The wind turbine blades (WTB) that face end -of-life was first mechanically milled and classified through a range of varying screen sizes. We then blended this with high density polyethylene (HDPE) thermoplastic resin and extruded it to a profiled composite. We determined the influence of refined particle size, resin content and coupling agents (maleic anhydride polyethylene (MAPE) and methacryloxypropyltriethoxysilane (Silane)) on the mechanical properties of recycled composites [1]. Keywords: Recycling, Wind turbine blade, Polymer -matrix composite, Glass fiber Value of the Data • Based on presented data, researchers could be referred to this dataset to design and analyze different experiments on rWTBs. • Presented dataset shows consistency among the samples and helps researcher to see the actual trend among these second -generation composites with different formulation. • Raw dataset presented on mechanical properties of rWTB composites helps other researcher in this field to understand the original condition of these second -generation composites. • Data on Mechanical properties of second -generation composites manufactured from rWTB materials gives the researchers clear vision about the potential utilization of these second -generation composites. 1. Data For obtaining mechanical properties of thermoplastic composites fabricated using recycled wind turbine blade materials, flexural tests were performed based on ASTM D790 -17. We determined the influence of refined particle size, resin content and coupling ag ents (maleic anhydride polyethylene (MAPE) and methacryloxypropyltriethoxysilane (Silane)) on the mechanical properties of recycled composites . 2. Experimental Design , Materials , and Methods 2.1 Materials Recycled wind turbine blade (rWTB) material was supplied by Global Fiberglass Solutions at an incoming moisture content of 1.25% and shipped to the Composites Materials and Engineering Center at Washington State University . A high -density polyethylene (HDPE ) (0.3 MFI) was obtained from a commercial vend er and used as the matrix for the second -generation extruded composite. The rWTB material was hammer -milled through 3.18, and 1.59 mm screen size (MSS) and particle size distribution of the refined material was performed with Ro -Tap sieve analysis procedur es [2]. A commercially available 60 -mesh pine (P. stobus) was used for baseline comparison to the rWTB filled extrudate. Methacryloxypropyltrimethoxysilane (Silane) (Gelest Inc.) and maleic anhydride polyethylene (MAPE) were used as the coupling agents [3]. Table 1. Extruded rWTB composite formulation Sample # Pine (40 mesh) (%) Pine (60 mech) (%) 3.18 mm MSS rWTB(%) 1.59 mm MSS rWTB (%) Talc (%) MAP (%) Silane (%) HDPE(%) 1 55 0 6 36 2 40 6 51 3 45 6 46 4 50 6 41 5 55 6 36 6 60 6 31 7 50 47 8 55 42 9 60 37 10 55 42 11 55 6 36 12 55 2 40 13 54.5 0.5 42 14 50 47 15 55 42 16 60 37 17 50 2 45 18 55 2 40 19 60 2 35 20 49.5 0.5 47 21 54.5 0.5 42 22 59.5 0.5 37 23 13.75 41.25 42 24 27.5 27.5 42 25 41.25 13.75 42 26 65 2 30 27 70 2 25 28 65 32 29 70 27 2.2 Extruded rWTB composite preparation The various milled size fractions