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NuTherm™ HC-40 High performance, Potassium Formate/Water-based closed system heat transfer fluid ideal for low temperature applications

  • Heat transfer in open system
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Part Number: nt-hc40
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Specifications
  • Primary Application: Heat transfer fluid
  • Water based: Yes
  • Key ingredient: Potassium Formate
  • Specific Gravity (g/cm3): 1.315
  • Boiling Point: 115°C (239°F)
  • Freezing Point: -50°C (-58°F)
  • Lowest Op. Temp.: -40°C (-40°F)
  • System: Closed
Description:
NuTherm™ HC-40 is a high-performance heat transfer fluid designed as an alternative to less effective glycol, PAG, and Calcium Chloride open bath fluids.  NuTherm HC-40 is non-toxic, non-flammable, and has a robust corrosion inhibition package making it ideal for use in closed systems down to -30°C (-22 °F) and up to 218 °C (425 °F). 

NuTherm HC-40 has superior thermophysical properties in comparison to traditional closed system heat transfer fluids, including higher thermal conductivity and specific heat, as well as lower viscosity, making it an extraordinarily more efficient closed system coolant within its operational temperature range.  NuTherm HC-40 is non-hazardous, biodegradable, CFC-free, antimicrobial, and has exceptional thermal stability at high temperatures in comparison to glycols, PAG’s, Calcium Chloride, Trichloroethylene and Methylene Chloride (Dichloromethane) making it an intelligent alternative.  NuTherm HC-40 is formulated with a incredibly robust and efficient corrosion inhibition package, allowing the product to be used on most metals including Stainless Steel, Carbon Steel, Cast Steel, Copper and its alloys (Brass & Bronze), Monel, Nickel, Hastelloy, Inconel, Tantalum, Titanium, Titanium alloys (Ti6Al4V), Aluminium and Cast Iron.  Do not use on Zinc, Zinc-plated or galvanized metals, Magnesium.  NuTherm HC-40 corrosion tests at 80 °C show incredible results of x mmpy (x mpy) on C260 Brass alloys, x mmpy (x mpy) on 304L Stainless Steel, and x mmpy (x mpy) on AL1100 Aluminium.  NuThem HC-40 does not produce pitting corrosion on Aluminium alloys like other Potassium Formate open bath heat transfer fluids.

*mmpy = millimeters per year; mpy = mils per year (1 mil = 0.001 inch); In general, uniform corrosion rates less than 2 mpy are acceptable for most applications.  Corrosion rates between 2 and 10 mpy are considered marginal and may impact useful life of the equipment.  Corrosion rates greater than 10 Mils per year are unacceptable.

NuTherm HC-40  
BULK DENSITY 10.97 #/gal
SPECIFIC GRAVITY @ 20 °C 1.315 g/cm³  
TEMPERATURE RANGE (CLOSED SYSTEM) -40 to 218°C (-40 to 425°F)
THERMAL STABILITY HIGH
ODOR ODORLESS  
FLASH POINT (°C) NONE
FIRE POINT (°C) NONE
MELTING POINT / FREEZING POINT   -50°C (-58°F)  
BOILING POINT   115°C (239°F)
pH    8.0 to 8.5
APPEARANCE and COLOR    CLEAR, COLORLESS to AMBER
 
