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Toxics Use Reduction Institute · Surface Solutions Laboratory
Toxics Use Reduction Institute

Surface Solutions Laboratory

Trial Report

Trial Number 26

(Client Number 275, Project Number 1)

Trial Purpose: To evaluate carpet resoiling characteristics of supplied cleaning product for GS 37 certification

Date Run: 05/05/10

Experiment Procedure:
Carpet pieces that were previously soiled and cleaned with the supplied product and Liquid Formula 90 (industry standard product) were resoiled by placing the carpet sections into the 1-gallon can, making sure the carpet lined the inner wall of the can. Nalgene? tubing cut into 1/8" pieces were poured into the bucket and 2 grams of the AATCC soil was distributed along the width of the can. The can was lidded and placed into a harness attached to a crank shaft. The crank was turned at an average rate of 42 rpm by hand for 5 minutes in one direction, followed by 5 minutes of rotation in the opposite direction. At the end of the 10-minute soiling regime, the carpet was placed onto a carpet template and vacuumed with a Eureka SuperBroom (Brush-Up, Motor-Driven/Brush-Roll) vacuum for 5 strokes in the forward direction followed by the same number of strokes in the backward direction. The carpet pieces were evaluated again using a BYK specro-guide gloss color meter was used to measure L-values from the surface of the carpet.

Trial Results
The two dilutions of PC 120 both dilutions had better resoiling characteristics as shown by the higher light meter readings and the lower difference
in final L value and extraction L values. The PC 220 at the 1:64 dilution had similar results to the industry comparative product. All products and
dilutions worked better than water alone. The table list the L-value reading for each section of carpet before resoiling and after vacuuming.

Cleaner Part  Extraction Ave E  Resoil  Ave R   Difference
Chemspec Liquid 90 1:640
        A        72.65   72.05  54.49   55.72    16.33
        B        74.73          59.17                
        C        68.77          53.51                
MD Steston PC 120 1:64
        A        75.67   72.30  57.43   59.22    13.08
        B        71.95          57.38                
        C        69.27          62.84                
MD Steston PC 120 1:128
        A        72.14   69.78  58.34   56.49   13.29
        B        65.96          53.30                
        C        71.24          57.82                
MD Steston PC 220 1:64 
        A        73.95   73.92  59.53   56.57   17.35
        B        73.09          52.20                
        C        74.71          57.98                
MD Steston PC 220 1:128
        A        74.41   70.08  47.76   51.70   18.39
        B        66.37          50.63                
        C        69.47          56.70                
        A        70.85   70.00  59.79   51.17   18.83
        B        71.26          44.31                
        C        67.88          49.40

Success Rating
A follow up test, usually based on company input.

The PC 120 at 1:64 and 1:28 and the PC 220 were better than or comparable to the conventional non-green product for resoiling.