of rWTB material were mixed with high density polyethylene, non - metallic stearate lubricant, MAPE and silane as coupling agents were also added to the formulation. Silane was received in a liquid form and sprayed to rWTB materials. They were then blended for 15 minutes and dried for 10 hours at 60 C in an oven [ 4]. MAPE was added to the dry blend as a pellet. For comparison purposes, a commercial 60 -mesh pine was used as a feedstock source. Mechanical tests were performed based on ASTM D790 -17 [5]. 2.3 Mechanical properties of extruded rWTB composites The mechanical properties of the extruded composites were obtained from flexural tests. To evaluate the influence of MSS on the mechanical properties, milled material from 3.18 and 1.59 mm MSS was chosen. data show that decreasing MSS decreased both modulus of elasticity (MOE) and modulus of rupture (MOR) while the strain at break (SB) remained consistent as shown in Table 1 . While MSS had a slightly significant influence on the MOE, it did not have a significant influence on MOR and SB. When the level of rWTB was changed, all of the mechanical properties varied significantly as well. Addition of more rWTB to the mix increased the MOE and lowered the SB, while the MOR remained constant. Table 2: physica l properties of each specimen prepared for Flexural test. Average (In) Sample # Depth (In) Width (In) Depth Width 1-1 0.3815 0.385 0.3885 1.498 1.486 1.489 0.385 1.491 1-2 0.378 0.371 0.373 1.4905 1.4755 1.4835 0.374 1.483 1-3 0.373 0.369 0.371 1.483 1.4815 1.4815 0.371 1.482 1-4 0.376 0.375 0.3735 1.484 1.487 1.485 0.374 1.485 1-5 0.3735 0.374 0.3765 1.4815 1.4815 1.4855 0.374 1.482 1-6 0.374 0.369 0.3715 1.488 1.482 1.4855 0.371 1.485 3--1 0.45 0.457 0.442 1.5075 1.5185 1.523 0.449 1.516 3--2 0.452 0.465 0.463 1.502 1.5415 1.531 0.460 1.524 3--3 0.433 0.434 0.431 1.505 1.501 1.498 0.432 1.501 3--4 0.423 0.428 0.4295 1.48 1.4885 1.503 0.426 1.490 3--5 0.44 0.4555 0.4495 1.492 1.5085 1.517 0.448 1.505 3--6 0.4255 0.427 0.434 1.492 1.485 1.489 0.428 1.488 4-1 0.4385 0.428 0.4235 1.5095 1.5005 1.499 0.43 1.503 4-2 0.423 0.4265 0.4255 1.49 1.498 1.5105 0.425 1.4995 4-3 0.442 0.445 0.4515 1.5145 1.5065 1.517 0.446 1.512 4-4 0.4285 0.4195 0.4225 1.5005 1.4965 1.4915 0.423 1.496 4-5 0.434 0.4365 0.4375 1.512 1.5125 1.5105 0.436 1.511 4-6 0.4375 0.437 0.4475 1.5025 1.51 1.5125 0.440 1.508 5-1 0.3965 0.395 0.3955 1.4815 1.48 1.481 0.395 1.480 5-2 0.3985 0.391 0.3935 1.4755 1.476 1.4785 0.394 1.476 5-3 0.3995 0.39 0.388 1.478 1.4795 1.4745 0.392 1.477 5-4 0.4 0.4005 0.3955 1.491 1.4815 1.4865 0.398 1.486 5-5 0.401 0.398 0.3955 1.492 1.4845 1.479 0.398 1.485 5-6 0.398 0.3955 0.3935 1.482 1.4705 1.471 0.395 1.474 6-1 0.3875 0.3885 0.389 1.4855 1.4805 1.481 0.388 1.482 6-2 0.389 0.3935 0.392 1.4985 1.4865 1.479 0.391 1.488 6-3 0.392 0.387 0.387 1.494 1.4805 1.4825 0.388 1.485 6-4 0.391 0.389 0.387 1.477 1.4725 1.4725 0.389 1.474 6-5 0.3915 0.392 0.389 1.4755 1.4755 1.469 0.390 1.473 6-6 0.391 0.3925 0.39 1.478 1.4815 1.484 0.391 1.481 7-1 0.412 0.414 0.4035 1.485 1.477 1.477 0.409 1.479 7-2 0.404 0.419 0.4115 1.4765 1.464 1.475 0.411 1.471 7-3 0.411 