Temperature (°F) Viscosity (cPs) Thermal Conductivity (BTU/hr•ft•°F) Specific Heat (BTU/lb•°F) Density (lb/ft3)
-40 14.90 0.264 0.669 84.0
-20 8.80 0.271 0.675 83.6
0 6.10 0.277 0.681 83.2
20 4.50 0.284 0.687 82.8
40 3.50 0.290 0.693 82.5
60 2.90 0.297 0.699 82.1
80 2.40 0.303 0.705 81.7
90 2.20 0.307 0.708 81.5
100 2.00 0.310 0.711 81.3
120 1.70 0.316 0.717 80.9
140 1.50 0.323 0.723 80.5
160 1.30 0.330 0.729 80.1
180 1.20 0.336 0.735 79.8
200 1.10 0.343 0.741 79.4
220 0.95 0.349 0.747 79.0
240 0.86 0.356 0.753 78.6
260 0.79 0.362 0.759 78.2
280 0.72 0.369 0.765 77.8
300 0.66 0.375 0.771 77.4
320 0.61 0.382 0.777 77.0
340 0.56 0.388 0.784 76.7
360 0.52 0.395 0.790 76.3
380 0.49 0.401 0.796 75.9
400 0.45 0.408 0.802 75.5
420 0.42 0.414 0.808 75.1
425 0.42 0.416 0.809 75.0
Temperature (°C) Viscosity (mPa•s) Thermal Conductivity (W/m•K) Specific Heat (kJ/kg•K) Density (kg/m3)
-40 14.90 0.449 2.80 1348
-40 9.20 0.459 2.82 1343
-20 6.50 0.469 2.84 1337
-10 4.90 0.479 2.87 1332
0 3.90 0.489 2.89 1326
10 3.20 0.499 2.91 1321
20 2.70 0.509 2.93 1315
30 2.30 0.519 2.96 1309
40 1.96 0.529 2.98 1304
50 1.70 0.539 3.00 1298
60 1.50 0.549 3.03 1293
70 1.40 0.559 3.05 1287
80 1.20 0.569 3.07 1281
90 1.10 0.579 3.09 1276
100 0.99 0.589 3.12 1270
110 0.91 0.599 3.14 1265
120 0.83 0.609 3.16 1259
130 0.77 0.619 3.19 1253
140 0.71 0.629 3.21 1248
150 0.66 0.639 3.23 1242
160 0.61 0.649 3.25 1237
165 0.59 0.654 3.27 1234
170 0.57 0.659 3.28 1231
180 0.53 0.669 3.30 1225
190 0.50 0.679 3.32 1220
200 0.47 0.689 3.35 1214

Vapor Pressure

Temperature (°C) Temperature (°F) Vapor Pressure (psia)
20 68 0.22
30 86 0.32
40 104 0.55
50 122 0.97
60 140 1.67
70 158 2.72
80 176 4.24
90 194 6.35
100 212 9.21
110 230 13.0
120 248 17.9
130 266 24.2
140 284 32.3
150 302 42.4
160 320 55.0
170 338 70.4
180 356 89.4
190 374 112.4
200 392 14.1
210 410 173.2
218 424 204.2

Gasket & Polymer Compatibility

Material Compatibility
Nitrile / NBR Excellent to 150°F, Good above 150°F
Hydrogenated Nitrile / HNBR Excellent
Ethylene Propylene / EP, EPDM Excellent
Chloropropene Good
Isobutylene / IIR Latex Good
Synthetic Isoprene / NR (Natural Rubber) Good / Excellent
Natural Isoprene / NR (Natural Rubber Good / Excellent
Chemraz Kalrez / FFKM Excellent
PTEF / FEP (Teflon) Excellent
Gylon Style 3500,3504, 3510 Excellent
Nylon / Polyamide Good / Excellent
Polyvinyl Chloride / PVC Good / Excellent
Polyethylene Excellent
Polypropylene Excellent
Epoxy Good / Excellent
Graphite Excellent

Metals Compatibility (Closed System)

Material Compatibility
Aluminium* Compatible
Cast Steel Compatible
Monel Compatible
Brass Compatible
Copper Compatible
Nickel Compatible
Bronze Compatible
Hastelloy Compatible
Stainless Steel Compatible
Carbon Steel Compatible
Inconel Compatible
Tantalum Compatible
Cast Iron* Compatible
Incoloy 825 Compatible
Titanium Compatible
Ti6Al4V Compatible
Zinc** Incompatible
Zinc Plating** Incompatible
Galvanized Surfaces** Incompatible
Magnesium** Incompatible

*Recommended for use only in closed, airtight systems that have been purged with an inert gas, such as Nitrogen, in the headspace. 

**May be used for support framing, electrical conduit, and structural components.  If product spills or splashes on any metals, rinse immediately with water to prevent surface discoloration.

***Gylon® is a registered trademark of Garlock which is an Enpro Industries, Inc. company.

NuTherm™ HC-40 high-performance heat transfer fluid designed as an alternative to less effective glycol, PAG, and Calcium Chloride open bath fluids.