes (PVD, magnetron sputter coating) and comes with a good resistance to aqueous cleaning processes. Stripping can be done with soda, soda or potash lye (3 – 5 %), with mild organic solvents (e.g. KIWOCLEAN LM 606) or the ready-to-use solution PREGASOL R 800.
Besides good sandblasting resistance, KIWOMASK® UV 160 / 2 is also resistant to water and organic solvents. Can be easily removed as film. The transparent blue colouring (greenish / yellow after UV cross-linking) offers a good contrast to control print quality, however, at the same time enables the recognition of overprinted designs.
Both are water-based products and are supplied ready to use for different methods of application. KIWOMASK® S 116 HV (HV = high viscosity) has a thicker consistency and is applied preferably with a paintbrush or roller on the surface to be coated. KIWOMASK® S 117 LV (LV = low viscosity) is thinner and supplied ready to use for spray, dip or curtain coating.
KIWOMASK W 128 is colourless, water-based and can be diluted with deionized or distilled water to adjust viscosity. After drying, it is water resistant and very resistant to mechanical stress. For instance, applied as a temporary protection onto scratch-sensitive surfaces (such as glass, metal and various
plastics) prior to further processing steps. It can be dyed black colour by adding MECOCOLOR AF Black and be easily removed as a film again.