lp-585 Rev. 000 Rel. 001 Date 9.10.18
20
VISCOSITY:
The HTF viscosity over the service temperature range is
based on a specific gravity 15/15
o
C (60/60
o
F) 1.053-1.063. DOWFROST
inhibited glycol-based fluid has an effective operating temperature
range of -50
o
F to 250
o
F. At temperatures below -50
o
F, increased
viscosity (>1,000 centipoise) can make use of DOWFROST impractical
unless larger pumps are installed. At the upper end of the operating
range for DOWFROST fluid, a maximum bulk temperature of 250
o
F is
recommended. Film temperature should not exceed 300
o
F. DOWFROST
fluid can tolerate brief temperature excursions up to 100
o
F above the
maximum recommended temperatures. However, extended exposure
of the fluid to temperatures in excess of 50
o
F above the maximum
recommended temperatures will result in accelerated degradation
of the glycol and inhibitor systems. In addition, the film temperature
should remain within 50
o
F of the bulk fluid temperature and the
pressure at all points in the system should be at least 5 psi greater than
the vapor pressure exerted by the fluid to avoid localized boiling and
resulting precipitation. At temperatures above 150
o
F, the system must
be closed to avoid rapid oxidation of the propylene glycol, inhibitor
depletion, and subsequent increased corrosion. Automatic make-
up water systems should be avoided in order to prevent undetected
dilution or loss of glycol and consequent loss of freeze and corrosion
protection.
FLAMMABILITY:
When mixed with water, DOWFROST is not
flammable, as the fluid has no measurable flash point (Pensky-Martens
Closed Cup) in concentrations up to 80% glycol. Undiluted DOWFROST
has a flash point of 214
o
F (Pensky-Martens Closed Cup). It is possible
to ignite solutions of propylene if enough water has been vaporized
and the concentration of propylene glycol increases to greater than
80 percent.
INSPECTION AND TREATMENT OF HEAT TRANSFER FLUID:
You
can quickly determine the condition of your fluid by examining its
appearance and odor. Any drastic variation from the initial fluid
specifications, such as a black or dark-grey color, presence of an oily
layer, burnt odor, or any heavy sludge in the fluid may indicate the
need for replacement.
TESTING THE FLUID pH LEVEL:
Control of pH between 8 and 10 is
important to minimize corrosion and glycol degradation. Using narrow
range pH paper, such as pHydrion Control paper with a 7.2 to 8.8 pH
range, is an easy and reliable way to read your pH level. A pH tester
can also measure alkalinity or acidity and give you an indication of the
reserve alkalinity or inhibitor level of the fluid. The desirable pH range
should fall between 8.0 and 10.0. Adjustments can be made using a
50% solution of sodium hydroxide or potassium hydroxide if the pH is
approaching the acidic range (below 8.0). An inexpensive pH tester is
available from Misco Products. The accuracy of this product is +/- 0.5
pH. Contact Misco Products at 1-800-358-1100 and ask for the Dow
discount.
SPILL, LEAK, AND DISPOSAL PROCEDURES:
Using appropriate safety
equipment, small spills may be soaked up with common absorbent
material. For large spills, the fluid should be pumped into suitable
containers located in diked areas. Residual material should be cleaned
up with water. Concentrate can be handled according to local, state,
and federal regulations.
EMERGENCY OVERVIEW
POTENTIAL HEALTH EFFECTS
EYE:
May cause slight transient (temporary) eye irritation.
Corneal injury is unlikely. Mists may cause eye irritation.
FIRST AID: FLUSH EYES WITH PLENTY OF WATER
SKIN CONTACT:
Prolonged contact is essentially non-irritating to skin.
A single prolonged exposure is not likely to result in the material being
absorbed through the skin in harmful amounts. Repeated exposure
may cause flaking and softening of skin.
FIRST AID: WASH OFF IN FLOWING WATER OR SHOWER
INGESTION:
Single dose oral toxicity is considered to be extremely
low. No hazards anticipated from swallowing small amounts
incidental to normal handling operations.
FIRST AID: NONE REQUIRED
INHALATION:
At room temperature, vapors are minimal due to
physical properties. Mists may cause irritation of upper respiratory
tract (nose and throat).
FIRST AID: REMOVE TO FRESH AIR.
IF EFFECTS OCCUR, CONSULT A PHYSICIAN.
NOTE TO PHYSICIAN: NO SPECIFIC ANTIDOTE.
SUPPORTIVE CARE. TREATMENT BASED ON
JUDGEMENT OF THE PHYSICIAN IN RESPONSE TO
THE REACTION OF THE PATIENT. CONSULT DOW CHEMICAL
24 HOUR EMERGENCY 1-989-636-4400
Summary of Contents for Drain Back
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