What is an Antifreeze? An antifreeze refers to a product that is added to a water solution to decrease the freeze of the solution. The most popular antifreezes are Propylene glycol and Ethylene Glycol
How do you make Antifreeze? How antifreeze is made is by mixing water with glycol. The most common dilutions range between 20% to as high as 50%. The higher the percentage of glycol, the lower the freeze point. Depending on your application, you may choose a propylene glycol that contains a corrosion inhibitor or not.
Antifreeze applications? The most common antifreeze applications are in hot water boilers and cooling water systems, such as HVAC and chillers. These applications typically require a corrosion inhibitor within the formulation. Corrosion inhibitors are used in water systems where corrosion is a concern. A good corrosion inhibitor will protect steel, copper, aluminum, and low grade of stainless steel from corroding. For all stainless steel system, corrosion inhibitors are not required in your formulation and just straight propylene glycol may be used.
Are there food grade antifreezes? A food grade antifreeze is a product that is certified as USP. A USP grade PG may be mixed with water to make a food grade antifreeze.
Which is a better antifreeze Propylene Glycol or Ethylene Glycol? Both chemicals work well as an antifreeze. Ethylene Glycol is a much more toxic product and if safety is a concern when formulating your antifreeze you may choose to use Propylene Glycol. Some very large mills and large systems still use Ethylene Glycol for economic reasons.
What Propylene Glycol should I us in my antifreeze application? Here is a chart that breaks down what Propylene Glycol you want to use in your antifreeze application. You need to deicide if you desire a corrosion inhibitor or not.
These are a general guide for antifreeze formulations. If you have further questions, please contact direct at sales@ChemWorld.com.
Can I use Propylene Glycol as an Antifreeze with PVC or CPVC pipes? This is a tough question. We have no data to support this, but we have received many calls about PVC pipes bursting because of a reaction to Propylene Glycol. We do not know if this was poor material or inefficient glycol levels. The first thing thing most people do is blame the chemical. If this is a concern you should research using glycerin usp at a 50/50 mixture with water.
For more information, please contact us at 800-658-7716 or email our sales consultant at JZajac@ChemWorld.com.