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DOWTHERM™
SR-1 HEAT TRANSFER FLUID Food & Beverage Processing Page 3
   Table 1 shows the corrosion rates of common metals exposed to DOWFROST™and
DOWTHERM™ SR-1 fluids, as well as two uninhibited glycol solutions and plain water. The presence of excessive amounts [>50 ppm (>50 mg/kg)] of contaminants such as chlorides, sulfates or ammonia could contribute to corrosion not evident in the tests used to prepare this data. †DOWFROST™ and DOWTHERM™ SR-1 fluids should not be used with aluminum above 150°F (65°C). ††DOWFROST™and DOWTHERM™ SR-1 are not recommended for use with galvanized steel. The zinc in the galvanized coating could react with inhibitor components, thus precipitating out of the fluid and causing fouling as well as inhibitor depletion. For ongoing corrosion protection, DOWFROST™ and DOWTHERM™ SR-1 are easily analyzed to determine corrosion inhibitor condition. If the inhibitors are depleted, Dow can supply additional
inhibitors so the fluid is economically reinhibited rather than replaced. Dow provides complete fluid support services including free analysis
DOWFROST™ and DOWTHERM™ SR-1, and fluids are backed by comprehensive Dow supporting services. With extensive experience in supplying heat transfer fluids to the food industry, Dow technical service personnel can help you design, operate and maintain your thermal fluids system for maximum productivity and economy. For systems containing 250 gallons of fluid or more (or more than 10,000 liters in Europe), Dow offers free fluid analysis. Typically performed on an annual basis, the analysis includes determination of current fluid inhibitor and glycol levels, plus Dow’s recommendations for maintaining proper corrosion protection and thermal performance capabilities. Dow also provides assistance to operators of smaller systems so that they can conduct their own on-site fluid analyses. Call for more information
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Table 1. Corrosion Test Results/Weight Loss in Milligrams (mils penetration per year)
| Ethylene | DOWTHERM™ | Propylene | |
|---|
| Water | Glycol | SR-1 | Glycol | DOWFROST |
|---|
| Copper | 2 | 4 | 3 | 4 | 3 |
|---|
| (0.08) | (0.16) | (0.12) | (0.16) | (0.12) |
|---|
| Solder | 99 | 1780 | 4 | 1095 | 1 |
|---|
| (3.14) | (56.5) | (0.13) | (34.7) | (0.03) |
|---|
| Brass | 5 | 11 | 3 | 5 | 4 |
|---|
| (0.23) | (0.46) | (0.12) | (0.20) | (0.16) |
|---|
| Mild | 212 | 974 | 1 | 214 | 1 |
|---|
| Steel | (9.69) | (44.5) | (0.04) | (9.80) | (0.04) |
|---|
| Cast | 450 | 1190 | 3 | 345 | 3 |
|---|
| Iron | (21.2) | (55.7) | (0.13) | (16.2) | (0.15) |
|---|
| Alumi | 110 | 165 | 4 | 15 | +2 |
|---|
| num | (13.2) | (19.8) | (0.44) | (1.80) | (+0.26) |
|---|
Samples with a “+” showed weight gain ASTM D1384 – 190°F (88°C) for 2 weeks, 30% by volume glycol, air bubbling DOWFROST™and DOWTHERM™ SR-1
Inhibited glycol heat transfer fluids for food industry applications Table 2. Typical Physical Properties†† of DOWFROST™and
DOWTHERM™ SR-1, Fluids
| DOWFROST ™ | DOWTHERM™ SR-1 | | Inhibited | Inhibited | | Propylene Glycol | Ethylene Glycol | | Useful Operating Temperature | -45°C (-50°F) to | -50°C (-60°F) to | | 120°C (250°F) | 120°C (250°F) | | Freezing Point, °C (°F) 50% | -28 (-34) | -34 (-37) | | Viscosity 50% at 5°C (40°F) | 13.77 (14.2) | 6.63 (6.8) | | mPa(s) 80°C (180°F) | 1.12 (1.1) | 0.98 (0.94) | | (cps) 120°C (250°F) | 0.60 (0.59) | 0.53 (0.52) | | 175°C (350°F) | NA | NA | | Thermal Conductivity 50% at 5°C (40°F) | 0.353 (0.204) | 0.368 (0.212) | | W/(m)(K) 80°C (180°F) | 0.382 (0.221) | 0.411 (0.238) | | [Btu/(hr · ft2)(°F/ft)] 120°C (250°F) | 0.380 (0.219) | 0.417 (0.241) | | 175°C (350°F) | NA | NA | | Specific Heat 50% at 5°C (40°F) | 3.478 (0.830) | 3.223 (0.770) | | kJ/(kg)(K) 80°C (180°F) | 3.767 (0.902) | 3.512 (0.842) | | [Btu/(lb · °F)] 120°C (250°F) | 3.921 (0.937) | 3.667 (0.878) | | 175°C (350°F) | NA | NA | | Specific Gravity 15/15°C (60/60°F) | 1.050–1.060 | 1.1250–1.1350 | | Flash Point | | | | Concentrate | | | | Pensky-Martens Closed Cup (PMCC) | 101°C (214°F) | | | Tag Closed Cup | | 111°C (232°F) | | Aqueous Solutions up to 80% Glycol | | | | Pensky-Martens Closed Cup (PMCC) | No Flash Point | No Flash Point |
†† Typical properties, not to be construed as specifications. Note: Specified concentrations are based on volume percent. Copyright © The Dow Chemical
Company (1995-2009). All Rights Reserved.
®™* Trademark of The Dow Chemical Company ("Dow") or an
affiliated company of Dow For further information, call…
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NOTICE: No freedom from any patent owned by Seller or others is to be
inferred. Because use conditions and applicable laws may differ from one
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determining whether products and the information in this document are
appropriate for Customer’s use and for ensuring that Customer’s workplace and
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information in this document. NO WARRANTIES ARE GIVEN; ALL IMPLIED WARRANTIES
OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE ARE EXPRESSLY EXCLUDED.
Copyright © The Dow Chemical
Company (1995-2009). All Rights Reserved.
®™* Trademark of The Dow Chemical Company ("Dow") or an
affiliated company of Dow |
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