Spec-compliant glycol for mixed-metal hydronic systems.
Once you install it, you own the freeze-damage liability. That's why contractors care about spec compliance, mixed-metal and aluminum compatibility, inhibitor longevity, and documented freeze/burst protection, not just price.
Talk to an EngineerWhat you're up against
- You assume freeze-damage liability the moment the system is commissioned
- Mixed-metal and all-aluminum systems need the right inhibitor chemistry
- You need depth-of-TDS proof, not a vague "glycol" SKU
Hydronic and HVAC contractors live with the freeze-damage liability they install. Sub-Frost gives you spec-compliant, fully documented fluids: PGHD for standard mixed-metal systems and PGAL for all-aluminum and high-temperature loops, each with downloadable TDS and SDS and a concentration blended to your job.
The spec
PGHD is a high-phosphate inhibited PG (−60°F to +350°F) meeting ASTM D1384, D8039, and D8040, with a ~15-year design life. For all-aluminum systems and boilers above 150°F, PGAL's organic-acid (OAT) chemistry protects aluminum to 350°F with no phosphates, nitrites, amines, or borates.