MONOETHYLENE GLYCOL 100%. propylene glycol 100%. you can be also interested in below solution to make your own coolant/ antifreeze.
TRZ 4-in-1 Antifreeze Refractometer Ethylene Glycol, Propylene Glycol black
TRZ 4-in-1 Refractometer Ethylene Glycol, Propylene Glycol in 18cmXD35, Black
TRZ 4in1 Antifreeze Refractometer Ethylene Glycol, Propylene Glycol in Antifr...