0.4085 0.4145 1.473 1.471 1.4815 0.411 1.475 7-4 0.419 0.418 0.408 1.481 1.482 1.4845 0.415 1.482 7-5 0.399 0.4145 0.412 1.486 1.4705 1.4765 0.408 1.477 7-6 0.414 0.415 0.418 1.4945 1.4855 1.4955 0.415 1.491 8-1 0.399 0.41 0.402 1.479 1.482 1.4825 0.401 1.481 8-2 0.3995 0.4055 0.406 1.466 1.467 1.467 0.403 1.466 8-3 0.4 0.4015 0.3965 1.4995 1.481 1.483 0.399 1.487 8-4 0.4035 0.406 0.399 1.483 1.469 1.4525 0.402 1.468 8-5 0.399 0.398 0.3995 1.4715 1.4685 1.473 0.398 1.471 8-6 0.4015 0.396 0.403 1.493 1.4845 1.4885 0.400 1.488 9-1 0.396 0.3985 0.398 1.4995 1.4875 1.485 0.397 1.490 9-2 0.397 0.393 0.3935 1.492 1.491 1.494 0.394 1.492 9-3 0.403 0.3965 0.394 1.487 1.489 1.484 0.397 1.486 9-4 0.405 0.393 0.394 1.502 1.478 1.4795 0.397 1.486 9-5 0.412 0.4065 0.408 1.497 1.4905 1.502 0.408 1.496 9-6 0.401 0.3895 0.4 1.4935 1.462 1.4605 0.396 1.472 10-1 0.385 0.389 0.3855 1.479 1.477 1.478 0.386 1.478 10-2 0.389 0.3845 0.388 1.4835 1.478 1.473 0.387 1.478 10-3 0.395 0.3865 0.386 1.479 1.4785 1.4745 0.389 1.477 10-4 0.396 0.3885 0.3845 1.4755 1.4725 1.474 0.389 1.474 10-5 0.387 0.3865 0.391 1.485 1.48 1.474 0.388 1.479 10-6 0.387 0.39 0.3905 1.4745 1.4745 1.4745 0.389 1.474 11-1 0.39 0.382 0.384 1.483 1.4815 1.481 0.386 1.481 11-2 0.395 0.3835 0.3845 1.4805 1.48 1.48 0.387 1.480 11-3 0.392 0.381 0.385 1.49 1.481 1.483 0.386 1.484 11-4 0.394 0.382 0.383 1.483 1.481 1.479 0.389 1.481 11-5 0.3855 0.3825 0.3805 1.483 1.4805 1.479 0.382 1.480 11-6 0.385 0.3835 0.382 1.4825 1.485 1.431 0.383 1.466 12-1 0.3885 0.381 0.384 1.454 1.461 1.458 0.384 1.457 12-2 0.378 0.385 0.3895 1.4505 1.4405 1.444 0.384 1.445 12-3 0.385 0.38 0.399 1.4505 1.4505 1.444 0.388 1.448 12-4 0.3835 0.3795 0.3755 1.4745 1.473 1.47 0.379 1.472 12-5 0.3815 0.38 0.38 1.457 1.4705 1.46 0.380 1.462 12-6 0.376 0.38 0.378 1.464 1.4615 1.4625 0.378 1.46 14-1 0.424 0.442 0.4345 1.5105 1.502 1.4985 0.433 1.503 14-2 0.4385 0.436 0.437 1.504 1.501 1.51 0.4371 1.505 14-3 0.435 0.431 0.4295 1.4915 1.484 1.4835 0.431 1.486 14-4 0.438 0.443 0.438 1.4955 1.504 1.4995 0.439 1.499 14-5 0.4325 0.436 0.4395 1.5175 1.512 1.514 0.436 1.514 14-6 0.448 0.448 0.433 1.513 1.5015 1.5045 0.443 1.506 15-1 0.4185 0.4245 0.4275 1.479 1.4835 1.482 0.423 1.481 15-2 0.4335 0.4285 0.4215 1.47 1.475 1.475 0.429 1.473 15-3 0.437 0.445 0.446 1.5065 1.493 1.5055 0.444 1.501 15-4 0.425 0.4285 0.423 1.4925 1.4865 1.489 0.425 1.488 15-5 0.4235 0.4245 0.4315 1.4815 1.478 1.477 0.426 1.478 15-6 0.441 0.429 0.4285 1.4835 1.488 1.4735 0.4328 1.4816 16-1 0.4085 0.4085 0.406 1.482 1.4785 1.4805 0.407 1.488 16-2 0.408 0.4155 0.408 1.477 1.483 1.481 0.410 1.480 16-3 0.413 0.409 0.411 1.4845 1.4825 1.474 0.411 1.480 16-4 0.4085 0.412 0.408 1.481 1.471 1.469 0.409 1.473 16-5 0.409 0.4095 0.412 1.479 1.482 1.4755 0.410 1.479 16-6 0.4115 0.4085 0.417 1.483 1.483 1.4795 0.412 1.481 17-1 0.409 0.419 0.42 1.4705 1.471 1.4685 0.416 1.477 17-2 0.413 0.418 0.4095 1.4705 1.463 1.446 0.413 1.459 17-3 0.413 0.415 0.41 1.454 1.452 1.466 0.412 1.457 17-4 0.419 0.412 0.413 1.473 1.48 1.453 0.414 1.468 17-5 0.404 0.4045 0.4035 1.4705 1.463 1.472 0.404 1.468 17-6 0.42 0.4125 0.424 1.461 1.461 1.4605 