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Trial Number 4

Trial Purpose:

To evaluate rolling load resistance for various floor finishes

Date Run:

06/30/2006

Experiment Procedure:

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 measured at 64% relative humidity, and the temperature was 74.8 F).

The flooring material supplied was Hardwood flooring made from Red Oak. The boards were ¾” thick, 2 ¼” wide and cut into 8” sections.

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 proper coating application rates, the coatings were applied via pipettes to surface. Three coats were used for each floor finish as this was common number of coating layers suggested by the various manufacturers.

The first two coatings were allowed to dry for 2 hours prior to the application of the next coat. The second coat for the current process was allowed to dry overnight before the application of final coat. The Completed coupons were allowed to sit for a minimum period of 24 hours before performance evaluations were conducted.

Rolling Load
Measurements made during the rolling load will reveal damage to the coupon surface from repeated rolling forces, simulating heavy castored loads such as beds, desks and appliances. Coupons were placed into a holding device and clamped to restrict movement of the coupon. A load sled was constructed using a wood plank and three castor wheels. The round, hard wheels were 2” in diameter and 1” wide. The sled was loaded with 200 pounds. Figure 3 shows the sled passing over the surface of the finished coupon.

Figure 3. Rolling Load Apparatus
Ten passes (5 cycles) were completed and the three measurements were made along the path of the sled wheel. An additional 15 passes were made with three more measurements made. Following the 25 passes, another 25 passes were made with the deformation measurements. The averages for the three sets of passes were calculated. Any notable surface changes were recorded. The results for each floor finish were compared to the other finishes.

Trial Results:

Rolling Load Resistance

Coating Coupon # passes Middle End 1 End 2 Ave Microm Middle End 1 End 2 Ave Microm
CP 46 10 0.7634 0.7602 0.7646 0.7627 0.7564 0.7486 0.7572 0.7541
    25         0.7536 0.7469 0.7524 0.7510
    50         0.7501 0.7426 0.7513 0.7480
  47 10 0.7647 0.7642 0.7645 0.7645 0.7498 0.7596 0.7570 0.7555
    25         0.7472 0.7501 0.7509 0.7494
    50         0.7452 0.7497 0.7487 0.7479
  48 10 0.7550 0.7551 0.7550 0.7550 0.7524 0.7532 0.7507 0.7521
    25         0.7496 0.7517 0.7504 0.7506
    50         0.7513 0.7497 0.7494 0.7501
MCP 49 10 0.7663 0.7676 0.7601 0.7647 0.7527 0.7609 0.7552 0.7563
    25         0.7500 0.7573 0.7531 0.7535
    50         0.7499 0.7567 0.7517 0.7528
  50 10 0.7574 0.7604 0.7632 0.7603 0.7567 0.7540 0.7581 0.7563
    25         0.7552 0.7535 0.7581 0.7556
    50         0.7510 0.7522 0.7578 0.7537
  51 10 0.7626 0.7647 0.7628 0.7634 0.7580 0.7613 0.7600 0.7598
    25         0.7550 0.7606 0.7523 0.7560
    50         0.7521 0.7591 0.7577 0.7563
BO 52 10 0.7663 0.7638 0.7647 0.7649 0.7607 0.7592 0.7606 0.7602
    25         0.7591 0.7576 0.7566 0.7578
    50         0.7573 0.7565 0.7556 0.7565
  53 10 0.7599 0.7607 0.7607 0.7604 0.7557 0.7565 0.7578 0.7567
    25         0.7525 0.7547 0.7566 0.7546
    50         0.7512 0.7533 0.7562 0.7536
  54 10 0.7569 0.7598 0.7644 0.7604 0.7464 0.7526 0.7571 0.7520
    25         0.7449 0.7500 0.7544 0.7498
    50         0.7441 0.7479 0.7532 0.7484
BW 55 10 0.7684 0.7610 0.7680 0.7658 0.7507 0.7516 0.7525 0.7516
    25         0.7497 0.7504 0.7510 0.7504
    50         0.7494 0.7500 0.7509 0.7501
  56 10 0.7684 0.7600 0.7656 0.7647 0.7592 0.7558 0.7548 0.7566
    25         0.7552 0.7523 0.7506 0.7527
    50         0.7550 0.7512 0.7498 0.7520
  57 10 0.7671 0.7710 0.7642 0.7674 0.7576 0.7580 0.7599 0.7585
    25         0.7550 0.7574 0.7590 0.7571
    50         0.7539 0.7563 0.7589 0.7564

Summary Rolling Load Resistance

Floor Coating 10 25 50 Total Depression Depth Rank
CP 0.0089 0.0036 0.0016 0.0141 4
MCP 0.0072 0.0024 0.0008 0.0104 1
BO 0.0086 0.0022 0.0012 0.0121 2
BW 0.0102 0.0022 0.0006 0.0130 3
Pro Finisher Water Based Sanding Sealer & Polyurethane
  0.0041 0.0058 0.0084 0.0084  

Success Rating:

A cleanliness study, addressing only various analytical techniques.

Conclusion:

The modified current practice resulted in the best resistance to the rolling load followed by the Bona Oil mix, then the Bona Water mix and lastly by the current practice.

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