The Exchange Test Method
LABORATORY TEST METHOD NO. H-3: DISPERSION- PERSONAL HYGIENE PRODUCTS
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PURPOSE:
To measure the ability of personal hygiene products to allow migration of fluid. The ability of a specimen to let fluid or moisture migrate or disperse within itself is directly related to the user feeling dry. The higher the dispersion value, the better a specimen is.
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PRINCIPLE:
A predetermined amount of solution is poured into the center of a specimen and allowed to travel or disperse within the specimen to determine the amount of dispersion.
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APPARATUS AND MATERIALS:
- 3.1 One 100 by 100 by 25 mm (4 by 4 by 1 in.) lucite cylinder block with a 25 mm (1 in.) diameter opening in the center.
- 3.2 Dyed 1% saline solution at 38°C (100°F).
- 3.3 A measuring cylinder with a capacity of at least 25 ml.
- 3.4 Steel ruler measuring 30 cm (12 in.) in length.
- 3.5 Timer.
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PROCEDURE:
- 4.1 Place lucite block in center of the specimen.
- 4.2 Steadily pour 20 ml of dyed saline solution into the cylinder block and allow the solution to completely enter the cover sheet.
- 4.3 Remove cylinder block and let the specimen stand for two minutes..
- 4.4 After two minutes, remove the top layer of the specimen and expose the embossed fluff/core.
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EVALUATION:
Measure the longest dimensions of the stain in mm. The higher the dispersion value, the better the specimen.
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REPORT
Report the amount of dispersion in mm.