0.418 1.460 18-1 0.404 0.404 0.406 1.454 1.464 1.451 0.404 1.45 18-2 0.402 0.401 0.403 1.444 1.4485 1.4455 0.402 1.446 18-3 0.4035 0.4065 0.4045 1.4505 1.4445 1.453 0.404 1.449 18-4 0.402 0.4045 0.391 1.46 1.4645 1.4425 0.399 1.455 18-5 0.397 0.3945 0.3925 1.457 1.455 1.4535 0.394 1.455 18-6 0.411 0.409 0.411 1.4695 1.462 1.4655 0.410 1.465 19-1 0.389 0.385 0.3885 1.4455 1.449 1.441 0.387 1.445 19-2 0.384 0.385 0.388 1.452 1.457 1.456 0.385 1.455 19-3 0.394 0.39 0.392 1.46 1.463 1.461 0.392 1.461 19-4 0.392 0.392 0.3865 1.46 1.468 1.468 0.390 1.465 19-5 0.391 0.3885 0.3865 1.4615 1.4505 1.448 0.388 1.453 19-6 0.395 0.3935 0.391 1.4675 1.466 1.466 0.393 1.466 13-1 0.3765 0.375 0.378 1.485 1.482 1.4825 0.376 1.483 13-2 0.38 0.379 0.378 1.487 1.4835 1.4805 0.379 1.483 13-3 0.3805 0.379 0.3805 1.485 1.485 1.483 0.388 1.484 13-4 0.387 0.387 0.383 1.491 1.488 1.4795 0.385 1.486 13-5 0.3885 0.387 0.391 1.485 1.486 1.4815 0.388 1.484 13-6 0.387 0.3945 0.391 1.4815 1.488 1.483 0.390 1.489 20-1 0.4565 0.4445 0.437 1.5105 1.501 1.5005 0.446 1.504 20-2 0.436 0.454 0.4395 1.4985 1.4945 1.497 0.443 1.496 20-3 0.447 0.446 0.434 1.489 1.49 1.494 0.442 1.491 20-4 0.4525 0.446 0.452 1.4935 1.489 1.503 0.450 1.495 20-5 0.4675 0.446 0.431 1.502 1.5015 1.506 0.448 1.506 20-6 0.45 0.445 0.4515 1.499 1.5065 1.504 0.448 1.503 21-1 0.442 0.4185 0.4205 1.4785 1.473 1.4735 0.427 1.475 21-2 0.4145 0.4245 0.4005 1.477 1.48 1.477 0.413 1.478 21-3 0.405 0.4085 0.411 1.481 1.477 1.4785 0.408 1.478 21-4 0.409 0.412 0.4205 1.481 1.4785 1.4795 0.413 1.479 21-5 0.4135 0.409 0.404 1.485 1.4805 1.474 0.408 1.4798 21-6 0.3955 0.431 0.41 1.478 1.481 1.48 0.412 1.4796 22-1 0.3945 0.3935 0.389 1.4775 1.476 1.4785 0.392 1.477 22-2 0.392 0.389 0.3835 1.479 1.4875 1.479 0.388 1.481 22-3 0.394 0.39 0.396 1.4805 1.4755 1.477 0.393 1.477 22-4 0.392 0.3825 0.381 1.4835 1.475 1.484 0.385 1.480 22-5 0.3815 0.391 0.388 1.477 1.4755 1.48 0.386 1.477 22-6 0.39 0.3905 0.3985 1.4775 1.4745 1.479 0.393 1.477 23-1 0.393 0.393 0.387 1.4755 1.473 1.473 0.391 1.473 23-2 0.3925 0.3895 0.3935 1.474 1.471 1.4745 0.391 1.473 23-3 0.3895 0.389 0.387 1.479 1.4765 1.4775 0.388 1.477 23-4 0.391 0.388 0.388 1.4825 1.4765 1.482 0.389 1.480 23-5 0.392 0.3875 0.392 1.48 1.478 1.482 0.3905 1.48 23-6 0.3865 0.392 0.3925 1.476 1.4775 1.481 0.390 1.478 24-1 0.389 0.385 0.3855 1.477 1.4755 1.4745 0.386 1.475 24-2 0.385 0.386 0.3845 1.474 1.4745 1.476 0.385 1.474 24-3 0.383 0.3855 0.3845 1.481 1.4775 1.479 0.384 1.479 24-4 0.386 0.386 0.386 1.4815 1.476 1.476 0.386 1.477 24-5 0.38 0.387 0.387 1.472 1.472 1.474 0.384 1.472 24-6 0.386 0.3845 0.385 1.477 1.4735 1.472 0.385 1.474 25-1 0.386 0.386 0.3845 1.477 1.4765 1.4775 0.385 1.477 25-2 0.3835 0.3825 0.3815 1.482 1.48 1.479 0.382 1.480 25-3 0.3805 0.38 0.3825 1.4825 1.489 1.4795 0.381 1.483 25-4 0.382 0.386 0.383 1.481 1.479 1.481 0.383 1.480 25-5 0.386 0.3785 0.386 1.4805 1.4725 1.4695 0.383 1.487 25-6 0.39 0.391 0.3875 1.48 1.4745 1.477 0.389 1.477 26-1 0.373 0.375 0.3805 1.4515 1.4595 1.4555 0.376 1.455 26-2 0.379 0.3825 0.3805 1.4665 1.46 1.456 0.380 1.460 26-3 0.3835 0.384 0.383 1.461 1.4625 1.466 0.3835 1.463 26-4 