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Introduction to Medical Absorbent Cotton
2026-01-15
Medical degreased cotton is made from the mature fibers of plants belonging to the Malvaceae family, which are then processed through removal of impurities, degreasing, bleaching, and further refinement to produce medical-grade degreased cotton. Medical degreased cotton is primarily used in hospitals as a dressing material for clinical applications. Additionally, by further processing the degreased cotton, it can be transformed into cotton swabs. The main performance indicators and test methods for medical degreased cotton are as follows:
1. Fluorescent substances: Take a certain amount of this product, spread it evenly to a specified thickness, and examine it under a UV lamp (365 nm). Only faint brownish-purple fluorescence and a few yellow particles are permitted. Except for a few isolated fibers, no strong blue fluorescence should be observed.
2. Acidity and Alkalinity: Take 100 mL of the solution under the “Soluble Substances in Water” section, add 3 drops of phenolphthalein indicator—no pink color should appear. Alternatively, take 100 mL of the filtrate under the “Soluble Substances in Water” section, add 2 drops of bromocresol purple indicator—no yellow color should appear.
3. Soluble Matter in Ether: Take 59 of this product and place it in a 250-mL Soxhlet extractor. Extract continuously with 150 mL of ether for 4 hours, ensuring that the siphon reflux occurs at least 4 times per hour. Evaporate the extract to dryness, then dry at 105°C until constant weight is achieved. The residual residue shall not exceed 0.5%.
4. Water Absorption Time: Take 10 pieces of this product, each measuring 10 cm × 10 cm. Fold each piece in half to form 5 cm × 5 cm, and place them flat on the surface of water in a suitable glass container (the water temperature should be 20 ± 2℃; the gauze around the edges should not touch the container). Within 10 seconds, the pieces should absorb water and sink below the water surface.
5. Water-soluble substances: Take 12.59 of this product, place it in a beaker, add 400 mL of freshly boiled hot water, and heat and boil for 15 minutes. Transfer the aqueous extract into a 500-mL volumetric flask. Wash the filter cloth with freshly boiled hot water, combining the washings with the extract in the volumetric flask. Allow the solution to cool, then dilute to the mark with water, shake well, and filter. Accurately measure 100 mL of the filtrate, evaporate to dryness on a water bath, and dry at 105℃ until constant weight is achieved. The residue left behind shall not exceed 0.5%.
6. Medical absorbent cotton must be processed under sterile conditions and must be free from any odors, stains, or discolorations, ensuring that it remains soft and elastic.
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