Glycol Freeze Protection Mix
Glycol percent and concentrate gallons from manufacturer freeze-point curves.
Example
You enter
- System volume (gal) 50
- Target protection (°F) -10
- Glycol type propylene
You get
- Glycol percent 41.43
- Concentrate to add 20.7 gal
Checked against published worked examples from: Dow.
Details, formula, and sources
Formula or tableLinear interpolation across manufacturer freeze-point curves for propylene glycol and ethylene glycol; gallons of concentrate = system_volume × concentration_target.
Source and editionManufacturer freeze-point curves (Dow Dowfrost / Dowtherm SR-1) by name.
Free accessFree at dow.com / chemours.com technical bulletins.
What governsEstimate. AHJ and licensed plumber / gas fitter govern. Verify against the IPC / IFGC edition adopted in your jurisdiction.
API field namessystem_volume_gal, target_burst_F, glycol_type, glycol_percent, concentrate_gal
- Curve table data/plumbing/glycol-curves.json keyed to glycol typeDow technical bulletins