0.3765 0.3785 0.384 1.451 1.448 1.449 0.379 1.448 26-5 0.3765 0.381 0.379 1.458 1.4635 1.4545 0.378 1.458 26-6 0.379 0.382 0.387 1.462 1.461 1.4605 0.382 1.461 27-1 0.3695 0.3735 0.3675 1.4515 1.452 1.446 0.370 1.447 27-2 0.379 0.3655 0.37 1.4555 1.4525 1.4515 0.371 1.453 27-3 0.3735 0.37 0.3675 1.454 1.4565 1.453 0.370 1.454 27-4 0.3665 0.377 0.3715 1.4535 1.453 1.454 0.371 1.453 27-5 0.37 0.3675 0.3665 1.464 1.457 1.458 0.368 1.457 27-6 0.3695 0.3735 0.3745 1.465 1.463 1.4625 0.372 1.463 28-1 0.3845 0.3875 0.3805 1.481 1.478 1.476 0.384 1.478 28-2 0.3905 0.383 0.3865 1.4815 1.483 1.488 0.386 1.484 28-3 0.383 0.3815 0.3765 1.4695 1.4745 1.4795 0.380 1.474 28-4 0.3835 0.3845 0.382 1.477 1.476 1.4755 0.383 1.47 28-5 0.3775 0.3815 0.379 1.477 1.481 1.473 0.379 1.477 28-6 0.376 0.377 0.373 1.476 1.4755 1.479 0.375 1.476 29-1 0.38 0.3775 0.376 1.4795 1.4795 1.4885 0.377 1.482 29-2 0.3855 0.383 0.382 1.4875 1.4885 1.482 0.383 1.486 29-3 0.375 0.377 0.38 1.4845 1.483 1.488 0.377 1.485 29-4 0.381 0.388 0.3875 1.486 1.4835 1.492 0.385 1.487 29-5 0.377 0.379 0.377 1.483 1.4815 1.48 0.379 1.481 29-6 0.39 0.3905 0.3985 1.4775 1.4745 1.479 0.393 1.477 MAPE and silane are two common coupling agents that are used in the production of reinforced thermoplastic composites. Table 3 presents the mechanical properties of composites modified with MAPE and silane. As expected, the results indicate that MAPE had a significantly positive influence on MOE and MOR of the composite. When the rWTB content increased, the MAPE had a slightly st ronger influence on the MOE and MOR of the composite. The silane -based coupling agent showed limited improvement, and in some cases a reduction in the mechanical properties of composites at the lower rWTB levels. When the rWTB content increased, the influe nce of silane on MOE and MOR decreased. However, this effect was not significant. In addition, both the MAPE and silane reduced the SB of the composite. Because silane lacked performance, it was not used at higher level of rWTB content. As the rWTB level was increased to over 65%, there was a separation in behavior for the MAPE based composites. Results show that for the non -MAPE composites, increasing the rWTB content more than 65% decreased the MOE and MOR. However, MAPE had a significant influence on t he MOE and MOR of composites with a higher rWTB content. By increasing rWTB content to more than 65%, the difference in MOE and MOR between untreated composite and modified with MAPE composite was significant. For a 70% rWTB content, the MOE and MOR of the composite modified with MAPE was almost twice that of the untreated composite. The decreasing trend of SB with increasing rWTB showed a leveling -off or plateau after 65%. Table 3: flexural properties of rWTB composites. Sample Specimen Density (lb/ft3) MOE (Psi) MOR (Psi) Strain at break 1 1 66.5 304567.7 3231.804 0.0233567 2 69.7 343208.1 3505.698 0.0236243 3 70.3 330044.9 3380.67 0.0163448 4 68.8 286116.8 3586.546 0.0215225 5 69.5 281497.5 3327.194 0.0175193 6 69.6 313466.8 3668.125 0.0194976 Average for Sample 1 69.07165 309817 3450.006 0.0203109 Standard Dev for Sample 