The thermochromic materials are mixed and micro-encapsulated in our labs, then dried and milled, and added into a carrier resin which is extruded, cooled and then chipped or cut into small granule pellets approximately 2mm long.
We usually use eva and universal carriers.
Let down addition rates are normally between 3% and 6% depending on the colour strength required; or higher dosing for thinner products (sub 1mm thick) such as extruded drinking straws.
The best colours are achieved by using the clearest raw base polymers.
We produce masterbatches with activation temperatures (the point where the colour changes) from -15C up to +70C.
The colour change is not sudden but occurs over several degrees.
Thermochromic masterbatch is always a darker colour when colder, and a lighter colour when hotter.
Temperatures should always be kept to below 220C, in all parts including during heating through the barrel. At higher temperatures or if left dwelling at high temperature, the thermochromic can discolour, burn or lose its colour changing properties.
Thermochromic masterbatches are compatible in polypropalene, polystyrene, HIPS, EVA, HDPE, ABS, PU, TPE, TPU, PVC.
Available as either Single Colour, or Colour to Colour. (We do also make triple colour masterbatches on request).
Single Colour: This is coloured when the temperature drops below the masterbatch’s activation temperature, and semi white when warmed above this temperature. We supply a range of colours, such as white to blue, white to green, white to red.
Colour to Colour: This is a darker colour when the temperature drops below the masterbatch’s activation temperature, and a paler colour when warmed above this temperature. We supply a range of colours, for instance when heated: purple to pink, orange to yellow, green to yellow.
Triple colour: This becomes lighter colours when heated, or darker colours when cooled, for instance yellow to orange to red. Or white to pink to purple.