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Trial Number 1

Client Number 314

Project Number 1

Trial Purpose:

To evaluate second supplied product for Green Seal GS 34 degreasing standard.

Date Run:

12/16/2008

Experiment Procedure:

Two types of soils were prepared individually. The first soil, maintenance soil, consisted of 10 grams of carbon black, 10 grams iron oxide, 100 ml WD-40, 100 ml hydraulic oil, and 100 ml gear oil. Each component was placed in a 750 beaker and mixed for 20 minutes at room temperature using a magnetic stirrer. The second soil, production soil, was made by mixing 200 ml Quench Oil and 200 ml cutting oil for 20 minutes at room temperature using a magnetic stirrer in a second 750 ml beaker.

Approximately 100 mg of each soil was applied to a precleaned and preweighed stainless steel coupon onto one side only with a handheld swab. No soil was applied to the two control coupons. The maintenance soil for all three coupons was baked in an oven for 30 minutes at a temperature of 40° C (105 F). For the production soil, all three coupons were baked in an oven for thirty minutes at 105° C (220 F). The coupons were then allowed to cool to room temperature and weigh a second time (soiled mass = B).

One cleaning product was diluted to 34:1 (~2.9%). The solution was preheated to 40 C (105 F). Four 600 mL beakers were filled with enough fresh degreaser solution to completely submerge the coupons in the degreasing solution without any overflow. The four beakers were suspended in the heated tank and allowing the temperature in the cleaning bath and beakers to equilibrate.

Each coupon was suspended in a beaker, allowing the entire contaminated surface to be submerged in the cleaning solution. The coupons were washed for 20 minutes using immersion cleaning only.

The washing was followed by two rinse steps. The coupons were drained for 30 seconds prior to each rinse step. For each rinse step a 20 minute soak was utilized. After the two rinse steps, all coupons were first allowed to air dry for 30 minutes and then dried in an oven at 105° C for 30 minutes. The coupons were then cooled to room temperature and final weights were measured (mass of the coupon after cleaning = C).

The control coupons were examined to determine if there were any visible signs of corrosion. Next, the control coupon was weighed to determine if there was any lost mass, which might occur if corrosion was in progress; or gained mass, which might occur if the degreaser had left a residue on the coupons. The following equation was applied:
[MCC - MCB] < 0.1 mg (which is the maximum balance error).
Where:
MCC = mass of the control coupon after washing and rinsing
MCB = mass of the control coupon before washing and rinsing

For the cleaned coupons, the amount of residual soil per surface area was calculated, using the following formula:
RS = (C-A)/ Ar
Where:
RS = amount of residual soil (mg/m2)
C = mass of the coupon after cleaning
A = initial coupon mass
Ar = surface area = 0.0035 m2

If the average residual maintenance soil loading, and the average residual performance soil loading are each less than 2,000 mg/m2, the degreaser meets the cleaning performance criteria.

Trial Results:

The supplied cleaning product was not successful at removing the Maintenance soil using immersion cleaning at 105F. However, the Process soil cleaning had residual soil levels under the 2000 mg/m2 level. Efficiencies were calculated to be in the table lists the weights of the coupons and the calculated RS values.

IMC 300 Degreaser - 2.9%

Coupon Initial mass of coupons -g (A) Mass of coupon after - g soiling (B) Mass of coupon after - g cleaning (C) Residual soil (mg/m2)  Mass difference control (mg)
M1 63.8123 63.9152 63.8819 17400 -
M2 62.8384 62.9395 62.9091 17675 -
M3 62.726 62.8273 62.8077 20425 -
MC   61.3433 61.3434 - 0.1000
Average       18500  
P1 62.7543 62.8578 62.7578 875 -
P2 59.2946 59.3844 59.2956 250 -
P3 62.6879 62.7829 62.6924 1125 -
PC   63.0345 63.0345 - 0.0000
Average       750  

Success Rating:

A follow up test, usually based on company input.

Conclusion:

The supplied cleaning product was not success on both of the two soils and the average removal rate (9625 mg/m2) was not under the Green Seal GS 34 requirement of 2000 mg/m2 using immersion cleaning. The same product can be re-evaluated for cleaning using ultrasonic cleaning in an attempt to achieve the GS 34 requirement for cleaning.

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