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Disclaimer of Liability: Baker Petrolite Corporation and its affiliates (BPC) disclaim all warranties or representations express or implied, 

including any implied warranties of merchantability or fitness for a particular purpose or to the accuracy, correctness or completeness of such 

information herein or that reliance on such information will accomplish any particular result. All such information is furnished “as is” and by 

using such information the user is assuming all liabilities for the use or reliance on such information. BPC SHALL NOT BE LIABLE FOR ANY 

INDIRECT, SPECIAL, PUNITIVE, EXEMPLARY OR CONSEQUENTIAL DAMAGES OR LOSSES FROM ANY CAUSE WHATSOEVER 

INCLUDING BUT NOT LIMITED TO ITS NEGLIGENCE.

Executive Summary: 

The formula for MFA-10 has been modified, which impacts the Octamix waiver associated with 

this product. A modification to this waiver is being pursued. Part of this process is to provide the 

EPA with corrosion testing to demonstrate product efficacy. As such, corrosion testing was 

conducted on the original and modified MFA-10. (The modified version is being called 

TOLADTM MFA-10A.) The testing was based upon prescribed conditions set forth in a 

document detailing the waiver and treat rate approved in this waiver.

According to the waver, the following conditions must be met:

The final fuel consists of a maximum of five percent by volume methanol, a minimum of 

2.5 percent by volume co-solvent in unleaded gasoline. The co-solvents are any one or a 

mixture of ethanol, propanols, butanols, pentanols, hexanols, heptanols and octanols,

within the following constraints: the ethanol, propanols and butanols or mixtures thereof 

must compose a minimum of 60 percent by weight of the co-solvent mix, whereas a 

maximum limit of 40 percent by weight of the co-solvent mix is placed on the pentanols, 

hexanols, heptanols and octanols or mixtures thereof. Furthermore, the heptanols and 

octanols are limited to a maximum five percent by weight of the higher molecular weight 

alcohol mix (pentanols, hexanols, heptanols and octanols).

Based on this guidance, an “octamix” blend was prepared in the lab consisting of 92.5% regular 

unleaded gasoline, 5% methanol and 2.5% denatured fuel grade ethanol. This mixture did not 

prove to be significantly corrosive, so testing was also conducted on the gasoline alone, as well 

as a mixture of gasoline and fuel ethanol. Also, due to the lack of corrosivity of the “octamix” 

blend, some common corrosive agents were added to facilitate product comparison and testing.

Based on the testing conducted, the two formulations TOLADTM MFA-10 and TOLADTM MFA10A are equivalent in performance. See Tables 1 & 2 for test results.

Test Method:

NACE Standard TM-01-72: Anti-Rust Properties of Cargoes in Petroleum Product Pipelines

Three hundred milliliters of the test sample was measured into a chemically clean and dry

beaker. After preparation by polishing, the steel test specimen was immersed in the test fuel 

solution, together with thermometer and stirrer, and placed into the water bath previously heated 

to 38 ± 1°C (100 ± 2°F). After stirring for 30 minutes, 30 ml of distilled water was added. 

Stirring of the sample continued for an additional 3.5 hours before the final inspection was made 

with a lighted glass of 2x magnification. The test spindles were rated according to the scale in

Table 2.

NACE Testing of MFA-10 additive
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Disclaimer of Liability: Baker Petrolite Corporation and its affiliates (BPC) disclaim all warranties or representations express or implied, 

including any implied warranties of merchantability or fitness for a particular purpose or to the accuracy, correctness or completeness of such 

information herein or that reliance on such information will accomplish any particular result. All such information is furnished “as is” and by 

using such information the user is assuming all liabilities for the use or reliance on such information. BPC SHALL NOT BE LIABLE FOR ANY 

INDIRECT, SPECIAL, PUNITIVE, EXEMPLARY OR CONSEQUENTIAL DAMAGES OR LOSSES FROM ANY CAUSE WHATSOEVER 

INCLUDING BUT NOT LIMITED TO ITS NEGLIGENCE.

.

Table 1 NACE TM-01-72 Corrosion Test Results

Product Treat Rate Rating 

(“Octamix”)

Rating (gasoline 

+ 2.5% EtOH)

Rating 

(gasoline only)

None 0 B++ C D

TOLADTM MFA-10 42.7 mg/L A A A

TOLADTM MFA-10A 42.7 mg/L A A A

Table 2 NACE TM-01-72 Corrosion Test Results

Product Treat Rate Rating 

(“Octamix”)*

Rating 

(“Octamix”)**

None 0 C D

TOLADTM MFA-10 42.7 mg/L B+ B

TOLADTM MFA-10A 42.7 mg/L B+ B

* Increased corrosivity due to addition of formic & acetic acids

** Increased corrosivity due to addition of formic & acetic acids and sodium chloride

Table 3 NACE TM-01-72 Test Rating Scale

Rating Percentage of Test Surface Rusted

A None

B++ Less that 0.1% (2 or 3 spots of no more than 1 mm diameter)

B+ Less than 4%

B 5 to 25%

C 25 to 50%

D 50 to 75%

E 75 to 100%

Conclusions/Recommendations:

TOLADTM MFA-10 and TOLADTM MFA-10A, were shown to be equivalent in performance. As 

such, the TOLADTM MFA-10A formula should be acceptable for submission to the EPA for 

modification of the existing waiver.
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Disclaimer of Liability: Baker Petrolite Corporation and its affiliates (BPC) disclaim all warranties or representations express or implied, 

including any implied warranties of merchantability or fitness for a particular purpose or to the accuracy, correctness or completeness of such 

information herein or that reliance on such information will accomplish any particular result. All such information is furnished “as is” and by 

using such information the user is assuming all liabilities for the use or reliance on such information. BPC SHALL NOT BE LIABLE FOR ANY 

INDIRECT, SPECIAL, PUNITIVE, EXEMPLARY OR CONSEQUENTIAL DAMAGES OR LOSSES FROM ANY CAUSE WHATSOEVER 

INCLUDING BUT NOT LIMITED TO ITS NEGLIGENCE.

.

Figure 1 Photo of Test Spindle in Untreated Fuel (“Octamix”) vs. “Octamix” Treated with 

TOLADTM MFA-10 and TOLADTM MFA-10A

Table 4 Physical Properties of TOLADTM MFA-10A

Viscosity @ 100oF (cSt) 17.5

Viscosity @ 32oF (cSt) 92.7

Viscosity @ 0oF (cSt) 294.2

Specific Gravity, 60oF 0.9144

Ash Content (wt%) 0.02

Flash Point, PMCC (oF) 98

Appearance Clear, dark amber liquid

Treat Level (minimum) 25 ppm

Treat Level (average) 50 ppm

Treat Level (maximum) 300 ppm

Untreated

Treated with 

TOLADTM MFA-10

Treated with 

TOLADTM MFA-10A