1 1.349893 24202.09 165.4225 0.0030301 Coefficient of Variation for Sample 1 1.95% 7.81% 4.79% 14.92% 3 1 69.0 308541.1 3401.682 0.0276958 2 68.5 306065.7 3452.762 0.0308106 3 70.2 321223.7 3704.978 0.0319467 4 70.2 305611.9 3647.846 0.0401398 5 69.0 299410.5 3496.801 0.028492 6 69.3 276882 3360.609 0.0408529 Average for Sample 3 69.39051 302955.8 3510.78 0.033323 Standard Dev for Sample 3 0.713198 14656.38 137.4883 0.0057685 Coefficient of Variation for Sample 3 1.03% 4.84% 3.92% 17.31% 4 1 72.8 362097 3800.943 0.0264318 2 72.0 355692.3 3611.169 0.0226378 3 71.0 349597.7 3825.238 0.0254042 4 72.9 374619.8 3916.847 0.0231283 5 72.3 350088.8 3741.625 0.0233838 6 71.1 335608.3 3660.137 0.02385 Average for Sample 4 72.02719 354617.3 3759.326 0.0241393 Standard Dev for Sample 4 0.821483 13147.22 112.2421 0.0014688 Coefficient of Variation for Sample 4 1.14% 3.71% 2.99% 6.08% 5 1 77.1 407256.3 3920.144 0.0161263 2 75.1 375962.4 3709.435 0.021672 3 75.7 384892.7 3629.383 0.0159973 4 76.3 375091.1 3749.674 0.0198154 5 74.9 342725.6 3497.443 0.0200733 6 75.1 357807.5 3544.593 0.0175873 Average for Sample 5 75.1 373955.9 3675.112 0.0185453 Standard Dev for Sample 5 0.847762 22225.86 153.278 0.0023232 Coefficient of Variation for Sample 5 1.13% 5.94% 4.17% 12.53% 6 1 80.2 429714.7 3863.973 0.0147796 2 79.1 409733.6 3656.425 0.0141218 3 79.2 382948.5 3559.357 0.0158962 4 77.8 386033.9 3469.042 0.012982 5 77.8 353509.5 3247.073 0.0133762 6 78.5 377348 3531.565 0.0156096 Average for Sample 6 78.76046 389881.4 3554.573 0.0144609 Standard Dev for Sample 6 0.943874 26546.84 204.2186 0.0011798 Coefficient of Variation for Sample 6 1.20% 6.81% 5.75% 8.16% 7 1 70.6 291661.8 3519.779 0.0323017 2 69.9 255131.4 3236.844 0.0362315 3 70.3 282118.8 3609.505 0.0342891 4 70.2 304974.3 3868.327 0.0386613 5 69.8 318574.4 3746.874 0.0339369 6 69.2 314786.3 3801.544 0.031994 Average For Sample 7 69.98004 294541.2 3630.479 0.0345691 Standard Dev For Sample 7 0.505225 23715.18 231.0952 0.0025203 Coefficient of Variation for Sample 7 0.72% 8.05% 6.37% 7.29% 8 1 71.1 324213.5 3483.48 0.024306 2 70.7 311916.9 3375.537 0.0312424 3 71.7 348652.7 3761.752 0.0264836 4 70.8 300857.7 3348.814 0.0267157 5 71.6 289232.5 3326.822 0.0253743 6 71.2 342701.5 3669.565 0.0225609 Average for Sample 8 71.18565 319595.8 3494.328 0.0261138 Standard Dev for Sample 8 0.410923 23373.11 182.0357 0.0029407 Coefficient of Variation for Sample 8 0.58% 7.31% 5.21% 11.26% 9 1 73.0 362227.3 3569.507 0.0208864 2 73.7 346902.1 3448.675 0.0205047 3 72.9 332385.5 3397.423 0.0202824 4 72.8 333415.3 3167.471 0.0203698 5 73.1 336302.5 3367.432 0.0201465 6 73.6 324021.2 3450.692 0.0211331 Average for Sample 9 73.1768 339209 3400.2 0.0205538 Standard Dev for Sample 9 0.40733 13477.89 133.273 0.00038 Coefficient of Variation for Sample 9 0.56% 3.97% 3.92% 1.85% 10 1 66.3 247309 3255 0.043 2 66.6 227202 2759 0.034 3 66.4 230768 2775 0.039 4 66.1 232621 2971 0.041 5 66.2 242181 3053 0.042 6 66.4 247159 3036 0.038 Average for Sample 9 66.33112 237873.3 2974.788 0.0395191 Standard Dev for Sample 9 0.154142 8783.503 187.0119 0.0033784 Coefficient of Variation for