For a long time there have been two basic classes of purging compounds for plastics processing equipment - chemical purging compounds and mechanical purging compounds. Each class offers advantages and disadvantages to the processor. Recently, NOVACHEM introduced a new, third class of purging compound that combines advantages of each of the legacy classes while mitigating their disadvantages.
Chemical purging compounds have been regarded as the most effective products with regard to their ability to facilitate dark-to-light color changes or material changes and to control degradation. But they require the user to adhere closely to a multi-step process and they need a fair amount of time to do their work.
Mechanical purging compounds are, in contrast, easy to use ("Just run it through!") and are comparatively quick. Their downside is that they are just not as effective in difficult purging situations as chemical purging materials. Sometimes that's OK, but sometimes it isn't.
The new family of HYBRID™ Purging Compounds from NOVACHEM are formulated to provide effectiveness comparable to chemical purging compounds while offering ease-of-use and quickness similar to mechanical purging compounds. They can give the processor the "best of both worlds."
To get a good overview of these new products, please visit the HYBRID™ Purging web site.