What types of corrosion inhibited glycol are there? There are 2 main groups of corrosion inhibited propylene glycol, USP grade inhibited glycol and inhibited propylene glycol.
Examples of USP grade inhibited glycol are JeffCool and Dowfrost. These products are approved for water systems that require USP certification for incidental food contact. These products should never be used directly in food.
The second is just a 95% inhibited glycol product. This product is designed for water systems that do not require USP certification. ChemWorld IPG may be used in this application.