Sample 9 0.23% 3.69% 6.29% 8.55% 11 1 69.7 268850 3083 0.033 2 69.4 283206 2977 0.028 3 69.5 252420 2937 0.033 4 69.4 259069 2944 0.028 5 68.8 291998 3358 0.029 6 70.9 289147 3161 0.032 Average for Sample 9 69.59452 274114.9 3076.59 0.0302723 Standard Dev for Sample 9 0.687315 16451 163.2519 0.0024745 Coefficient of Variation for Sample 9 0.99% 6.00% 5.31% 8.17% 12 1 66.6 373882 4864 0.027 2 67.3 350489 4618 0.030 3 66.5 337832 4503 0.033 4 68.2 353776 4135 0.025 5 67.9 364422 4366 0.027 6 68.2 377435 4386 0.027 Average for Sample 9 67.42186 359639.4 4478.469 0.0283046 Standard Dev for Sample 9 0.781465 15073.72 248.1113 0.0029043 Coefficient of Variation for Sample 9 1.16% 4.19% 5.54% 10.26% 13 1 68.0 253234 3117 0.031 2 67.3 228548 3068 0.031 3 66.8 222482 2967 0.031 4 65.9 217166 2911 0.032 5 65.9 223025 3000 0.032 6 65.9 224845 2912 0.030 Average for Sample 9 66.60299 228216.7 2995.842 0.0312339 Standard Dev for Sample 9 0.89421 12800.89 83.85731 0.000677 Coefficient of Variation for Sample 9 1.34% 5.61% 2.80% 2.17% 14 1 68.7 281885 3516 0.032 2 68.3 284365 3617 0.036 3 69.5 287167 3630 0.040 4 68.4 276612 3525 0.037 5 69.0 283960 3630 0.040 6 67.8 254077 3062 0.029 Average for Sample 9 68.61325 278011 3496.669 0.035601 Standard Dev for Sample 9 0.586232 12242.43 219.3349 0.0044951 Coefficient of Variation for Sample 9 0.85% 4.40% 6.27% 12.63% 15 1 71.3 320421 3605 0.029 2 70.8 301256 3362 0.028 3 69.1 271862 3213 0.025 4 70.8 285917 3429 0.030 5 71.7 284026 3197 0.024 6 71.1 276940 3261 0.028 Average for Sample 9 70.79461 290070.3 3344.423 0.0272626 Standard Dev for Sample 9 0.916791 17910.97 155.7952 0.0022778 Coefficient of Variation for Sample 9 1.30% 6.17% 4.66% 8.35% 16 1 74.7 315250 3217 0.020 2 74.3 318137 3200 0.018 3 73.8 318249 3193 0.021 4 73.8 333512 3362 0.020 5 74.3 325278 3312 0.020 6 73.9 351404 3509 0.020 Average for Sample 9 74.12573 326971.8 3298.872 0.0195533 Standard Dev for Sample 9 0.342014 13668.4 123.3658 0.0009529 Coefficient of Variation for Sample 9 0.46% 4.18% 3.74% 4.87% 17 1 68.3 313737 4687 0.029 2 68.7 315917 4699 0.029 3 68.6 318432 4675 0.030 4 67.9 308634 4544 0.032 5 69.8 337378 4865 0.028 6 68.2 342063 4638 0.024 Average for Sample 9 68.57234 322693.4 4684.823 0.0286881 Standard Dev for Sample 9 0.661847 13658.72 104.6904 0.002599 Coefficient of Variation for Sample 9 0.97% 4.23% 2.23% 9.06% 18 1 71.5 370286 4853 0.023 2 72.3 369850 4740 0.021 3 71.8 356905 4819 0.024 4 71.7 370702 4935 0.024 5 72.6 395546 5080 0.023 6 71.3 362564 4816 0.024 Average for Sample 9 71.8598 370975.6 4873.862 0.0229549 Standard Dev for Sample 9 0.507577 13223.09 119.2369 0.0010593 Coefficient of Variation for Sample 9 0.71% 3.56% 2.45% 4.61% 19 1 75.2 442821 5050 0.017 2 75.3 452187 5361 0.019 3 74.3 452300 5362 0.018 4 74.7 449912 5472 0.019 5 74.5 447304 5209 0.017 6 73.9 428241 5045 0.018 Average for Sample 9 74.62356 445460.9 5250.078 0.0180697 Standard Dev for Sample 9 0.549032 9151.374 177.7501 0.0009402 Coefficient of Variation for Sample 9 0.74% 2.05% 3.39% 5.20% 20 1 63.7 185425 2747 0.040 2 63.8 194336 2798 0.038 3 63.3 193889 2747 0.035 4 62.9 187341 2751 0.039 