When laser machines are used in an environment where power failures frequently occur or there is no condition to empty the cooling water every day, adding antifreeze is a must to prevent your machine from freezing in the cold weather. Antifreeze does not cause rust or corrosion of metal parts, rubber hoses and other accessories of laser machine. When selecting the antifreeze, it should be noted that the freezing point of antifreeze agent has to be 5℃ below the lowest temperature of operating environment.

1. Using ethanol as an antifreeze for short-term treatment
When power failure occurs or it is difficult to empty cooling water, ethanol may be used as a temporary treatment for short-term antifreeze by adding it in deionized water or pure water. The adding volume can not exceed half full of the tank. Considering that ethanol has highly corrosive effects, the ethanol mixture must be emptied within a week and it is necessary to clean the cooling pipeline with pure or deionized water.

2. Using special antifreeze of professional brands
Professional brand antifreeze is recommended, generally two models of antifreeze especially for laser engraving machine:
Antifrogen N (ethylene glycol based coolant): industrial product, toxic to human beings;
Antifrogen L (propylene glycol based coolant): food grade, non-toxic to human beings;
These two types of coolant can be easily found in the market.
Note: there is no antifreeze can entirely replace deionized water for continuous use through the year. When the winter is over, deionized water or pure water has to be used to clean the pipeline and used as the cooling water.