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Federal Register / Vol. 86, No. 167 / Wednesday, September 1, 2021 / Proposed Rules
3.8 The test cloth must be clean and must not be used for more than 60 test runs after pre-conditioning as specified in section 5 of this appendix. All test cloth must be permanently marked identifying the lot number of the material. Mixed lots of material must not be used for testing a clothes washer according to appendix J or appendix J2 to this subpart.
4. Equipment Specifications 4.1 Extractor. Use a North Star Engineered Products Inc. formerly Bock Model 215 extractor having a basket diameter of 20 inches, height of 11.5 inches, and volume of 2.09 ft3, with a variable speed drive North Star Engineered Products, P.O.
Box 5127, Toledo, OH 43611 or an equivalent extractor with same basket design i.e., diameter, height, volume, and hole configuration and variable speed drive.
Table 4.1 of this appendix shows the extractor spin speed, in revolutions per minute RPM, that must be used to attain each required g-force level.

TABLE 4.1EXTRACTOR SPIN SPEEDS
FOR EACH TEST CONDITION
g Force 100
200
350
500
650

RPM
594
840
1,111
1,328
1,514

1
1 1
1 1

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4.2 Bone-dryer. The dryer used for drying the cloth to bone-dry must heat the test cloth and energy stuffer cloths above 210 F 99
C.
5. Test Cloth Pre-Conditioning Instructions Use the following instructions for performing pre-conditioning of new energy test cloths and energy stuffer cloths as specified throughout section 7 and section 8
of this appendix, and before any clothes washer testing using appendix J or appendix J2 to this subpart:
Perform five complete wash-rinse-spin cycles, the first two with current AHAM
Standard detergent Formula 3 and the last three without detergent. Place the test cloth in a clothes washer set at the maximum water level. Wash the load for ten minutes in soft water 17 ppm hardness or less using 27.0
grams + 4.0 grams per pound of cloth load of AHAM Standard detergent Formula 3. The wash temperature is to be controlled to 135 F 5 F 57.2 C 2.8 C and the rinse temperature is to be controlled to 60 F 5 F
15.6 C 2.8 C. Dry the load to bone-dry between each of the five wash-rinse-spin cycles. The maximum shrinkage after preconditioning must not be more than 5
percent of the length and width. Measure per AATCC Test Method 1352010 incorporated by reference; see 430.3.
6. Extractor Run Instructions Use the following instructions for performing each of the extractor runs specified throughout section 7 and section 8
of this appendix:
6.1 Test load size. Use a test load size of 8.4 lbs.

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6.2 Measure the average RMC for each sample loads as follows:
6.2.1 Dry the test cloth until it is bone-dry according to the definition in section 2 of this appendix. Record the bone-dry weight of the test load WI.
6.2.2 Prepare the test load for soak by grouping four test cloths into loose bundles.
Create the bundles by hanging four cloths vertically from one corner and loosely wrapping the test cloth onto itself to form the bundle. Bundles should be wrapped loosely to ensure consistency of water extraction.
Then place the bundles into the water to soak. Eight to nine bundles will be formed depending on the test load. The ninth bundle may not equal four cloths but can incorporate energy stuffer cloths to help offset the size difference.
6.2.3 Soak the test load for 20 minutes in 10 gallons of soft <17 ppm water. The entire test load must be submerged. Maintain a water temperature of 100 F 5 F 37.8 C
2.8 C at all times between the start and end of the soak.
6.2.4 Remove the test load and allow each of the test cloth bundles to drain over the water bath for a maximum of 5 seconds.
6.2.5 Manually place the test cloth bundles in the basket of the extractor, distributing them evenly by eye. The draining and loading process must take no longer than 1 minute. Spin the load at a fixed speed corresponding to the intended centripetal acceleration level measured in units of the acceleration of gravity, g 1g for the intended time period 5 seconds. Begin the timer when the extractor meets the required spin speed for each test.
6.2.6 Record the weight of the test load immediately after the completion of the extractor spin cycle WC.
6.2.7 Calculate the remaining moisture content of the test load as WC WI/WI.
6.2.8 Draining the soak tub is not necessary if the water bath is corrected for water level and temperature before the next extraction.
6.2.9 Drying the test load in between extraction runs is not necessary. However, the bone-dry weight must be checked after every 12 extraction runs to make sure the bone-dry weight is within tolerance 8.4 0.1
lbs. Following this, the test load must be soaked and extracted once before continuing with the remaining extraction runs. Perform this extraction at the same spin speed used for the extraction run prior to checking the bone-dry weight, for a time period of 4
minutes. Either warm or cold soak temperature may be used.
7. Test Cloth Material Verification Procedure 7.1 Material Properties Verification. The test cloth manufacturer must supply a certificate of conformance to ensure that the energy test cloth and stuffer cloth samples used for prequalification testing meet the specifications in section 3 of this appendix.
The material properties of one energy test cloth from each of the first, middle, and last rolls must be evaluated as follows, prior to pre-conditioning:
7.1.1 Dimensions. Each hemmed energy test cloth must meet the size specifications in section 3.7.1 of this appendix. Each hemmed
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stuffer cloth must meet the size specifications in section 3.7.2 of this appendix.
7.1.2 Oil repellency. Perform AATCC Test Method 1182007, Oil Repellency:
Hydrocarbon Resistance Test, incorporated by reference, see 430.3, to confirm the absence of ScotchguardTM or other waterrepellent finish. An Oil Repellency Grade of 0 Fails Kaydol is required.
7.1.3 Absorbency. Perform AATCC Test Method 792010, Absorbency of Textiles, incorporated by reference, see 430.3, to confirm the absence of ScotchguardTM or other water-repellent finish. The time to absorb one drop must be on the order of 1
second.
7.2 Uniformity Verification. The uniformity of each test cloth lot must be evaluated as follows.
7.2.1 Pre-conditioning. Pre-condition the energy test cloths and energy stuffer cloths used for uniformity verification, as specified in section 5 of this appendix.
7.2.2 Distribution of samples. Test loads must be comprised of cloth from three different rolls from the sample lot. Each roll from a lot must be marked in the run order that it was made. The three rolls are selected based on the run order such that the first, middle, and last rolls are used. As the rolls are cut into cloth, fabric must be selected from the beginning, middle, and end of the roll to create separate loads from each location, for a total of nine sample loads according to Table 7.2.2.

TABLE 7.2.2DISTRIBUTION OF SAMPLE LOADS FOR PREQUALIFICATION
TESTING
Roll No.
First
Middle
Last

Roll location Beginning.
Middle.
End.
Beginning.
Middle.
End.
Beginning.
Middle.
End.

7.2.3 Measure the remaining moisture content of each of the nine sample test loads, as specified in section 6 of this appendix, using a centripetal acceleration of 350g corresponding to 1111 1 RPM and a spin duration of 15 minutes 5 seconds.
7.2.4 Repeat section 7.2.3 of this appendix an additional two times and calculate the arithmetic average of the three RMC values to determine the average RMC
value for each sample load. It is not necessary to dry the load to bone-dry the load before the second and third replications.
7.2.5 Calculate the coefficient of variation CV of the nine average RMC values from each sample load. The CV must be less than or equal to 1 percent for the test cloth lot to be considered acceptable and to perform the standard extractor RMC testing.
8. RMC Correction Curve Procedure 8.1 Pre-conditioning. Pre-condition the energy test cloths and energy stuffer cloths
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