5 62.8 198313 2906 0.040 6 63.5 176282 2581 0.036 Average for Sample 9 63.3409 189264.3 2755.039 0.0379585 Standard Dev for Sample 9 0.398893 7949.511 104.971 0.001967 Coefficient of Variation for Sample 9 0.63% 4.20% 3.81% 5.18% 21 1 67.6 264866 3054 0.026 2 69.1 289177 3143 0.021 3 70.1 298515 3238 0.021 4 69.4 287939 3128 0.021 5 69.6 289445 3132 0.022 6 69.2 283538 3157 0.023 Average for Sample 9 69.15271 285580 3142.15 0.0223883 Standard Dev for Sample 9 0.8401 11260.37 59.25396 0.0016925 Coefficient of Variation for Sample 9 1.21% 3.94% 1.89% 7.56% 22 1 73.8 341346 3299 0.015 2 74.5 356025 3411 0.014 3 73.4 345361 3258 0.015 4 74.6 361624 3255 0.014 5 74.5 356084 3329 0.015 6 73.4 401193 3233 0.015 Average for Sample 22 74.01528 360272.1 3297.656 0.0147444 Standard Dev for Sample 22 0.566825 21412.51 65.46746 0.0006242 Coefficient of Variation for Sample 22 0.77% 5.94% 1.99% 4.23% 23 1 71.4 282006 3531 0.027 2 71.3 304162 3490 0.027 3 71.9 304084 3465 0.025 4 71.7 293589 3435 0.027 5 71.7 310138 3484 0.023 6 71.9 309004 3610 0.034 Average for Sample 22 71.7 300497 3503 0.027 Standard Dev for Sample 22 0.3 10782 61 0.003 Coefficient of Variation for Sample 22 0.4% 3.6% 1.7% 12.8% 24 1 70.1 300777 3453 0.024 2 70.4 306160 3498 0.025 3 70.5 312452 3618 0.027 4 70.1 293275 3452 0.029 5 70.4 316206 3560 0.032 6 70.2 291270 3418 0.028 Average for Sample 22 70.3 303357 3500 0.027 Standard Dev for Sample 22 0.2 10100 76 0.003 Coefficient of Variation for Sample 22 0.2% 3.3% 2.2% 9.9% 25 1 68.3 283715 3432 0.029 2 68.6 286436 3490 0.033 3 68.6 270289 3245 0.030 4 68.5 279594 3291 0.028 5 68.7 267705 3284 0.032 6 67.8 290246 3506 0.032 Average for Sample 22 68.4 279664 3375 0.031 Standard Dev for Sample 22 0.3 9002 115 0.002 Coefficient of Variation for Sample 22 0.5% 3.2% 3.4% 6.9% 26 1 77.4 545238 6419 0.016 2 77.2 544048 6582 0.017 3 76.8 532361 6751 0.019 4 76.8 545090 6688 0.018 5 77.0 532565 6204 0.016 6 76.6 529209 6758 0.019 Average for Sample 22 77.0 538085 6567 0.017 Standard Dev for Sample 22 0.3 7454 219 0.001 Coefficient of Variation for Sample 22 0.4% 1.4% 3.3% 7.8% 27 1 80.0 620059 6886 0.015 2 80.5 673533 7054 0.015 3 81.1 661816 7092 0.015 4 80.9 665518 7046 0.015 5 81.2 691196 7058 0.015 6 80.2 640541 6799 0.015 Average for Sample 22 80.6 658777 6989 0.015 Standard Dev for Sample 22 0.5 25120 118 0.000 Coefficient of Variation for Sample 22 0.6% 3.8% 1.7% 2.5% 28 1 77.4 361130 3203 0.010 2 76.7 376812 3409 0.011 3 77.6 376196 3372 0.012 4 77.4 365807 3398 0.013 5 77.4 381155 3434 0.011 6 77.8 398580 3603 0.013 Average for Sample 22 77.4 376613 3403 0.012 Standard Dev for Sample 22 0.4 13114 128 0.001 Coefficient of Variation for Sample 22 0.5% 3.5% 3.8% 11.1% 29 1 79.2 370178 3102 0.011 2 79.0 328677 2958 0.013 3 80.1 362286 3231 0.011 4 78.4 317604 3034 0.013 5 79.5 361432 3210 0.011 6 76.9 339470 3015 0.012 Average for Sample 22 78.8 346608 3092 0.012 Standard Dev for Sample 22 1.1 21142 110 0.001 Coefficient of Variation for Sample 22 1.4% 6.1% 3.6% 8.0% Acknowledgments The authors gratefully appreciate the financial support by Global Fiberglass Solutions Inc. Bothell, WA