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




Surface Solutions Laboratory

Trial Report



Trial Number 5

(Client Number 244, Project Number 1)

Trial Purpose: To evaluate abrasion resistance for various floor finishes

Date Run: 06/02/05

Experiment Procedure:
Control of Moisture Content and Temperature
The moisture content at the time of testing will influence results due to the hydroscopic nature of the base materials. Therefore, efforts must be taken to ensure that the moisture content and temperature remain constant during the evaluation period. Ideally, the sample floor should be kept at 65+/-1% relative humidity and 68+/-6 F.

During laboratory testing, conditions were slightly drier, 40% relative humidity, but the temperature was within the given temperature range ~70 F).

Sample Preparation
The flooring material supplied was Hardwood flooring made from Red Oak. The boards were ?? thick, 2 ?? wide and cut into 8? sections. Some pieces of the flooring had to be sanded prior to making initial thickness readings to remove residual packing tape adhesive. With the boards cut into 8? coupons, three readings were made using a Brown & Sharpe Micrometer to measure each coupons initial board thickness. Each reading was made to 0.001? and the three values were averaged to give a baseline thickness for the coupons. In addition to the thickness baseline, baselines were established for Gloss, Coefficient of Friction, Impact, Small Area Loads. Procedures for each baseline measurements followed the procedures to be outlined.

Following the establishment of the baselines, three coupons were coated with a supplied floor finish according to the manufacturers? specifications. The finish was applied using a 1? Pure Bristle 1500 paint brush. To ensure consistent coating application, the finish was leveled off using a 10 mils Precision Gage & Tool Co Dow Film Caster. Three coats were used for each floor finish as this was common number of coating layers suggested by the various manufacturers. Each coating layer was allowed to dry for 2 hours prior to the application of the next coat. Completed coupons were allowed to sit for a minimum period of 24 hours before performance evaluations were conducted.

Abrasion Resistance
The methodology used for this experiment uses little from the ASTM standard. The 80 grit aluminum oxide was used as sandpaper, the testing went for two, 100 cycles and the Navy-type Wear Tester instrument was replaced with the BYK Gardner Abrasion Tester (Figure 1).

Figure 1. Abrasion Tester Apparatus

Coupons were placed into the Abrasion tester and subjected to the 100 cycles with the 80 grit sandpaper. At the end of the first cycle, the coupons were wiped with a dry sponge to remove any dust that was generated. Three thickness measurements were made and recorded to determine the decrease in surface thickness. The coupon was then subjected to the second 100 revolutions with the sandpaper. Measurements were made in the same manner as the first set. Averages for both sets were calculated and compared to the other floor finishes.

Trial Results
Product ID  Products Tested:
2           Capitol Polyurethane Gloss
3           Pro Finisher Water Based Polyurethane for floors
4           Pro Finisher Water Based Sanding Sealer
5           Quide SA Aqua Deva Metro

Coupon Thickness Prior to Abrasion Testing
Initial                                               Coated                              Initial   
                                                                                          Coating
Product  Coupon Mid    End 1  End 2  Ave    Prod Ave  Mid    End 1  End 2  Ave   Prod Ave Thickness   
2        52     7.469  7.485  7.452  7.469  7.349     7.495  7.548  7.500  7.514  7.401     0.052
         53     7.273  7.325  7.417  7.338            7.419  7.363  7.457  7.413          
         54     7.260  7.199  7.261  7.240            7.320  7.210  7.300  7.277          
3        55     7.435  7.452  7.388  7.425  7.437     7.475  7.480  7.403  7.453  7.480     0.043
         56     7.491  7.468  7.326  7.428            7.506  7.480  7.482  7.489          
         57     7.462  7.469  7.438  7.456            7.487  7.517  7.487  7.497          
4        58     7.437  7.464  7.436  7.446  7.388     7.507  7.485  7.532  7.508  7.443     0.055
         59     7.450  7.481  7.456  7.462            7.472  7.516  7.494  7.494          
         60     7.346  7.316  7.104  7.255            7.350  7.463  7.170  7.328          
5        61     7.460  7.477  7.467  7.468  7.470     7.477  7.510  7.494  7.494  7.505     0.034
         62     7.537  7.550  7.586  7.558            7.540  7.568  7.596  7.568          
         63     7.373  7.347  7.436  7.385            7.544  7.372  7.442  7.453          

Coupon Thickness After Abrasion Testing
Product  Coupon Mid    End 1  End 2  Ave    Ave Prod Final Coat - Cycle
Cycle 1
2        52     7.513  7.498  7.482  7.498  7.368          0.017     
         53     7.421  7.372  7.314  7.369                 0.044     
         54     7.223  7.226  7.265  7.238                 0.039     
3        55     7.456  7.430  7.323  7.403   7.446         0.050     
         56     7.464  7.456  7.457  7.459                 0.030     
         57     7.475  7.481  7.472  7.476                 0.021     
4        58     7.451  7.470  7.468  7.463   7.410         0.045     
         59     7.490  7.498  7.463  7.484                 0.010     
         60     7.356  7.430  7.061  7.282                 0.045     
5        61     7.466  7.501  7.474  7.480   7.451         0.013     
         62     7.469  7.489  7.471  7.476                 0.092     
         63     7.426  7.352  7.410  7.396                 0.057     

Cycle 2
2        52     7.494  7.514  7.483  7.497   7.372         0.017     
         53     7.353  7.354  7.415  7.374                 0.039     
         54     7.215  7.223  7.300  7.246                 0.031     
3        55     7.441  7.440  7.316  7.399   7.441         0.054     
         56     7.460  7.459  7.455  7.458                 0.031     
         57     7.465  7.477  7.458  7.467                 0.030     
4        58     7.456  7.462  7.465  7.461   7.396         0.047     
         59     7.451  7.488  7.463  7.467                 0.027     
         60     7.340  7.421  7.020  7.260                 0.067     
5        61     7.464  7.494  7.483  7.480   7.445         0.013     
         62     7.463  7.476  7.489  7.476                 0.092     
         63     7.392  7.339  7.401  7.377                 0.075     

Cumulative Coating Losses
                    Coating Loss
Product             Cycle 1    Cycle 2
Polyurethane Gloss  0.033      0.029 
WB Polyurethane     0.034      0.038 
WB Sanding Sealer   0.034      0.047 
Aqua Deva Metro     0.054      0.060 
Uncoated            0.052      0.033

Figure 2 compares coating losses visually.


Success Rating
A cleanliness study, addressing only various analytical techniques.

Conclusion
All the products tested showed loss in coating thickness after 100 passes of the 80 grit sand paper. The subsequent 100 passes had less impact on thickness than the first 100 passes did.