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Halocarbon 4.2 is the standard inert fluid offering with Rosemount remote seals. 4.2 fill fluid

refers to the viscosity in centistokes at 100 °F. Inert fill fluids are essentially non-reactive to a

wide range of chemicals, including halogens, oxygen, and other specialty gas applications.

Other applications to consider using Inert Fluid include those where silicone fluids are banned

due to product contamination concerns (i.e. paint manufacturing). Inert fluid has a higher vapor

pressure than standard Silicone 200 and restricts applications, especially in vacuum service.

Inert fluid should not be used for food grade applications.

Figure 1-6. Inert (Halocarbon) Vapor Pressure Curve

0

200

400

600

800

1000

Atm

14

12

10

8

6

4

2

0

Inert (Halocarbon)

Process Temperature [°C (°F)]

60

(140)

75

(167)

90

(194)

105

(221)

120

(248)

135

(275)

150

(302)

165

(329)

180

Halocarbon 4.2 oil is a low molecular weight polymer of chlorotrifluoroethylene (PCTFE). This inert oil is manufactured by a controlled polymerization process and then is stabilized to give it some very unique properties.

This oil is safe, nonflammable, and chemically inert – safe for oxygen, chlorine and most reactive gas services. It has good lubricity, high thermal stability, and low compressibility.

Halocarbon 4.2 oil is one of the lower viscosity inert oils that is manufactured by Halocarbon Products. Typical applications of Halocarbon 4.2 oil are as an inert instrument fill fluid and as a mechanical seal oil. Please see the SDS for more details.