OIL AND WATER REPEL TEST

1.         INTRODUCTION:

-These tests are intended to assess the amount of oil and water the coating on the fabric can repel.

-Samples for testing should be conditioned to ambient (room) temperature before testing.

2.         TEST REQUIRED – STAIN RELEASE:

This test is similar to AATCC 130 (8).

2.1       Cut a 20cm x 20cm sample for each test required.

2.2       Place test piece flat on a single thickness of new AATCC Textile Blotting Paper on a smooth horizontal surface. Using an eyedropper, place 5 drops (0.2ml total) of Mazola® Corn Oil on the fabric surface creating one single spot. Place 7.6cm x 7.6cm square pieces of glassine paper over the oil puddles. Place 2.27kg (5lb) weights directly over the glassine paper covering the oil puddles. Allow weights to sit undisturbed for 60 seconds, then remove weights and discard glassine paper. Do not allow stained test specimens to contact each other in a manner that would transfer stains.

2.3       Wash within 15 to 60 minutes of staining. Wash in automatic washing powder, in a wascator. Wash setting;

i.           Water level: High

  1. Wash cycle: Normal, 12 min
  2. Temperature: For synthetics, warm water wash (400C), cold rinse. For cotton and blends; hot water (600C), cold rinse. For Advanced Dual Action Teflon® use 400C Wascator program 7A for all fiber types.

2.4       Fill washer with water. Add 100g standard reference detergent WOB. Place specimens in washer with ballast to bring total load up to 4 +/- ¼ lb. At the end of the final spin cycle, place the entire load into an automatic dryer. Dry on high for 45-50 minutes.

2.5       Evaluation: Place test specimen flat in centre of non-glare blacktop table with one edge of table touching a Stain Release Replica. View from a distance of 76cm and compare residual stain of the test specimen to the Stain Release Replica. Rate residual stain on a scale of 1 to 5 to the nearest 0.5 rating by comparison to the Stain Release Replica.

2.6       Durability test: This measures the durability of the stain release finish to home washing by first laundering unstained specimens before running the stain release test. Wash unstained fabric specimens five times continuously for standard stain release and twenty times for Advanced Teflon® fabric protector using regional laundering methods. Then follow steps 1 to 4 to determine stain release performance.

Note – for Advanced Dual Action Teflon® fabric protector – for apparel and bed sheets the requirement is 20 home launderings.

3.       TEST REQUIRED – WETTING:

3.1       Applicable only to Ultra Release Teflon® fabric protector – Dupont Laboratory Method

3.2       Cut a 5cm x 13cm fabric sample. Place the sample fabric face up on white blotting paper on a flat horizontal surface.

Begin by carefully placing a drop of water, approx 5mm in diameter or 0.05ml in volume, on the left side (approx 3cm from the edge of the swatch) and start the stop watch.

3.4       Observe and time how quickly the water drop absorbs into the fabric, up to 3 minutes. Once the drop is completely absorbed into the fabric, stop the stop swatch.

Repeat steps 2 and 3 in the centre and right side of the sample. Look for consistency across the piece of fabric.

1      TEST REQUIRED – COMPARATIVE DRY SOIL TEST METHOD:

            Dupont Laboratory Method

1.1    Cut fabric to be tested into 10cm x 10cm squares. Mark squares to identify them. Weigh the fabric samples.

1.2    Weigh out 5% of Dupont Standard Dry Soil, based on the dry weight of the fabric samples.

1.3    Place the dry soil in a paper bag and add the fabric squares one at a time (no more than six samples in each bag). The paper bag should be approximately 40cm H x 12cm D.

1.4    Shake the bag by hand for 5 minutes, inverting it several times.

1.5    Remove the fabric; shake off the excess soil and hand vacuum up the loose soil. A hand vacuum with a rotating bar should be used.

1.6    Arrange the squares on a flat surface along with an unsoiled square of the same fabric for comparison. Rate the test swatches against the unsoiled fabric on a scale of 1 to 5 by comparison to a grey scale.

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