ASTM D4171 Standard Specification for Fuel System Icing Inhibitors
3. Classification
3.1 Two types of fuel system icing inhibitors are provided as follows:
3.1.1 Type I - Ethylene glycol monomethyl ether is used as an anti-icing additive in both aviation gasoline and aviation turbine fuels.
NOTE 1 - Ethylene glycol monomethyl ether (EGME) was previously included in this specification, last appearing in D4171-94. EGME is considered technically satisfactory for this application, but has been generally replaced by DiEGME due to availability, reduced toxicological concerns, and lack of widely available methodology to determine FSII concentration in aviation fuels when a mixture is known to be present, or when the identity of the FSII present in the fuel is not clearly known.
3.2 Type II - Anhydrous isopropanol, also described as 99 % grade 2-Propanol or isopropyl alcohol, is used as an anti-icing additive in aviation gasoline. (Warning - Isopropanol (2-Propanol) is both flammable and an irritant; use with caution.)
3.3 Type III - Diethylene glycol monomethyl ether (DiEGME) is used as an anti-icing additive in both aviation gasoline and aviation turbine fuel. (Warning - Diethylene glycol monomethyl ether, (DiEGME). Combustible, toxic material.)
3.3.1 Test Method D5006 can be used to determine the concentration of DiEGME in aviation fuels.
4. Properties
4.1 Type II - Isopropanol anti-icing additive shall conform to the requirements of Table 1, as manufactured.
4.2 Type III - Diethylene glycol monomethyl ether shall conform to the requirements of Table 2, as manufactured.
5. Sampling
5.1 The material shall be sampled in accordance with Practice E300.
