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Reference Manual
00809-0100-4002, Rev BB
November 2012
Rosemount 1199
5-9
FILL FLUID
SPECIFICATIONS –
PROPYLENE GLYCOL &
WATER
Propylene Glycol
Description
Propylene glycol is commonly used as a raw material for paints and polyester
and alkyd resins, a basic component of brake fluids, an ingredient for deicing /
antifreeze fluids, and a heat transfer fluid. The food grade is also used as a
solvent for flavors, extracts and drugs, as food antioxidants, lubricants, and
mold inhibitors. Being a Generally Recognized As Safe (GRAS) substance, it
may be used as a fill fluid in food, beverage, dairy, and pharmaceutical
applications. Since it has a low coefficient of thermal expansion, it is also a
good choice in applications requiring high performance as long as the
temperature limits are not exceeded. FDA Code of Federal Regulations
reference number: 21CFR 184.1666.
USP grade: These chemicals are manufactured under current Good
Manufacturing Practices (cGMP). These materials meet the requirements
listed in the United States Pharmacopeia (USP). The USP lists each chemical
along with certain specifications the product must meet in order to be
considered a USP product.
FCC grade: These products meet the specifications listed in the Food
Chemicals Codex. This is a book of specifications written by the Food and
Nutrition Board, the Institute of Medicine, and the National Academy of
Sciences. The chemicals that carry the FCC name are considered “Food
Grade.”
A Vapor Pressure Curve does not exist for Propylene Glycol and Water.
Temperature Limits:
At Atm Pressure
-17 to 93 °C (0 to 200 °F)
Viscosity at 25 °C (77 °F)
2.85 cs
Specific Gravity @ 25 °C (77 °F)
1.02
Coefficient of Thermal Expansion
0.00034 cc/cc/C (0.00019 cc/cc/F)
Chemical Composition:
30% USP & FCC grade propylene glycol and 70%
water (by volume)
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