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Trial Report
Trial Number 13(Client Number 244, Project Number 1) |
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Trial Purpose: To determine the coefficient of friction for additional floor finishes. Date Run: 06/24/05 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. Coefficient of Friction The ASTM specified apparatus was replaced with an IMASS, Inc SP-102B-3M90 Slip/Peel Tester (Figure 1). Two types of friction coefficients were measured using this instrument. The first, Static CoF, was determined by obtaining the force required to move the specimen from a stationary position. The second, Sliding CoF (or Kinetic), was found by measuring the average force required to maintain movement at a certain rate. Measured forces will have peaks and valleys in the amount of force needed to keep moving. Average these values results and dividing by the weight of the object will result in the desired coefficient. Figure 1. IMASS Slip/Peel Tester The Slip/Peel tester was first adjusted to ensure that the device was properly calibrated for the sled weight being used. A coupon was then placed and clamped onto the bed of the device. The speed of the bed was set to 45?/min. The instrument records two values, the peak, the valley and calculates the average. The device was run three times per coupon for measuring the Static CoF and three times to measure the Kinetic CoF. Each coupon?s value was averaged and then the values for each finish (three coupon averages) were averaged to get one value for the Static Coefficient of Friction and one value for the Kinetic Coefficient of Friction. These values for coated samples were compared to the CoF for the same uncoated coupons. Coefficient of Friction = Ratio of tractive (pulling) force to the normal force (sled weight): CoF = F/N = (Tractive force)/(Normal Force) = (meter reading)/(sled weight) Trial Results Product ID Products Tested:
1 Hydro 202 Satin
6 SafeCoat Satin
7 SafeCoat Gloss
Uncoated CoF Readings
Static Kinetic
Product Coupon Peak Valley Ave Peak Valley Ave
1 49 706 515 524 561 502 516
656 496 502 524 456 487
721 493 498 533 476 485
50 781 499 532 535 489 512
681 498 519 531 485 512
688 497 515 525 491 506
51 715 532 533 551 536 542
745 515 524 551 529 540
775 517 522 555 537 536
6 2 838 607 648 645 580 609
734 586 629 642 587 622
759 588 627 654 577 612
3 833 612 619 627 590 597
798 578 593 594 578 584
813 577 590 600 568 583
4 729 536 553 577 525 533
697 506 530 558 513 525
748 530 538 564 516 529
7 11 777 538 624 647 538 614
769 528 613 642 545 616
807 542 610 639 541 614
12 869 619 647 636 587 610
880 605 626 636 574 604
864 581 623 636 574 604
13 771 548 566 563 526 537
698 551 562 551 520 528
744 536 561 554 521 538
Averages Static Kinetic
Product Peak Valley Average Peak Valley Average
1 694 501 508 539 478 496
717 498 522 530 488 510
745 521 526 552 534 539
Product Ave 719 507 519 541 500 515
6 777 594 635 647 581 614
815 589 601 607 579 588
482 345 356 374 343 351
Product Ave 691 509 530 543 501 518
7 784 536 616 643 541 615
871 602 632 636 578 606
481 362 374 368 347 355
Product Ave 712 500 541 549 489 525
Coated CoF Readings
Static Kinetic
Product Coupon Peak Valley Average Peak Valley Average
1 49 859 636 677 807 664 723
891 667 694 821 678 728
833 695 710 794 669 729
50 1485 1024 1169 1228 986 1097
1261 1001 1126 1172 979 1084
1212 969 1097 1178 956 1079
51 1021 765 877 996 869 947
1000 895 934 1100 928 1019
1037 891 965 1062 916 1000
6 2 829 603 628 646 571 589
750 502 621 804 582 607
813 434 620 658 572 599
3 827 578 620 624 557 593
858 577 604 613 565 593
935 574 601 618 587 590
4 936 571 613 625 550 581
885 554 589 657 544 574
812 547 584 664 545 571
7 11 1036 605 749 940 619 759
834 708 735 855 604 761
1046 728 761 975 736 761
12 988 569 783 1067 631 800
1184 553 789 1065 657 797
1227 564 789 1047 779 801
13 920 577 714 977 582 730
1031 634 720 995 613 740
892 493 735 743 698 720
Averages Static Kinetic
Product Peak Valley Average Peak Valley Average
Hydro 202 Satin 861 666 694 807 670 727
1319 998 1131 1193 974 1087
1019 850 925 1053 904 989
1067 838 917 1018 849 934
SafeCoat Satin 797 513 623 703 575 598
873 576 608 618 570 592
878 557 595 649 546 575
849 549 609 657 564 589
SafeCoat Gloss 972 680 748 923 653 760
1133 562 787 1060 689 799
948 568 723 905 631 730
1018 603 753 963 658 763Success Rating A cleanliness study, addressing only various analytical techniques. Conclusion Both SafeCoat BP Gloss and Capitol Hydro 202 Satin had substantial increases to the static and Kinetic CoFs. These increase were similar to the increase for the Pro Finisher Water Based Polyurethane from the previous trial. |