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DOWTHERM SR-1

HEAT TRANSFER FLUID

Food & Beverage Processing Page 2

Food Page 1 Food Page 2 Food Page 3

Defrosting/Dehumidifying

Refrigeration Coil Defrosting

In walk-in freezer and chiller units, freezing

tunnels, and basket freezer units, moisture

from the air can condense on refrigeration

coils and a layer of frost can develop. As this frost builds up, compressor motors work harder to maintain proper temperatures and cooling efficiency suffers. To remove condensation from coils and prevent frost formation, cold 35 to 50 percent solutions of DOWFROST ™ is sprayed directly on the coil surfaces. This spraying may be continuous or, “as needed.” The glycols mix with condensation from the coils, lowering the freeze point of the water to prevent frost formation.

Because they contain special corrosion inhibitors, DOWFROST™ and  DOWTHERM™ SR-1  minimize coil corrosion. It is also easy to regenerate and reconcentrate, and production need not be interrupted for defrosting procedures to take place. Defrosting systems using DOWFROST™, and DOWTHERM™ SR-1, are easy to operate and maintain.

Humidity Control

To maintain a constant relative humidity in work and storage areas, meat packers, producers of sausage and processed meats, and slaughterhouses spray DOWFROST™ and DOWTHERM SR-1 fluid through the air that flows over plant refrigeration coils. The sprayed glycol picks up moisture from the air, and filters dust and other particles. High humidity supports growth of mold and bacteria that cannot be tolerated in these operations. Since DOWFROST and DOWTHERM SR-1 are easily reconcentrated, they are very economical in humidity control applications.

For your transfer needs

DOWFROST

DOWFROST has an effective temperature range of -50˚F (-45°C) to 250˚F (120°C) for continuous use. Below -50˚F (-45°C), the increased viscosity of the fluids makes them impractical for use without special equipment. However, the fluids can be used to protect enclosed heat transfer systems from freeze damage at well below -60˚F (-50°C). Heat transfer is generally efficient to 0˚F (-18°C).

DOWFROST™ is not recommended for use as a direct food additive. However, their low toxicity and virtual absence of odor and taste make them suitable for use in food processing operations where accidental contact with food products could occur. As with any fluid used in food processing, good manufacturing practices are required.


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Regulatory status3

U.S. Department of Agriculture (USDA)

DOWFROST  heat transfer fluid is listed as chemically acceptable by the USDA for both defrosting refrigeration coils and for immersion freezing of wrapped meats, poultry, and meat products in plants operated under the federal meat and poultry products inspection program. The compound must be used in a manner that prevents direct or indirect contamination of edible products.

Food and Drug Administration (FDA)

The U.S. FDA clears only individual chemicals, not proprietary products (trademarks). The two ingredients in DOWFROST is generally recognized as safe (GRAS) by the FDA as food additives under Parts 182 and 184 of the Food Additive Regulations. The regulation for propylene glycol is 21 CFR 184.1666; for dipotassium phosphate,182.6285. The propylene glycol and dipotassium phosphate in DOWFROST  meets the requirements of these regulations.

Grade A dairies and meat packing establishments sometimes require a letter certifying the appropriate use and quality of DOWFROST™. Such a letter, along with copies of the acceptance letters from the USDA and a statement of FDA compliance, will be provided to any Dow customer on request.

DOWTHERM SR-1 inhibited ethylene glycol fluid

DOWTHERM SR-1 fluid has an effective use temperature range of -60˚F (-50°C) to 250˚F (120°C).  The lower minimum temperature makes this fluid the preferred medium in the food industry for continuous defrosting of coils in large refrigeration and freezer units where temperatures are too low to use propylene glycol fluids. Because of their moderate oral toxicity, DOWTHERM SR-1 is not used where direct contact with food products is possible.

Below -60˚F (-50°C), the increased viscosity of DOWTHERM™ SR-1  makes it  impractical for use without special equipment. However, these fluids can be used to protect enclosed heat transfer systems from freeze damage at temperatures below -100˚F (-38°). Heat transfer is generally efficient to -10˚F (-23°C).

Regulatory status3

U.S. Department of Agriculture (USDA)

DOWTHERM SR-1 is listed as chemically acceptable by the USDA for defrosting refrigeration coils in plants operated under the federal meat and poultry products inspection program. The compound must be used in a manner that prevents direct or indirect contamination of edible products. Ethylene glycol should not be used in applications in which it can be ingested.

Meat packing establishments sometimes require a letter certifying the appropriate use and quality of DOWTHERM™ SR-1. Such a letter, along with copies of the acceptance letter from the USDA, will be provided to Dow customers on request.

How DOW inhibitors prevent corrosion that plain glycols can encourage

DOWFROST™  and DOWTHERM™ SR-1  provide corrosion protection that can extend system and equipment life—and reduce costly downtime—without compromising heat transfer performance.

Uninhibited glycols oxidize in the presence of air at elevated temperatures, forming organic acids. These acids can lower the pH of the glycol solution, creating an environment for corrosion.

But the inhibitors in DOWFROST™and DOWTHERM™ SR-1 maintain a stable pH by reacting with any organic acids that may be formed. They provide substantial corrosion protection for steel, cast iron, copper, aluminum, brass, and solder as demonstrated by ASTM D1384 corrosion testing.††

3You may need to comply with similar or additional legislation in other countries. Contact your Dow representative for information.
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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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