HG - Solvant ink for thermoplastics   For all kinds of thermoplastics, especially polymethacrylates (such as Perspex, Plexiglass, Resartglass etc.), rigid and plasticized PVC, cellulose acetobutyrate, various types of polystyrene and polycarbonate. Screen printing inks HG are quick drying to a high gloss finish and are excellent jet dry inks. The degree of gloss depends on the substrate and, in some cases also on the colour shade. Screen printing inks HG are weather resistant, can be processed easily and they have a relatively mild odour. The colour shades of HG series are highly brilliant despite the fact that they are limited to those pigments which provide maximum light fastness and resistance to plasticizers and solvents. Opacity is medium. As all air drying screen printing inks retain solvents to a certain degree (solvent retention) tests for adhesion and durability on the substrate should not be carried out until one or two days after printing. Due to the aggressive solvents contained in gloss inks HG plastics likely to form tension cracks should be decorated only in sheet form. Also, care must be taken to avoid tension corrosion with mouldings (especially polystyrene and acrylics).   Screen printing inks are delivered in semi-paste form. Depending on printing conditions they are adjusted to a ready-to-print consistency by addition of 15-20% thinner. To take advantage of the very quick drying properties of this ink series only the special thinners may be used.   These are : Thinner VD 50 Retarder VZ 10 for printing of fine details or Retarders VZ 20, VZ 30 and VZ 40   Can of 1 liter